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Work, Energy and Power Physics - Work, Energy and Power

ICSE - STD 10 - Physics (ICSE - English Medium). 246 questions in this chapter.

Question types

Work, Energy and Power question types

246 questions across 6 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.

246
Questions
6
Question groups
5
Question types
Sample Questions

Work, Energy and Power questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1[1 Mark Question Answer]1 Mark
A metal ball of mass 2kg is allowed to fall freely from rest from a height of 5m above the ground.
What happens to the mechanical energy after the ball hits the ground and comes to rest ?
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Q 6[2 Mark Question Answer]2 Marks
 The bob of a simple pendulum is imparted a velocity $5 m s ^{-1}$ when it is at its mean position. To what maximum vertical height will it rise on reaching to its extreme position if $60 \%$ of its energy is lost in overcome friction of air?
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Q 7[2 Mark Question Answer]2 Marks
A metal ball of mass $2\ kg$ is allowed to fall freely from rest from a height of $5\ m$ above the ground.
(Take $g = 10 m s^{-2}$​​​​​​​)
Calculate the potential energy possessed by the ball when initially at rest.
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Q 11[3 Mark Question Answer]3 Marks
A hydroelectric power station takes its water from a lake whose water level if 50 m above the turbine. Assuming an overall efficiency of 40%, calculate the mass of water which must flow through the turbine each second to produce power output of 1 MV.
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Q 12[3 Mark Question Answer]3 Marks
The diagram given below shows a ski jump. A skier weighing $60 kg$ stands at A at the top of ski jump. He moves from A to B and takes off for his jump at $B$.



(a) Calculate the change in the gravitational potential energy of the skier between $A$ and $B$.
(b) If $75 \%$ of the energy in part (a) becomes kinetic energy at B. Calculate the speed at which the skier arrives at B.
(Take $g =10 m s ^{-2}$ )
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Q 13[3 Mark Question Answer]3 Marks
A stone of mass 500g is thrown vertically upwards with a velocity of $15 m s^{-1}. $Calculate: (a) the potential energy at the greatest height, (b) the kinetic energy on reaching the ground, (c) the total energy at its half-way point.
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Q 14[3 Mark Question Answer]3 Marks
A pendulum with bob of mass m is oscillating on either side from its resting position A between the extremes B and C at a vertical height h and A. what is the kinetic energy K and potential energy U when the pendulum is at position (i) A, (ii) B and (iii) C?
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Q 16[5 Mark Question Answer]5 Marks
A pendulum is oscillating on either side of its rest position. Explain the energy changes that takes place in the oscillating pendulum. How does the mechanical energy remains constant in it? Draw the necessary diagram.
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Q 17[5 Mark Question Answer]5 Marks
Show that the sum of kinetic energy and potential energy (i.e., total mechanical energy) is always conserves in the case of a freely falling body under gravity (with air resistance neglected) from a height h by finding it when (i) the body is at the top, (ii) the body has fallen a distance x, (iii) the body has reached the ground.
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Q 19[5 Mark Question Answer]5 Marks
 A boy of weight $40$ kgf climbs up the $15$ steps , each $15 \ cm$ high in $10 s$ and a girl of weight $20$ kgf does the same in $5 s .$
Compare:
i. the work done, and
ii. the power developed by them. Take $g =10 N kg ^{-1}$.
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Q 20MCQ1 Mark
A pendulum is oscillating on either side of its rest position. The correct statement is : ________ .
  • A
    It has only the kinetic energy at its each position.
  • B
    It has the maximum kinetic energy at its extreme position.
  • C
    It has the maximum potential energy at its mean position.
  • ✓
    The sum of its kinetic and potential energy remains constant throughout the motion.

Answer: D.

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Q 21MCQ1 Mark
A ball of mass m is thrown vertically up with an initial velocity so as to reach a height h. The correct statement is : ________ .
  • A
    Potential energy of the ball at the ground is mgh.
  • B
    Kinetic energy to the ball at the ground is zero.
  • C
    Kinetic energy of the ball at the highest point is mgh.
  • ✓
    Potential energy of the ball at the highest point is mgh

Answer: D.

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Q 22MCQ1 Mark
In an electric cell which in use, the change in energy is from : ________ .
  • A
    Electrical to mechanical
  • B
    Electrical to chemical
  • C
    Chemical to mechanical
  • ✓
    Chemical to electrical

Answer: D.

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Q 23MCQ1 Mark
A body at a height possesses : ________ .
  • A
    Kinetic energy
  • ✓
    Potential energy
  • C
    Solar energy
  • D
    Heat energy

Answer: B.

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