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Question (11)

QN0036332

The splitting of white light into its component colours is called:

(A) Reflection
(B) Refraction
(C) Dispersion
(D) Accommodation

Correct Answer: C

Explanation:

Dispersion is the splitting of white light into its component colours.

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Question (12)

QN0036333

Which colour of visible light bends the least through a glass prism?

(A) Violet
(B) Blue
(C) Green
(D) Red

Correct Answer: D

Explanation:

Red light bends the least through a glass prism.

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Question (13)

QN0036334

Which colour bends the most when white light passes through a glass prism?

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

Correct Answer: C

Explanation:

Violet light bends the most through a glass prism.

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Question (14)

QN0036335

The natural spectrum formed in the sky after rain is called:

(A) Mirage
(B) Rainbow
(C) Tyndall effect
(D) Scattering

Correct Answer: B

Explanation:

A rainbow is a natural spectrum produced by dispersion of sunlight by water droplets.

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Question (15)

QN0036336

The blue colour of the clear sky is mainly due to:

(A) Reflection of blue light from oceans
(B) Dispersion by clouds
(C) Scattering of shorter wavelengths
(D) Refraction by water vapour

Correct Answer: C

Explanation:

Fine particles in the atmosphere scatter shorter wavelengths, especially blue light, more strongly.

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Question (16)

QN0036337

A normal eye is able to see objects clearly from 25 cm to infinity. If an object is moved from 1 m to 50 cm, which ability of the eye mainly helps it focus the object clearly?

(A) Dispersion
(B) Accommodation
(C) Atmospheric refraction
(D) Scattering

Correct Answer: B

Explanation:

Accommodation changes the focal length of the eye lens to focus objects at different distances.

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Question (17)

QN0036338

When a person shifts attention from a distant object to a nearby object, the ciliary muscles:

(A) Relax and lens becomes thinner
(B) Contract and lens becomes thicker
(C) Relax and focal length decreases
(D) Stop functioning completely

Correct Answer: B

Explanation:

For nearby objects, ciliary muscles contract, making the lens thicker and decreasing its focal length.

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Question (18)

QN0036339

When the ciliary muscles of a normal eye are relaxed, the eye lens becomes:

(A) Thicker and its focal length decreases
(B) Thinner and its focal length increases
(C) Thicker and its focal length increases
(D) Flat and its focal length becomes zero

Correct Answer: B

Explanation:

Relaxed ciliary muscles make the lens thinner and increase its focal length.

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Question (19)

QN0036340

A student can read a book comfortably at 25 cm but cannot clearly read a very distant blackboard. Which defect is most likely present?

(A) Hypermetropia
(B) Myopia
(C) Presbyopia only
(D) Cataract

Correct Answer: B

Explanation:

Myopia allows clear vision of nearby objects but not distant objects.

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Question (20)

QN0036341

A person can see distant objects clearly but needs to hold a book much farther than 25 cm to read it comfortably. The person most likely has:

(A) Myopia
(B) Hypermetropia
(C) Normal vision
(D) Cataract

Correct Answer: B

Explanation:

In hypermetropia, the near point is farther than 25 cm.

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Question (11)

The splitting of white light into its component colours is called:

Explanation:

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Question (12)

Which colour of visible light bends the least through a glass prism?

Explanation:

Link:

Question (13)

Which colour bends the most when white light passes through a glass prism?

Explanation:

Link:

Question (14)

The natural spectrum formed in the sky after rain is called:

Explanation:

Link:

Question (15)

The blue colour of the clear sky is mainly due to:

Explanation:

Link:

Question (16)

A normal eye is able to see objects clearly from 25 cm to infinity. If an object is moved from 1 m to 50 cm, which ability of the eye mainly helps it focus the object clearly?

Explanation:

Link:

Question (17)

When a person shifts attention from a distant object to a nearby object, the ciliary muscles:

Explanation:

Link:

Question (18)

When the ciliary muscles of a normal eye are relaxed, the eye lens becomes:

Explanation:

Link:

Question (19)

A student can read a book comfortably at 25 cm but cannot clearly read a very distant blackboard. Which defect is most likely present?

Explanation:

Link:

Question (20)

A person can see distant objects clearly but needs to hold a book much farther than 25 cm to read it comfortably. The person most likely has:

Explanation:

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