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

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Question 1318

Question

MCQ▾

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 1319

Question

MCQ▾

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 1320

Question

MCQ▾

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 1321

Question

MCQ▾

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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