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MP Police SI Work and Energy — practice questions

Explore 6 free Work and Energy questions in MP Police SI Science. Open each question or exercise to read its content, reference answers and available explanation.

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Work and Energy questions and exercises with answers

Showing questions 1–6 of 6.

A porter lifts luggage of 20 kg from the ground onto his head, 2 m above the ground. Calculate the work done on the luggage (take g = 10 ms⁻²).Read the answer and worked solution →During the free fall of an object, which of the following forms of energy increases at any point along its path?Read the answer and worked solution →What form of energy is stored in the water held in a dam?Read the answer and worked solution →If a person moves a trolley a distance of 10 m by applying a force of 50 N, the work done is:Read the answer and worked solution →An object having the capability to do work is said to possess:Read the answer and worked solution →A force increases the speed of a 1.0 kg object from 4 m/s to 8 m/s. The work done by the force is:Read the answer and worked solution →

Worked practice questions

A porter lifts luggage of 20 kg from the ground onto his head, 2 m above the ground. Calculate the work done on the luggage (take g = 10 ms⁻²).

  1. 200 J
  2. 400 J
  3. 350 J
  4. 150 J
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Correct answer: B. 400 J

1. Work done against gravity = mgh. 2. Substitute m = 20 kg, g = 10 ms⁻², h = 2 m. 3. W = 20 × 10 × 2 = 400 J. _Source: RRB Group D CEN-02/2018 PYQ, Q.84._

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During the free fall of an object, which of the following forms of energy increases at any point along its path?

  1. Chemical energy
  2. Potential energy
  3. Mechanical energy
  4. Kinetic energy
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Correct answer: D. Kinetic energy

1. As the object falls, its height decreases so potential energy decreases. 2. Its speed increases as it falls, so kinetic energy increases. 3. Hence kinetic energy is the one that increases. _Source: RRB Group D CEN-02/2018 PYQ, Q.60._

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What form of energy is stored in the water held in a dam?

  1. Potential energy
  2. Electrical energy
  3. Kinetic energy
  4. Gravitational energy
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Correct answer: A. Potential energy

1. The stored water is at a height and is not yet moving. 2. Energy due to position/height is potential energy. 3. Hence dam water has potential energy. _Source: RRB Group D CEN-02/2018 PYQ, Q.61._

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