- Amal Augustine
- December 19, 2025
Energy Conversion and Power MCQs: Ultimate & Smart High-Score Practice for NEET,JEE &CUET
Energy Conversion and Power MCQs are designed to test how effectively students understand the relationship between force, displacement, energy transformation, and rate of work done. These energy conversion and power mcqs questions go beyond direct formula application and require conceptual clarity in areas such as the work–energy theorem, conservative and non-conservative forces, efficiency of machines, and instantaneous power.
Energy conversion and power MCQs test how efficiently energy changes form while considering the rate at which work is done. In energy conversion and power mcqs many numerical problems, mechanical energy converts into kinetic, potential, thermal, or electrical energy, and power quantifies how fast this conversion occurs.Energy conversion and power mcqs questions uch as work–energy theorem, efficiency, and instantaneous power to evaluate real systems like engines, lifts, pumps, and motors.
In competitive exams and board-level assessments, energy conversion and energy conversion and power MCQs often combine vector mechanics, motion analysis, and real-life systems like engines, lifts, pumps, and rotating bodies. Practicing such energy conversion and power mcqs like numericals helps aspirants build accuracy, speed, and confidence in solving physics problems under exam conditions.
Energy Conversion and Power MCQs
1.
An engineer claims to have made an engine delivering 10 kW power with fuel consumption of 1 g/s. The calorific value of fuel is 2 kcal/g. This claim is:
A. Valid
B. Invalid
C. Depends on engine design
D. Dependent on load
Answer: B
2.
If the unit of force and length are each increased by four times, then the unit of energy is increased by:
A. 16 times
B. 8 times
C. 4 times
D. 2 times
Answer: A
3.
Which of the following must be known in order to determine the power output of an automobile?
A. Final velocity and weight
B. Mass and amount of work performed
C. Force exerted and distance of motion
D. Work performed and elapsed time of work
Answer: D
4.
A particle of mass m is tied to one end of a string of length l and rotated in a horizontal circle with speed v. The work done in half rotation is:
A. Zero
B. 2lmv²
C. 2mv²l
D. lmv²
Answer: A
5.
With what minimum acceleration can a fireman slide down a rope while the breaking strength of the rope is 32\frac{3}{2} of the weight?
A. 2/3 g
B. g
C. 1/3 g
D. Zero
Answer: C
6.
Three concurrent coplanar forces 1 N, 2 N, and 3 N can keep a body in equilibrium if 2 N and 3 N act at an:
A. Acute angle
B. Right angle
C. Obtuse angle
D. Same angle
Answer: C
7.
A ball falls from 20 m height and rebounds to 5 m. Time of impact is 0.02 s. The acceleration during impact is:
A. 1200 m/s²
B. 1000 m/s²
C. 2000 m/s²
D. 1500 m/s²
Answer: A
8.
A force 7i^+6j^7\hat{i}+6\hat{j} moves a body with velocity 3j^+4k^3\hat{j}+4\hat{k}. The power developed is:
A. √45
B. 45 W
C. 24 W
D. √24
Answer: C
9.
If 120 J of work is done in 2 minutes by a pump, its power is:
A. 1 W
B. 14.4 kW
C. 60 W
D. 240 W
Answer: D
10.
A 2 kg mass is displaced horizontally by 50 cm. The work done by normal reaction is:
A. 10 J
B. 0
C. 100 erg
D. 100 J
Answer: B
11.
A force 3i^+4j^3\hat{i}+4\hat{j} N displaces a body by 3i^+4j^3\hat{i}+4\hat{j} m. Work done is:
A. 5 J
B. 25 J
C. 30 J
D. 45 J
Answer: B
12.
A force of 5 N moves a body 10 m with work done 25 J. The angle between force and displacement is:
A. 75°
B. 60°
C. 45°
D. 30°
Answer: B
13.
A wire is stretched by 1 mm using 1 kN force. Work done is:
A. 5 erg
B. 5 J
C. 0.5 erg
D. 0.5 J
Answer: D
14.
If force ∝ x², then work done ∝:
A. x
B. x²
C. x³
D. x⁻²
Answer: C
15.
If force ∝ 1/x, then work done ∝:
A. x²
B. t
C. x
D. log x
Answer: D
16.
SI unit of power is:
A. Joule
B. Erg
C. Newton
D. Watt
Answer: D
17.
One man does work in 10 s, another in 20 s. Ratio of powers is:
A. 1
B. 1/2
C. 2 : 1
D. None
Answer: C
18.
Heart pushes 1 cc blood per second at pressure 20000 N/m². Power is:
A. 0.02 W
B. 400 W
C. 5×10⁻¹⁰ W
D. 0.2 W
Answer: A
19.
If force F = 2x, work done from x₁ to x₂ is:
A. x₂² − x₁²
B. Zero
C. 2x²(x₂ − x₁)
D. 2x₁(x₁ − x₂)
Answer: A
20.
Power of an engine lifting 100 kg through 10 m in 1 min is:
A. 163.3 W
B. 980 W
C. 10000 W
D. 5000 W
Answer: A
21.
A 3 kg block slides down a quarter circle of radius 2 m and reaches 4 m/s. Work done against friction is:
A. 60 J
B. 36 J
C. 24 J
D. 12 J
Answer: B
22.
Identify the false statement:
A. Work-energy theorem follows from Newton’s laws
B. It holds in inertial frames
C. Work done by friction over closed path is zero
D. Friction has no potential energy
Answer: C
23.
A motor applies constant force. Power varies with time as:
A. Graph a
B. Graph b
C. Graph c
D. Graph d
Answer: D
24.
Work done in the first meter from a force–distance graph is:
A. 5 J
B. 10 J
C. 15 J
D. 2.5 J
Answer: D
25.
A force 5i^+3j^5\hat{i}+3\hat{j} displaces a body by 2i^−j^2\hat{i}-\hat{j}. Work done is:
A. Zero
B. 12 J
C. 7 J
D. 13 J
Answer: C
26.
Which relation is correct?
A. Joule = Coulomb × Volt
B. Joule = Volt × Ampere
C. Joule = Coulomb / Volt
D. Volt = Joule × Coulomb
Answer: A
27.
Work done by gravity when a 100 g particle rises at 5 m/s is:
A. -0.5 J
B. -1.25 J
C. 1.25 J
D. 0.5 J
Answer: B
28.
Work done from x = 0 to 6 m using force–distance graph is:
A. 4.5 J
B. 13.5 J
C. 9.0 J
D. 18.0 J
Answer: B
29.
Work done by force 2i^−j^−k^2\hat{i}-\hat{j}-\hat{k} moving object from origin to (3,2,-5) is:
A. 100
B. 25
C. 50
D. 10
Answer: B
30.
If work function increases (W₂ > W₁), the photocurrent changes as:
A. I₁ = I₂
B. I₁ > I₂
C. I₂ > I₁
D. I₂ = I₁ / 2
Answer: A
Conclusion
Mastering energy conversion and power MCQs enables aspirants to clearly visualize how energy flows through physical systems and how forces influence motion over time. These energy conversion and power mcqs of numericals reinforce the idea that energy is not lost but transformed, whether in mechanical motion, frictional losses, or machine efficiency.
By regularly practicing work, energy conversion and power mcqs questions, learners develop a strong foundation in mechanics that directly supports advanced topics in physics. A solid grasp of these concepts not only improves exam performance but also enhances real-world understanding of how engines, machines, and natural systems operate efficiently.
Energy conversion and power MCQs emphasize conservation laws, losses due to friction, and practical efficiency, while power MCQs focus on time dependence and output performance. Together i.e., energy conversion and power mcqs, these problems strengthen understanding of how physical systems transform energy and deliver useful work within given time constraints, making them essential for mastering real-world physics applications and competitive exam problem-solving.
Amal Augustine is the founder of ExQuizMe, a dynamic learning and quiz platform built to make education engaging, competitive, and fun. A passionate learner and an academic achiever, Amal completed his schooling at Government HSS Manjapra, graduating with 92.5% in Computer Science. He later earned his degree from St. Stephen’s College, University of Delhi, one of India’s most prestigious arts and science institutions.
Currently, Amal is pursuing his Master’s degree at National Sun Yat-sen University, Taiwan, where he continues to deepen his interest in research and technology. Throughout his school and college years, he won 50+ national-level interschool and collegiate quiz competitions, was
Beyond academics, Amal Augustine is an avid reader of science journals, a dedicated research student, and a technology enthusiast who loves programming and exploring the world of Computer Science. Through ExQuizMe, he aims to make learning accessible, enjoyable, and empowering for students across the globe.