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Question (41)

QN0036362

A rainbow is seen when sunlight interacts with tiny water droplets. Which sequence best describes the major processes involved?

(A) Reflection only
(B) Refraction, dispersion, internal reflection and refraction
(C) Scattering only
(D) Diffraction followed by reflection only

Correct Answer: B

Explanation:

Water droplets refract and disperse sunlight, internally reflect it, and refract it again while emerging.

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Question (42)

QN0036363

If the Sun is behind an observer and there are suitable water droplets in front, a rainbow can be observed because it is formed:

(A) In the direction of the Sun
(B) Opposite to the Sun
(C) Directly above the observer only
(D) Inside the Sun

Correct Answer: B

Explanation:

A rainbow is formed in a direction opposite to the Sun.

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Question (43)

QN0036364

A person looks at an object through hot air rising above a fire and observes that the object appears to waver. This happens because:

(A) The object is physically moving
(B) The refractive conditions of the air keep changing
(C) The light undergoes dispersion only
(D) The air completely absorbs the light

Correct Answer: B

Explanation:

Changing refractive conditions of hot and cool air cause the apparent position of the object to fluctuate.

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Question (44)

QN0036365

A star appears slightly higher than its actual position when viewed near the horizon mainly because of:

(A) Dispersion
(B) Atmospheric refraction
(C) Scattering by clouds
(D) Reflection from the ground

Correct Answer: B

Explanation:

Atmospheric refraction causes the apparent position of a star to differ from its actual position.

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Question (45)

QN0036366

Stars appear to twinkle, whereas planets generally do not, mainly because planets:

(A) Do not emit light
(B) Are much closer and appear as extended sources
(C) Have no atmosphere
(D) Are always below the horizon

Correct Answer: B

Explanation:

Planets appear as extended sources, so variations from different parts tend to average out.

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Question (46)

QN0036367

The Sun can be seen for about two minutes after actual sunset mainly because of:

(A) Dispersion
(B) Atmospheric refraction
(C) Scattering by dust
(D) Reflection from clouds

Correct Answer: B

Explanation:

Atmospheric refraction makes the apparent position of the Sun higher than its actual position.

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Question (47)

QN0036368

The apparent flattening of the Sun's disc near sunrise and sunset is associated with:

(A) Atmospheric refraction
(B) Dispersion by a prism
(C) Tyndall effect
(D) Reflection from oceans

Correct Answer: A

Explanation:

Atmospheric refraction causes the apparent flattening of the Sun's disc at sunrise and sunset.

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Question (48)

QN0036369

A beam of sunlight becomes visible when it passes through a smoke-filled room. This is an example of:

(A) Dispersion
(B) Tyndall effect
(C) Accommodation
(D) Total internal reflection

Correct Answer: B

Explanation:

Scattering of light by fine particles in a colloidal medium produces the Tyndall effect.

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Question (49)

QN0036370

If the scattering particles in the atmosphere are very fine, which colour is scattered more strongly according to the chapter?

(A) Red
(B) Orange
(C) Blue
(D) Yellow

Correct Answer: C

Explanation:

Very fine particles scatter shorter wavelengths, especially blue light, more strongly.

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Question (50)

QN0036371

Suppose Earth's atmosphere contained no scattering particles. How would the sky appear to an observer?

(A) Bright blue
(B) Red
(C) Dark
(D) Green

Correct Answer: C

Explanation:

Without scattering particles, sunlight would not be scattered and the sky would appear dark.

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Question (41)

A rainbow is seen when sunlight interacts with tiny water droplets. Which sequence best describes the major processes involved?

Explanation:

Link:

Question (42)

If the Sun is behind an observer and there are suitable water droplets in front, a rainbow can be observed because it is formed:

Explanation:

Link:

Question (43)

A person looks at an object through hot air rising above a fire and observes that the object appears to waver. This happens because:

Explanation:

Link:

Question (44)

A star appears slightly higher than its actual position when viewed near the horizon mainly because of:

Explanation:

Link:

Question (45)

Stars appear to twinkle, whereas planets generally do not, mainly because planets:

Explanation:

Link:

Question (46)

The Sun can be seen for about two minutes after actual sunset mainly because of:

Explanation:

Link:

Question (47)

The apparent flattening of the Sun's disc near sunrise and sunset is associated with:

Explanation:

Link:

Question (48)

A beam of sunlight becomes visible when it passes through a smoke-filled room. This is an example of:

Explanation:

Link:

Question (49)

If the scattering particles in the atmosphere are very fine, which colour is scattered more strongly according to the chapter?

Explanation:

Link:

Question (50)

Suppose Earth's atmosphere contained no scattering particles. How would the sky appear to an observer?

Explanation:

Link:

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