Work Done by a Force MCQs
Practice Work Done by a Force multiple-choice questions from Work, Energy, and Simple Machines (Class 9 Science) - tap an answer for instant feedback and a step-by-step solution. Practice the full set free on the RankByte app.
Work Done by a ForceQuiz - Solve & Score
Q1. The SI unit of work is the:
- A.joule
- B.newton
- C.watt
- D.pascal
Answer: A. joule
The idea this question leans on: Work is measured in joules. That fits the listed correct option directly - Correct. Quickly on the wrong ones: option B) 'newton' is wrong because Unit of force; option C) 'watt' fails since Unit of power. Hence the answer is A) joule.
Q2. The SI unit of work is the joule, which equals:
- A.1 newton-metre (N m)
- B.1 newton per metre
- C.1 kilogram-metre
- D.1 watt-second squared
Answer: A. 1 newton-metre (N m)
Q3. Pushing hard against a rigid wall that does not move involves work (in physics) equal to:
- A.zero
- B.a very large value
- C.the force applied
- D.the time you pushed
Answer: A. zero
Going back to the NCERT chapter, The work-energy theorem gives W = F * s * cos(theta) for a constant force; when the force and displacement align, W = F * s => substituting the data yields the quoted result; hence the answer is zero. That fits the listed correct option directly - Correct. Quickly on the wrong ones: option B) 'a very large value' is wrong because No displacement means zero work, however hard you push; option C) 'the force applied' misses the point - Force alone is not work without displacement. Hence the answer is A) zero.
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