Physics MCQs For UPSC(NDA/NA) Exam
UPSC NDA/NA PHYSICS MCQ Q.1
Which one among the following statements is not correct?
(A) in progressive waves, the amplitude may be constant and neighbouring points are out of phase with each other
(B) in air or other gases, a progressive antinode occurs at a displacement node and a progressive node occurs at a displacement antinode
(C) transverse wave can be polarised while longitudinal wave can not be polarised
(D) longitudinal wave can be polarised while transverse wave can not be polarised
Ans.(D)
UPSC NDA/NA PHYSICS MCQ Q.2
A jet plane flies through air with a velocity of 2 Mach. While the velocity of sound is 332 m/s, the air speed of the plane is
(A) 166 m/s
(B) 66.4 km/s
(C) 332 m/s
(D) 664 m/s
Ans.(D)
UPSC NDA/NA PHYSICS MCQ Q.3
Which one among the following statements is correct?
(A) convex mirrors are used by doctors to examine oral cavity
(B) concave mirrors are used as reflectors
(C) convex mirrors are used as reflectors
(D) convex mirrors should be used for shaving
Ans.(B)
UPSC NDA/NA PHYSICS MCQ Q.4
Light travels in optical fiber irrespective of its shape because it is a device by which signals can be transferred from one location to another. It is based on the phenomenon of
(A) diffraction of light
(B) refraction of light
(C) polarization of light
(D) total internal reflection of light
Ans.(D)
UPSC NDA/NA PHYSICS MCQ Q.5
A man is at rest in the middle of a horizontal plane of perfectly smooth surface of ice. He can move himself to the shore by making use of Newton's
(A) first law of motion
(B) second law of motion
(C) third law of motion
(D) first, second and third laws of motion
Ans.(C)
UPSC NDA/NA PHYSICS MCQ Q.6
Which one among the following is major cause of blurring and unsharp images of objects observed through very large telescope at the extreme limit of magnification?
(a) Air turbulence of earth’s atmosphere
(b)Poor optical polish achievable on large mirrors.
(c)Poor tracking capacities of telescopes
(d)Varying density of air in the Earth’s atmosphere
Ans.(a)
UPSC NDA/NA PHYSICS MCQ Q.7
When a moving bus suddenly applies brakes, the passengers sitting in it fall in the forward direction. This can be explained by
(a)The theory of relativity
(b)Newton’s first law
(c)Newton’s second law
(d)Newton’s third law
Ans. (b)
UPSC NDA/NA PHYSICS MCQ Q.8
The material used for electric fuse is an alloy of tin and lead. This alloy should have
(a)High specific resistance and low melting point
(b)Low specific resistance and high melting point
(c)Low specific resistance and low melting point
(d)High specific resistance and high melting point
Ans.(a)
UPSC NDA/NA PHYSICS MCQ Q.9
Suppose you are standing 1m in front of a plane mirror. What should be the minimum vertical size of the mirror so that you can see your full image in it?
(a)0.50 m
(b)2m
(c)Half of your height
(d)Twice of your height
Ans.(c)
UPSC NDA/NA PHYSICS MCQ Q.10
Light travels slower in glass than in air because
(a)Refractive index of air is less than that of glass
(b)Refractive index of air is greater than that of glass
(c)Density of glass is greater than that of air
(d)Density of glass is less than that of air
Ans.(a)
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