NSTSE (National Science Talent Search Exam- Unified Council) Class 10: Questions 1322 - 1325 of 1484

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Question number: 1322

» Physics » Human Eye and World

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Question

Why traffic signals are red in colour, when the eye is most sensitive to yellow-green?

I. Red light is scattered the least by air molecules

II. Red light is able to travel the longest distance through fog, rain, and the alike

III. Red light do not get scattered and power full parallel rays can reach the driver’s eye

Which of the following is/are correct?

Choices

Choice (4) Response

a.

III only

b.

II and III only

c.

I, II and III only

d.

I and II only

Question number: 1323

» Physics » Human Eye and World

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Question

Which of the following are caused the myopia in human beings?

I. Contraction of the length of the eyeball

II. Increase of the length of the eyeball

III. Shortening of the focal length of the eye lens

IV. The focal length of the eye lens becomes too large

Choices

Choice (4) Response

a.

II and III only

b.

I, III and IV only

c.

I and III only

d.

I, II and IV only

Question number: 1324

» Physics » Human Eye and World

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Question

Which colour of light has the maximum velocity in the glass prism?

Choices

Choice (4) Response

a.

Red

b.

Violet

c.

Blue

d.

Green

Question number: 1325

» Physics » Human Eye and World

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Question

A long sighted person has a minimum distance of distinct vision of 75 cm. he wants to reduce it to 50 cm. he should use a

Choices

Choice (4) Response

a.

Concave lens of focal length 30 cm

b.

Concave lens of focal length 150 cm

c.

Convex lens of focal length 150 cm

d.

Convex lens of focal length 30 cm

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