Practice test

Work, energy and power - Test Set 5

Review 16 exam-focused questions with detailed explanations, then start the interactive test when you are ready.

16 questions

Questions and explanations

  1. Question 1

    Conversion of sound energy into electrical energy is done by:
    1. Solar cell
    2. Gramophone
    3. Microphone
    4. Loudspeaker
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  2. Question 2

    The conversion of mechanical energy into electrical energy does not occur in:
    1. Dams
    2. AC generator
    3. DC generator
    4. Motor
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  3. Question 3

    Which one of the following does not convert electrical energy into light energy?
    1. A candle
    2. A light emitting diode
    3. A laser
    4. A television set
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  4. Question 4

    When an incandescent electric bulb glows:
    1. The electric energy is completely converted into light
    2. The electric energy is partly converted into light energy and partly into heat energy
    3. The light energy is converted into electric energy
    4. The electric energy is converted into magnetic energy
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  5. Question 5

    The correct sequence of energy transfer that occurs when an apple falls to the ground is:
    1. Gravitational potential energy → heat energy to air → kinetic energy → heat energy to ground and apple → sound energy
    2. Gravitational potential energy → sound energy → kinetic energy → heat energy to air → heat energy to ground and apple
    3. Gravitational potential energy → kinetic energy → heat energy to air → heat energy to ground and apple → sound energy
    4. Gravitational potential energy → kinetic energy → sound energy → heat energy to air → heat energy to ground and apple
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  6. Question 6

    In wind power, which form of energy is converted into electrical energy?
    1. Kinetic energy
    2. Potential energy
    3. Solar energy
    4. Radian energy
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  7. Question 7

    Assertion (A) When two moving bodies collide, their temperature rise.
    Reason (R) The potential energy of the colliding bodies converts into heat energy.
    1. If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
    2. Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
    3. If Assertion is true but Reason is false.
    4. Both Assertion and Reason are false.
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  8. Question 8

    Creation of something from nothing is against the law of:
    1. Constant proportions
    2. Conservation of mass-energy
    3. Multiple proportions
    4. Conservation of momentum
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  9. Question 9

    Which of the following are the characteristics of an inelastic collision?
    I. Momentum is conserved.
    II. Total energy is conserved.
    III. Kinetic energy is conserved.
    IV. All the forces must be of conservative nature.
    Choose the correct answer from the codes given below.
    1. III and IV
    2. I and II
    3. I, II and IV
    4. II and IV
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  10. Question 10

    Which one of the following is not a form of stored energy?
    1. Nuclear energy
    2. Potential energy
    3. Electrical energy
    4. Kinetic energy
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  11. Question 11

    In simple harmonic motion the kinetic energy:
    1. Is never zero
    2. Becomes zero twice in every period
    3. Is zero in the mean position
    4. Is always constant
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  12. Question 12

    What is stored in a storage cell?
    1. Electric charge
    2. Electric potential
    3. Lead or some other metal
    4. Chemical energy
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  13. Question 13

    What kind of energy works when a watch spring is wound up?
    1. Kinetic energy
    2. Potential energy
    3. Electrical energy
    4. Magnetic energy
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  14. Question 14

    Two balls at the same temperature collide. What is conserved?
    1. Temperature
    2. Velocity
    3. Linear momentum
    4. Kinetic energy
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  15. Question 15

    Electrical energy is converted into mechanical energy by a:
    1. Thermostat
    2. Motor
    3. Dynamo
    4. Rectifier
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  16. Question 16

    For the same kinetic energy, the momentum shall be maximum for:
    1. Electron
    2. Proton
    3. Deuteron
    4. Alpha particle
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