Quiz  /  Uniform Circular Motion Class 9 MCQ Questions With Answers

  • 1. 
    Earth revolves around the sun, centripetal force required is provided by:

  • Frictional force
  • Gravitational force
  • Coulomb’s force
  • Magnetic force

  • 2. 
    The radius of earth in meters is:

  • 6.38×106
  • 6.38×1024
  • 6.0×106
  • 6.0×1024

  • 3. 
    The angular displacement is measured in:

  • Degrees
  • Radian
  • Both Degrees and Radians
  • None of these

  • 4. 
    If the radius of a body moving in a circle with a uniform speed is doubled, its centripetal acceleration becomes:

  • Twice
  • Three times
  • Four times
  • half

  • 5. 
    If a stone is tied to the end of a string and whirled in a circle, the tension in a string provides:

  • Centripetal force
  • Centrifugal force
  • Pressure
  • Reaction

  • 6. 
    For an object moving in a straight line with decrease in velocity, the angle between velocity and acceleration is:

  • 0o
  • 45o
  • 90o
  • 180o

  • 7. 
    For an object moving in circular path, the angle between velocity and acceleration is:

  • 0o
  • 45o
  • 90o
  • 180o

  • 8. 
    The value of “G” was determined experimentally by:

  • Newton
  • Coulomb
  • Cavendish
  • Faraday

  • 9. 
    Centripetal acceleration is due to:

  • Change in direction of velocity
  • Change in magnitude of velocity
  • Change in both magnitude and direction of velocity
  • Change in the path of velocity

  • 10. 
    The centripetal force is always directed:

  • Along the direction of motion
  • Away from center
  • Towards the center
  • In a straight line

  • 11. 
    If the uniform speed of a body moving in a circle with a uniform speed is doubled, its centripetal acceleration becomes:

  • Twice
  • Three times
  • Four times
  • half

  • 12. 
    The direction of velocity in a uniform circular motion is-

  • towards the centre
  • straight line
  • cannot be determined
  • along the tangent to the point on the circle

  • 13. 
    Velocity in uniform circular motion is

  • Constant
  • Variable
  • Sometimes variable and sometimes constant
  • Can't be determined

  • 14. 
    If mass of a body moving in a circle with a uniform speed is doubled, its centripetal force becomes:

  • Twice
  • Three times
  • Four times
  • half

  • 15. 
    1 radian =

  • 0.573o
  • 5.73o
  • 57.3o
  • 573.00

  • 16. 
    Which of the following is a tangent to the point on the circle?

  • A
  • A & B
  • A, B & D
  • C

  • 17. 
    Uniform circular motion is a uniform motion

  • True
  • False
  • Don't know

  • 18. 
    For an object moving in a straight line with increase in velocity, the angle between velocity and acceleration is:

  • 0o
  • 45o
  • 90o
  • 180o

  • 19. 
    Uniform circular motion is an accelerated motion

  • True
  • False
  • Don't Know

  • 20. 
    The mass of earth in kilograms is:

  • 6.38×106
  • 6.38×1024
  • 6.0×106
  • 6.0×1024

  • 21. 
    In a uniform circular motion

  • velocity is constant
  • acceleration is constant
  • speed is constant
  • All of the above

  • 22. 
    The value of “G” is:

  • 6.67×10 -6 Nm2/kg2
  • 6.67×10 -9 Nm2/kg2
  • 6.67×10 -10 Nm2/kg2
  • 6.67×10 -11 Nm2/kg2

  • 23. 
    The gravitational force between two bodies depends upon the product of their masses in addition to:

  • Square of the distance between them
  • Shape of bodies
  • Medium between them
  • Sum of masses

  • 24. 
    The centripetal acceleration is always directed:

  • Along the direction of motion
  • Away from center
  • Towards the center
  • In a straight line
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