Multiple Choice Questions in Science: 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

Multiple Choice Questions in Science

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Friday, February 21, 2014

Chapter 3 : DISPERSION OF LIGHT AND NATURAL OPTICAL PHENOMENA

CHOOSE APPROPRIATE ALTERNATIVE

ANSWERS

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