Objective physics Questions for UPSC

Objective physics Questions for UPSC
UPSC Exam material Physics objective questions and answers
Free online Physics practice tests: Solved UPSC Physics Question
1. The flowing water of a river possesses energy.
(a) Gravitational
(b) Potential
(c) Electrical
(d) infinite
Ans. (d)
2. The R.D. of a metal b1ock is 2.7 x 103 kg/m3.It is immersed in water. State the situation.
(a) Sinks
(b) Floats
(c) Partially immersed
(d) No part immersed
Ans. (a)
3. The mass of an object P is double the mass of Q. If both move with the same
Velocity, then the ratio of K.E. of P to Q is
(a) 1:2
(b) 2:1
(c) 1:4
(d) 4:1
Ans. (b)
4. Pressure cannot be measured in
(a) Nm2
(b) Bar
(c) Pa
(d) kg wt
Ans. (d)
5. What is the momentum of a body of mass 100 g, having a K.E. of 20 J’?
(a) 2 kg ms-1
(b) 1/2kg ms-1
(c) 2 g cm s-1
(d) none of these
Ans. (a)
6. Pascal is the unit for
(a) Pressure
(b) Thrust
(c) Buoyant force
(d) None of these
Ans. (a)
7. 1 milibar is equal to
(a) 100 N m-2
(b) 100 N m-2
(c) 1 N m-2
(d) 1/100 N m2
Ans. (a)
8. A bird flying in the sky has
(a) K.E. only
(b) P.E. only
(c) Neither K.E. nor P.E.
(d) Both K.E. and P.E.
Ans. (d)
9. The mercury barometer was invented by
(a) Ce1sius
(b) Fahrenheit
(c) Torricelli
(d) Bernoulli
Ans. (c)
10. The atmospheric pressure at the surface of the earth is about
(a) 103 N m-2
(b) 105 N m-2
(c) 10-3 N m-2
(d) 10-5 N m-2
Ans. (b)
11. A total of 4900 joule was expended in lifting a 50 kg mass. The mass was raised
to a height of
(a) 98 m
(b) 960 m
(c) 245 m
(d) 10 m
Ans. (d)
12. The ratio of SI units to CGS units of density is
(a) 103
(c) 102
(b) 10-2
(d) 10-3
Ans. (d)
13. An object of mass 1 kg has a P.E. of 1 J relative to the ground when it is at a
Height of
(a) 0.102m
(b) 1 m
(c) 9.8m
(d) 32m
Ans. (a)
14. The density of water is
(a) 10 kg m-3
(b) 100-2 kg m-3
(c) 102 kg m-3
(d) 103 kg m-3
Ans. (d)
15. Water evaporates under atmospheric pressure. Without changing the temperature,
the same water is placed under partial vacuum. The rate of evaporation will
(a) Increase
(b) Drop to zero
(c) Decrease
(d) Remain unaffected
Ans. (a)
16. The SI unit for the coefficient of linear expansion is
(a) °C
(b) per°C
(c) cm2°C
(d) none of these
Ans. (c)

17. The SI unit for the coefficient of linear expansion is
(a) °C
(b) per°C
(c) cm2/°C
(d) none of these
Ans. (d)
18. A block of wood is floating on water at 0°C, with a certain volume V above
water level. The temperature of water is slowly raised from 0°C. How will
the volume V change with the rise of temperature?
(a) V will be unchanged
(b) V will decrease from 0°C
(c) V will decrease till 4°C and then increase
(d) V will increase till 4°C and then decrease
Ans. (d)
19. Coefficient of linear expansion always_________ with the increase in temperature.
(a) Increases
(b) Decreases
(c) Remains the same
(d) Doubles itself
Ans. (d)
20. Any solid will sink in water if its relative density is
(a) less than unity
(b) Equal to unity
(c) Greater than unity
(d) infinite
Ans. (c)
21. Choose the correct statement:
(a) α: β: γ:: 1:3:2
(b) α: β: γ:: 3:2:1
(c) α: β: γ:: 2:3:l
(d) α: β: γ:: 1:2:3
Ans. (d)
22. Any solid will not sink in water if its relative density is
(a) Less than 1
(b) Equal to 1
(c) Greater than 1
(d) infinite
Ans. (a)
23. A graph is plotted taking °C along the Y-axis and °F along the X-axis.
It is a/an
(a) parabola
(b) Straight line
(c) Ellipse
(d) Circle
Ans. (b)
24. Therm is the unit of
(a) heat
(b) temperature
(c) thermometry
(d) work
Ans. (a)
25. Absolute zero corresponds to
(a) -273 K
(b) 273°C
(c) 273°R
(d) none of these
Ans. (d)