CBSE  /  Class 9  /  Science  /  Force and Laws of Motion

  • 1. 
    When a car at high speed makes a sharp turn, the driver in a car tends to get thrown to the side opposite to the turn. This is due to the

  • inertia of motion
  • inertia of time
  • inertia of rest
  • inertia of direction

  • 2. 
    A man is standing on a boat in still water. If he walks towards the shore, then the boat will

  • move away from the shore
  • move towards the shore
  • remain stationary
  • none of these

  • 3. 
    Which of the following is an incorrect statement?

  • Mass is measure of inertia of a body.
  • Newton’s first law of motion is the law of inertia.
  • Unbalanced force produces constant velocity.
  • Newton’s third law talks about the direction of the force.

  • 4. 
    A ball is thrown vertically upward in a train moving with uniform velocity. The ball will

  • fall behind the thrower
  • fall ahead of the thrower
  • return back to the thrower
  • fall on the left of the thrower

  • 5. 
    Which of the following is not an application of conservation of linear momentum?

  • While firing a bullet, the gun must be held tight to the shoulder
  • When a man jumps from a boat to the shore
  • A rocket explodes on midway from the ground
  • A body suspended from the hook of a spring balanced in a lift which is accelerated downward

  • 6. 
    When we stop pedalling, the bicycle begins to slow down. This is because of the

  • Frictional force acting along the direction of motion of bicycle
  • Air resistance which is in the direction of motion
  • Frictional force acting opposite to the direction of motion of bicycle by the road
  • Nature of the bicycle to stop after some time

  • 7. 
    Inertia is the property of a body by virtue of which, it cannot change by itself

  • its state of rest
  • its steady state of uniform motion
  • its direction of motion
  • all of these.

  • 8. 
    An athlete does not come to rest immediately after crossing the winning line due to the

  • inertia of motion
  • inertia of rest
  • inertia of direction
  • none of these

  • 9. 
    A bullet of mass A and velocity B is fired into a wooden block of mass C. If the bullet gets embedded in the wooden block, then the magnitude of velocity of the system just after the collision will be

  • \(\frac{A+B}{AC}\)
  • \(\frac{A+C}{B+C}\)
  • \(\frac{AC}{B+C}\)
  • \(\frac{AB}{A+C}\)

  • 10. 
    The masses of two bodies are in ratio 5 : 6 and their velocities are in ratio 1 : 2. Then their linear momentum will be in the ratio

  • 5 : 6
  • 1 : 2
  • 12 : 5
  • 5 : 12
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