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DSSSB TGT Workenergy — practice questions

Explore 11 free Workenergy questions in DSSSB TGT Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Workenergy questions and exercises with answers

Showing questions 1–11 of 11.

The SI unit of work is the:Read the answer and worked solution →When a goalkeeper stops a football, the force she applies on the ball does:Read the answer and worked solution →A girl applies a force of 50 N to push a box and the box moves 4 m in the direction of the force. How much work is done?Read the answer and worked solution →A man pushes a wall with a force of 200 N. The wall does not move. How much work has the man done?Read the answer and worked solution →The work-energy theorem states that the work done on an object by all forces equals:Read the answer and worked solution →Calculate the kinetic energy of a 2 kg object moving at 10 m/s.Read the answer and worked solution →A 5 kg bag is lifted slowly from the ground to a height of 2 m. Taking g = 10 m/s², the work done against gravity is:Read the answer and worked solution →If the velocity of an object doubles, its kinetic energy:Read the answer and worked solution →A child slides down a smooth slide from rest, starting at a height of 5 m. Ignoring friction and taking g = 10 m/s², the velocity at the bottom is approximately:Read the answer and worked solution →CLASS10 · Physics · Magnetic Effect — Quick True/FalseRead the answer and worked solution →True or false on magnetism (CBSE Cl 10)Read the answer and worked solution →

Worked practice questions

The SI unit of work is the:

  1. Newton (N)
  2. Pascal (Pa)
  3. Watt (W)
  4. Joule (J)
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Correct answer: D. Joule (J)

Work = Force × displacement, so its unit is N × m = joule (J). We have 1 J = 1 N × 1 m. So 1 J = 1 kg·m²·s⁻². Watt is the unit of power, newton of force, pascal of pressure.

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When a goalkeeper stops a football, the force she applies on the ball does:

  1. Positive work
  2. Infinite work
  3. Zero work
  4. Negative work
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Correct answer: D. Negative work

The force she applies on the ball is opposite to the ball's direction of motion (it's trying to stop the ball). When force and displacement are in opposite directions, the work done is negative.

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A girl applies a force of 50 N to push a box and the box moves 4 m in the direction of the force. How much work is done?

  1. 100 J
  2. 12.5 J
  3. 54 J
  4. 200 J
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Correct answer: D. 200 J

Work = Force × displacement = 50 N × 4 m = 200 J. The force and displacement are in the same direction, so the work is positive.

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