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Work, Power & Energy — JEE Main Physics MCQs with Solutions
Free JEE Main Physics Work, Power & Energy MCQs with step-by-step solutions. Practise online on Prepizo — no login needed.
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Sample questions with solutions
Q1 — medium · theory
A body of mass 50 kg is lifted to a height of 24-3. If a rubber ball falls from a height h and
A. Option A ✓ Correct
B. Option B
C. Option C
D. Option D
Q2 — medium · theory
Consider a force x ˆi yˆj . The work 20-3. If the potential energy between two
A. Option A ✓ Correct
B. Option B
C. Option C
D. Option D
Q3 — medium · theory
(1) 24-2. (2) ANSWER KEY 24-4. (3) 24-5. (1)
A. Option A ✓ Correct
B. Option B
C. Option C
D. Option D
Q4 — medium · numerical
Work done by gravity is independent of 24-5. KE =
A. Option A ✓ Correct
B. Option B
C. Option C
D. Option D
Q5 — medium · numerical
Average Power =
A. Option A ✓ Correct
B. Option B
C. Option C
D. Option D
Q6 — medium · theory
4 xˆi 3y2 ˆj P1 mv1
A. Option A ✓ Correct
B. Option B
C. Option C
D. Option D
Q7 — medium · theory
0 1
A. Option A ✓ Correct
B. Option B
C. Option C
D. Option D
Q8 — medium · theory
A body of mkg slides from rest along the energies and their masses are 400 g, 1.2 kg
A. Option A ✓ Correct
B. Option B
C. Option C
D. Option D
Q9 — medium · theory
If the Kinetic energy of a moving body
A. 100% (2) 200% ✓ Correct
B. 300% (4) 400%
C. W3 > W2 > W1 > W4 a particle is in one dimensional motion,
D. W3 > W2 > W4 > W1 while a conservative force F(x) acts on it.
Q10 — medium · theory
A uniformly thick wheel with moment of (4)
A. 5690 J ✓ Correct
B. 3280 J
C. 5250 J
D. 2780 J
Q11 — medium · theory
An object of mass 'm' initially at rest on a block stops at the bottom region of tube.
A. Option A ✓ Correct
B. Option B
C. Option C
D. Option D
Q12 — medium · theory
1 m v
A. Option A ✓ Correct
B. Option B
C. Option C
D. Option D
Q13 — medium · theory
In the given figure, the block of mass m is [JEE MAIN_270721_{S2}]
A. 1 mgy02 (2) 1 mgy2 (1) at x > x4, K.E. is constant throughout ✓ Correct
B. at x < x1, K.E. is smallest and the
C. mg(y – y0) (4) mgy0 particle is moving at the slowest speed.
D. at x = x2, K.E. is greatest and the
Q14 — medium · theory
A particle of mass 10 g moves in a straight of inclined plane AB along its surface with a
A. Option A ✓ Correct
B. Option B
C. Option C
D. Option D
Q15 — medium · theory
(4) 22-4. (3) 24-8. (2) 21-2. (1) 21-3. (2)
A. Option A ✓ Correct
B. Option B
C. Option C
D. Option D
Q16 — medium · numerical
Velocity just before collision = 2gh ∴ displacement is proportional to (t) /
A. Option A ✓ Correct
B. Option B
C. Option C
D. Option D
Q17 — medium · numerical
Emech. = 8J 20-3. F du = 6A 12B
A. Option A ✓ Correct
B. Option B
C. Option C
D. Option D
Q18 — medium · theory
Four particles A, B, C, D of mass
A. Option A ✓ Correct
B. Option B
C. Option C
D. Option D
Q19 — medium · theory
WORK, POWER & ENERGY
A. 36% (2) 40% ✓ Correct
B. 44% (4) 48%
C. –0.68 mgh (2) mgh
D. 1.64 mgh (4) 0.64 mgh
Q20 — medium · theory
An automobile of mass ‘m’ accelerates 1
A. Option A ✓ Correct
B. Option B
C. Option C
D. Option D
Q21 — medium · theory
velocity just sufficient to carry it to the top
A. Option A ✓ Correct
B. Option B
C. Option C
D. Option D
Q22 — medium · theory
(4) 20-1. (2) 23-1. (4) 20-3. (3) 20-4. (3)
A. Option A ✓ Correct
B. Option B
C. Option C
D. Option D
Q23 — medium · numerical
KE =
A. Option A ✓ Correct
B. Option B
C. Option C
D. Option D
Q24 — medium · numerical
(A) at x > x4, U = constant = 6J dr r7 r13
A. Option A ✓ Correct
B. Option B
C. Option C
D. Option D
Q25 — medium · theory
Two inclined planes are placed as shown in
A. Option A ✓ Correct
B. Option B
C. Option C
D. Option D
Q26 — medium · numerical
height h = 10 cm on a platform fixed at the 21-8. lowest position. The pendulum is 50 cm
A. Option A ✓ Correct
B. Option B
C. Option C
D. Option D
Q27 — medium · theory
2 23-2. 2 20-2. (2) 21-5. 1 21-6. 10
A. Option A ✓ Correct
B. Option B
C. Option C
D. Option D
Q28 — medium · theory
A stationary particle breaks into two parts
A. 19.8 m / s ✓ Correct
B. 16.7 m / s (2) 21.9 m / s (1) vB : vA (2) mB : mA
C. 10.6 m / s
D. mBvB : mAvA (4) 1: 1
Q29 — medium · theory
As shown in the figure, a particle of mass
A. Option A ✓ Correct
B. Option B
C. Option C
D. Option D
Q30 — medium · theory
A cricket ball of mass 0.15 kg is thrown 20-7. WORK, POWER & ENERGY
A. Option A ✓ Correct
B. Option B
C. Option C
D. Option D