Physics MCQs For UPSC(NDA/NA) Exam
UPSC NDA/NA PHYSICS MCQ Q.1
A force F is applied on a body (which moves on a straight line ) for a duration of 3 s. The momentum of the body changes from 10 g cm/s to 40 g cm/s. The magnitude of the force F is -
(a) 10 dynes.
(b) 10 N.
(c) 120 dynes.
(d) 12 dynes.
Ans. (a)
It is given that p1 = 10 g cm/s
p2 = 40 g cm/s
Time t = 3 s
we know that , F = (p2 -p1)/t
F = (40-10)/3
= 30/3 dynes
= 10 dynes.
UPSC NDA/NA PHYSICS MCQ Q.2
Specific gravity of silver is 11 and specific gravity of iron is 8. Which one among the following is approximate relative density of silver with respect to iron?
(a) 1.4
(b) 0.7
(c) 3.0
(d) 2.8
Ans. (a)
Relative density of silver w.r.t. iron
= (specific gravity of silver) / (specific gravity of iron)
= 11/8
= 1.4
UPSC NDA/NA PHYSICS MCQ Q.3
A positively charged particle projected towards west is deflected towards north by a magnetic field is -
(a) towards South.
(b) towards East.
(c) in downward direction.
(d) in upward direction.
Ans. (d)
UPSC NDA/NA PHYSICS MCQ Q.4
An object is placed at the focus of a concave mirror. The image will be -
(a) real, inverted, same size at the focus.
(b) real, upright, same size at the focus.
(c) virtual, inverted, highly enlarged at infinity.
(d) real, inverted, highly enlarged at infinity.
Ans. (d)
UPSC NDA/NA PHYSICS MCQ Q.5
An optician prescribes a power = -0.5 diopter. The corresponding lens must be a -
(a) convex lens of focal length 2 m.
(b) convex lens of focal length 50 cm.
(c) concave lens of focal length 2 m.
(d) concave lens of focal length 50 cm.
Ans.(c)
It is given that
P = -0.5 diopter
F = 1/P
= 1/(-0.5)
= -2 m
Negative sign shows concave lens. It means it is a concave lens of focal length 2 m.
UPSC NDA/NA PHYSICS MCQ Q.6
A current I flows through a potential difference V in an electrical circuit containing a resistance R. The product of V and I i.e., VI may be understood as -
(a) resistance R.
(b) heat generated by the circuit.
(c) thermal power radiated by the circuit .
(d) rate of change of resistance.
Ans.(c)
P = VI.
It means thermal power radiated by the circuit.
UPSC NDA/NA PHYSICS MCQ Q.7
A particle is moving freely. Then its -
(a) kinetic energy is always greater than zero.
(b) potential energy is greater than zero and kinetic energy is less than zero.
(c) potential energy is less than zero and kinetic energy is greater than zero.
(d) potential energy is zero and kinetic energy is less than zero.
Ans.(a)
UPSC NDA/NA PHYSICS MCQ Q.8
Gravitational force shares a common feature with electromagnetic force. In both cases, the force is -
(a) between massive and neutral objects.
(b) between charged objects.
(c) a short range.
(d) a long range.
Ans.(a)
UPSC NDA/NA PHYSICS MCQ Q.9
The spread in colours in a rainbow on sky is primarily due to-
(a) dispersion of sunlight.
(b) reflection of sunlight.
(c) refraction of sunlight.
(d) total internal reflection of sunlight.
Ans. (b).
UPSC NDA/NA PHYSICS MCQ Q.10
SONAR is mostly used by -
(a) doctors.
(b) engineers.
(c) astronauts.
(d) navigators.
Ans.(d)
SONAR (originally an acronym for Sound Navigation and Ranging) is technique that uses sound propagation to navigate, communicate with or detect objects on or under the surface of the water, such a other vessels.
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