[MCQ]Physics MCQs For UPSC(NDA/NA) Exam, SET 4||DEB STUDY

PHYSICS OBJECTIVE Q&A FOR UPSC(NDA/NA) Exam

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For Set 3 Questions click here.
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UPSC NDA/NA PHYSICS MCQ Q.1

Two similarly charged bodies are kept  5 cm apart in air. If the second body is shifted away from the first by another 5 cm,their force of repulsion will be



(A) doubled
(B) halved
(C) quadrupled
(D) reduced to one-fourth


Ans.(D)

UPSC NDA/NA PHYSICS MCQ Q.2

For which among the following house appliances,magnet is an essential part?

(A) calling bell
(B) fan
(C) washing machine
(D) all of these


Ans.(D)

UPSC NDA/NA PHYSICS MCQ Q.3

To obtain the powerful parallel beams of light from a vehicle's headlight,one must use

(A) front surface silvered plane mirror
(B) back surface silvered plane mirror
(C) concave mirror
(D) convex mirror


Ans.(C)

UPSC NDA/NA PHYSICS MCQ Q.4

Which one among the following is not produced by sound waves in air?

(A) polarisation
(B) diffraction
(C) reflection
(D) refraction


Ans.(A)

UPSC NDA/NA PHYSICS MCQ Q.5

A body attached to a spring balance weights 10 kg on the Earth. The body attached to the same spring balance is taken to a planet where gravity is half that of the Earth. The spring balance will read

(A) 20 kg
(B) 10 kg
(C) 5 kg
(D) 2.5 kg


Ans.(C)

UPSC NDA/NA PHYSICS MCQ Q.6

If the focal lenght of the biconvex lens is 25 cm,then the power of the lens will be

(A) +4 D
(B) -4 D
(C) +0.04 D
(D) +0.04 D


Ans.(A)

UPSC NDA/NA PHYSICS MCQ Q.7

The thermal conductivity of copper is 4 times that of brass. Two rods of copper and brass having same lenght and cross-section are joined end to end. The free end of copper is at 0°C and the free end of brass is at 100°C. The temperature of the junction is

(A) 20° C
(B) 40°C
(C) 60° C
(D) 10° C


Ans.( A)

UPSC NDA/NA PHYSICS MCQ Q.8

The torque on a rectangular coil placed in a uniform magnetic field is large when the

(A) number of turns is large
(B) number of turns is less
(C) plane of the coil is perpendicular to the magnetic field
(D) area of the coil is small


Ans.(A)

UPSC NDA/NA PHYSICS MCQ Q.9

Two thin convex lenses of focal lengths 4 cm and 8 cm are separated by a distance of 4 cm in air. The combination will have the focal
(A) 4 cm
(B) 8 cm
(C) 12 cm
(D) 32 cm


Ans.(A)

UPSC NDA/NA PHYSICS MCQ Q.10

Two metallic wires A and B are of same material and have equal length. If the cross-sectional area of B is double that of A,then which one among the following is the electrical resistance of B?

(A) twice that of A
(B) 4 times that of A
(C) 1/4 that of A
(D) 1/2 that of A


Ans.( D)

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