Practice test

Work, energy and power - Test Set 2

Review 20 exam-focused questions with detailed explanations, then start the interactive test when you are ready.

20 questions

Questions and explanations

  1. Question 1

    When a freely falling object eventually stops on reaching the ground ………
    1. Its potential energy decreases
    2. Its kinetic energy increases
    3. Its potential energy decreases and its kinetic energy increases
    4. None of the option is correct
    View explanation

    Sign In to See Explanations. Sign Up Here

  2. Question 2

    During the free fall of an object, which of the following energies increases at any point in its path?
    1. Chemical energy
    2. Mechanical energy
    3. Kinetic energy
    4. Potential energy
    View explanation

    Sign In to See Explanations. Sign Up Here

  3. Question 3

    When a ball bounces off the ground, which of the following changes suddenly?
    1. Its speed
    2. Its momentum
    3. Its kinetic energy
    4. Its potential energy
    View explanation

    Sign In to See Explanations. Sign Up Here

  4. Question 4

    When a ball is thrown upwards, then at what position its potential energy will be maximum?
    1. At time of throwing
    2. At the ground
    3. Just before striking ground
    4. At top most position
    View explanation

    Sign In to See Explanations. Sign Up Here

  5. Question 5

    An object of mass 6 kg and having a potential energy of 480 J is placed at a height. Find the height of the object w.r.t. the ground.
    (Take, g = 10 m/s²)
    1. 6 m
    2. 8 m
    3. 7 m
    4. 4 m
    View explanation

    Sign In to See Explanations. Sign Up Here

  6. Question 6

    A stone is dropped from the roof of a house towards the ground. The Kinetic Energy of the stone will be maximum:
    1. Just after it is dropped
    2. When it is just on the half-way
    3. Just before it touches the ground
    4. When it touches the ground
    View explanation

    Sign In to See Explanations. Sign Up Here

  7. Question 7

    A dynamo is used to convert:
    1. Mechanical energy into Electrical energy
    2. Electrical energy into Mechanical energy
    3. Electrical energy into Magnetic energy
    4. Magnetic energy into Mechanical energy
    View explanation

    Sign In to See Explanations. Sign Up Here

  8. Question 8

    When a body falls from an aeroplane, there is an increase in its:
    1. Kinetic energy
    2. Mass
    3. Acceleration
    4. Potential energy
    View explanation

    Sign In to See Explanations. Sign Up Here

  9. Question 9

    In a water lifting electric pump, we convert:
    1. Electrical energy into Potential energy
    2. Kinetic energy into Electrical energy
    3. Kinetic energy into Potential energy
    4. Electrical energy into Kinetic energy
    View explanation

    Sign In to See Explanations. Sign Up Here

  10. Question 10

    The device used to convert solar energy into electricity is:
    1. Photovoltaic cell
    2. Daniell cell
    3. Electrochemical cell
    4. Galvanic cell
    View explanation

    Sign In to See Explanations. Sign Up Here

  11. Question 11

    A moving neutron collides with a stationary α-particle. The fraction of the kinetic energy lost by the neutron is:
    1. 1/4
    2. 1/16
    3. 9/25
    4. 16/25
    View explanation

    Sign In to See Explanations. Sign Up Here

  12. Question 12

    Which of the following have the same unit?
    1. Work and Power
    2. Torque and Moment of Inertia
    3. Work and Torque
    4. Torque and Angular momentum
    View explanation

    Sign In to See Explanations. Sign Up Here

  13. Question 13

    Which of the following is the second largest source of global energy?
    1. Fossil fuel
    2. Nuclear Energy
    3. Renewable Energy
    4. None of these
    View explanation

    Sign In to See Explanations. Sign Up Here

  14. Question 14

    The inexhaustible source of energy of stars is due to ______.
    1. Conversion of hydrogen to helium
    2. Conversion of helium to hydrogen
    3. Decay of radioactive elements
    4. Excess of oxygen
    View explanation

    Sign In to See Explanations. Sign Up Here

  15. Question 15

    Which of the following reaction is the main cause of energy radiated from Sun?
    1. Nuclear fission
    2. Nuclear fusion
    3. Chemical reaction
    4. Diffusion reaction
    View explanation

    Sign In to See Explanations. Sign Up Here

  16. Question 16

    Energy in the foods can be measured in which units?
    1. Kelvin
    2. Joule
    3. Calorie
    4. Celsius
    View explanation

    Sign In to See Explanations. Sign Up Here

  17. Question 17

    A flying jet possesses ______.
    1. Potential energy
    2. Kinetic energy
    3. Wind energy
    4. Both kinetic and potential energy
    View explanation

    Sign In to See Explanations. Sign Up Here

  18. Question 18

    When the speed of a moving object is halved, its ______.
    1. Kinetic energy becomes 1/4 of the original
    2. Kinetic energy becomes 4 times the original
    3. No change in the kinetic energy
    4. Acceleration is doubled
    View explanation

    Sign In to See Explanations. Sign Up Here

  19. Question 19

    By the use of photovoltaic cell while converting solar energy which of the following is produced?
    1. Light energy
    2. Electric energy
    3. Chemical energy
    4. Heat energy
    View explanation

    Sign In to See Explanations. Sign Up Here

  20. Question 20

    When a ball is thrown vertically upwards, which of the following quantities remains constant during its motion?
    1. Energy
    2. Displacement
    3. Velocity
    4. Acceleration
    View explanation

    Sign In to See Explanations. Sign Up Here