Quiz 05 – APS Physics

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Passing percentage = 60%

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Colorful World

1 / 10

Stars twinkle while planets do not twinkle. This is due to

stars are much bigger in size than planets.

planets are closer to earth than stars and thus appear as extended objects and can be considered as a collection of point sources. The total variation in the amount of light entering our eye from all the individual point-sized sources will average out to zero

Planets are smaller than stars and thus appear as point objects. The total variation in the amount of light entering our eye from the point-sized objects will average out to zero.

planets are much bigger in size than stars.

2 / 10

The clear sky appears blue because

ultraviolet radiations are absorbed in the atmosphere.

blue light gets absorbed in the atmosphere.

light of all other colours is scattered more than the violet and blue colour lights by the atmosphere.

violet and blue lights get scattered more than lights of all other colours by the atmosphere.

3 / 10

Reason behind advance sunrise and delayed sunset

total internal reflection

reflection

dispersion

atmospheric refraction

4 / 10

A beam of white light produces spectrum on passing through a glass prism in a dark room. The correct reason for this is:

Different colours of white light travel with different speed inside the glass prism.

Different colours of white light travel with same speed inside the glass prism.

Red light travel slowest inside the glass prism.

Red light is scattered least inside the glass prism.

5 / 10

After tracing the path of a ray of light through a glass prism a student marked the angle of incidence (∠i), angle of refraction (∠r), angle of emergence (∠e) and the angle of deviation (∠D) as shown in the diagram. The correctly marked angles are:

∠i, ∠e and ∠D

∠i, ∠r and ∠e

∠i and ∠r

∠i and ∠e

6 / 10

The path of the sunlight becomes visible when it passes through a canopy of dense forest. This phenomenon is known as

Refraction of light by canopy of dense forest

Dispersion of light

Tyndall's effect

Reflection of light

7 / 10

The sky looks dark and black instead of blue in outer space. The is due to….

The colour of the sky in outer space is painted black by nature.

maximum scattering of light occurred in outer space

There is no atmosphere in outer space and thus no scattering of light occurs.

Dispersion does not occur in outer space and hence the sky in outer space has no colour.

8 / 10

Which phenomenon of light is depicted in the following diagram?

Dispersion of white light

Scattering of light

Atmospheric refraction by glass prism

Internal reflection

9 / 10

What is the correct order of the phenomenon involved in the formation of a rainbow?

Refraction, dispersion and internal reflection

Reflection, refraction and dispersion

Refraction, scattering and internal reflection

Dispersion, scattering and internal reflection

10 / 10

Danger signals are red in colour. The correct reason is…..

Red colours is scattered least by fog or smoke.

Red is the colour of blood therefore red is the best colour suitable for danger signals.

Red colour travels faster than all other colours.

Red colour has the shortest wavelength.

The average score is 59%

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