NSTSE (National Science Talent Search Exam- Unified Council) Class 10: Questions 1318 - 1321 of 1484

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Question number: 1318

» Physics » Human Eye and World

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MCQ▾

Question

A phenomenon, where the brain continues to sense the image, even after the object has been removed, is called:

Choices

Choice (4) Response

a.

Dispersion of vision

b.

Persistence of vision

c.

Scattering vision

d.

Question does not provide sufficient data or is vague

Question number: 1319

» Physics » Human Eye and World

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MCQ▾

Question

The sunlight is predominantly a mixture of –

Choices

Choice (4) Response

a.

7 visible colours

b.

5 visible colours

c.

6 visible colours

d.

None of the above

Question number: 1320

» Physics » Human Eye and World

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MCQ▾

Question

How does an eye focus the objects lying at various distances?

Choices

Choice (4) Response

a.

By changing the focal length of its lens

b.

The focal length of the eye-lens is changed by the action of the ciliary muscles

c.

Both a. and b. are correct

d.

None of the above

Question number: 1321

» Physics » Human Eye and World

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MCQ▾

Question

Which of the following is/are correct about the short-sighted and long-sighted?

I. People who are long-sighted are unable to reading and short-sighted person causes problems with focusing on distant object

II. Long-sighted people should wear concave lenses and short-sighted people should wear convex lenses

III. Eye lens are too thick in long-sighted and eye lens are too thin in short-sighted

IV. In long-sighted, image form behind retina and in short-sighted, image form in front of retina

Choices

Choice (4) Response

a.

I and IV only II and III only

b.

I and IV only

c.

I, III and IV only

d.

I, II and III only

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