(Set 1) Work, Power Energy

Q1. 
When the angle between the force and displacement is 90 degree, the work done is
  1. netural
  2. negetive
  3. zero (no work is done)
  4. positive

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Correct Answer : C

Q2. 
In which of the following activity activities is work side to be done?
  1. Pinki is walking on a leveled road with a book on her head
  2. Khushi 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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Correct Answer : A

Q3. 
If a plane flies a distance of 4000 m with work done of 2000 J, then the force applied is
  1. 10 N
  2. 0.2 N
  3. 5 N
  4. 50 N

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Correct Answer : C

Q4. 
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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Correct Answer : A

Q5. 
Which on of the following force non-central and non conservative
  1. Frictional force
  2. Electric force
  3. Gravitational force
  4. Mechanical force

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Correct Answer : A

Q6. 
746 W is know as
  1. 1 Pa
  2. 1 kW
  3. 1 J
  4. 1 HP

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Correct Answer : D

Q7. 
............... is the rate of doing work.
  1. Velocity
  2. Energy
  3. Power
  4. Force

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Correct Answer : C

Q8. 
Name of the physical quantity which is equal to the product of force and velocity?
  1. Energy
  2. Power
  3. Acceleration
  4. Work

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Correct Answer : B

Q9. 
Which one of the following is the value of 1 kWh of energy converted into joules?
  1. 1.8 x 10^6 J
  2. 3.6 x 10^6 J
  3. 6.0 x 10^6 J
  4. 7.2 x 10^6 J

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Correct Answer : B

Q10. 
A boy of mass 50 kg runs up a staircase of 40 steps in 10 s. If the height of each step is 15 cm, find his power.
  1. 3375 W
  2. 300 W
  3. 300 ms
  4. 300 T

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Correct Answer : B

Q11. 
Work can only be done when there is
  1. momentum
  2. energy
  3. power
  4. force

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Correct Answer : B

Q12. 
Which one of the following is not the unit of energy?
  1. J
  2. W-h
  3. N-m
  4. kg-m/s^2

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Correct Answer : D

Q13. 
A car is moving with high speed. Which energy does it possess?
  1. Frictional force
  2. Gravitational force
  3. kinetic energy
  4. potential energy

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Correct Answer : C

Q14. 
If two unequal masses possess the same kinetic energy, then the heavier mass has
  1. lower speed
  2. higher speed
  3. lesser momentum
  4. greater momentum

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Correct Answer : D

Q15. 
How is the kinetic energy of a moving object affected if the net work done on it is positive?
  1. Decreases
  2. Increases
  3. Remains constant
  4. Becomes zero

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Correct Answer : B

Q16. 
If the momentum of a body is doubled, the kinetic energy is
  1. becomes 1/4 times
  2. unchanged
  3. doubled
  4. becomes 4 times

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Correct Answer : D

Q17. 
An object of mass 15 kg is moving with a uniform velocity of 7 ms^-1. What is the kinetic energy possessed by the object?
  1. 367.5 J
  2. 17.5 J
  3. 180.5 J
  4. 367.5 ms

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Correct Answer : A

Q18. 
A wound watch spring has ............. energy.
  1. electrical
  2. kinetic
  3. potential
  4. Both kinetic and potential

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Correct Answer : C

Q19. 
A flying jet possesses .............. .
  1. potential energy
  2. kinetic energy
  3. wind energy
  4. Both kinetic energy and potential energy

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Correct Answer : D

Q20. 
A body rolling down on a hill has
  1. kinetic energy only
  2. potential energy only
  3. only friction force
  4. Both kinetic energy and potential energy

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Correct Answer : D

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