# SPSC Physics MCQs

1. The vector in space has:
a. Three components
b Two components
c. One component
d. None of these

2. The correct relation is:
a. a . b = b . a
b a . b ≠ b . a
c. a × b = b × a
d. a . b = b × a

3. N.s./m^2 is the SI unit of:
a. Surface tension
b. Viscosity
c. Force
d. Momentum
e. None of these

4. Antinodes are points where:
a. Strain is maximum
b. Frequency is maximum
c. Wave length is maximum
d. Amplitude is maximum
e. None of these

5. When the mass and speed of a body are doubled, the momentum becomes:
a. 16 times
b. 8 times
c. 4 times
d. 3 times
e. None of these

6. Efficiency of carnot engine is 100% when temperature of sink is:
a. Zero
b. Infinite
c. Equal to source
d. None of these

7. For gases obeying Boyle’s Law, if pressure is doubled, volume becomes:
a. Double
b. One half
c. Three times
d. No change

8. Distance between an antinodes and an adjacent node is:
a. λ
b. 2
c. λ/2
d. λ/4

9. Total energy of a particle performing S.H.M. is directly proportional to:
a. The amplitude
b. The square root of amplitude
c. The square of amplitude
d. The reciprocal of amplitude
e. None of these

10. Frequencies less than 20 Hz are called:
a. Supersonics
b. Ultrasonics
c. Infrasonics
d. None of these

11. Laser is an intense beam of light which is
a. Monochromatic
b. Coherent
c. Collimated
d. All of the above

12. The change in entropy ∆S of a system is given by:
a. ∆S = ∆Q/T
b. ∆S = T ∆ Q
c. ∆S = T/∆Q
d. None of these

13. The particle nature of light if evidenced from:
a. Polarisation
b. Interference
c. Diffraction
d. Photoelectric Effect
e. None of these

14. Sound waves are
a. Electromagnetic waves
b. Mechanical waves
c. Transverse waves
e. None of these

15. Kilo Watt Hour (KWh) is a unit of:
a. Electric Flux
b. Electric Field
c. Electric Energy
d. Electric Potential
e. None of these

16. All motions are:
a. Absolute
b. Uniform
c. Relative
d. None of these

17. The normal human body temperature on Fahrenheit scale is:
a. 96°F
b. 98.6°F
c. 99°F
d. 100°F

18. We get light inside a room in daytime due to:
a. Diffraction
b. Interference
c. Polarisation
d. Refraction
e. None of these

19. The radiation which gives sense of heat is called:
a. Visible light
b. Invisible light