Multiple Choice Questions in Science: 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

Multiple Choice Questions in Science

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Saturday, March 1, 2014

Chapter 2 : LIGHT : REFLECTION AND REFRACTION

Choose Appropriate Alternative

ANSWERS

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