Physics MCQs For UPSC(NDA/NA) Exam
UPSC NDA/NA PHYSICS MCQ Q.1
When an optician prescribes a -5 D lens, what does it mean?
(a) concave lens of 20 cm focal length
(b) convex lens of 20 cm focal length
(c) concave lens of 5 cm focal length
(d) convex lens of 5 cm focal length
Ans.(b)
UPSC NDA/NA PHYSICS MCQ Q.2
If a substance is behaving as convex lens in air and concave lens in water, then which one of the following is its refractive index?
(a) smaller than air
(b) greater than both air and water
(c) greater than air but lesser than water
(d) almost equal to water
Ans.(b)
UPSC NDA/NA PHYSICS MCQ Q.3
The sun is visible a little before the actual sunrise because of which one of the following?
(a) atmospheric reflection
(b) atmospheric dispersion
(c) atmospheric diffraction
(d) atmospheric refraction
Ans.(d)
UPSC NDA/NA PHYSICS MCQ Q.4
DC current can be controlled by which one of the following components?
(a) impedance
(b) resistance
(c) capacitance
(d) inductance
Ans.(b)
UPSC NDA/NA PHYSICS MCQ Q.5
If the length of second's pendulum is increased by 2%, how many seconds will it loses per day?
(a) 3600 s
(b) 3456 s
(c) 1728 s
(d) 864 s
Ans.(d)
UPSC NDA/NA PHYSICS MCQ Q.6
A rubber ball dropped from 24 m height loses its kinetic energy by 25%. What is the height to which it rebounds?
(a) 6 m
(b) 12 m
(c) 18 m
(d) 24 m
Ans.(c)
UPSC NDA/NA PHYSICS MCQ Q.7
If the current is flowing through a 10 ohm resistor, then in which one of the following cases maximum heat will be generated?
(a) 5 A in 2 min
(b) 4 A in 3 min
(c) 3 A in 6 min
(d) 2 A in 12 min
Ans.(c)
UPSC NDA/NA PHYSICS MCQ Q.8
Why do two ice blocks join to form one block when pressed together?
(a) melting point of ice is lowered with increase in pressure
(b) melting point of ice increases with increase in pressure
(c) melting point of ice remains unchanged with increase in pressure
(d) melting point of ice is 0 degree C.
Ans.(b)
UPSC NDA/NA PHYSICS MCQ Q.9
The rating of an electric lamp is 110 V. To use it on 220 V, one will have to use which one of the following?
(a) Transistor
(b) Resistor
(c) Transformer
(d) Generator
Ans.(b)
UPSC NDA/NA PHYSICS MCQ Q.10
Consider the following statements
1. The focal length of the objective of a microscope is less than the focal length of the eyepiece
2. The minimum distance between an object and its real image formed by a convex lens of focal length f is equal to 4f.
Which of the statements given above is/are correct?
(a) only 1
(b) only 2
(c) both 1 and 2
(d) neither 1 nor 2
Ans.(c)
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