Work Energy and Power Practice Questions
NEET · Physics · 1351 free MCQs with instant results and detailed explanations.
1351
Total
360
Easy
574
Medium
417
Hard
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Topics in Work Energy and Power
Work-Energy Theorem
198
Power
145
Conservation of Energy
219
Collisions
340
Potential Energy
236
Kinetic Energy
213
Sample Questions from Work Energy and Power
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
A block of mass 2 kg is pushed with a constant force of 10 N over a distance of 5 m. What is the work done on the block?
A.
50 J
B.
20 J
C.
10 J
D.
100 J
Show Answer & Explanation
Correct Answer: A
Work done is calculated by the formula W = F Ã d, where F is the force and d is the distance. Here, W = 10 N Ã 5 m = 50 J.
Q2
Easy
If a car of mass 1000 kg accelerates from rest to a speed of 20 m/s, what is the work done on the car?
A.
200,000 J
B.
400,000 J
C.
100,000 J
D.
300,000 J
Show Answer & Explanation
Correct Answer: A
The kinetic energy gained by the car is KE = 1/2 mv^2 = 1/2 à 1000 kg à (20 m/s)^2 = 200,000 J, which equals the work done.
Q3
Easy
Which of the following scenarios represents the work-energy theorem?
A.
An object moving with constant velocity
B.
A freely falling object
C.
A car accelerating on a road
D.
An object at rest
Show Answer & Explanation
Correct Answer: C
The work-energy theorem states that work done on an object is equal to the change in its kinetic energy. A car accelerating shows this principle.
Q4
Medium
A block of mass 2 kg is pushed across a surface with a constant force of 10 N. If the block moves 5 m, what is the work done on the block?
A.
50 J
B.
20 J
C.
40 J
D.
30 J
Show Answer & Explanation
Correct Answer: A
Work done is calculated as the product of force and displacement in the direction of the force. Here, Work = Force à Displacement = 10 N à 5 m = 50 J.
Q5
Medium
A car accelerates from rest to a speed of 20 m/s. If the mass of the car is 1000 kg, what is the kinetic energy gained by the car?
A.
200,000 J
B.
400,000 J
C.
100,000 J
D.
50,000 J
Show Answer & Explanation
Correct Answer: A
Kinetic energy is calculated using KE = 1/2 mv². Here, KE = 1/2 à 1000 kg à (20 m/s)² = 200,000 J.
Q6
Medium
A spring has a spring constant of 200 N/m. How much work is done in compressing the spring by 0.1 m?
A.
1 J
B.
2 J
C.
0.5 J
D.
4 J
Show Answer & Explanation
Correct Answer: A
Work done on a spring is given by W = 1/2 kx². Substituting k = 200 N/m and x = 0.1 m, we have W = 1/2 à 200 N/m à (0.1 m)² = 1 J.
Q7
Medium
If a force of 15 N acts on a 3 kg object and displaces it 4 m, what is the net work done if the object moves at a constant velocity?
A.
60 J
B.
45 J
C.
75 J
D.
0 J
Show Answer & Explanation
Correct Answer: D
When an object moves at constant velocity, the net work done is zero because the force is balanced by friction or other opposing forces. Hence, the net work done is 0 J.
Q8
Hard
A body starts from rest and accelerates uniformly to a speed of 20 m/s in 10 seconds. What is the work done on the body if its mass is 2 kg?
A.
200 J
B.
300 J
C.
400 J
D.
500 J
Show Answer & Explanation
Correct Answer: C
The work done can be calculated using the kinetic energy formula. KE = 1/2 mv². Here, v = 20 m/s and m = 2 kg. KE = 1/2 * 2 * (20)² = 400 J, which is the work done.
Q9
Hard
A particle moves along a straight line and its velocity varies according to the equation v(t) = 5t, where v is in m/s and t is in seconds. What is the work done by the particle in moving from t = 0s to t = 4s?
A.
40 J
B.
50 J
C.
60 J
D.
80 J
Show Answer & Explanation
Correct Answer: A
Work done is the integral of force over distance. Here, F = m * dv/dt = m * 5, and we need to calculate the displacement from t=0 to t=4. Integrating gives Work = 40 J.
Q10
Hard
A block slides down a frictionless incline of height 20 m. What is the speed of the block at the bottom of the incline?
A.
10 m/s
B.
14 m/s
C.
20 m/s
D.
28 m/s
Show Answer & Explanation
Correct Answer: B
Using conservation of energy, potential energy lost equals kinetic energy gained. mgh = 1/2 mv² gives v = sqrt(2gh) = sqrt(2 * 9.8 * 20) = 14 m/s.
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Work Energy and Power â NEET Physics Practice Questions Online
This page contains 1351 practice MCQs for the chapter Work Energy and Power in NEET Physics. The questions are organized by difficulty â 360 easy, 574 medium, 417 hard â so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 6 topics, giving you comprehensive coverage of the entire chapter.