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DSSSB TGT Workenergy — practice questions

Explore 4 free Workenergy questions in DSSSB TGT Science. 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 1–4 of 4.

A 2 kg cricket ball moving at 30 m/s has a kinetic energy of:Read the answer and worked solution →A 5 kg bag lifted to a height of 3 m above the ground (g = 10 m/s²) has gravitational POTENTIAL ENERGY of:Read the answer and worked solution →The SI unit of POWER is the:Read the answer and worked solution →The COMMERCIAL UNIT of electrical energy, used on electricity bills, is the:Read the answer and worked solution →

Worked practice questions

A 2 kg cricket ball moving at 30 m/s has a kinetic energy of:

  1. 60 J, computed as mass × velocity
  2. 30 J, half of mass × velocity
  3. 900 J, computed as ½ × 2 × 30²
  4. 1800 J, computed as mass × velocity²
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Correct answer: C. 900 J, computed as ½ × 2 × 30²

KE = ½mv² = ½ × 2 × 30² = ½ × 2 × 900 = 900 J. Doubling speed quadruples KE.

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A 5 kg bag lifted to a height of 3 m above the ground (g = 10 m/s²) has gravitational POTENTIAL ENERGY of:

  1. 150 J, computed as mgh = 5 × 10 × 3
  2. 15 J, computed as mh = 5 × 3
  3. 50 J, computed as mg = 5 × 10
  4. 30 J, computed as gh = 10 × 3
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Correct answer: A. 150 J, computed as mgh = 5 × 10 × 3

Gravitational PE = mgh = 5 × 10 × 3 = 150 J. The bag stores this energy by virtue of its raised position.

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The SI unit of POWER is the:

  1. Joule (J), equal to a newton-metre
  2. Newton (N), equal to a kg metre per second squared
  3. Watt (W), equal to one joule per second
  4. Pascal (Pa), equal to one newton per square metre
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Correct answer: C. Watt (W), equal to one joule per second

The SI unit of power is the WATT (W) = 1 joule per second. Power = Work / time. 1 horsepower = 746 W. A 100 W bulb consumes 100 J every second.

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