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CBSE Class 9 Work and Energy — practice questions — page 3

Explore 63 free Work and Energy questions in CBSE Class 9 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 61–63 of 63.

Match each work calculation with its sign and meaning:Read the answer and worked solution →Match each power and energy commercial unit with its value:Read the answer and worked solution →Match each energy transformation with its representative apparatus:Read the answer and worked solution →

Worked practice questions

Match each work calculation with its sign and meaning:

  1. 1-A, 2-B, 3-C
  2. 1-B, 2-A, 3-C
  3. 1-C, 2-B, 3-A
  4. 1-A, 2-C, 3-B
Show answer and solution

Correct answer: A. 1-A, 2-B, 3-C

Same direction is positive work. Opposing friction is negative work. Perpendicular force does zero work.

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Match each power and energy commercial unit with its value:

  1. 1-A, 2-B, 3-C
  2. 1-B, 2-A, 3-C
  3. 1-C, 2-B, 3-A
  4. 1-A, 2-C, 3-B
Show answer and solution

Correct answer: A. 1-A, 2-B, 3-C

1 kWh = 3.6×10⁶ J. 1 hp = 746 W. 1 W = 1 J/s.

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Match each energy transformation with its representative apparatus:

  1. 1-A, 2-B, 3-C
  2. 1-B, 2-A, 3-C
  3. 1-C, 2-B, 3-A
  4. 1-A, 2-C, 3-B
Show answer and solution

Correct answer: A. 1-A, 2-B, 3-C

Thermal plants convert coal to electricity. Hydro plants convert PE of dam water. Plants convert light into chemical bonds.

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