Physics MCQs For UPSC(NDA/NA) Exam
UPSC NDA/NA MCQ Q.1.
The weight of an object may be assigned using Newton's -
(a) first law of motion.
(b) second law of motion.
(c) third law of motion.
(d) laws of gravitation.
Ans. (d)
UPSC NDA/NA MCQ Q.2.
A piece of paper and a coin both having the same mass are dropped from the 10th floor of a building. The piece of paper would take more time to reach the ground because -
(a) gravitational pull on the paper is less than the coin.
(b) buoyant force on the piece of paper is more than that on the coin.
(c) buoyant force on the coin is more and acts in the downward direction.
(d) the piece of paper takes a longer path to reach the ground.
Ans. (b).
UPSC NDA/NA MCQ Q.3.
During sunrise and sunset, sun appears reddish-orange, because-
(a) during that time sun emits only reddish-orange light.
(b) all others colours are absorbed by the atmosphere.
(c) reddish-orange light is least scattered by the atmosphere.
(d) all other colours apart from reddish-orange are reflected back by the atmosphere.
Ans. (c)
UPSC NDA/NA MCQ Q.4.
A bullet of mass 20 g is fired in the horizontal direction with a velocity 150 m/s from a pistol of mass 1 kg. Recoil velocity of the pistol is -
(a) 3 m/s
(b) 3 km/s
(c) 300 m/s
(d) 1/3 m/s
Ans. (a).
UPSC NDA/NA MCQ Q.5.
Suppose, we have an iron nail and an iron ball of same mass. When submerged in water, the iron ball may float, but the nail always sinks. This is because -
(a) buoyant force on the ball is larger than that of the nail due to their shapes.
(b) viscous force on the ball is higher.
(c) viscous force on the nail is higher.
(d) gravitational force affects the ball differently from the nail.
Ans. (a).
UPSC NDA/NA MCQ Q.6.
An electric heater is rated 1500 W, electric power costs Rs.2 per kilo-watt-hour, then the cost of power for 10 h running the heater is -
(a) Rs.30
(b) Rs.15
(c) Rs.150
(d) Rs.25
Ans. (a)
Power of electric heater (p) = 1500 W
1 unit = 1 kWh
= 1.5*1
= 1.5 unit
For 10 h
The unit will be = 1.5 * 10 = 15 unit.
Cost of 1 unit = Rs.2
Cost of 15 unit = Rs.2 * 15
= Rs.30
UPSC NDA/NA MCQ Q.7.
Bats can know about their prey at a distance even in the night by emitting -
(a) infra-red lights.
(b) ultraviolet lights.
(c) chemicals from their body.
(d) ultrasonic sounds.
Ans. (d)
UPSC NDA/NA MCQ Q.8.
White light while passing through a glass prism breaks up into light of different colours because -
(a) refractive index of glass for different colours of light is different.
(b) glass prism absorbs white light and emits lights of several colours in different direction.
(c) of total internal reflection of white light of surfaces of the prism.
(d) of the interference of different colours inside the prism.
Ans. (A)
UPSC NDA/NA MCQ Q.9.
When long dry hair is brushed the strands often move away from each other because while brushing -
(a) air is being blown through the strands.
(b) static electric charges are being induced on the hair.
(c) mechanical energy is being transferred into heat energy.
(d) the gravitational attraction among the strands becomes smaller.
Ans.(b)
UPSC NDA/NA MCQ Q.10.
A pressure cooker works on the principle of -
(a) elevation of boiling point of water by application of pressure.
(b) making the food grains softer by application of pressure.
(c) making the foos grains softer by application of pressure and temperature.
(d) keeping the food grains inside steam for a longer time.
Ans.(a)
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