Physics MCQs For UPSC(NDA/NA) Exam
UPSC NDA/NA PHYSICS MCQ Q.1
Which one among the following is the correct value of the gravitational force of the Earth acting on a body of mass 1 kg?
(A) 8.9 N
(B) 9.8 N
(C) 89 N
(D) 98 N
Ans.(B)
UPSC NDA/NA PHYSICS MCQ Q.2
A neutral (unchanged) metal ball is suspended using a non-magnetic string. A positively charged insulating rod is placed near the ball which is observed to be attracted to the rod. This is because
(A) the ball becomes positively charged by induction
(B) the ball becomes negatively charged by induction
(C) there is a rearrangement of the electrons in the ball
(D) the number of electrons in the ball is more than the number of electrons on the rod
Ans.(C)
UPSC NDA/NA PHYSICS MCQ Q.3
It is impossible for two oscillators, each executing simple harmonic motion, to remain in phase with each other if they have different
(A) time periods
(B) amplitudes
(C) spring constants
(D) kinetic energy
Ans.(B)
UPSC NDA/NA PHYSICS MCQ Q.4
Protons and neutrons are bound in a nucleus by the
(A) short range weak interaction
(B) short range strong interaction
(C) long range electromagnetic interaction
(D) long range gravitational interaction
Ans.(B)
UPSC NDA/NA PHYSICS MCQ Q.5
refractive index of an optical medium changes with
1. the nature of the medium.
2. The change is the angle of incidence of the ray.
3. Color of the incident ray.
Select the correct answer using the codes given below
(A) 1 and 3
(B) 2 and 3
(C) 1 and 2
(D) All of these
Ans.(D)
UPSC NDA/NA PHYSICS MCQ Q.6
A one rupee coin is placed at the bottom of a vessel. Water is then poured into the vessel such that the depth of water becomes 20 cm. If water has refractive index 4/3, the coin would be seen at a depth of
(A) 20 cm
(B) about 26 cm
(C) 15 cm
(D) 25 cm
Ans.(C)
UPSC NDA/NA PHYSICS MCQ Q.7
Momentum of a body is
1. a vector quantity
2. a conserved quantity in an isolated system.
3. same as force in linear motion.
Select the correct answer using the codes given bellow
(A) 1 and 3
(B) 2 and 3
(C) 1 and 2
(D) all of these
Ans.(C)
UPSC NDA/NA PHYSICS MCQ Q.8
If the ratio of the weight of a man is stationary lift and when it is moving downloads with uniform acceleration is 3:2, then the value of A is
(A) 3g/2
(B) g/3
(C) g
(D) 2g/3
Ans.(B)
UPSC NDA/NA PHYSICS MCQ Q.9
Ultrasonic waves are those sound waves having frequency
(A) between 20 Hz and 1000 Hz
(B) between 1000 Hz and 20000 Hz
(C) more than 20 kHz
(D) less than 20 Hz
Ans.(C)
UPSC NDA/NA PHYSICS MCQ Q.10
Thermometers A and B have ice points marked at 15° and 25° and stream points at 75° and 125°, respectively. When thermometer A measures the temperature of a bath 60° , the reading of B for the same bath is
(A) 60°
(B) 75°
(C) 90°
(D) 100°
Ans.(D)
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