Multiple Choice Questions in Science

Thursday, March 6, 2014

Chapter 1 : INTRODUCTION TO NANOTECHNOLOGY

Choose Appropriate Alternative

10 nm = _____ m
```
[A] 10^-8 [B] 10^-7 [C] 10^-9 [D] 10^-10
```

The size of nanoparticles is between _____ nm.

[A] 100 to 1000 [B] 0.1 to 10 [C] 1 to 100 [D] 0.01 to 1

The diameter of hydrogen atom is...
```
[A] 1 [B] 10 [C] 0.1 [D] 0.01
```
Carbon atoms make ____ type of bond with other carbon atoms.
```
[A] covalent [B] ionic [C] metallic [D] hydrogen
```
Fullerene or bucky ball is made up of ____ carbon atoms.
```
[A] 100 [B] 20 [C] 75 [D] 60
```
The thermal conductivity of a standard SWNT along its length is ____ watt/(m.K)
```
[A] 3500 [B] 385 [C] 35000 [D] 35
```
1 m = _____ nm.
```
[A] 10^-9 [B] 10^-8 [C] 10⁹ [D] 10⁸
```

"There is plenty of room at the bottom." This was stated by _____.

[A] Eric Drexler [B] Richard Feynmann [C] Harold Croto [D] Richard Smalley

Who coined the word 'nanotechnology'?

[A] Eric Drexler [B] Richard Feynmann [C] Sumio Tijima [D] Richard Smalley

According to the definition by CRN, nanotechnology is...

[A] mechanical engineering [B] atomic engineering 
[C] Newtonian mechanics    [D] micro-electronics

Nanoscience can be studied with the help of...

[A] quantum mechanics [B] Newtonian mechanics [C] macro-dynamics [D] geophysics

Greeks and Romans had used nanoparticles in the manufacture of...

[A] cosmetics for eyes [B] medicines [C] metal articles [D] hair-dye

Egyptians were using ____ to prepare make-up for eyes.

[A] nanoaluminium [B] nanocopper [C] nanosteel [D] nanolead

The sword of Tipu Sultan was made of...

[A] nanolead [B] nanoaluminium [C] Damascus steel [D] Pure iron

_____ contains nanoparticles prepared by using biologically processed metal ores.

[A] Homeopathic medicines [B] Modern antibiotics 
[C] Ayurvedic 'Bhasmas'  [D] Modern cosmetics

Who was the first scientist to describe that substances having nanodimensions possess altogether different and unique properties?
```
[A] Richard Feynmann [B] Eric Drexler [C] Archimedes [D] Michael Faraday
```

Which of the following does not apply to nanotechnology?

[A] It is a general-purpose technology.  [B] It can be called Green technology.
[C] Newtonian mechanics can describe it. [D] It involves rearrangement of atoms.

The diameter of human hair is ____ nm.

[A] 50,000 [B] 75,000 [C] 90,000 [D] 1,00,000

The diameter of human hair is ____ m.

[A] 5 x 10^-8 [B] 5 x 10^-7 [C] 5 x 10^-6 [D] 5 x 10^-5

The cut-off limit of human eye is ____ nm.
```
[A] 2,000 [B] 5,000 [C] 10,000 [D] 50,000
```
The size of E.Coli bacteria is ____ nm.
```
[A] 2,000 [B] 5,000 [C] 50 [D] 90
```
The size of RBC is ____ nm.
```
[A] 50 [B] 90 [C] 2,000 [D] 5,000
```
The thickness of a transistor is ____ nm.
```
[A] 50 [B] 90 [C] 2,000 [D] 5,000
```
The size of a virus is ____ nm.
```
[A] 2 [B] 20 [C] 50 [D] 2000
```
The diameter of a bucky ball is ____ nm.
```
[A] 1,000 [B] 100 [C] 10 [D] 1
```
The width of a typical DNA molecule is ____ nm.
```
[A] 1 [B] 2 [C] 5 [D] 10
```
1 micrometer (micron) = ______ m.
```
[A] 10^-9 [B] 10^-8 [C] 10^-7 [D] 10^-6
```
1 micrometer (micron) = ______ nm.
```
[A] 1,000 [B] 100 [C] 10 [D] 0.01
```

The full form of STM is...

[A] Scanning Tunneling Microscope   [B] Scientific Technical Microscope 
[C] Systematic Technical Microscope[D] Super Tensile Microscope

What does 'F' stand for in AFM?
```
[A] Fine [B] Front [C] Force [D] Flux
```

Which ratio decides the efficiency of nanosubstances?

[A] Weight/volume [B] Surface area/volume [C] Volume/weight [D] Pressure/volume

The surface area to volume ratio of a sphere with radius 1 cm is R₁ and that of a sphere with radius 5 cm is R₂. Then R₁ = ____ R₂.
```
[A] 3 [B] 1/3 [C] 5 [D] 1/5
```
The surface area to volume ratio of a cube with side 1 unit is R₁ and that of a cube with side 10 units is R₂. Then R₂ = ____ R₁.
```
[A] 1/10 [B] 10 [C] 1/100 [D] 100
```

The two important properties of nanosubstances are...

[A] pressure and friction     [B] sticking and friction 
[C] sticking and temperature [D] temperature and friction

With the help of _____, Robert F. Curl and others discovered fullerene.

[A] electron microscope     [B] magnetic resonance 
[C] condensation technique [D] mass spectrograph

In the structure of fullerene each carbon atom forms covalent bonds with ____ other carbon atoms.
```
[A] one [B] two [C] three [D] four 
```

Who had invented the famous 'Geodesic' dome structure?

[A] Eric Drexler [B] Buckminster Fuller [C] Richard Smalley [D] Faraday

The largest cluster of carbon atoms in Bucky balls known till today consists of ____ carbon atoms.
```
[A] 60 [B] 75 [C] 180 [D] 540
```
The smallest cluster of carbon atoms in Bucky balls known till today consists of ____ carbon atoms.
```
[A] 75 [B] 60 [C] 20 [D] 15
```

The tensile strength of an MWNT is ____ Pa.

[A] 63 x 10⁶ [B] 63 x 10⁷ [C] 63 x 10⁸ [D] 63 x 10⁹

The compressive strength of a nanotube _____ its tensile strength.

[A] is less than [B] is greater than [C] is equal to [D] may be greater than

The hardness of a standard SWNT is ____ Pa.

[A] 63 x 10⁶ [B] 25 x 10⁶ [C] 25 x 10⁹ [D] 25 x 10^-9

The bulk modulus of a standard SWNT is ____ that of diamond.

[A] less than [B] greater than [C] equal to [D] less than or equal to

How much current can be passed through 1 cm² cross-section of a metal nanotube?
```
[A] 10^-9 A [B] 10⁹ A [C] 1000 A [D] 0.001 A
```
The electrical conductivity of a nanotube is ____ times that of copper.
```
[A] 10 [B] 100 [C] 1000 [D] 1/100
```
An MWNT possesses electrical superconductivity up to temperature of...
```
[A] 12 K [B] 12°C [C] 100 K [D] 100°
```
At room temperature, the thermal conductivity of a copper wire is ____ watt/(m.K).
```
[A] 3500 [B] 350 [C] 385 [D] 38.5
```
In radial direction, the thermal conductivity of a nanotube is ____ watt/(m.K).
```
[A] 3500 [B] 385 [C] 350 [D] 0
```
The thermal stability of a nanotube is seen up to ____ K in vacuum.
```
[A] 100 [B] 1000 [C] 2200 [D] 3100
```
The thermal conductivity of an SWNT along length is ____ watt/(m.K).
```
[A] 35 [B] 350 [C] 385 [D] 3500
```
The size of a quantum dot is ____ nm.
```
[A] 5 [B] 10 [C] 50 [D] 100
```

The wavelength of visible light is ____ nm.

[A] 40-70 [B]  400-700 [C] 4000-7000 [D] 40000-70000

The capacity of a normal human eye to see the smallest object is ____ μm.
```
[A] 10000 [B] 1000 [C] 100 [D] 10
```
The width of a carbon nanotube is ____ nm.
```
[A] 1 [B] 1.3 [C] 2.5 [D] 10
```
The thermal stability of a nanotube is seen up to ____ K in air.
```
[A] 100 [B] 1000 [C] 2000 [D] 3100
```
Nanoparticles of which substance were found on the surface of the sword of Tipu Sultan?
```
[A] Gold [B] Lead [C] Carbon [D] Silicon
```
Nano particles of which atom are used to control collateral damage due to explosion?
```
[A] Copper [B] Aluminium [C] Carbon [D] Lead
```

Who prepared and explained nanotubes for the first time?

[A] Sumio Tijima [B] Richard Smalley [C] Eric Drexler [D] Richard Feynmann

Which of the following statement/s is are true?
1. Volume to surface area ratio is very large for nanomaterials.
2. The cut-off limit of human eye is 10^-5 m.
3. Hardness of a SWNT is about 63 x 10⁹ Pa.
4. Carbon nanotubes are cylindrical fullerenes.
```
[A] All four [B] (ii) and (iv) [C] (i), (ii) and (iv) [D] (ii), (iii) and (iv)
```

Match the objects in Part A with their size in Part B.

[A] 1-a, 2-c, 3-d, 4-b [B] 1-b, 2-a, 3-c, 4-d
[C] 1-a, 2-d, 3-b, 4-c [D] 1-c, 2-d, 3-b, 4-a

Match the items in Part A with appropriate alternative in Part B.

[A] 1-c, 2-d, 3-a [B] 1-c, 2-b, 3-a [C] 1-c, 2-a, 3-b [D] 1-a, 2-b, 3-d

The suffix '-ene' in the name of fullerene shows the presence of _____ in the molecule.
```
[A] one triple bond [B] one double bond [C] two single bonds [D] two triple bonds
```

ANSWERS

(1) A (2) C (3) C (4) A (5) D (6) A (7) C (8) B (9) A (10) B (11) A (12) D (13) D (14) C (15) C (16) D (17) C (18) A (19) D (20) C (21) A (22) D (23) B (24) C (25) D (26) B (27) D (28) A (29) A (30) C (31) B (32) C (33) A (34) B (35) D (36) C (37) B (38) D (39) C (40) D (41) A (42) C (43) B (44) B (45) C (46) A (47) C (48) D (49) D (50) D (51) A (52) B (53) D (54) B (55) B (56) C (57) B (58) A (59) D (60) C (61) C (62) B

Saturday, March 1, 2014

Chapter 2 : LIGHT : REFLECTION AND REFRACTION

Choose Appropriate Alternative

What is the range of wavelength of visible light?

[A] 4 x 10^-7 to 8 x 10^-7 m [B] 4 x 10^-9 to 8 x 10^-9 m 
[C] 4 x 10^-5 to 8 x 10^-5 m [D] 4 x 10^-6 to 8 x 10^-6 m

For the spherical mirror, what is the relation between radius of curvature (R) and focal length (f)?
```
[A] R = f/2 [B] R = f [C] R = 2f [D] R = 3f
```
Which type of reflection is represented by the light reflected from a book?
```
[A] Regular [B] Irregular [C] Both types [D] None
```
Through which point, a ray passing through the centre of curvature and reflected by a concave mirror will pass through?
```
[A] Focus [B] Centre of curvature [C] Pole [D] All
```

At what distance in front of a concave mirror should an object be placed to get its virtual and erect image?

[A] At the centre of curvature [B] Beyond the centre of curvature
[C] Between focus and pole     [D] At focus

For a plane mirror, the magnification is always...
```
[A] > 1 [B] < 1 [C] 1 [D] 0
```

The focal length of a plane mirror is...

[A] zero [B] infinite [C] uncertain [D] equal to the object distance

The distance between the object at 2 m from a plane mirror and its image is...
```
[A] 4 m [B] 1 m [C] 2 m [D] 3 m
```

At what distance should an object be placed to obtain its real, inverted and same-sized image by a convex lens?

[A] At focus               [B] Between focus and centre of curvature
[C] At centre of curvature [D] Between optical centre and focus

Which of the following materials has maximum optical density?
```
[A] Glass [B] Water [C] Pearl [D] Diamond
```
The absolute refractive index of any medium is always...
```
[A] 1 [B] > 1 [C] < 1 [D] zero
```
Which of the lenses with focal length 10 cm, 20 cm, 25 cm and 50 cm has maximum power?
```
[A] 50 cm [B] 25 cm [C] 20 cm [D] 10 cm
```
What is the focal length of a convex lens having power +5.0?
```
[A] -10 cm [B] -20 cm [C] +10 cm [D] + 20 cm
```
If the absolute refractive indices of water, benzene and sapphire are 1.33, 1.50 and 1.77, respectively, then which medium has maximum relative refractive index?
```
[A] Sapphire relative to water [B] Sapphire relative to benzene 
[C] Benzene relative to water  [D] Water relative to benzene
```

Which type of image is formed by a plane mirror?

[A] Real, inverted [B] Real, erect [C] Virtual, erect [D] Virtual, inverted

If the absolute refractive indices of water and glass are 4/3 and 3/2, respectively, then what will be the ratio of velocity of light in water to that in glass?
```
[A] 2 [B] 8/9 [C] 9/8 [D] 1/2
```
If the absolute refractive indices of water, glass and diamond are 1.33, 1.50 and 2.42, respectively, then which medium is optically densest?
```
[A] Water [B] Glass [C] Diamond [D] None
```

Which of the following always form virtual image?

[A] Concave mirror and convex lens [B] Convex mirror and concave lens
[C] Convex mirror and convex lens [D] Concave mirror and concave lens

What will be the angle of refraction for a light ray incident normal to the surface?
```
[A] 90 [B] 60 [C] 30 [D] 0
```

A compound microscope consists of two convex lenses of focal length 5 cm and 20 cm. Which of them will be objective lens and eye piece?

[A] Objective lens - f = 20 cm, eye piece - f = 5 cm
[B] Objective lens - f = 5 cm, eye piece - f = 20 cm 
[C] Objective lens - f = 20 cm, eye piece - f = 20 cm 
[D] Objective lens - f = 5 cm, eye piece - f = 5 cm

The speed of light in vacuum is ____ m/s.

[A] 3 x 10⁵ [B] 3 x 10⁶ [C] 3 x 10⁷ [D] 3 x 10⁸

Which of the following is not true for light rays?

[A] They travel in straight line. [B] They do not need a medium for propagation.
[C] They are mechanical waves.   [D] They create sensation in our eyes.

We can see objects clearly due to _____ of light.

[A] refraction [B] regular reflection [C] irregular reflection [D] diffraction

If a ray of light is incident on a surface makes an angle of measure 40° with the surface, then its angle of reflection is of measure...
```
[A] 40° [B] 50° [C] 80° [D] 20°
```
If the angle of incidence of a ray of light is 40°, the measure of the angle between the incident ray and the reflected ray is...
```
[A] 40° [B] 50° [C] 80° [D] 20°
```

The image formed by a plane mirror is...

[A] real [B] real and erect [C] real and of same size [D] laterally inverted

If the distance between Paresh and his image formed by a plane mirror is 3 m, then the distance between Paresh and the mirror is...
```
[A] 1.5 m [B] 3 m [C] 6 m [D] 1/3 m
```
The centre of the reflecting surface of a spherical mirror is called its...
```
[A] pole [B] focus [C] aperture [D] centre of curvature
```

If a ray of light incident on a concave mirror is parallel to the principal axis, then after reflection it will...

[A] travel parallel to the principal axis [B] pass through the focus
[C] pass through the centre of curvature [D] pass through the pole

If a ray of light incident on a concave mirror passes through C, then after reflection it will...

[A] pass through F        [B] pass through the pole 
[C] pass through C again [D] become parallel to the principal axis

If an object is placed at infinite distance in front of a concave mirror, its image is formed...
```
[A] at infinite distance [B] at F [C] at C [D] between F and C
```
If an object is placed at a finite distance beyond C in front of a concave mirror, its image is formed...
```
[A] at C [B] between F and C [C] at F [D] between F and pole
```

If an object is placed at a finite distance beyond C in front of a concave mirror, its image is...

[A] real and enlarged       [B] real and of the same height as the object
[C] virtual and diminished  [D] real and diminished

If an object is placed at C in front of a concave mirror, its image is formed...
```
[A] at F [B] between F and C [C] at C [D] beyond C
```

If an object is placed at C in front of a concave mirror, its image is...

[A] real and of the same height as the object [B] real and diminished 
[C] real and enlarged                         [D] virtual and enlarged

If an object is placed between C and F in front of a concave mirror, its image is formed...
```
[A] beyond C [B] between C and F [C] at C [D] at F
```

If an object is placed between C and F in front of a concave mirror, its image is...

[A] real and diminished    [B] real and enlarged 
[C] virtual and diminished [D] virtual and enlarged

If an object is placed at F in front of a concave mirror, its image is formed...
```
[A] at F [B] at C [C] between F and C [D] at infinite distance
```
If an object is placed between F and pole of a concave mirror, its image is formed...
```
[A] beyond C [B] at infinity [C] between F and C [D] behind the mirror
```

If an object is placed between F and pole of a concave mirror, its image is...

[A] real  and enlarged        [B] virtual and enlarged 
[C] real and diminished [D] virtual and diminished

The image formed by a convex mirror is always...

[A] real and enlarged     [B] real and diminished
[C] virtual and enlarged [D] virtual and diminished

If an object is placed at a finite distance from a convex mirror, its image is formed...

[A] beyond C         [B] between F and C 
[C] between F and P [D] anywhere depending on object distance

If an object placed in front of a convex mirror is moved towards the mirror, its image will move...
```
[A] away from P towards F [B] away from F towards P
[C] away from F towards C [D] beyond C
```

In Cartesian sign convention for spherical mirrors, the origin is taken at...

[A] pole of the mirror      [B] focus of the mirror 
[C] its centre of curvature[D] at the point where object is placed

Using standard symbols, which of the following is mirror formula?

[A] (1/v) - (1/u) = (1/f) [B] (1/v) + (1/f) = (1/u) 
[C] (u + v)/uv = (2/R)   [D] (u + v)/uv = (R/2)

The magnification by a convex mirror is always...

[A] 1 [B] less than 1 [C] greater than 1 [D] negative

The magnification by a concave mirror is (-1) when the object is placed...
```
[A] at F [B] between C and F [C] at C [D] beyond C
```
If an object is placed between F and pole of a concave mirror, its magnification is...
```
[A] > 1, positive [B] > 1, negative [C] < 1, positive [D] < 1, negative
```
If the image formed by a concave mirror is real and enlarged, its magnification can be...
```
[A] + 0.5 [B] - 0.5 [C] + 5.0 [D] - 5.0
```

During refraction of light through a rectangular glass slab, the lateral shift does not depend on...

[A] angle of incidence                             [B] refractive index of the medium 
[C] perpendicular distance between refractive surfaces of the slab [D] thickness of slab

If an object is placed beyond 2F₁ of a convex lens, its image is formed...

[A] beyond 2F₂ [B] between F₂ and 2F₂ [C] at 2F₂ [D] between F₂ and O

If an object is placed between F and 2F of a convex lens, its image is...

[A] real, diminished [B] virtual, diminished [C] real, enlarged [D] virtual, enlarged

If the image of an object formed by a convex lens is virtual, then...

[A] the object is between F and 2F [B] the object is at 2F
[C] the image is diminished        [D] the image is enlarged

The image of an object placed at a finite distance in front of a concave lens is...

[A] always real [B] always virtual [C] always enlarged [D] always virtual and enlarged

The magnification of a concave lens is always...

[A] < 1, positive [B] < 1, negative [C] > 1, positive [D] > 1, negative

The SI unit of power of lens is...
```
[A] meter [B] dioptre [C] cm [D] hertz
```
Which of the following cannot be the power of a convex lens?
```
[A] 2.0 D [B] 0.5 D [C] 1.0 D [D] -0.75 D
```
The power of a lens is + 2.5 D, then its focal length is_____ m.
```
[A] 0.4 [B] 4.0 [C] 2.5 [D] 0.25
```
The power of a concave lens with focal length 25 cm is...
```
[A] -4.0 D [B] +4.0 D [C] -0.04 D [D] +0.04 D
```

A simple microscope uses...

[A] one concave lens [B] two concave lenses [C] one convex lens [D] two convex lenses

A compound microscope consists of...

[A] a convex lens and a concave lens [B] two concave lenses
[C] two convex lenses                [D] only one convex lens

The image formed by a compound microscope is...

[A] real and enlarged    [B] real and diminished
[C] virtual and enlarged [D] virtual and diminished

The image formed by an astronomical telescope is...

[A] real and enlarged    [B] real and diminished
[C] virtual and enlarged [D] virtual and diminished

Which of the following can focus the rays of light?

[A] Convex mirror [B] Concave lens [C] Convex lens [D] Plane mirror

The rays of a parallel beam of light do not remain parallel after reflection from...

[A] plane mirror [B] convex mirror [C] concave mirror [D] irregular reflecting surface

If θ_i and θ_r denote angle of incidence and angle of reflection, respectively, then...
```
[A] θ_i > θ_r [B] θ_i < θ_r [C] θ_i = θ_r [D] θ_r = 90°
```
If θ_i and θ_r denote angle of incidence and angle of refraction, respectively, then...
```
[A] θ_i > θ_r [B] θ_i < θ_r [C] θ_i = θ_r [D] θ_i ≠ θ_r
```

The distance between the centre of curvature and the pole of a mirror is...

[A] focal length [B] radius of curvature [C] object distance [D] image distance

The distance between the principal focus and the centre of curvature of a mirror is equal to...
```
[A] radius of curvature [B] focal length [C] aperture [D] distance between object and image
```

Which of the following is not a part of a spherical mirror?

[A] Pole [B] Centre of curvature [C] Curved surface [D] Aperture

The distance between the principal focus and the pole of a mirror is half of the...

[A] radius of curvature [B] focal length [C] aperture [D] distance between object and image

A virtual and enlarged image is formed by a concave mirror when distance of the object is...

[A] equal to focal length  [B] greater than focal length
[C] less than focal length [D] equal to radius of curvature

Which of the following conditions is to be satisfied to obtain a magnified image of an object by a concave mirror?
```
[A] v > u [B] v < u [C] v = u [D] v = f
```
Which of the following conditions is to be satisfied to obtain a virtual image of an object by a concave mirror?
```
[A] u > f [B] u < f [C] u = f [D] u = 2f
```

According to Cartesian sign convention, ______ is always considered negative.

[A] focal length [B] radius of curvature [C] object distance [D] image distance

In which of the following pairs of mediums, light has almost same speed?
```
[A] Air, water [B] Water, glass [C] Air, vacuum [D] Glass, diamond
```

Which of the following may have magnification equal to -1?

[A] Concave mirror, Convex lens  [B] Convex mirror, convex lens 
[C] Concave mirror, concave lens [D] Convex mirror, concave lens

Which of the following may form a real, inverted and magnified image?

[A] Concave mirror, Convex lens  [B] Convex mirror, convex lens 
[C] Concave mirror, concave lens [D] Convex mirror, concave lens

When an object is placed at a distance of 12 cm from a concave mirror, its image is formed at a distance of 24 cm. What will be the magnification?
```
[A] +0.5 [B] -0.5 [C] +2.0 [D] -2.0
```

Which of the following may have magnification equal to +0.5?

[A] Convex mirror [B] Concave mirror [C] Convex lens [D] Plane mirror

Which of the following may have magnification equal to -0.5?

[A] Convex mirror [B] Concave lens [C] Convex lens [D] Plane mirror

Which of the following rectangular glass slabs made from same material produces the largest lateral shift when a ray of light is incident at the same angle?
```
[A] 15 cm x 9 cm [B] 15 cm x 10 cm [C] 15 cm x 11 cm [D] 15 cm x 12 cm
```

If the focal length of a lens is doubled, the power of lens...

[A] is halved [B] is doubled [C] remains same [D] becomes four times

What will be the distance between the principal focus and the centre of curvature of a convex lens having radius of curvature equal to 50 cm?
```
[A]  20 cm [B] 25 cm [C] 50 cm [D] 100 cm
```
What will be the distance between the principal focus and the centre of curvature of a convex lens having focal length equal to 50 cm?
```
[A]  20 cm [B] 25 cm [C] 50 cm [D] 100 cm
```

_____ converge parallel light rays incident upon them.

[A] Concave mirror, Convex lens  [B] Convex mirror, convex lens 
[C] Concave mirror, concave lens [D] Convex mirror, concave lens

Which of the following statement(s) is(are) not true?
1. The speed of light in vacuum is 3 x 10⁵ km/s.
2. The real image is always inverted.
3. Magnification of plane mirror is +1 or -1
4. Image formed by a concave lens is always diminished and real.
```
[A] (ii) [B] (iii) and (iv) [C] (ii) and (iv) [D] (i), (iii) and (iv)
```

Absolute refractive index of a medium is always greater than 1 because...

[A] Velocity of light in vacuum is greater than that in the medium.
[B] Velocity of light in vacuum is smaller than that in the medium.
[C] All other mediums are optically rarer than vacuum.
[D] Velocity of light in vacuum is always constant.

If the dioptre of a lens is doubled, its power will...

[A] become half [B] double [C] become four times [D] not change

Match items in Part A with appropriate statement in Part B.

[A] 1-b, 2-d, 3-c, 4-a [B] 1-c, 2-b, 3-d, 4-a
[C] 1-c, 2-d, 3-b, 4-a [D] 1-d, 2-c, 3-a, 4-b

Match the position of object in Part A with appropriate position of image in Part B.

[A] 1-b, 2-a, 3-d, 4-c [B] 1-a, 2-d, 3-b, 4-c
[C] 1-a, 2-c, 3-b, 4-d [D] 1-b, 2-d, 3-a, 4-c

Match appropriate pairs from Part A (magnification) and Part B (type of mirror/lens)

[A] 1-b, 2-c, 3-a, 4-d [B] 1-d, 2-a, 3-b, 4-c
[C] 1-b, 2-d, 3-c, 4-a [D] 1-a, 2-c, 3-d, 4-b

A parallel beam of light does not remain parallel after reflection from a ...

[A] plane mirror [B] concave mirror [C] convex mirror [D] irregular reflecting surface

_____ is the midpoint between the pole and the centre of curvature along the principal axis...
```
[A] Principal focus [B] Focal length [C] u [D] v
```
A convex lens forms a real, inverted and same sized image as the object placed at a distance of 40 cm from it. The power of the lens is _____D.
```
[A] +20 [B] -20 [C] +5 [D] -5
```
```
[A][B][C][D]
```

ANSWERS

(1) A (2) C (3) B (4) B (5) C (6) C (7) B (8) A (9) C (10) D (11) B (12) D (13) D (14) A (15) C (16) B (17) C (18) B (19) D (20) B (21) D (22) C (23) C (24) B (25) C (26) D (27) A (28) A (29) B (30) C (31) B (32) B (33) D (34) C (35) A (36) A (37) B (38) D (39) D (40) B (41) D (42) C (43) B (44) A (45) C (46) B (47) C (48) A (49) D (50) D (51) B (52) C (53) D (54) B (55) A (56) B (57) D (58) A (59) A (60) C (61) C (62) C (63) D (64) C (65) D (66) C (67) D (68) B (69) B (70) B (71) A (72) C (73) A (74) B (75) C (76) C (77) A (78) A (79) D (80) A (81) C (82) D (83) A (84) B (85) C (86) A (87) B (88) A (89) B (90) B (91) B (92) B (93) D (94) A (95) C

Friday, February 21, 2014

Chapter 3 : DISPERSION OF LIGHT AND NATURAL OPTICAL PHENOMENA

CHOOSE APPROPRIATE ALTERNATIVE

By which optical phenomenon does the splitting of white light into seven constituent colours occur?
```
[A] Refraction [B] Reflection [C] Dispersion [D] Interference
```
Which colour of light deviates maximum in the dispersion of white light by prism?
```
[A] Violet [B] Blue [C] Green [D] Red
```

Which of the following are the primary colours of light?

[A] Red, Blue, Yellow [B] Red, Green, Violet [C] Yellow, Green, Blue [D] Red, Green, Blue

Which of the following are primary pigments?

[A] Yellow, Green, Magenta [B] Magenta, Yellow, Cyan 
[C] Blue, Green, Violet   [D] Red, Green, Yellow

In human eye, the image of an object is formed at...
```
[A] iris [B] pupil [C] retina [D] cornea
```
Which is the complimentary colour of blue?
```
[A] Red [B] Yellow [C] Green [D] Magenta
```
Which colour is obtained by mixing blue and red colours of light?
```
[A] Green [B] Magenta [C] Cyan [D] Yellow
```
The focal length of the eye lens changes due to the action of...
```
[A] pupil [B] retina [C] ciliary muscles [D] cornea
```

Which colours are reflected when white light is incident on blue pigment?

[A] Yellow, Orange, Green [B] Violet, Green, Blue 
[C] Violet, Yellow, Green [D] Yellow, Green, Blue

_____ lens is used to correct the defect of vision termed as presbyopia.
```
[A] Convex [B] Concave [C] Bifocal [D] Contact
```
Which phenomenon does not play role in the formation of rainbow?
```
[A] Reflection [B] Refraction [C] Dispersion [D] Absorption
```

For which of the following cases will the total internal reflection of light be possible?

[A] Angle of incidence is less than the critical angle.
[B] Angle of incidence is equal to the critical angle.
[C] Angle of incidence is greater than the critical angle.
[D] Angle of incidence is equal to the angle of refraction.

Where is the image in eye formed for a person sufferring from the defect of near-sightedness?
```
[A] On retina [B] Behind retina [C] Ahead of retina [D] On pupil
```

Which phenomenon is responsible for the twinkling of stars?

[A] Atmospheric reflection [B] Atmospheric refraction 
[C] Reflection             [D] Total internal reflection

Due to which phenomenon of light does Tyndall effect occur?

[A] Reflection [B] Refraction [C] Scattering [D] Dispersion

What is the time difference between actual sunset and apparent sunset?
```
[A] 2 sec [B] 20 sec [C] 2 min [D] 20 min
```
Which colour of light scatters maximum due to atmosphere?
```
[A] Blue [B] Yellow [C] Green [D] Red
```
Which colour of light has the minimum velocity in the glass prism?
```
[A] Red [B] Green [C] Blue [D] Violet
```

When white light is incident on a green leaf...

[A] only green colour is absorbed [B] only green colour is reflected
[C] all other colours are reflected [D] the leaf appears black

When light of red colour is incident on a green leaf, the leaf appears...
```
[A] red [B] green [C] white [D] black
```

When light of red colour is incident on a green leaf...

[A] green colour is reflected                 [B] red colour is reflected 
[C] both red and green colours are reflected [D] red colour is absorbed

Red + Blue = _____

[A] Magenta [B] Cyan [C] Yellow [D] Green

Blue + Green = _____

[A] Magenta [B] Cyan [C] Yellow [D] Violet

Red + Cyan = _____

[A] Magenta [B] Yellow [C] Green [D] White

Red + Blue + Green = ______

[A] White [B] Violet [C] Indigo [D] Orange

The complimentary colour of yellow is...
```
[A] White [B] Green [C] Blue [D] Red
```

Which of the following is a pair of complimentary colours?

[A] Red and Blue [B] Cyan and Magenta [C] Magenta and Green [D] White and yellow

Primary pigments are...

[A] Red, Blue, Green      [B] Yellow, Blue, Violet
[C] Cyan, Magenta, Yellow [D] Cyan, Green, Orange

Pigments are mixed by... mixing.

[A] additive [B] subtractive [C] multiplicative [D] complimentary

The muscular diaphragm behind the cornea of the eye is called...
```
[A] pupil [B] iris [C] ciliary muscle [D] retina
```
The amount of light entering the eye is controlled by...
```
[A] pupil [B] iris [C] eye lens [D] cornea
```

Which of the following statements is true?

[A] Pupil controls the amount of light entering the eye.
[B] Pupil helps in changing the focal length of the eye lens.
[C] Cornea controls the size of the pupil.
[D] Ciliary muscles change the size of the retina.

For a person with normal vision, the near point of the eye is a point at a distance of ____ from the eye.
```
[A] 25 cm [B] 50 cm [C] 1 m [D] infinity
```
The near point of an eye is 25 cm. This means that a person can clearly see the object at a distance...
```
[A] upto 25 cm [B] 25 cm [C] beyond 25 cm [D] 25 cm and beyond
```

The defect of near-sightedness is corrected by using _____ of suitable power.

[A] concave lens [B] convex lens [C] combination of concave and convex lenses [D] biconvex lens

The defect of far-sightedness (hypermetropia) is corrected by using _____ of suitable power.

[A] concave lens [B] convex lens [C] combination of concave and convex lenses [D] biconcave lens

Which of the following defects is the result of ageing of a person?
```
[A] Myopia [B] Hypermetropia [C] Presbyopia [D] Colour blindness
```
The milky or cloudy layer formed on the eye lens of a person is called...
```
[A] iris [B] cataract [C] glucoma [D] presbyopia
```
The deflection of light by minute particles and molecules in all direction is called _____ of light.
```
[A] dispersion [B] interference [C] diffraction [D] scattering
```

Very minute particles present in atmosphere scatter the light of...

[A] smaller wavelength [B] medium wavelength [C] larger wavelength [D] all wavelengths

Bigger size particles present in atmosphere scatter the light of...

[A] smaller wavelength [B] medium wavelength [C] larger wavelength [D] only blue colour

Sometimes the smoke emitted by the combustion of oil appears blue due to...

[A] refraction [B] total internal reflection [C] Tyndall effect [D] dispersion

The wavelength of red coloured light is about ____ times that of the blue coloured light.
```
[A] 1.25 [B] 1.5 [C] 1.8 [D] 2.5
```
Sun appears _____ when it is near horizon.
```
[A] red [B] blue [C] white [D] pale blue
```

When a ray of light travels from an optically denser medium to an optically rarer medium...

[A] it moves towards the normal [B] it moves away from the normal 
[C] it is not refracted        [D] it is reflected back in the denser medium

Which of the following is not due to total internal reflection?

[A] Sparkling of diamond [B] Mirage [C] Looming [D] Twinkling of stars

When total internal reflection occurs...

[A] the angle of incidence is greater than 90°.
[B] the angle of incidence is greater than the angle of refraction.
[C] the angle of refraction is greater than 90°.
[D] the angle of incidence is equal to 90°.

Arranging in the ascending order of wavelength, which one is true?

[A] Blue, Green, Red    [B] Orange, Green, Red 
[C] Blue, Yellow, Green [D] Orange, Yellow, Green

The velocity of waves of all colours is same in...
```
[A] water [B] air [C] vacuum [D] glass
```
Total internal reflection will occur if the angle of refraction is...
```
[A] 45° [B] 60° [C] 90° [D] 99°
```
Which colour of light deviates minimum in the dispersion of white light by prism?
```
[A] Violet [B] Blue [C] Green [D] Red
```
Which of the following colours of white light deviates minimum in the dispersion of white light by prism?
```
[A] Green [B] Indigo [C] Yellow [D] Orange
```

Which colours of light are reflected from blue pigment when white light is incident on it?

[A] Yellow, Orange, Green [B] Violet, Green, Blue
[C] Violet, Yellow, Green [D] Violet, Yellow, Blue

Which colours of light are reflected from yellow pigment when white light is incident on it?

[A] Yellow, Orange, Green [B] Violet, Green, Blue
[C] Violet, Yellow, Green [D] Violet, Yellow, Blue

Which colour of light is reflected from the mixture of yellow and blue pigments when white light is incident on it?
```
[A] Yellow [B] Green [C] Blue [D] Violet
```
The accommodation power of the eye is accomplished by the action of...
```
[A] cornea [B] pupil [C] retina [D] ciliary muscles
```

Which optical phenomenon is responsible for twinkling of stars?

[A] Atmospheric refraction    [B] Atmospheric reflection 
[C] Total internal reflection [D] Dispersion

The time duration between apparent sunrise and apparent sunset is ____ than that between actual sunrise and actual sunset.
```
[A] 2 minutes less [B] 2 minutes more [C] 4 minutes less [D] 4 minutes more
```
The sparkling of diamond and the signal communication through optical fibres is due to...
```
[A] refraction [B] scattering [C] total internal reflection [D] dispersion
```

Red + Cyan = _____.

[A] Green + Blue [B] Blue + Red [C] Green + Magenta [D] Green + Yellow

In the following, the Part A shows different optical phenomena and Part B shows the reasons for those phenomena. Match appropriate pairs.
```
[A] 1-b, 2-c, 3-a, 4-d [B] 1-d, 2-a, 3-b, 4-c
[C] 1-b, 2-d, 3-c, 4-a [D] 1-a, 2-c, 3-d, 4-b
```

Match the defects of vision in Part A with appropriate remedy in Part B.

[A] 1-b, 2-a, 3-d, 4-c [B] 1-d, 2-b, 3-a, 4-c
[C] 1-a, 2-c, 3-d, 4-b [D] 1-c, 2-a, 3-d, 4-b

Match the colour in Part A with its complimentary colour in Part B.

[A] 1-a, 2-c, 3-d [B] 1-c, 2-a, 3-d [C] 1-b, 2-c, 3-a [D] 1-d, 2-b, 3-a

Had there been no atmosphere, the sky would have appeared...
```
[A] red [B] blue [C] white [D] dark
```
```
[A][B][C][D]
```

ANSWERS

(1) C (2) A (3) D (4) B (5) C (6) B (7) B (8) C (9) B (10) C (11) D (12) C (13) C (14) B (15) C (16) C (17) A (18) D (19) B (20) D (21) D (22) A (23) B (24) D (25) A (26) C (27) C (28) C (29) B (30) B (31) A (32) A (33) A (34) D (35) A (36) B (37) C (38) B (39) D (40) A (41) C (42) C (43) C (44) A (45) B (46) D (47) C (48) A (49) C (50) D (51) D (52) D (53) B (54) A (55) B (56) D (57) A (58) D (59) C (60) C (61) B (62) D (63) A (64) D

Tuesday, January 7, 2014

Chapter 4 : ELECTRICITY

Choose Appropriate Alternative

The SI unit of electric charge is...

[A] ampere [B] volt [C] watt [D] coulomb

How many electrons will be there in 1.6 C charge?
```
[A] 10¹⁷ [B] 10¹⁸ [C] 10¹⁹ [D] 10²⁰
```
1 μA = ______ mA.
```
[A] 10^-16[B] 10^-3 [C] 10³ [D] 10⁶
```
Which of the following materials has more number of free electrons?
```
[A] Copper [B] Glass [C] Rubber [D] Iron
```

According to Ohm's law...

[A] The resistance increases with the increase in current. 
[B] The resistance increases with the increase in voltage.
[C] The current increases with the increase in voltage. 
[D] The resistance and current both increase with the increase in voltage.

The formula for electric current is...

[A] I = Q.t [B] I = Q/t [C] I = t/Q [D] I = W.t

2 A current is passed through a conducting wire for 1 min. How much charge will flow through the wire?
```
[A] 2 C [B] 30 C [C] 60 C [D] 120 C
```
In an electrical appliance, current of 4.8 A is passed. The number of electrons passing through it in 1 sec will be...
```
[A] 0.33 x 10¹⁹ [B] 3.3 x 10¹⁹ [C] 3 x 10¹⁹ [D] 4.8 x 10¹⁹
```

Which of the following formulas represents voltage?

[A] Work/(current.time)      [B] Work.time/current 
[C] (Work).(electric charge) [D] (Work).(electric charge).(time)

The unit of electrical potential difference is...
```
[A] J [B] J/C [C] J.C [D] C/J
```
If the work done to move 3 C electric charge from one point to another point is 15 J, what will be the potential difference between these points?
```
[A] 3 V [B] 15 V [C] 5 V [D] 45 V
```
The resistance of a conducting wire is 10 Ω. How much electric current will flow by connecting it with a battery of 1.5 V?
```
[A] 0.15 mA [B] 1.5 mA [C] 15 mA [D] 150 mA
```

On which factors does the resistivity of a conducting wire depend?

[A] Length of wire [B] Cross-sectional area of wire 
[C] Volume of wire [D] Material of wire

If 5 equal pieces are made from a wire having resistance 5 Ω and then each piece is connected in parallel to others, then their equivalent resistance will be...
```
[A] 1/5 Ω [B] 1 Ω [C] 5 Ω [D] 25Ω 
```
The unit of resistivity is...
```
[A] Ω [B] Ω.m [C] Ω/m [D] m/Ω
```
What will be the equivalent resistance between points A and B of the following circuit?
```
[A] 1 Ω [B] 2 Ω [C] 5 Ω [D] 10 Ω
```
What will be the equivalent resistance between points A and B of the following circuit?
```
[A] 4 Ω [B] 8 Ω [C] 2 Ω [D] ⒠
```
What will be the equivalent resistance between points A and B of the following circuit?
```
[A] 2.5 Ω [B] 5 Ω [C] 12.5 Ω [D] 20 Ω
```

Which physical quantity has the unit kWh?

[A] Work [B] Electric power [C] Electric current [D] Electric potential

1 kWh = _____ joule.

[A] 3.6 x 10⁶ [B] 3.6 x 10³ [C] 3.6 x 10^-6 [D] 3.6 x 10^-3

An electric heater consumes 1.1 kW power when 220V voltage is applied to it. How much current will flow through it?
```
[A] 1.1 A [B] 2.2 A [C] 4 A [D] 5 A
```

What makes electric current flow through a solution?

[A] Only free electrons [B] Only positive ions 
[C] Only negative ions [D] Positive and negative ions

The distilled water acts as _____ for the electricity.

[A] conductor [B] insulator [C] semiconductor [D] none

The magnitude of electric force between the charges can be calculated using the law devised by...
```
[A] Coulomb [B] Ohm [C] Maxwell [D] Ampere
```

Free electrons are...

[A] in the first orbit [B] in any orbit 
[C] valence electrons [D] on the surface of the conductor

_____ discovered electrons.

[A] Ampere [B] Faraday [C] Thomson [D] Coulomb

1 mA = _____ A.
```
[A] 10 [B] 10^-1[C] 10^-2[D] 10^-3
```

In Volta's cell...

[A] electrical energy is converted to thermal energy.
[B] thermal energy is converted to electrical energy.
[C] chemical energy is converted to electrical energy.
[D] electrical energy is converted to chemical energy.

In Volta's cell _____ plate acts as cathode.

[A] copper [B] graphite [C] zinc [D] aluminium

The SI unit of resistance is...

[A] coulomb/sec [B] volt/ampere [C] ampere/volt [D] volt/joule

Which of the following has maximum resistivity?

[A] Tungsten [B] Nichrome [C] Aluminium [D] Diamond

Which of the following is a semiconductor?

[A] Germanium [B] Diamond [C] Graphite [D] Nichrome

The chemical equivalent of an atom is the ratio of...

[A] atomic mass to atomic radius [B] atomic radius to atomic mass 
[C] atomic mass to valency      [D] valency to atomic mass

Work done on an electric charge is stored in it as...

[A] potential energy [B] kinetic energy [C] thermal energy [D] nuclear energy

_____ is not essential to obtain electric current.

[A] Free electrons [B] Potential difference [C] Electric circuit [D] Potential

Who invented the simple electrochemical cell?
```
[A] Faraday [B] Edison [C] Volta [D] Coulomb
```

When resistors are connected in series...

[A] voltage drop is uniform               [B] current is uniform 
[C] voltage drop and current are uniform [D] neither of the two is uniform

When resistors are connected in parallel...

[A] voltage drop is uniform               [B] current is uniform 
[C] voltage drop and current are uniform [D] neither of the two is uniform

The equivalent resistance of three resistors of 6Ω, 12Ω and 12Ω connected in parallel is...
```
[A] 6Ω [B] 12Ω [C] 3Ω [D] 1/3Ω
```
Which of the following is not correct for electric work(W)?
```
[A] W = V.Q [B] W = V.I.t [C] W = I²Rt [D] W = I²RQ
```

_____ is not a unit of energy.

[A] joule [B] watt [C] watt.second [D] kWh

1 joule = ______.

[A] 1 watt.second [B] 1 watt/sec [C] 1 coulomb/sec [D] 1 unit

Which of the following is not correct?

[A] P = W/t [B] P = I²R [C] P = W.I [D] P = V.I

Silicon is a/an...

[A] conductor [B] insulator [C] semiconductor [D] superconductor

The equivalent resistance of the resistances connected in parallel is...

[A] smaller than the smallest resistance [B] larger than the largest resistance
[C] an average of all resistances       [D] algebraic sum of all resistances

1 unit of domestic electrical energy is...

[A] 1 joule [B] 1 watt.sec [C] 3.6 x 10⁶ joule [D] 3.6 x 10⁶kWh

Three resistances of equal magnitude are connected in parallel. The circuit current is 3 A. Then the current passing through each resistor is...
```
[A] 3 A [B] 1 A [C] 9 A [D] 1/3 A
```

How much total electric charge is present on 100 protons?

[A] 6 x 10^-19C [B] 6 x 10^-17C [C] 1.6 x 10^-19C [D] 1.6 x 10^-17C

Which of the following is a good conductor of electricity?
```
[A] Rubber [B] Glass [C] Plastic [D] Graphite
```
Which of the following is a bad conductor (insulator) of electricity?
```
[A] Copper [B] Graphite [C] Glass [D] Silver
```

Which of the following statements is true for electric current?

[A] The direction of conventional current and that of electrons is opposite.
[B] The direction of conventional current and that of electrons is same. 
[C] The direction of conventional current is random.
[D] Electron flow is random.

1 μA = ______ mA
```
[A] 10^-1 [B] 10^-2 [C] 10^-3 [D] 10³
```
1 mA = _____ μA
```
[A] 10^-1 [B] 10^-3[C] 10³ [D] 10⁶
```
How many electrons will carry 4.8 x 10^-16 C charge?
```
[A] 300 [B] 3000 [C] 480 [D] 4800
```
The unit coulomb/sec is expressed as...
```
[A] Ampere [B] Volt [C] Ohm [D] Watt
```
The SI unit of electric current is...
```
[A] Ohm [B] Coulomb [C] Ampere [D] Volt
```
If the electric charge passing through a conductor in 5 minutes is 480 C, the current flowing through it is...
```
[A] 96 [B] 2400 [C] 1.6 [D] 2.4
```
Which device is used to measure electrical potential difference?
```
[A] Ammeter [B] Voltmeter [C] Wattmeter [D] Galvanometer
```
The SI unit of electrical potential difference is...
```
[A] Ampere [B] Ohm [C] Weber [D] Volt
```
1.5 C charge is moved from a point at 5 V potential to a point at 8 V potential. What is the amount of work done in joule?
```
[A] 1.5 [B] 2.0 [C] 3.0 [D] 4.5
```
If the work done to move 4 C charge from one point to another point is 10 joule, what is the potential difference between those points?
```
[A] 2.5 V [B] 40 V [C] 14 V [D] 160 V
```

Which of the following is true?

[A] Joule = (volt/coulomb)  [B] Volt = (joule/coulomb)
[C] Coulomb = (volt/joule) [D] Coulomb = (joule x volt)

According to Ohm's law...

[A] Current increases linearly with increase in voltage.
[B] The current ---> voltage graph is a straight line.
[C] The ratio of voltage and current is constant.
[D] All three in A, B and C are correct.

The SI unit of resistance is...

[A] volt [B] volt.ampere [C] ampere/volt [D] volt/ampere

Which of the following materials has least resistance?
```
[A] Aluminium [B] Glass [C] Carbon [D] Silicon
```
1.5 A current flows through a resistor when it is connected to a circuit with 3 V potential difference. What is the value of resistance?
```
[A] 4.5Ω [B] 2Ω [C] 0.5Ω [D] 1.5Ω
```
When a 15V battery is connected across a resistor of 6Ω, the amount of charge passing through it per second is...
```
[A] 90 C [B] 2/3 C [C] 2.5 C [D] 9 C
```
If the resistance of a circuit is doubled and the applied potential difference is halved, the current passing through the circuit will ...
```
[A] become 1/4 of original  [B] become 1/2 of original
[C] become 4 times original [D] not change
```
If the resistance of a circuit is halved and the applied potential difference is doubled, the current passing through the circuit will ...
```
[A] become 1/4 of original  [B] become 1/2 of original
[C] become 4 times original [D] not change
```
A 200 m long wire has cross sectional area of 10^-6 sq. m and its material has resistivity of 10^-7Ω.m. What will be its resistance?
```
[A] 0.2Ω [B] 2Ω [C] 20Ω [D] 200Ω
```
When two resistors with resistances R₁ and R₂ are connected in series and parallel, their equivalent resistances are R₃ and R₄, respectively. Then...
```
[A] R₁R₂ = R₃R₄ [B] R₁R₃ = R₂R₄ [C] R₁R₄ = R₃R₂ [D] R₁R₂R₃R₄ = 1
```
When two resistors with resistance of 10Ω and 20Ω are connected in series with a 3 V battery, the current passing through the circuit will be...
```
[A] 0.1 A [B] 1 A [C] 2 A [D] 3 A
```
When two resistors of 6Ω and 6Ω are connected in parallel with a 12V battery, the current flowing through the circuit is...
```
[A] 1.0 A [B] 2.0 A [C] 4.0 A [D] 0.25 A
```

The kilowatt-hour is a unit of...

[A] electrical potential [B] electric power [C] electric energy [D] electric current

7.2 x 10⁹ joule = _____ units of electrical energy.
```
[A] 0.2 [B] 20 [C] 2000 [D] 5000
```
An electric lamp draws a current of 0.5 A when connected to a 9V battery. What is the power rating of the bulb?
```
[A] 4.5 W [B] 18 W [C] 41.5 W [D] 2.25 W
```
If an electric iron has power rating of 2 kW, the cost of energy consumed for 24 hours at the rate of Rs. 6 per unit is equal to...
```
[A] Rs. 48 [B] Rs. 144 [C] Rs. 72 [D] Rs. 288
```
How many joules of energy is transferred by an electric bulb of 60 W power rating in one minute?
```
[A] 60 [B] 1000 [C] 3600 [D] 6000
```
A bulb has rating 12 V, 1 A. How much energy is consumed by it in 10 minutes?
```
[A] 120 J [B] 1200 J [C] 720 J [D] 7200 J
```

Match the physical quantities in Part A with their units in Part B.

[A] 1-c, 2-a, 3-d, 4-b [B] 1-c, 2-b, 3-d, 4-a
[C] 1-b, 2-d, 3-c, 4-a [D] 1-b, 2-a, 3-d, 4-c

Match the physical quantity in Part A with formula in Part B.

[A] 1-c, 2-d, 3-a, 4-b [B] 1-b, 2-d, 3-a, 4-c
[C] 1-b, 2-c, 3-d, 4-a [D] 1-c, 2-b, 3-a, 4-d

Which of the following circuit symbol represents electric cell?
Which of the following circuit symbol represents a resistor?
What will be the equivalent resistance in the following circuit?
```
[A] 2 Ω [B] 3 Ω [C] 4 Ω [D] 6 Ω
```
What will be the equivalent resistance between points A and b in the following circuit?
```
[A] 1 Ω [B] 2 Ω [C] 3 Ω [D] 4 Ω
```
What will be the equivalent resistance between points A and b in the following circuit?
```
[A] 1 Ω [B] 2 Ω [C] 3 Ω [D] 4 Ω
```
Which of the following circuits has the lowest equivalent resistance?
```
[A] Figure 1 [B] Figure 2 [C] Figure 3 [D] Figure 4
```
Two resistors each of value R are connected in series in a circuit with V volt battery. If two more resistances each of magnitude R are connected in series in this circuit, the current in the circuit will...
```
[A] become double [B] become half [C] not change [D] become one fourth
```
In an electric circuit, three bulbs of 40W, 60W and 100W are connected in series. The voltage drop is maximum across ____ bulb.
```
[A] 40W [B] 60W [C] 100W [D] None
```
According to Ohm's law, voltage drop is inversely proportional to...
```
[A] I [B] 1/I [C] R [D] 1/R
```
A 2 kW heater works on domestic voltage main supply. What should be the current rating of the fuse?
```
[A] 2 A [B] 5 A [C] 10 A [D] 6 A
```
6 C charge is passing through an electric bulb in one minute. How much current will pass through it?
```
[A] 10 A [B] 1 A [C] 0.1 A [D] 0.01 A
```

On what does the heat produced in a resistance depend?

[A] Electric current passed          [B] Resistance 
[C] Time for which current is passed [D] All of these

The electric force between two charges, q₁ and q₂, is ______ proportional to the product of the magnitudes of the charges and _____ proportional to the square of the distance between them.
```
[A] directly, inversely [B] directly, directly 
[C] inversely, directly [D] inversely, inversely
```
The resistance of a conductor is R. The resistance of another conductor of identical material and equal length with twice the diameter is...
```
[A] R/4 [B] R/2 [C] 2R [D] 4R
```
Which of the following combinations of length(l) and cross-sectional area(A) will give a certain volume of copper the least resistance?
```
[A] l and A [B] 2l and A/2 [C] l/2 and 2A [D] none as the volume is same
```
A resistor R₁ dissipates power P when connected to a certain generator. If a resistor R₂ is inserted in series with R₁, the power dissipated by R₁...
```
[A] decreases [B] increases [C] remains the same [D] any of the above depending on R₁ and R₂
```
A resistor R₁ dissipates power P when connected to a certain generator. If a resistor R₂ is inserted in parallel with R₁, the power dissipated by R₁...
```
[A] decreases [B] increases [C] remains the same [D] any of the above depending on R₁ and R₂
```
A 20-V potential difference is applied across a series combination of a 10 Ω and a 30 Ω resistors. The current in the 10 Ω resistor is...
```
[A] 0.5 A [B] 0.67 A [C] 1 A [D] 2 A
```
Two identical resistors in parallel have an equivalent resistance of 2 Ω. If the resistors were in series, their equivalent resistance would be...
```
[A] 2 Ω [B] 4 Ω [C] 8 Ω [D] 16 Ω
```
A 12-V potential difference is applied across a series combination of four 6Ω resistors. The current in each resistor is...
```
[A] 0.5A [B] 2A [C] 8A [D] 18A
```
A 12-V potential difference is applied across a parallel combination of four 6Ω resistors. The current in each resistor is...
```
[A] 0.5A [B] 2A [C] 8A [D] 18A
```
If a charge of Q coulomb flows in a part of a circuit across which there is a potential difference of V volt then the energy change W in joule is given by...
```
[A] Q.V [B] Q/V [C] V/Q [D] Q²/V
```
```
[A][B][C][D]
```

ANSWERS

(1) D (2) C (3) B (4) A (5) C (6) B (7) C (8) C (9) A (10) B (11) C (12) D (13) D (14) A (15) B (16) D (17) A (18) C (19) A (20) A (21) D (22) D (23) B (24) A (25) C (26) C (27) D (28) C (29) C (30) B (31) D (32) A (33) C (34) A (35) D (36) C (37) B (38) A (39) C (40) D (41) B (42) A (43) C (44) C (45) A (46) C (47) B (48) D (49) D (50) C (51) A (52) C (53) C (54) B (55) A (56) C (57) C (58) B (59) D (60) D (61) A (62) A (63) D (64) D (65) A (66) B (67) C (68) D (69) C (70) C (71) A (72) A (73) C (74) C (75) C (76) A (77) D (78) C (79) D (80) C (81) B (82) A (83) B (84) B (85) B (86) B (87) A (88) B (89) C (90) B (91) B (92) C (93) D (94) A (95) A (96) C (97) A (98) C (99) A (100) C (101) A (102) B (103) A

Friday, December 27, 2013

Chapter 5 : MAGNETIC EFFECTS OF ELECTRIC CURRENT

Choose Appropriate Alternative

The direction of magnetic field lines in the region outside the bar magnet is...

[A] from the N pole towards the S pole of the magnet. 
[B] from the S pole towards the N pole of the magnet.
[C] in the direction coming out from both the poles of the magnet.
[D] in the direction entering both the poles of the magnet.

Which of the following statements is false?

[A] The direction of magnetic field lines is from N to S.
[B] In the region where magnetic field lines are at a close distance from one another, 
there will be a strong magnetic field. 
[C] The magnetic field lines form closed loops. 
[D] The magnetic field lines can cross one another.

By which instrument can the presence of magnetic field be determined?
```
[A] Voltmeter [B] Ammeter [C] Galvanometer [D] Magnetic needle
```
Who was the first to observe the magnetic effect of electric current?
```
[A] Faraday [B] Oersted [C] Volta [D] Ampere
```

With the help of which law can the direction of a magnetic field decided?

[A] Faraday's law          [B] Fleming's right hand rule 
[C] Right hand thumb rule  [D] Fleming's left hand rule

According to the Right hand thumb rule, direction of what is indicated by the thumb?
```
[A] Electric current [B] Magnetic field [C] Magnetic force [D] Motion of conductor
```

The magnetic field produced in a straight conducting wire on passing current through it is...

[A] in the direction of current [B] in the direction opposite to the current 
[C] circular around the wire    [D] in the direction parallel to the wire

What is the type of field line of a magnetic field passing through the centre of current carrying circular ring?
```
[A] Circular [B] Straight line [C] Ellipse [D] Magnetic field is zero at centre.
```

Which of the following has magnetic field like that of a bar magnet?

[A] Current carrying wire     [B] Current carrying ring 
[C] Current carrying solenoid [D] Current carrying rectangular loop

Who gave the principle of electromagnetic induction?
```
[A] Faraday [B] Oersted [C] Volta [D] Ampere
```

Which is the direction of magnetic force acting on a current carrying wire placed in a magnetic field?

[A] along magnetic field            [B] along the electric current 
[C] perpendicular to magnetic field [D] opposite to magnetic field

How is a current carrying wire placed in a magnetic field so that magnetic field does not act on it?

[A] Parallel to the magnetic field             [B] Perpendicular to the magnetic field 
[C] Making angle of 40° with magnetic field [D] Can be arranged any way.

In which of the following cases, the induced current in the loop will not be obtained?

[A] The loop is moved in the direction of the magnet. 
[B] The magnet is moved in the direction of the loop.
[C] The loop and the magnet are moved in opposite direction with same speed.
[D] The loop and the magnet are moved in one direction with same speed.

Which instrument is used for converting electrical energy into mechanical energy?
```
[A] Electric generator [B] Electric motor [C] Electric iron [D] Electric oven
```

On which principle does the electric generator work?

[A] Electrical energy is converted to mechanical energy.
[B] Electrical energy is converted to thermal energy.
[C] Mechanical energy is converted to electrical energy.
[D] Electrical energy is converted to light energy.

The magnitude of AC voltage used in India is _____ and the frequency is _____.
```
[A] 110V, 60Hz [B] 110V, 50Hz [C] 220V, 50Hz [D] 220V, 60Hz
```
Which coloured insulation cover is used for earthing wire?
```
[A] Red [B] Black [C] Green [D] Can be of any colour
```

Which type of current is obtained from a battery?

[A] AC [B] DC [C] Both AC and DC [D] Depends on type of battery

Which of the following instruments is used to know the presence of electric current?
```
[A] Fuse [B] Galvanometer [C] Voltmeter [D] Magnetic needle
```

A fuse wire is...

[A] a conductor [B] an insulator [C] a semi-conductor [D] made of any material

______ is the rule used to know the direction of the induced current in the circuit.

[A] Fleming's left hand rule [B] Fleming's right hand rule 
[C] Right hand thumb rule    [D] Ampere's rule

How many times does an Alternating current (AC) with frequency 50Hz change its direction?
```
[A] 25 [B] 50 [C] 100 [D] 200
```
At the centre of which of the following four circular rings the magnetic field is the strongest for equal magnitude of current?
```
[A] Figure A [B] Figure B [C] Figure C [D] Figure D
```

The magnetism of magnets is maximum...

[A] at poles [B] at the centre [C] at the axis [D] everywhere in the magnet

Within a bar magnet, the magnetic field lines are...

[A] from N to S [B] from S to N [C] absent [D] in both directions

The strength of magnetic field produced in a current carrying straight conductor is...

[A] directly proportional to the distance from the wire 
[B] directly proportional to the magnitude of the current in wire
[C] inversely proportional to the magnitude of the current in wire
[D] independent of the magnitude of the current in wire

The magnetic field inside a solenoid is...

[A] strong at N pole and weak at S pole
[B] strong at S pole and weak at N pole
[C] uniform throughout 
[D] zero

What is not true?

[A] A solenoid is an electromagnet. [B] A solenoid is a temporary magnet.
[C] A solenoid is a permanent magnet. [D] A solenoid is like a bar magnet.

A fuse wire is generally made of...

[A] copper [B] aluminium [C] alloy of lead and tin [D] alloy of copper and lead

In our domestic electric supply, we use following three colours of insulation cover on wires:

[A] Red, blue, green     [B] Red, yellow, blue
[C] Black, green, yellow [D] Red, black, green

The current passing through two separate lines (circuits) of our houses is _____ A and _____ A.
```
[A] 5, 10 [B] 5, 15 [C] 10, 15 [D] 2, 5
```

Which of the following is not a permanent magnet?

[A] Magnetic needle [B] Bar magnet [C] Electromagnet [D] Horse-shoe magnet

The force experienced by a current carrying wire placed in a magnetic field will be maximum when it is...

[A] at an angle of 45° to the magnetic field 
[B] at right angle to the magnetic field 
[C] parallel to the magnetic field 
[D] anti-parallel to the magnetic field

A magnetic field will not exert force on...

[A] a bar magnet     [B] a stationary electric charge
[C] an electromagnet [D] an electric charge moving perpendicularly to it

On which of the following does the electromotive force not depend?

[A] The relative motion of the coil and magnet [B] Number of turns 
[C] Rate of change of flux linked with the coil[D] Material of the coil

During the situation of short-circuit, the current in the circuit...

[A] reduces to zero [B] increases greatly [C] does not change [D] oscillates

If many appliances are connected in a circuit, _____ may occur.

[A] short-circuit [B] long-circuit [C] over loading [D] explosion

At the centre of which of the following four circular rings the magnetic field is the strongest for equal magnitude of current?
```
[A] Loop 1 [B] Loop 2 [C] Loop 3 [D] Loop 4
```

Match the following in Part A with appropriate alternative in Part B.

[A] 1-b, 2-c, 3-d, 4-a [B] 1-c, 2-d, 3-b, 4-a
[C] 1-a, 2-d, 3-b, 4-c [D] 1-a, 2-c, 3-d, 4-b

What is the potential difference of the current flowing in the insulated wires in America?
```
[A] 220 V [B] 100 V [C] 110 V [D] 60 V
```
_____ current line is connected to the air-conditioning machine.
```
[A] 20 A [B] 15 A [C] 10 A [D] 5 A
```
If the current flowing through each turn of a solenoid is in the same direction, the magnetic field produced by n turns will be ____ with the magnetic field due to each turn.
```
[A] added [B] subtracted [C] multiplied [D] divided
```

The magnitude of the induced current due to the relative motion of coil and a magnet does not depend on...

[A] speed of the relative motion [B] number of turns of coil
[C] resistivity of wire of coil  [D] pole strength of the magnet

Which of the following statements is not suitable with reference to Direct Current(DC)?

[A] Electric current flows always from positive pole to negative pole.
[B] The value of electric current is always constant with time.
[C] Its production is cheap
[D] More energy is wasted in its conduction

```
[A][B][C][D]
```

ANSWERS

(1) A (2) D (3) D (4) B (5) C (6) D (7) C (8) B (9) C (10) A (11) C (12) A (13) D (14) B (15) C (16) C (17) C (18) B (19) B (20) A (21) B (22) C (23) A (24) A (25) B (26) B (27) C (28) C (29) C (30) D (31) B (32) C (33) B (34) B (35) D (36) B (37) C (38) D (39) D (40) C (41) B (42) C (43) C (44) C (45)

Friday, December 20, 2013

Chapter 6 : UNIVERSE

Choose Appropriate Alternative

Which of the following is a star?

[A] Sun [B] Phobos [C] Asteroid [D] Comet

Which of the following is not a member of our solar system?

[A] Asteroid [B] Shooting star [C] Sun [D] Artificial satellite

What is the periodic time of Halley's comet?

[A] 67 years [B] 76 years [C] 86 years [D] 100 years

Matter in the core region of the Sun is in _____ state.
```
[A] solid [B] liquid [C] gaseous [D] plasma
```
_____ is the most brilliant planet of our solar system.
```
[A] Earth [B] Venus [C] Jupiter [D] Mars
```

Poles of Mars are covered by...

[A] dry-ice [B] water-ice [C] nitrogen [D] iron

_____ was the first person to land on moon.

[A] Yuri gagarin [B] Aleksi Leonov [C] Kalpana Chawla [D] Neil Armstrong

The distance of a geostationary satellite above Earth's surface is _____ km.
```
[A] 43000 [B]  37956 [C] 35786 [D] 23123
```
Using telescope, who discovered four large moons of Jupiter in 17th century?
```
[A] Galileo [B] Kepler [C] Newton [D] Hubble
```
The first imaging X-ray telescope launches by NASA in 1978 was named...
```
[A] Galileo [B] Kepler [C] Einstein [D] Hubble
```
The X-ray radio telescope 'Einstein' was renamed_____ in 1999 by NASA.
```
[A] Galileo [B] Hubble [C] Chandra [D] Kepler
```

Who presented 'Geo-centric' model of Universe?

[A] Copernicus [B] Galileo [C] Kepler [D] Ptolemy

Who presented 'Helio-centric' model of Universe?

[A] Copernicus [B] Galileo [C] Plato [D] Ptolemy

Who discovered the laws of planetary motion?

[A] Copernicus [B] Kepler [C] Galileo [D] Newton

'There is no obvious centre of the Universe'. this fact is suggested by...

[A] Newton's first law of motion [B] Kepler's laws of planetary motion
[C] Einstein's theory of relativity [D] Universal law of gravitation

The estimated age of our solar system is _____ years.

[A] 3.72 billion [B] 4.568 billion [C] 4.923 billion [D] 4.865 billion

About _____% of the mass of the solar system is concentrated in Sun.
```
[A] 97.56 [B] 96.98 [C] 99.86 [D] 98.96
```

The planets are kept in their orbits by...

[A] centripetal force [B] centrifugal force [C] nuclear force [D] magnetic force

The diameter of Sun is about _____ km.

[A] 15,29,000 [B] 15,92,000 [C] 14,29,000 [D] 13,92,000

The temperature in the core region of Sun is about _____ K.
```
[A] 0.5 crore [B] 1.0 crore [C] 1.05 crore [D] 1.5 crore
```

Einstein's mass-energy relation is...

[A] E = Δm.c [B] E = Δm.c² [C] E = (Δm)².c[D] E = (Δm.c)²

During thermonuclear fusion process taking place in Sun, four hydrogen nuclei fuse to form a nucleus of...
```
[A] carbon [B] helium [C] heavy hydrogen [D] radium
```
At the surface of Sun, the temperature is about _____ K.
```
[A] 3000 [B] 4500 [C] 6000 [D] 15000
```

Sun spots result due to variation in...

[A] Earth's magnetic field [B] Sun's magnetic field 
[C] Earth's temperature   [D] Sun's temperature

The thickness of photosphere of Sun is about _____ km.
```
[A] 400 [B] 600 [C] 800 [D] 1000
```
Which of the following is not a terrestrial planet?
```
[A] Earth [B] Mercury [C] Mars [D] Jupiter
```
Which of the following is not a Jovian planet?
```
[A] Earth [B] Jupiter [C] Saturn [D] Neptune
```
_____ is the smallest planet of our solar system.
```
[A] Mercury [B] Earth [C] Venus [D] Pluto
```
The ratio of the mass of Mercury to mass of Earth is...
```
[A] 1:12 [B] 12:1 [C] 1:18 [D] 18:1
```
The daytime and night-time temperatures on Mercury are ______ and ______, respectively.
```
[A] 427°C, 173°C [B] 427°C, 100°C [C] 427°C, -173°C [D] 472°C, -173°C
```

Which planets have no moon?

[A] Mercury and Mars [B] Venus and Mars [C] Mercury and Venus [D] Venus and saturn

The Sun rises in the west on...

[A] Mercury [B] Venus [C] Mars [D] Neptune

Which pair of the planets forms neighbours of Earth?

[A] Mercury, Venus [B] Venus, Mars [C] Mercury, Mars [D] Mars, Jupiter

The atmosphere of Venus largely consists of clouds of...
```
[A] O₂ [B] H₂ [C] CO₂ [D] N₂
```

Phobos and Deimos are the moons of...

[A] Mars [B] Venus [C] Uranus [D] Saturn

Jupiter is about _____ times bigger than the Earth.
```
[A] 1000 [B] 1200 [C] 1400 [D] 1600
```
Saturn is about _____ times bigger than the Earth.
```
[A] 450 [B] 550 [C] 650 [D] 850
```

_____ is the largest moon of Saturn.

[A] Phobos [B] Ceres [C] Triton [D] Titan

Uranus is about _____ times bigger than the Earth.
```
[A] 37 [B] 46 [C] 64 [D] 84
```

Triton and Nerid are moons of...

[A] Neptune [B] Uranus [C] Jupiter [D] Mars

The orbit of _____ is highly elliptical.

[A] Venus [B] Neptune [C] Uranus [D] Pluto

There are about _____ asteroids.

[A] 1 million [B] 1 lac [C] 10,000 [D] 50,000

The diameter of the largest known asteroid, Ceres, is about _____ km.
```
[A] 100 [B] 400 [C] 1000 [D] 4000
```
The diameter of the asteroid, Vesta, is about _____ km.
```
[A] 100 [B] 400 [C] 1000 [D] 4000
```

Meteors are seen in large numbers during the period between...

[A] August to November [B] November to February 
[C] March to May       [D] June to August

If an object entering Earth's atmosphere from space falls on Earth, it is called...
```
[A] a comet [B] a meteor [C] a meteorite [D] an asteroid
```
If the surface temperature of a star is very low, the star appears...
```
[A] blue [B] white [C] red [D] yellow
```
If the surface temperature of a star is very high, the star appears...
```
[A] blue [B] white [C] red [D] yellow
```
There are _____ nakshatras.
```
[A] 22 [B] 24 [C] 25 [D] 27
```

The angular region of every nakshatra is...

[A] 12° 30' [B] 13° 20' [C] 14° 20' [D] 12° 40'

The sun remains in one nakshatra for about _____ days.
```
[A] 15 [B] 27 [C] 30 [D] 13.5
```
The diameter of Milky Way is about _____ light years.
```
[A] 15,000 [B] 30,000 [C] 60,000 [D] 1,00,000
```
The Sun is situated about _____ light years away from the galactic centre.
```
[A] 15,000 [B] 30,000 [C] 50,000 [D] 75,000
```
The Sun completes one revolution around the galactic centre in _____ years.
```
[A] 15 crore [B] 22.5 crore [C] 25.2 crore [D] 30 crore
```
There are about _____ stars in a galaxy.
```
[A] 10¹¹ [B] 10¹³ [C] 10¹⁹ [D] 10²²
```
There are about _____ stars in the Universe.
```
[A] 10¹¹ [B] 10¹³ [C] 10¹⁹ [D] 10²²
```

The period of the slowest observed pulsar is...

[A] 8 seconds [B] 80 seconds [C] 8 minutes [D] 80 minutes

Who was the pioneer of space travel?

[A] Albert Einstein [B] Yuri Gagarin [C] Tsiolkowsky [D] Kaspersky

The first artificial satellite launched in space was...

[A] Sputnik-I [B] Explorer-I [C] Challenger [D] Atlantis

The first human being who visited space was...

[A] Yuri Gagarin [B] Neil Armstrong [C] Aleksi Leonov [D] Timolov

The first space-walk was done by _____ on 18th March,1965.

[A] Yuri Gagarin [B] Neil Armstrong [C] Aleksi Leonov [D] Timolov

The first space-shuttle launched on 12th April, 1981, was...
```
[A] Challenger [B] Columbia [C] Discovery [D] Atlantis
```

The full form of LHC is...

[A] Large Hydrogen Collider  [B] Large Hedron Collider
[C] Liquid Hydrogen Collider [D] Liquid Hedron Collider

The first satellite launched by India in 1980 was...
```
[A] INSAT-1 [B] Rohini [C] Aryabhatt [D] IRS-1
```
The minimum speed required for a satellite to revolve around the Earth in an orbit is...
```
[A] 8 km/h [B] 8 km/min [C] 8 km/s [D] 8 m/s
```
The height of a satellite in polar orbit is about _____ km.
```
[A] 200 [B] 700 [C] 1000 [D] 35786
```
The repeating time of remote-sensing satellite of India is...
```
[A] 16 hours [B] 16 days [C] 21 hours [D] 21 days
```
For DTH (Direct to Home) TV transmission, India has launched...
```
[A] Rohini [B] INSAT-1 [C] Cartosat [D] INSAT-4
```
The strength of the gravitational field of Mercury is about _____ times that of the Earth.
```
[A] 1/3 [B] 1/2 [C] 3 [D] 2
```
_____ is the largest planet of our solar system.
```
[A] Earth [B] Jupiter [C] Saturn [D] Neptune
```
There are _____ beautiful rings around Saturn.
```
[A] 2 [B] 3 [C] 4 [D] 5
```
The diameter of Earth is d_e. Then the diameter of Uranus is _____ x d_e.
```
[A] 1.7 [B] 2.7 [C] 3.7 [D] 4.7
```
Asteroids revolve around...
```
[A] Earth [B] Mars [C] Jupiter [D] Sun
```

The tail of a comet is the longest when...

[A] it is nearest to the Sun [B] it is farthest from the Sun
[C] it is far from the Earth [D] it is near Saturn

Which of the following is a star?

[A] A tailed star [B] A shooting star [C] Sun [D] Andromeda

The moon undergoes an angular displacement of _____ in 1 day.
```
[A] 30° [B] 20° 40' [C] 15° 45' [D] 13° 20'
```

The moon stays in one nakshatra for about...

[A] 30 days [B] 13.5 days [C] 7 days [D] 1 day

Sun rises _____ minutes _____ than the time of its rise the previous day.
```
[A] 4, earlier [B] 4, later [C] 8.5, earlier [D] 8.5 later
```
There are about _____ galaxies in the Universe.
```
[A] 10¹¹ [B] 10¹² [C] 10²² [D] 10²³
```

A rocket works on the principle of...

[A] Newton's first law of motion [B] Newton's second law of motion 
[C] Newton's third law of motion [D] Newton's law of gravitation

Which series of satellites is used by India for astronomical observations?
```
[A] Agni [B] Rohini [C] INSAT [D] Kalpana
```

1 light year = _______ km.

[A] 4.96 x 10¹² [B] 6.49 x 10¹²[C] 9.46 x 10¹² [D] 6.94 x 10¹²

1 light year = ______ Au.
```
[A] 63240 [B] 36240 [C] 24360 [D] 60234
```

Astronomical Unit (Au) is the mean distance between...

[A] Earth and Moon [B] Earth and Jupiter [C] Earth and Sun [D] Sun and Jupiter

1 Astronomical unit (Au) = _____ km.

[A] 1.946 x 10⁸ [B] 1.496 x 10⁸ [C] 4.96 x 10⁸ [D] 9.46 x 10⁸

According to _______ there may be more than one universe.

[A] John Kepler [B] Stephen Hawking [C] Albert Einstein [D] Yuri Gagarin

Which planet of our solar system has maximum number of satellites?
```
[A] Mars [B] Saturn [C] Jupiter [D] Neptune
```
Which of the following planets has very large temperature difference between day-time and night-time?
```
[A] Mercury [B] Venus [C] Earth [D] Neptune
```
Halley's comet was last seen in the year _____.
```
[A] 1968 [B] 1978 [C] 1986 [D] 1999
```

Match the statements in Part A with the name of the planet in Part B.

[A] 1-b, 2-c, 3-a, 4-d [B] 1-c, 2-b, 3-d, 4-a 
[C] 1-d, 2-a, 3-c, 4-b [D] 1-d, 2-a, 3-b, 4-c

Match appropriate pairs in Part A and Part B.

[A] 1-b, 2-d, 3-c, 4-a [B] 1-b, 2-d, 3-a, 4-c
[C] 1-d, 2-c, 3-a, 4-b [D] 1-b, 2-c, 3-a, 4-d

Match the satellites in Part A with their functions in Part B.

[A] 1-b, 2-c, 3-a, 4-d [B] 1-d, 2-c, 3-a, 4-b
[C] 1-c, 2-d, 3-a, 4-b [D] 1-d, 2-a, 3-b, 4-c

_____ satellite gives information regarding the life in oceans and the environment around it.
```
[A] EDUSAT [B] RESOURCESAT [C] INSAT-4A [D] METSAT
```

How much time does the earth take to complete one rotation about its own axis?

[A] 24 hours [B] 23 hours 58 minutes [C] 23 hours 57 minutes [D] 23 hours 56 minutes

At what speed does the Sun revolve around the galactic centre?
```
[A] 30,000 km/h [B] 250 m/s [C] 250 km/s [D] 250 km/h
```
_____ is used for launching 1000-2000 kg class of remote sensing satellites.
```
[A] GSLV [B] MSLV [C] PSLV [D] CSLV
```
```
[A][B][C][D]
```
```
[A][B][C][D]
```

ANSWERS

(1) A (2) D (3) B (4) D (5) B (6) A (7) D (8) C (9) A (10) C (11) C (12) D (13) A (14) B (15) C (16) B (17) C (18) A (19) D (20) D (21) B (22) B (23) C (24) B (25) A (26) D (27) A (28) A (29) C (30) C (31) C (32) B (33) B (34) C (35) A (36) C (37) D (38) D (39) C (40) A (41) D (42) B (43) C (44) B (45) A (46) C (47) C (48) A (49) D (50) B (51) D (52) D (53) B (54) B (55) A (56) D (57) A (58) C (59) A (60) A (61) C (62) B (63) B (64) B (65) C (66) C (67) D (68) D (69) A (70) B (71) B (72) C (73) D (74) A (75) C (76) D (77) D (78) A (79) A (80) C (81) B (82) C (83) A (84) C (85) B (86) B (87) C (88) A (89) C (90) C (91) B (92) D (93) B (94) D (95) C (96) C (97)

Sunday, December 15, 2013

Chapter 7 : ACIDS, BASES AND SALTS

Choose Appropriate Alternative

What is formed by the reaction of a non-metal oxide with water?
```
[A] Acid [B] Base [C] Salt [D] Metal
```

Acid + Metal oxide ---> ______

[A] Base + water [B] Salt + water [C] Base + salt [D] Metal + salt

Which gas is produced by the reaction of a base with a metal?

[A] Carbon dioxide [B] Dioxygen [C] Dihydrogen [D] Dinitrogen

500 ml aqueous solution is prepared by dissolving 2 moles of HCl in water. What will be the molarity of this solution?
```
[A] 1 [B] 2 [C] 3 [D] 4
```

What is correct for acidic aqueous solution?

[A] [H₃O⁺] = 10^-7M [B] [H₃O⁺] < 10^-7M [C] [H₃O⁺] > 10^-7M [D] [H₃O⁺] < [OH^-]

Which of the following solutions is most basic?

[A] p^H = 8.2 [B] p^H = 9.3 [C] p^H = 11.5 [D] p^H = 10.6

Which of the following statements is incorrect?

[A] p^H scale was presented by S.P.L.Sorensen. 
[B] p^H scale ranges from 0 to 14.
[C] p^H scale is applicable to only non-aqueous solutions.
[D] p^H scale is applicable to only aqueous solutions.

What is used to measure the exact p^H of an aqueous solution?

[A] p^H paper [B] Litmus paper [C] p^H meter [D] Universal indicator

Which of the following substances is an antacid?
```
[A] NaCl [B] Mg(OH)₂ [C] HCl [D] H₂SO₄
```
How many times less basic is an aqueous solution having p^H = 11 than that having p^H = 8?
```
[A] 3 [B] 30 [C] 300 [D] 1000
```

Which of the following is a strong acid?

[A] Acetic acid [B] Citric acid [C] Nitric acid [D] Oxalic acid

What type of substance is NH₃?

[A] Strong acid [B] Weak acid [C] Strong base [D] Weak base

p^H + p^OH = ______.
```
[A] 7 [B] 0 [C] 14 [D] 10
```

Which of the following formulas is correct?

[A] Mole = molecular mass/weight [B] Mole = weight /molecular mass 
[C] Mole = weight/litre       [D] Mole = molecular mass/litre

What will be the p^H of aqueous solution of NH₄Cl?
```
[A] p^H = 7 [B] p^H > 7 [C] p^H < 7 [D] p^H = 0
```

Which of the following solutions will have p^H = 2?

[A] 0.01M HCl [B] 0.02M HCl [C] 0.01M H₂SO₄ [D] 0.02M H₂SO₄

What will be the concentration of OH^- ion in aqueous solution having p^H = 8?
```
[A] 1 x 10^-8M [B] 1 x 10^-6M [C] 8 x 10^-6M [D] 8 x 10^-8M
```
The p^H values of solutions A, B, C and D are 1.9, 2.5, 2.1 and 3.0, respectively. Their order of acidity will be...
```
[A] A < C < B < D [B] D < C < B < A [C] D < B < C < A [D] D > C > B > A
```

Which solution will be basic?

[A] [H₃O⁺] = 10^-5M [B] [H₃O⁺] = 10^-12M
[C] [H₃O⁺] = 10^-7M [D] [H₃O⁺] = 10^-4M

Which substance is present in the poison of honey bee?

[A] Lime [B] Calcium phosphate [C] Mellitin [D] Pepsin

Who gave operational definitions of acids and bases?

[A] Robert Boyle [B] Arrhenius [C] Bronsted-Lowry [D] Sorensen

Who gave acid-base theory based on the process of ionization?
```
[A] Robert Boyle [B] Arrhenius [C] Bronsted-Lowry [D] Lewis
```
According to Arrhenius, base is a substance producing _____ ion in aqueous solution.
```
[A] H⁺ [B] OH^- [C] H₃O⁺ [D] K⁺
```
Which of the following does not have independent existence?
```
[A] H⁺ [B] H₂ [C] H₃O⁺ [D] NH₃
```

According to Bronsted-Lowry, an acid is a substance which...

[A] accepts proton from another substance [B] donates proton to another substance 
[C] does not ionize [D] does not produce OH^- ion in aqueous solution

According to Bronsted-Lowry, a base is a substance which...

[A] does not form covalent bond [B] accepts proton from another substance
[C] ionizes completely         [D] donates proton to another substance

The bond between H⁺ and H₂O in H₃O⁺ is...

[A] ionic [B] covalent [C] coordinate covalent [D] metallic

According to Bronsted-Lowry, when HCl gas is dissolved in water, water behaves as...
```
[A] an acid [B] a base [C] a neutral substance [D] a salt
```
According to Bronsted-Lowry, when ammonia gas is dissolved in water, water behaves as...
```
[A] an acid [B] a base [C] a neutral substance [D] a salt
```
According to the acid-base theory by Bronsted-Lowry, water is...
```
[A] an acid [B] a base [C] amphoteric [D] neutral
```
The formula of carbonic acid is...
```
[A] H₂SO₃ [B] CO₂ [C] H₂CO₃ [D] HCO₃
```
Which of the following gives an acid when dissolved in water?
```
[A] NH₃ [B] Na₂O [C] CaO [D] SO₃
```
Which of the following gives a basic solution when dissolved in water?
```
[A] CO₂ [B] SO₂ [C] SO₃ [D] Na₂O
```
Which of the following metals generally do not react with acids?
```
[A] Au [B] Ag [C] Pt [D] All three
```
Which of the following metals easily reacts with an acid?
```
[A] Ca [B] Au [C] Ag [D] Pt
```
When nitric acid reacts with a metal like zinc,______ gas is produced.
```
[A] NO₂ [B] H₂ [C] NO [D] N₂O
```

The reaction between an acid and a base is called...

[A] acid hydrolysis [B] hydrolysis [C] alkalisation [D] neutralization

When an acid reacts with a metal carbonate/bicarbonate _____ gas is produced.
```
[A] CO₂ [B] CO [C] CO₂ or CO [D] both CO₂ and CO
```

The formula of sodium zincate is...

[A] NaZn₂O₄ [B] Na₂ZnO₂ [C] NaZnO₃ [D] Na₂Zn₂(OH)₃

The unit of molarity is...

[A] mole/kg [B] kg/mole [C] mole/litre [D] kg/litre

The molecular mass of NaOH is 40 g/mole. How much NaOH is required to prepare 250 ml 1M solution of NaOH?
```
[A] 10g [B] 40g [C] 160g [D] 100g
```
The molecular mass of H₂SO₄ is 98. If 29.4g H₂SO₄ is dissolved in water to make 500 ml solution, what is its molarity?
```
[A] 0.3M [B] 0.6M [C] 0.15M [D] 0.5M
```
When 112g of KOH is dissolved in water to make 4 litre solution, its molarity is 0.5M. What is the molecular mass of KOH?
```
[A] 112 [B] 224 [C] 56 [D] 28
```

The formula for the p^H of an aqueous solution is...

[A] p^H = log₁₀ [H₃O⁺] [B] p^H = -log₁₀ [H₃O⁺]
[C] p^H = log₁₀ [OH^-][D] p^H = -log₁₀ [OH^-]

At 298 K, the concentration of H₃O⁺ in pure water is...
```
[A] 1 x 10^-7M [B] 1 x 10⁷M [C] 7.0M [D] 0.7M
```
If the colour of p^H paper turns pink in an aqueous solution, then the approximate p^H of the solution is...
```
[A] 8 [B] 6 [C] 4 [D] 2
```
If the colour of p^H paper turns blue in an aqueous solution, then the approximate p^H of the solution is...
```
[A] 10 [B] 8 [C] 7 [D] 5
```
The range of p^H suitable for efficient biological processes in humans is...
```
[A] 5.6 to 6.5 [B] 6.5 to 7.0 [C] 7.0 to 7.8 [D] 7.8 to 8.7
```
The range of p^H suitable for proper activity of enzyme pepsin in stomach is...
```
[A] 8 to 9 [B] 6 to 8 [C] 4 to 6 [D] 1 to 3
```
The range of p^H of the soil suitable for better growth and development of plants is...
```
[A] 5.6 to 6.5 [B] 6.5 to 7.3 [C] 7.3 to 7.8 [D] 7.8 to 8.7
```
Farmers use _____ for neutralization of acidic soil.
```
[A] CaSO₄.2H₂O [B] CaO [C] H₂CO₃ [D] CH₃COOH
```
Farmers use _____ for neutralization of alkaline soil.
```
[A] CaSO₄.2H₂O [B] CaO [C] NaOH [D] KOH
```

The external surface of our teeth is made up of...

[A] calcium sulphate [B] calcium carbonate [C] calcium phosphate [D] calcium chloride

The external surface of our teeth gets corroded if the p^H within the mouth is...

[A] less than 5.5      [B] between 5.5 and 7.0 
[C] between 7.0 and 7.5 [D] beyond 7.5

Red ants contain _____ in their body.

[A] citric acid [B] formic acid [C] acetic acid [D] oxalic acid

Melittin is a polypeptide consisting of _____ amino acids.
```
[A] 20 [B] 22 [C] 24 [D] 26
```
The p^H values for two aqueous solutions 'A' and 'B' are 2 and 5, respectively. If the concentration of H₃O⁺ in 'A' is 'x' mole/lit, then the concentration of H₃O⁺ in 'B' is _____ mole/lit.
```
[A] x/3 [B] 3x [C] 2x/5 [D] x/1000
```
If (p^H of solution A - p^H of solution B) = x, then the ratio of concentrations of H₃O⁺ in solution B and solution A is...
```
[A] x [B] 10x [C] 10^x [D] x/10
```
If (p^H of solution A - p^H of solution B) = x, then the ratio of concentrations of OH^- in solution A and solution B is...
```
[A] x/10 [B] 10^x [C] 10x [D] x
```
If the difference between p^H and p^OH of a solution is 4, then p^H = ______.
```
[A] 10 [B] 9 [C] 8 [D] 6
```
If the difference between p^OH and p^H of a solution is 4, then p^H = ______.
```
[A] 4 [B] 5 [C] 6 [D] 8
```

Which of the following is a weak acid?

[A] Sulphuric acid [B] Nitric acid [C] Citric acid [D] Hydrochloric acid

The concentration of H₃O⁺ in 1 M aqueous solution of sulphuric acid is...
```
[A] 1 M [B] 2 M [C] 0.5 M [D] 0 M
```
The concentration of SO₄^-2 in 1 M aqueous solution of sulphuric acid is...
```
[A] 1 M [B] 2 M [C] 0.5 M [D] 0.01 M
```
The p^H of a salt solution obtained by the reaction between a strong acid and a strong base is...
```
[A] is 7 [B] is less than 7 [C] is more than 7 [D] cannot be determined
```

Sodium chloride is a salt of...

[A] a weak acid and a weak base    [B] a strong acid and a strong base
[C] a weak acid and a strong base [D] a strong acid and a weak base

Which of the following is a salt of a strong acid and a strong base?
```
[A] Na₂CO₃ [B] NH₄NO₃ [C] NH₄Cl [D] KNO₃
```
Which of the following is a salt of a weak acid and a strong base?
```
[A] NaCl [B] KNO₃ [C] Na₂CO₃ [D] NH₄NO₃
```
Which of the following is a salt of a strong acid and a weak base?
```
[A] NaCl [B] Na₂CO₃ [C] NH₄Cl [D] CH₃COONH₄
```
Which of the following is a salt of a weak acid and a weak base?
```
[A] NaCl [B] KNO₃ [C] Na₂CO₃ [D] (NH₄)₂CO₃
```
The aqueous solution of a salt obtained by the reaction between a weak acid and a weak base is...
```
[A] acidic [B] basic [C] neutral [D] any one of A, B and C
```
Which gas is liberated by the reaction of an acid with a carbonate?
```
[A] H₂ [B] CO₂ [C] N₂ [D] O₂
```
The number of moles of a solute dissolved in 1 litre solution is called...
```
[A] normality [B] molality [C] molarity [D] acidity
```
Which of the following acids is secreted in our stomach?
```
[A] H₂SO₄ [B] HCl [C] HNO₃ [D] Citric acid
```
A substance 'Z' ionizes completely in an aqueous solution releasing H₃O⁺ ion. The substance 'Z' is a...
```
[A] strong acid [B] strong base [C] weak acid [D] weak base
```

NaOH is ...

[A] a salt [B] a weak base [C] a strong base [D] a strong acid

Which of the following is the correct formula for 'mole'?

[A] Molecular mass/weight [B] weight/litre [C] weight/molecular mass [D] litre/weight

What is the nature of an aqueous solution having p^OH = 5?
```
[A] Acidic [B] Basic [C] Neutral [D] Amphoteric
```
What is the molecular formula of milk of magnesia?
```
[A] Mg(OH)₂ [B] MgCO₃ [C] NaHCO₃ [D] MgO
```
What will be the value of p^H of 10^-5 M NaOH solution?
```
[A] 5 [B] 8 [C] 9 [D] 10
```
When blue litmus paper is dipped in an aqueous solution 'A', its colour does not change. Which of the following is true for 'A'?
```
[A] It is neutral. [B] It is basic. [C] It is not acidic. [D] It is acidic or neutral.
```

Match the pairs from Part A and Part B

[A] 1-q, 2-s, 3-r, 4-p [B] 1-r, 2-p, 3-q, 4-s
[C] 1-r, 2-p, 3-s, 4-q [D] 1-q, 2-p, 3-r, 4-s

Match the names in Part A with appropriate formula in Part B.

[A] 1-s, 2-p, 3-q, 4-t [B] 1-q, 2-s, 3-p, 4-t 
[C] 1-q, 2-p, 3-s, 4-r [D] 1-r, 2-s, 3-p, 4-q

If there is a decrease in the concentration of H₃O⁺, what is the change in the p^H of the solution?
```
[A] No change [B] Increase [C] Decrease [D] may increase or decrease
```
Neutralization between a weak acid and a weak base results in the formation of a _____ salt.
```
[A] acidic [B] basic [C] neutral [D] any of these
```
```
[A][B][C][D]
```

ANSWERS

(1) A (2) B (3) C (4) D (5) C (6) C (7) C (8) C (9) B (10) D (11) C (12) D (13) C (14) B (15) C (16) A (17) B (18) C (19) B (20) C (21) A (22) B (23) B (24) A (25) B (26) B (27) C (28) B (29) A (30) C (31) C (32) D (33) D (34) D (35) A (36) C (37) D (38) A (39) B (40) C (41) A (42) B (43) C (44) B (45) A (46) D (47) A (48) C (49) D (50) B (51) B (52) A (53) C (54) A (55) B (56) D (57) D (58) C (59) B (60) B (61) B (62) C (63) B (64) A (65) A (66) B (67) D (68) C (69) C (70) D (71) D (72) B (73) C (74) B (75) A (76) C (77) C (78) B (79) A (80) C (81) C (82) D (83) B (84) B (85) D (86) (87) (88) (89) (90) (91)

Multiple Choice Questions in Science

To the visitors of blog

Thursday, March 6, 2014

Chapter 1 : INTRODUCTION TO NANOTECHNOLOGY

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Saturday, March 1, 2014

Chapter 2 : LIGHT : REFLECTION AND REFRACTION

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Friday, February 21, 2014

Chapter 3 : DISPERSION OF LIGHT AND NATURAL OPTICAL PHENOMENA

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Tuesday, January 7, 2014

Chapter 4 : ELECTRICITY

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Friday, December 27, 2013

Chapter 5 : MAGNETIC EFFECTS OF ELECTRIC CURRENT

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Friday, December 20, 2013

Chapter 6 : UNIVERSE

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Sunday, December 15, 2013

Chapter 7 : ACIDS, BASES AND SALTS

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