Physics - Questions and Answers, General Study (GK)

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271.

Which among the following materials were used for minting coins during the rule of the mauryas?

(a)Gold and Silver

(b)Silver and Copper

(c)Copper and Bronze

(d)Gold and Copper

Comment

Answer is: BNA

272.

Which one of the following reflects back more sunlight as compared to other three?

(a)sand desert

(b)paddy crop lan

(c)land covered with fresh snow

(d)prairie land

Comment

Answer is: CNA

273.

Which one among the following has the highest energy?

(a)Blue light

(b)Green light

(c)Red light

(d)Yellow light

Comment

Answer is: ANA

274.

The head mirror used by ENT doctors is

(a)concave

(b)convex

(c)plane

(d)planoconvex

Comment

Answer is: ANA

275.

A laser beam is always

(a)a convergent beam

(b)a divergent beam

(c)a parallel beam

(d)divergent to start with and parallel later on

Comment

Answer is: CNA

276.

The focal length of the lens in a photographic camera is 5 cm. What is the power of the lens?

(a)+ 5 D

(b)+ 10 D

(c)+ 15 D

(d)+ 20 D

Comment

Answer is: DNA

277.

The image formed on the retina of a human eye is

(a)virtual and inverted

(b)virtual and erect

(c)real and erect

(d)real and inverted

Comment

Answer is: DNA

278.

A lens, immersed in a liquid becomes invisible when

(a)the focal length of the lens is zero

(b)the focal length of the lens is infinite

(c)the refractive index of the lens is less than the refractive index of the liquid

(d)the refractive index of the lens is equal to the refractive

Comment

Answer is: DNA

279.

The magnifying power of a telescope can be increased by

(a)reducing the focal length of the eye piece

(b)increasing the diameter of the objective

(c)reducing the focal length of the objective

(d)increasing the diameter of the eyepiece

Comment

Answer is: ANA

280.

An object is kept 5 cm in front of a concave mirror of focal length 15 cm. What will be the nature of the image?

(a)virtual, not magnified

(b)virtual, magnified

(c)real, not magnified

(d)real, magnified

Comment

Answer is: BNA

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Physics - Questions and AnswersPage 28

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