Work Energy and Power Practice Questions
HSC/SSC (Bangladesh) · HSC Physics · 150 free MCQs with instant results and detailed explanations.
150
Total
55
Easy
68
Medium
27
Hard
Start Practicing Work Energy and Power
Take a timed quiz or customize your practice session
Sample Questions from Work Energy and Power
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
A 5 kg object is lifted 2 meters vertically. How much work is done against gravity? (Use g = 10 m/s²)
A.
100 J
B.
50 J
C.
20 J
D.
10 J
Show Answer & Explanation
Correct Answer: A
Work is calculated using the formula Work = Force × Distance. The force in this case is the weight of the object (mass × gravity), which is 5 kg × 10 m/s² = 50 N. The distance lifted is 2 m. Therefore, Work = 50 N × 2 m = 100 J.
Q2
Easy
If a car does 2000 J of work while moving a distance of 100 m, what is the average force applied by the car?
A.
20 N
B.
15 N
C.
25 N
D.
10 N
Show Answer & Explanation
Correct Answer: A
The average force can be calculated using the formula Work = Force × Distance. Rearranging gives Force = Work / Distance. Here, Force = 2000 J / 100 m = 20 N.
Q3
Easy
A ball of mass 0.5 kg is thrown upwards with an initial velocity of 20 m/s. How much kinetic energy does the ball have at its launch?
A.
100 J
B.
50 J
C.
200 J
D.
25 J
Show Answer & Explanation
Correct Answer: A
Kinetic energy (KE) is given by the formula KE = 0.5 × mass × velocity². Substituting the values: KE = 0.5 × 0.5 kg × (20 m/s)² = 0.25 × 400 = 100 J.
Q4
Medium
A box of mass 10 kg is lifted to a height of 5 meters. What is the work done against gravity? (Take g = 9.8 m/s²)
A.
490 J
B.
980 J
C.
4900 J
D.
9800 J
Show Answer & Explanation
Correct Answer: A
The work done against gravity is calculated using the formula W = mgh. Here, m = 10 kg, g = 9.8 m/s², and h = 5 m. Therefore, W = 10 * 9.8 * 5 = 490 J.
Q5
Medium
A ball is thrown vertically upward with a velocity of 25 m/s. What maximum height will it reach? (Take g = 10 m/s²)
A.
31.25 m
B.
32.5 m
C.
62.5 m
D.
125 m
Show Answer & Explanation
Correct Answer: A
The maximum height (h) can be calculated using h = v² / (2g). Substituting v = 25 m/s and g = 10 m/s² gives h = 25² / (2*10) = 31.25 m.
Q6
Medium
A box of mass 10 kg is lifted to a height of 5 meters. What is the work done against gravity? (Assume g = 9.8 m/s²)
A.
49 J
B.
98 J
C.
490 J
D.
588 J
Show Answer & Explanation
Correct Answer: C
Work done is calculated using the formula W = mgh. Here, m = 10 kg, g = 9.8 m/s², and h = 5 m. Thus, W = 10 * 9.8 * 5 = 490 J.
Q7
Medium
An object moving with a velocity of 15 m/s has a kinetic energy of 450 J. What is its mass?
A.
10 kg
B.
15 kg
C.
20 kg
D.
25 kg
Show Answer & Explanation
Correct Answer: A
Kinetic energy is given by KE = 0.5 * m * v². Rearranging gives m = 2 * KE / v². So, m = 2 * 450 / (15)² = 10 kg.
Q8
Hard
A 10 kg object is lifted vertically to a height of 5 m. Calculate the work done against gravity. (Assume g = 9.8 m/s²)
A.
490 J
B.
980 J
C.
245 J
D.
196 J
Show Answer & Explanation
Correct Answer: A
The work done against gravity is calculated using the formula W = mgh. Substituting m = 10 kg, g = 9.8 m/s², and h = 5 m gives W = 10 * 9.8 * 5 = 490 J.
Q9
Hard
A 5 kg object is lifted vertically to a height of 10 meters. Calculate the work done against gravity. (Use g = 10 m/s²)
A.
500 J
B.
100 J
C.
50 J
D.
250 J
Show Answer & Explanation
Correct Answer: A
The work done against gravity is calculated using the formula W = mgh, where m is mass, g is acceleration due to gravity, and h is height. Here, W = 5 kg * 10 m/s² * 10 m = 500 J.
Q10
Hard
A spring with a spring constant of 200 N/m is compressed by 0.1 m. How much potential energy is stored in the spring?
A.
1 J
B.
0.5 J
C.
2 J
D.
0.2 J
Show Answer & Explanation
Correct Answer: A
The potential energy stored in a compressed spring is given by the formula PE = (1/2)kx². Here, k = 200 N/m and x = 0.1 m. Thus, PE = (1/2)(200)(0.1)² = 1 J.
Showing 10 of 150 questions. Start a quiz to practice all questions with scoring and timer.
Practice All 150 Questions →Other HSC/SSC (Bangladesh) Subjects
Work Energy and Power — HSC/SSC (Bangladesh) HSC Physics Practice Questions Online
This page contains 150 practice MCQs for the chapter Work Energy and Power in HSC/SSC (Bangladesh) HSC Physics. The questions are organized by difficulty — 55 easy, 68 medium, 27 hard — 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.