Physics MCQs Test 5

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1. When the velocity-time graph is a straight line parallel to the time axis then__________________?

  • A. acceleration is const
  • B. acceleration is a variable
  • C. acceleration is zero
  • D. velocity is zero
See Answer
C. acceleration is zero
2. Slope of velocity time graph is_____________________?

  • A. acceleration
  • B. distance
  • C. force
  • D. momentum
See Answer
A. acceleration
3. Which law of motion is also called the law of inertia?

  • A. 1st law
  • B. 2nd law
  • C. 3rd law
  • D. all 1st, 2nd and 3rd laws
See Answer
A. 1st law
4. Newtons laws do not hold good for particles_______________?

  • A. at rest
  • B. moving slowly
  • C. move with high velocity
  • D. move with a velocity comparable to the velocity of light
See Answer
D. move with a velocity comparable to the velocity of light
5. 2nd law of motion gives the definition of________________?

  • A. force
  • B. acceleration
  • C. velocity
  • D. both force and acceleration
See Answer
B. acceleration
6. Momentum depends upon__________________?

  • A. force acts on the body
  • B. mass of the body
  • C. velocity of the body
  • D. both mass and velocity of the body
See Answer
D. Both mass and velocity of the body
7. When a body moves in a straight line then its displacement coincides with__________________?

  • A. distance
  • B. force
  • C. acceleration is zero
  • D. both A and B
See Answer
A. distance
8. Motorcycle safety helmet extends the time of collision hence decreasing the________________?

  • A. chance of collision
  • B. force acting
  • C. velocity
  • D. impulse
See Answer
D. impulse
9. During the long jump, the athlete runs before taking the jump. By doing so he__________________?

  • A. provide him with a larger inertia
  • B. decreases his inertia
  • C. decreases his momentum
  • D. increases his momentum
See Answer
D. increases his momentum
10. When a collision between the bodies in a system is inelastic then for system ____________________?

  • A. momentum changes but K.E remain conserve
  • B. K.E changes but momentum remains to conserve
  • C. both momentum and K.E changes
  • D. both momentum and K.E remain to conserve
See Answer
B. K.E changes but momentum remains conserved
11. Diffraction fringes are____________________?

  • A. equally spaced
  • B. distance between them increases
  • C. distance between them decreases
  • D. they are adjacent with no space in between
See Answer
C. distance between them decreases
12. A thing that emits its own light is___________________?

  • A. luminous
  • B. non-luminous
  • C. incandescent
  • D. bright
See Answer
A. luminous
13. Defines meter in terms of the wavelength of red cadmium light ___________________?

  • A. Newton
  • B. Einstein
  • C. Michelson
  • D. Galileo
See Answer
C. Michelson
14. Which experiment shows that the wavelength of light is smaller than that of sound___________________?

  • A. Diffraction
  • B. Polarization
  • C. Interference
  • D. Reflection
See Answer
A. Diffraction
15. When a force is parallel to the direction of motion of the body, then work done on the body is_____________________?

  • A. zero
  • B. minimum
  • C. infinity
  • D. maximum
See Answer
D. maximum
16. If a body with a mass of 2 kg is raised vertically through 2m, then the work done will be _________________?

  • A. 38.2 J
  • B. 392.1 J
  • C. 39.2 J
  • D. 3.92 J
See Answer
C. 39.2 J
17. The average power and instantaneous power become equal if work is done at __________________?

  • A. any rate
  • B. at a variable rate
  • C. at a uniform rate
  • D. at a high rate
See Answer
C. at a uniform rate
18. A proton electron neutron and a particle have the same momentum. Which of them has the highest K.E?

  • A. Proton
  • B. electron
  • C. neutron
  • D. a-particle
See Answer
B. electron
19. Work done by variable force is determined by dividing____________________?

  • A. force into small interval
  • B. displacement into small interval
  • C. both force and displacement into small intervals
  • D. force into small and displacement into large intervals
See Answer
B. displacement into small interval
20. The escape velocity of a body in the gravitational field of the earth is independent of__________________?

  • A. its mass
  • B. the angle at which it is thrown
  • C. both its mass and the angle at which it is thrown
  • D. gravitational field of the earth
See Answer
C. both its mass and the angle at which it is thrown
21. The source of geothermal energy is___________________?

  • A. decay of radioactive elements in the earth
  • B. compression of material in the earth
  • C. residual loss of the earth
  • D. all as said in A – B and C
See Answer
D. all as said in A – B and C
22. Work done by the force of friction is____________________?

  • A. always positive
  • B. always negative
  • C. positive only for the small frictional force
  • D. positive only for large frictional force
See Answer
B. always negative
23. If velocity is doubled then__________________?

  • A. momentum increases 4 times and K.E increases 2 times
  • B. momentum and K.E. remain the same
  • C. momentum increases 2 times and K.E increases constant
  • momentum increases 2 times and K.E increases 4 time
See Answer
momentum increases 2 times and K.E increases 4 times
24.  Which of the following is not a conservative force_________________?

  • A. friction
  • B. electric
  • C. gravitational
  • D. magnetic
See Answer
A. friction
25. The consumption of energy by a 60-watt bulb in 2 sec is_________________?

  • A. 120 J
  • B. 60 J
  • C. 30 J
  • D. 0.02 J
See Answer
A. 120 J
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