Physics MCQs For UPSC(NDA/NA) Exam
UPSC NDA/NA PHYSICS MCQ Q.1
A man is sitting on a rotating stool with his arms outstretched. If suddenly he folds his arms the angular velocity of the man would
(a) increase
(b) decrease
(c) become zero
(d) remain constant
Ans.(a)
UPSC NDA/NA PHYSICS MCQ Q.2
For a particle revolving in a circular path , the acceleration of the particle is
(a) along the tangent
(b) along the radius
(c) zero
(d) along the circumference of the circle
Ans.(b)
UPSC NDA/NA PHYSICS MCQ Q.3
Internet communication uses optical fibre cables because of
(a) low cost
(b) free from virus threat
(c) high data carrying capacity
(d) faster than light communication of signals
Ans.(c)
UPSC NDA/NA PHYSICS MCQ Q.4
A heavy ball is suspended as shown in the below figure.
A quick jerk on the lower string will break that string but a slow pull on the lower string will break the upper string. The first result occurs because
(a) the force is too small to move the ball
(b) air friction holds the ball back
(c) of action and reaction
(d) the ball has inertia
Ans.(a)
UPSC NDA/NA PHYSICS MCQ Q.5
The visible light has a wavelength range from about 380 nm (violet) to 780 nm (red). If an excited object emits light with wavelength of 15 nm, to which one of the following ranges does it belongs?
(a) X-ray
(b) Gamma ray
(c) Infrared
(d) Ultraviolet
Ans.(a)
UPSC NDA/NA PHYSICS MCQ Q.6
Microwave oven consumes less power due to
(a) small frequency of radiation
(b) short wavelength of radiation
(c) large frequency as well as wavelength of radiation
(d) small frequency as well as wavelength of radiation
Ans.(b)
UPSC NDA/NA PHYSICS MCQ Q.7
The sun is constantly radiating energy and yet its surface temperature is nearly constant at 6000°C. The constancy of solar temperature is due to
(a) fission
(b) radioactivity
(c) fusion
(d) black hole evaporation
Ans.(c)
UPSC NDA/NA PHYSICS MCQ Q.8
An annual solar eclipse occurred during January 2010 with duration of annularity around 12 min. It is predicted that such long annular duration will not occur till the year 3043. such prediction is possible due to
(a) Einstein's theory of relativity
(b) Darwin's theory of natural selection
(c) Newton's theory of gravitation
(d) Hawking's theory of black hole
Ans.(c)
UPSC NDA/NA PHYSICS MCQ Q.9
Metal pipes used to carry water sometimes burst in the winter. This is because
(a) water expands when it freezes
(b) metal contracts more than water
(c) outside of the pipe contracts more than inside
(d) metal expands more than water
Ans.(b)
UPSC NDA/NA PHYSICS MCQ Q.10
A body is at rest on the surface of the earth. Which one among the following statements is correct regarding this?
(a) no force is acting on the body
(b) only weight of the body acts on it
(c) net downward force is equal to the net upward force
(d) none of the above
Ans.(c )
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