Class 11 Physics · Chapter 4 · Test 1
Work and Power
43 MCQs This test covers work done by constant and variable forces, the sign of work, the force-displacement graph and the area method with the textbook example. It also covers conservative and non-conservative forces, power and its units, and the kilowatt-hour with related numerical applications.
43 questions · 35 min · 43 marks
Want to try first? Take the free Physics test: Physical Quantities and Uncertainty
Sample questions
The first 5 of 43. Try each one, then tap to see the answer.
Question 1
The work done by a constant force F that displaces an object a distance d along the direction of the force is:
- AW = F/d
- BW = Fd
- CW = d/F
- DW = F + d
Show answerHide answer
Answer: B
Work is the product of the magnitude of the force and the magnitude of the displacement.
Question 2
The SI unit of work is the:
- Anewton
- Bwatt
- Cjoule
- Dpascal
Show answerHide answer
Answer: C
Work is measured in joules.
Question 3
One joule is equal to:
- A1 N s
- B1 N m
- C1 N/m
- D1 kg m/s
Show answerHide answer
Answer: B
From W = Fd we have 1 J = 1 N × 1 m.
Question 4
Pushing hard on a rigid wall does no work because the:
- Adisplacement is zero
- Bforce is zero
- Cwall is heavy
- Dforce acts upward
Show answerHide answer
Answer: A
Work needs a displacement of the point of application so zero displacement means zero work.
Question 5
When a force F makes an angle θ with the displacement d the work done is:
- AFd sinθ
- BFd/cosθ
- CFd cosθ
- DFd tanθ
Show answerHide answer
Answer: C
Work equals the component of force along the displacement times the displacement: W = Fd cosθ.
More tests in Work, Energy and Power
Practise with a free account
Save your scores, see which chapters need work, and keep a notebook of every question you got wrong.