Practice test

Work, energy and power - Test Set 4

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

    Which of the following is false with reference to a photovoltaic cell?
    1. It is another name as solar cell
    2. It can be used as infra-red detectors
    3. It can store light energy in the form of electrical energy
    4. It converts electric energy into light energy
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  2. Question 2

    One Kilowatt hour is equal to—
    1. 3.6 Mega Joule
    2. 3.8 Mega Joule
    3. 3.2 Mega Joule
    4. 4.0 Mega Joule
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  3. Question 3

    In which of the following cases, Kinetic energy is being used in performing work?
    1. Paddling the bicycle to cover a distance
    2. Driving a car to cover a distance
    3. Wind mill grinding wheat grain
    4. Rowing a boat in the lake
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  4. Question 4

    Which of the following pairs of physical quantities have the same dimensions?
    1. Force and Power
    2. Work and Power
    3. Work and Energy
    4. Momentum and Power
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  5. Question 5

    The energy stored in a watch spring is:
    1. Kinetic energy
    2. Potential energy
    3. Heat energy
    4. Chemical energy
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  6. Question 6

    Energy that is produced commercially from coal is called:
    1. Light energy
    2. Kinetic energy
    3. Thermal energy
    4. Potential energy
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  7. Question 7

    In a photocell light energy is converted into:
    1. Potential energy
    2. Chemical energy
    3. Heat energy
    4. Electrical energy
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  8. Question 8

    A kilowatt-hour is unit of:
    1. Energy
    2. Power
    3. Electric charge
    4. Electric current
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  9. Question 9

    Solar energy is converted into chemical energy during:
    1. Transpiration
    2. Photosynthesis
    3. Diffusion
    4. Osmosis
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  10. Question 10

    In a rechargeable cell what kind of energy is stored within the cell?
    1. Electrical energy
    2. Potential energy
    3. Chemical energy
    4. Kinetic energy
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  11. Question 11

    The energy emitted by the Sun is due to:
    1. Chemical reaction
    2. Nuclear fission
    3. Nuclear fusion
    4. All of the above
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  12. Question 12

    How much mechanical work must be done to completely melt 1 gram of ice at 0°C?
    1. 4.2 J
    2. 80 J
    3. 336 J
    4. 2268 J
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  13. Question 13

    A bullet is fired from a rifle which recoils after firing. The ratio of kinetic energy of the rifle to that of the bullet is:
    1. Zero
    2. One
    3. Less than one
    4. More than one
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  14. Question 14

    Direct conversion of solar energy with the use of a photovoltaic cell results in the production of:
    1. Optical energy
    2. Electrical energy
    3. Thermal energy
    4. Mechanical energy
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  15. Question 15

    A photo-electric cell converts:
    1. Mechanical energy to Electric energy
    2. Heat energy to Mechanical energy
    3. Light energy to Chemical energy
    4. Light energy to Electrical energy
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  16. Question 16

    Find the energy possessed by an object of mass 13 kg when it is at a height of 5 m above the ground:
    (Take, g = 9.8 m/s²)
    1. 528 J
    2. 539 J
    3. 637 J
    4. 588 J
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  17. Question 17

    In which case does the potential energy decrease?
    I. On compressing a spring.
    II. On stretching a spring.
    III. On moving a body against gravitational force.
    IV. On the rising of an air bubble in water.
    Select the correct answer.
    1. I and II
    2. Only IV
    3. III and IV
    4. All of these
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  18. Question 18

    Which one of the following statements about energy is correct?
    1. Energy can be created as well as destroyed.
    2. Energy can be created but not destroyed.
    3. Energy can neither be created nor destroyed.
    4. Energy cannot be created but can be destroyed.
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  19. Question 19

    A body is falling freely under the action of gravity alone in vacuum. Which one of the following remains constant during the fall?
    1. Potential energy
    2. Kinetic energy
    3. Total linear momentum
    4. Total mechanical energy
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  20. Question 20

    Which one among the following happens when a swing rises to a certain height from its rest position?
    1. Its potential energy decreases while kinetic energy increases.
    2. Its kinetic energy decreases while potential energy increases.
    3. Both potential and kinetic energy decreases.
    4. Both potential and kinetic energy increases.
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