CBSE  /  Class 9  /  Science  /  Work and Energy

  • 1. 
    When a body falls freely towards the earth, then its total energy

  • increases
  • decreases
  • remains constant
  • first increases and then decreases

  • 2. 
    A car is accelerated on a levelled road and attains a velocity 4 times of its initial velocity. In this process the potential energy of the car

  • does not change
  • becomes twice to that of initial
  • becomes 4 times that of initial
  • becomes 16 times that of initial

  • 3. 
    In case of negative work the angle between the force and displacement is (NCERT Exemplar)

  • 0°
  • 45°
  • 90°
  • 180°

  • 4. 
    An iron sphere of mass 10 kg has the same diameter as an aluminium sphere of mass is 3. 5 kg. Both spheres are dropped simultaneously from a tower. When they are lo m above the ground, they have the same.

  • acceleration
  • momenta
  • potential energy
  • kinetic energy

  • 5. 
    A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a levelled road. The work done against the gravitational force will be (g = 10 ms²)

  • 6 × 10³ J
  • 6 J
  • 0. 6 J
  • zero

  • 6. 
    Which one of the following is not the unit of energy?

  • joule
  • newton metre
  • kilowatt
  • kilowatt hour

  • 7. 
    The work done on an object does not depend upon the

  • displacement
  • force applied
  • angle between force and displacement
  • initial velocity of the object

  • 8. 
    Water stored in a dam possesses

  • no energy
  • electrical energy
  • kinetic energy
  • potential energy

  • 9. 
    A body is falling from a height h. After it has fallen a height \(\frac{h}{2}\), it will possess

  • only potential energy
  • only kinetic energy
  • half potential and half kinetic energy
  • more kinetic and less potential energy

  • 10. 
    The number of joules contained in 1 kWh is

  • 36 × 10J
  • 3. 6 × 10J
  • 36 × 10J
  • 3. 7 × 10J
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