Practice test

Work, energy and power - Test Set 3

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

    What is the SI unit of heat energy?
    1. Joule
    2. Newton
    3. Calorie
    4. Kelvin
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  2. Question 2

    What is the unit of calorific value?
    1. kN/kg
    2. kJ/kg
    3. kW/sec
    4. kCal/sec
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  3. Question 3

    When the angle between the force and displacement is 90°, the work done is:
    1. neutral
    2. negative
    3. zero (no work is done)
    4. positive
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  4. Question 4

    In which of the following activities is work said to be done?
    1. Pinki is walking on a leveled road with a book on her head
    2. Klushi is pushing a wall of a house but fails to do so
    3. Shruti is sitting on a chair
    4. Harsh is reading a book
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  5. Question 5

    If a plane flies a distance of 4000 m with work done of 20000 J, then the force applied is:
    1. 10 N
    2. 0.2 N
    3. 5 N
    4. 50 N
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  6. Question 6

    The work done by an object is 56 J and the force exerted on it is 7N, find the displacement.
    1. 8 m
    2. 80 m
    3. 80 m/s
    4. 80 m/s
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  7. Question 7

    Work done on an object depends on:
    A. displacement
    B. angle between force and displacement
    C. force applied
    D. mass of the object
    Which of these points are correct?
    1. A, B and D
    2. A, B and C
    3. A, C and D
    4. B, C and D
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  8. Question 8

    Consider the following statements.
    I. When a coole carrying a load on his head moves on a horizontal platform, the work done by the coole against gravity is zero.
    II. When a satellite revolves in a circular orbit around the earth, the work done by the gravitational force on the satellite is zero.
    III. When a body falls freely under gravity, the work done by gravity is negative.
    IV. Work is a scalar quantity.
    Which of the statement(s) given above is/are correct?
    1. I and II
    2. II and III
    3. Only IV
    4. I, II and IV
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  9. Question 9

    Which one of the following force is non-central and non-conservative?
    1. Frictional force
    2. Electric force
    3. Gravitational force
    4. Mechanical force
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  10. Question 10

    746 W is known as
    1. 1 Pa
    2. 1 kW
    3. 1 J
    4. 1 HP
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  11. Question 11

    Which of the following pair of physical quantity has same dimensions?
    1. Work and Energy
    2. Force and Power
    3. Work and Power
    4. Power and Motion
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  12. Question 12

    Energy stored in a spring in watch—
    1. Kinetic Energy
    2. Potential Energy
    3. Heat Energy
    4. Chemical Energy
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  13. Question 13

    A stone is dropped from the roof of a house towards the ground. When will the K.E. of the stone be maximum?
    1. Just after it drops
    2. Just before reaching the ground
    3. Just after touching the ground
    4. After covering the half distance
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  14. Question 14

    Which of the following is the cleanest source of energy?
    1. Bio-fuel
    2. Fossil fuel
    3. Nuclear power
    4. Wind energy
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  15. Question 15

    Which one of the following is not a non-conventional source of energy?
    1. Solar Energy
    2. Natural Gas
    3. Wind Energy
    4. Tidal Power
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  16. Question 16

    Kinetic energy depends on:
    1. The velocity or speed of the moving body
    2. The mass of the moving body
    3. The pressure of the moving body
    4. Both mass and velocity of the moving body
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  17. Question 17

    Which of the following sources has the largest share in power generation in India?
    1. Atomic power
    2. Thermal power
    3. Hydro power
    4. Wind power
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  18. Question 18

    Which of the following is not a vector quantity?
    1. Work
    2. Force
    3. Displacement
    4. Velocity
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  19. Question 19

    ______ is the mechanical transfer of energy to a system or from a system by an external force on it.
    1. Work
    2. Power
    3. Intensity
    4. Force
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  20. Question 20

    Rate of work done is by:
    1. Power
    2. Work
    3. Intensity
    4. Force
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