Physics - Questions and Answers, General Study (GK)

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281.

Different objects at different distances are seen by the eye. The parameter that remains constant is

(a)the focal length of the eye lens

(b)the object distance from the eye lens

(c)the radii of curvature of the eye lens

(d)the image distance from the eye lens

Comment

Answer is: DNA

282.

How far must a girl stand in front of a concave spherical mirror of radius 120 cm to see an erect image of her face, four times its natural size?

(a)40 cm from the mirror

(b)45 cm from the mirror

(d)55 cm from the mirror

Comment

Answer is: BNA

283.

Cylindrical lens is used by a person suffering from

(a)astigmatism

(b)myopia

(c)hypermetropia

(d)presbyopia

Comment

Answer is: ANA

284.

The power of lens is – 2 D. What is its focal length?

(a)2 m

(b)1.5 m

(d)0.5 m

Comment

Answer is: DNA

285.

Consider the following statements
1. Light waves can travel in vacuum
2. Light waves can be refracted
3. Light waves are electromagnetic
Which of the statements given above are correct?

(a)1, 2 and 3

(b)2 and 3

(d)1 and 2

Comment

Answer is: ANA

286.

Diffusion of light in the atmosphere takes place due to

(a)carbon dioxide

(b)dust particles

(c)helium

(d)water vapours

Comment

Answer is: BNA

287.

To which one of the following process is the term CMYK related?

(a)railway signaling

(b)navigation

(c)offset printing

(d)electronic voting machine

Comment

Answer is: CNA

288.

Which of the following types of light are strongly absorbed by plants?

(a)Violet and orange

(b)Blue and red

(c)Indigo and yellow

(d)Yellow and violet

Comment

Answer is: BNA

289.

Which one of the following types of waves are used in a night vision apparatus?

(a)Radio waves

(b)Microwaves

(c)Infrared waves

(d)none of these

Comment

Answer is: CNA

290.

Which one of the following phenomena cannot be attributed to the refraction of light?

(a)Twinkling of stars

(b)Mirage

(c)Rainbow

(d)Redshift

Comment

Answer is: DNA

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Physics - Questions and AnswersPage 29

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