Which of the following is a correct way to represent Young's Modulus?
- (F/A)/(ΔL/L)
- (F·A)/ΔL
- F/(A·ΔL)
- (F·ΔL)/(L·A)
Show answer and explanation
Answer: A. (F/A)/(ΔL/L)
Young's modulus = longitudinal stress/longitudinal strain = (F/A)/(ΔL/L).
FSC Physics: Work and Energy, questions with answers
Practise 27 real Federal Board questions on Work and Energy from 2023 to 2026. See the answer and explanation as soon as you answer.
27real questions
6multiple choice
5exam sessions
About Work and Energy in FSC Physics
Work and Energy is one of the 14 main chapters in our Federal Board FSC Physics question bank (11th and 12th class), and about 5% of its real questions come from it. Tayyari Karo has 27 real questions on this chapter from 2023 to 2026; 6 are multiple choice and marked instantly, and the rest are short and long questions with a model answer. By difficulty: 14 easy, 13 medium.
Work through the questions below, then open the explanation for each one. Redo the ones you missed a few days later.
Try 8 real questions
These are real past-paper questions. Think of your answer first, then open the explanation.
The bodies A and B of same mass have velocities in ratio 2:1; their kinetic energies are in the ratio:
- 2:1
- 1:2
- 4:1
- 1:4
Show answer and explanation
Answer: C. 4:1
KE ∝ v² (same mass), so ratio = 2²:1² = 4:1.
If the body of mass 2 kg is raised vertically through 3 m, then work done will be:
- 58.8 J
- 50 J
- 6 J
- 50.8 J
Show answer and explanation
Answer: A. 58.8 J
W = mgh = 2 × 9.8 × 3 = 58.8 J.
Which one of the following is non-renewable source of energy?
- Coal
- Sunlight
- Wind
- Biomass
Show answer and explanation
Answer: A. Coal
Coal is a fossil fuel formed over millions of years and cannot be replenished on a human timescale, unlike sunlight, wind and biomass.
The gravity does no work, when the body moves:
- Horizontally
- At an angle of 45°
- Vertically downward
- Vertically upward
Show answer and explanation
Answer: A. Horizontally
W = Fd cosθ. Gravity acts vertically; for horizontal displacement θ=90°, so cosθ=0 and W=0.
If momentum of a body is doubled, its kinetic energy:
- Becomes half
- Remains constant
- Becomes double
- Becomes quadruple
Show answer and explanation
Answer: D. Becomes quadruple
KE = p²/2m. Doubling p makes p² four times, so KE becomes four (quadruple) times.
Distinguish between the terms elastic deformation and plastic deformation.
Show model answer
Elastic deformation is a temporary change in the shape/size of a body under an applied force; the body completely recovers its original shape once the force is removed (provided the elastic limit is not exceeded).
Plastic deformation is a permanent change in shape/size that occurs when a body is stressed beyond its elastic limit; the body does not return to its original dimensions even after the force is removed.
A ball of mass 120 g is released from a height of 30 m. If the ball encounters an air resistance of 0.3 N, find the kinetic energy of the ball just before striking the ground.
Show model answer
By the work-energy theorem, KE gained = work done by gravity − work done against air resistance:
m = 0.12 kg, h = 30 m, F_air = 0.3 N
Work by gravity = mgh = 0.12 × 9.8 × 30 = 35.28 J
Work against air resistance = F_air × d = 0.3 × 30 = 9 J
KE = 35.28 − 9 = 26.28 J
Sessions with Work and Energy questions
| Session | Questions |
|---|---|
| 2026 Annual | 5 |
| 2025 1st Annual | 5 |
| 2025 2nd Annual | 9 |
| 2024 Annual | 4 |
| 2023 Annual | 4 |
Common questions
What does the Work and Energy chapter cover on this page?
27 real Federal Board (FBISE) Physics questions on Work and Energy from 2023 to 2026, for 11th and 12th class. Each one shows the session it came from.
Are the answers official?
No. We could not find an official FBISE marking scheme for these papers, so the answers and explanations are written by Tayyari Karo for practice. Check anything important with your teacher or textbook.
Is it free?
You can start free with no signup. A small set of papers per subject is free, and Premium unlocks the full question bank.