PHYSICS MCQs For UPSC(NDA/NA) Exam
UPSC NDA/NA MCQ Q.1.
A beautiful rainbow on the sky is due to the-(a) dispersion of sunlight from a water droplet only.
(b) feflection of sunlight from a water droplet only.
(c) reflection and refraction of sunlight from a water droplet only.
(d) refraction, dispersion and reflection of sunlight from a water droplet.
ANS (d)
UPSC NDA/NA MCQ Q.2.
A current of 0.5 A is drawn by a filament of an electric bulb for 20 min. The amount electric charge that flows through the circuit is -(a) 1C
(b) 10C
(c) 600C
(d) 300C
ANS- (c)
Here current (I) = 0.5 A
Time (t) = 20 min = 20*60 = 1200 sec
We know that,
Charge (Q) = I*t
= 0.5*1200
= 600 C.
UPSC NDA/NA MCQ Q.3.
Which one among the following properties of a proton may change , while it moves freely in a magnetic field?
(a) speed.
(b) charge.
(c) mass.
(d) velocity.
Ans. (d)
Proton move in circle and velocity change as its direction change.
UPSC NDA/NA MCQ Q.4.
Power required by a boy of mass 30 kg to run up a staircase of 40 steps in 10 s is-(Height of each step is 15 cm)
(Take, g = 10 m/s^2)
(a) 1800 W
(b) 180 W
(c) 18000 W
(d) 18 W
Ans. (b)
p = W/t
= mgh/t
= (30*10*40*0.15)/10
=180 W.
UPSC NDA/NA MCQ Q.5.
Ohm's law can also be taken as a statement for -(a) conservation of energy.
(b) conservation of electric charge.
(c) conservation of angular momentum.
(d) non-conservation of momentum of the following charges.
Ans. (a)
UPSC NDA/NA MCQ Q.6.
Motion of a particle can be described in x-direction by x = a sin wt and y-direction by y = b cos wt. The particle is moving on -(a) a circular path of radious a.
(b) a circular path of radious b.
(c) an elliptical path.
(d) a straight line.
Ans. (c)
UPSC NDA/NA MCQ Q.7.
The ceilings of e concert hall are generally curved-(a) because they reflect the sound of the audience.
(b) because they can obsorb noise.
(c) to have better aeration in the hall.
(d) as any sound from outside cannot pass through a curved ceiling.
Ans. (a).
The ceilings of a concert hall are generally curved. This is because sound waves transmitted by the source in big halls is absorbed by the walls, floor, seats and even by the clothes of the crowd sitting inside the hall.
Hence, the ceiling of halls are curved to reduce this problem. Sound gets reflected by the curved shape of the ceiling, so that sound reaches to the every points in the hall uniformly.
UPSC NDA/NA MCQ Q.8.
Rays of light get refracted while passing from air to glass because-(a) density of glass is higher than that of air.
(b) they cannot be reflected from a glass surface.
(c) glass absorbs energy from the light rays.
(d) speed of light in glass is less than the speed of light in air.
Ans. (a).
UPSC NDA/NA MCQ Q.9.
If the length of simple pendulum is being increased by 4 fold, time period of oscillation will be-(a) decreased by 4-fold.
(b) increased by 4-fold.
(c) decreased to half of the initial value.
(d) increased by a factor of 2 of its initial value.
Ans. (d)
UPSC NDA/NA MCQ Q.10.
The presence of sulphur in gunpowder-(a) decreases the ignition temperature.
(b) increases the final temperature.
(c) increases explosiveness of the gunpowder.
(d) makes the powder smokeless.
Ans.(a).
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