(Set 2) Work, Power Energy

Q1. 
. When a freely falling object eventually stops on a reaching the ground ................
  1. its potential energy decreases
  2. it kinetic energy increases
  3. its potential energy decreases and its kinetic energy increases
  4. None of the option is correct

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Correct Answer : C

Q2. 
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

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Correct Answer : C

Q3. 
When a ball bounces off the ground, which of the following changes suddenly? ( Assume no loss of energy to the floor.)
  1. Its speed
  2. Its momentum
  3. Its kinetic energy
  4. Its potential energy

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Correct Answer : B

Q4. 
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

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Correct Answer : D

Q5. 
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/s^2)
  1. 6 m
  2. 8 m
  3. 7 m
  4. 4 m

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Correct Answer : B

Q6. 
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/s^2)
  1. 528 J
  2. 539 J
  3. 637 J
  4. 588 J

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Correct Answer : C

Q7. 
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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Correct Answer : C

Q8. 
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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Correct Answer : D

Q9. 
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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Correct Answer : B

Q10. 
Conversion of sound energy into electrical energy is done by
  1. solar cell
  2. gramophone
  3. microphone
  4. loudspeaker

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Correct Answer : C

Q11. 
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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Correct Answer : D

Q12. 
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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Correct Answer : A

Q13. 
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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Correct Answer : B

Q14. 
In wind power, which form of energy is converted into electrical energy?
  1. Kinetic energy
  2. Potential energy
  3. Solar energy
  4. Radianl energy

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Correct Answer : A

Q15. 
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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Correct Answer : B

Q16. 
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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Correct Answer : A

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