Q. How much work is done when a force of 10 N moves an object 5 m in the direction of the force?
A.
25 J
B.
50 J
C.
75 J
D.
100 J
Show solution
Solution
Work = Force * Distance = 10 N * 5 m = 50 J.
Correct Answer:
B
— 50 J
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Q. How much work is done when a force of 15 N moves an object 3 m in the direction of the force?
A.
45 J
B.
30 J
C.
15 J
D.
60 J
Show solution
Solution
Work done = Force × Distance = 15 N × 3 m = 45 J
Correct Answer:
A
— 45 J
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Q. How much work is done when a force of 30 N moves an object 4 m in the direction of the force?
A.
120 J
B.
90 J
C.
60 J
D.
30 J
Show solution
Solution
Work = Force * Distance = 30 N * 4 m = 120 J.
Correct Answer:
A
— 120 J
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Q. If a 10 kg object is moving with a speed of 2 m/s, what is its kinetic energy?
A.
10 J
B.
20 J
C.
40 J
D.
80 J
Show solution
Solution
KE = 0.5 × m × v² = 0.5 × 10 kg × (2 m/s)² = 0.5 × 10 × 4 = 20 J.
Correct Answer:
B
— 20 J
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Q. If a 10 kg object is raised to a height of 5 m, what is the work done against gravity? (g = 9.8 m/s²)
A.
490 J
B.
980 J
C.
150 J
D.
250 J
Show solution
Solution
Work = m * g * h = 10 kg * 9.8 m/s² * 5 m = 490 J.
Correct Answer:
B
— 980 J
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Q. If a 10 N force is applied at an angle of 60 degrees to the horizontal while moving an object 3 m, what is the work done? (2020)
A.
15 J
B.
30 J
C.
25 J
D.
5 J
Show solution
Solution
Work done = Force × Distance × cos(θ) = 10 N × 3 m × cos(60°) = 10 N × 3 m × 0.5 = 15 J
Correct Answer:
A
— 15 J
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Q. If a 10 N force is applied at an angle of 60 degrees to the horizontal while moving an object 4 m, what is the work done? (2020)
A.
20 J
B.
40 J
C.
30 J
D.
50 J
Show solution
Solution
Work done = Force × Distance × cos(θ) = 10 N × 4 m × cos(60°) = 10 N × 4 m × 0.5 = 20 J
Correct Answer:
C
— 30 J
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Q. If a 1000 kg car is moving at a speed of 15 m/s, what is its kinetic energy?
A.
112,500 J
B.
225,000 J
C.
150,000 J
D.
75,000 J
Show solution
Solution
Kinetic Energy = 0.5 × mass × velocity² = 0.5 × 1000 kg × (15 m/s)² = 112,500 J
Correct Answer:
B
— 225,000 J
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Q. If a 1000 kg car is moving with a speed of 15 m/s, what is its kinetic energy?
A.
112,500 J
B.
225,000 J
C.
75,000 J
D.
150,000 J
Show solution
Solution
Kinetic Energy = 0.5 × mass × velocity² = 0.5 × 1000 kg × (15 m/s)² = 112,500 J
Correct Answer:
B
— 225,000 J
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Q. If a 1000 W motor runs for 2 hours, how much work does it do? (2000)
A.
7200 J
B.
2000 J
C.
3600000 J
D.
100000 J
Show solution
Solution
Work = Power × Time = 1000 W × (2 hours × 3600 s/hour) = 1000 W × 7200 s = 7200000 J
Correct Answer:
C
— 3600000 J
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Q. If a 1500 kg car is moving at a speed of 30 m/s, what is its kinetic energy?
A.
675,000 J
B.
450,000 J
C.
225,000 J
D.
900,000 J
Show solution
Solution
Kinetic Energy = 0.5 × mass × velocity² = 0.5 × 1500 kg × (30 m/s)² = 675,000 J
Correct Answer:
B
— 450,000 J
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Q. If a 2 kg object is lifted to a height of 10 m, what is the potential energy gained by the object? (g = 9.8 m/s²)
A.
19.6 J
B.
98 J
C.
39.2 J
D.
78.4 J
Show solution
Solution
Potential Energy (PE) = mgh = 2 kg × 9.8 m/s² × 10 m = 196 J.
Correct Answer:
B
— 98 J
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Q. If a 2 kg object is lifted to a height of 3 m, what is the potential energy gained by the object? (g = 9.8 m/s²)
A.
58.8 J
B.
19.6 J
C.
29.4 J
D.
39.2 J
Show solution
Solution
Potential Energy (PE) = mgh = 2 kg × 9.8 m/s² × 3 m = 58.8 J.
Correct Answer:
A
— 58.8 J
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Q. If a 2 kg object is moving with a velocity of 15 m/s, what is its kinetic energy?
A.
225 J
B.
150 J
C.
300 J
D.
450 J
Show solution
Solution
Kinetic Energy = 1/2 * m * v^2 = 1/2 * 2 kg * (15 m/s)^2 = 225 J.
Correct Answer:
A
— 225 J
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Q. If a 2 kg object is moving with a velocity of 3 m/s, what is its kinetic energy?
A.
9 J
B.
6 J
C.
3 J
D.
12 J
Show solution
Solution
Kinetic Energy = 0.5 * m * v² = 0.5 * 2 kg * (3 m/s)² = 9 J.
Correct Answer:
A
— 9 J
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Q. If a 3 kg object is moving with a speed of 4 m/s, what is its kinetic energy?
A.
12 J
B.
24 J
C.
36 J
D.
48 J
Show solution
Solution
KE = 0.5 × m × v² = 0.5 × 3 kg × (4 m/s)² = 0.5 × 3 × 16 = 24 J.
Correct Answer:
B
— 24 J
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Q. If a 4 kg object is lifted to a height of 2 m, what is the work done against gravity? (2021)
A.
40 J
B.
80 J
C.
20 J
D.
60 J
Show solution
Solution
Work done = mass × g × height = 4 kg × 10 m/s² × 2 m = 80 J
Correct Answer:
B
— 80 J
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Q. If a 4 kg object is moving with a speed of 5 m/s, what is its kinetic energy?
A.
50 J
B.
40 J
C.
100 J
D.
80 J
Show solution
Solution
Kinetic Energy (KE) = 0.5 × m × v² = 0.5 × 4 kg × (5 m/s)² = 0.5 × 4 × 25 = 50 J.
Correct Answer:
D
— 80 J
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Q. If a 5 kg object is dropped from a height of 10 m, what is its potential energy just before it hits the ground? (g = 9.8 m/s²)
A.
490 J
B.
980 J
C.
245 J
D.
2450 J
Show solution
Solution
Potential Energy (PE) = m × g × h = 5 kg × 9.8 m/s² × 10 m = 490 J.
Correct Answer:
B
— 980 J
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Q. If a 5 kg object is dropped from a height of 10 m, what is its potential energy just before it hits the ground? (2021)
A.
50 J
B.
100 J
C.
150 J
D.
200 J
Show solution
Solution
PE = m × g × h = 5 kg × 9.8 m/s² × 10 m = 490 J.
Correct Answer:
B
— 100 J
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Q. If a 5 kg object is moving with a speed of 10 m/s, what is its total mechanical energy assuming no potential energy?
A.
250 J
B.
500 J
C.
100 J
D.
50 J
Show solution
Solution
Total Mechanical Energy = Kinetic Energy = 0.5 * m * v² = 0.5 * 5 kg * (10 m/s)² = 250 J.
Correct Answer:
B
— 500 J
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Q. If a 5 kg object is moving with a velocity of 3 m/s, what is its kinetic energy? (2023)
A.
22.5 J
B.
30 J
C.
45 J
D.
60 J
Show solution
Solution
Kinetic Energy = 0.5 × mass × velocity² = 0.5 × 5 kg × (3 m/s)² = 22.5 J
Correct Answer:
C
— 45 J
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Q. If a car accelerates from rest to a speed of 20 m/s, and its mass is 1000 kg, what is the kinetic energy of the car at that speed? (2020)
A.
200 J
B.
1000 J
C.
2000 J
D.
4000 J
Show solution
Solution
Kinetic Energy = 0.5 × mass × velocity² = 0.5 × 1000 kg × (20 m/s)² = 200000 J = 2000 J
Correct Answer:
C
— 2000 J
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Q. If a car accelerates from rest to a speed of 20 m/s, and its mass is 1000 kg, what is the kinetic energy gained by the car? (2021)
A.
200,000 J
B.
100,000 J
C.
50,000 J
D.
400,000 J
Show solution
Solution
Kinetic Energy (KE) = 0.5 × mass (m) × velocity² (v²). KE = 0.5 × 1000 kg × (20 m/s)² = 200,000 J.
Correct Answer:
B
— 100,000 J
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Q. If a car accelerates from rest to a speed of 20 m/s, what is the kinetic energy of the car if its mass is 1000 kg?
A.
200,000 J
B.
100,000 J
C.
50,000 J
D.
400,000 J
Show solution
Solution
Kinetic Energy = 0.5 × mass × velocity² = 0.5 × 1000 kg × (20 m/s)² = 200,000 J
Correct Answer:
B
— 100,000 J
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Q. If a car with a mass of 1200 kg is moving at a speed of 15 m/s, what is its kinetic energy? (2021)
A.
13500 J
B.
9000 J
C.
18000 J
D.
27000 J
Show solution
Solution
Kinetic Energy = 0.5 × mass × velocity² = 0.5 × 1200 kg × (15 m/s)² = 13500 J
Correct Answer:
A
— 13500 J
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Q. If a force of 10 N is applied to move an object 3 m in the direction of the force, what is the work done?
A.
30 J
B.
10 J
C.
3 J
D.
0 J
Show solution
Solution
Work done = Force * Distance = 10 N * 3 m = 30 J.
Correct Answer:
A
— 30 J
Learn More →
Q. If a force of 15 N moves an object 3 m in the direction of the force, what is the work done? (2022)
A.
45 J
B.
30 J
C.
60 J
D.
15 J
Show solution
Solution
Work done = Force × Distance = 15 N × 3 m = 45 J
Correct Answer:
A
— 45 J
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Q. If a force of 20 N moves an object 5 m in the direction of the force, what is the work done?
A.
100 J
B.
50 J
C.
20 J
D.
200 J
Show solution
Solution
Work = Force * Distance = 20 N * 5 m = 100 J.
Correct Answer:
A
— 100 J
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Q. If a machine does 3000 J of work in 10 seconds, what is its power output?
A.
300 W
B.
150 W
C.
600 W
D.
1000 W
Show solution
Solution
Power (P) = Work (W) / Time (t) = 3000 J / 10 s = 300 W.
Correct Answer:
A
— 300 W
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Showing 61 to 90 of 103 (4 Pages)
Work, Energy & Power MCQ & Objective Questions
Understanding the concepts of Work, Energy, and Power is crucial for students preparing for school and competitive exams. These topics not only form the foundation of physics but also frequently appear in various examination formats. Practicing MCQs and objective questions helps students enhance their problem-solving skills and boosts their confidence, ultimately leading to better scores in exams.
What You Will Practise Here
Definition and units of Work, Energy, and Power
Work done by a constant force and variable force
Kinetic and potential energy concepts and formulas
Law of conservation of energy
Power calculations and its significance in real-life scenarios
Work-Energy theorem and its applications
Diagrams illustrating energy transformations
Exam Relevance
The topics of Work, Energy, and Power are integral to the physics syllabus across various boards, including CBSE and State Boards. In competitive exams like NEET and JEE, these concepts are often tested through numerical problems and conceptual questions. Common patterns include direct application of formulas, conceptual understanding of energy conservation, and problem-solving involving real-world scenarios. Familiarity with these areas can significantly enhance your performance in exams.
Common Mistakes Students Make
Confusing work done with energy transferred
Misapplying the work-energy theorem in different contexts
Overlooking the direction of force when calculating work
Neglecting units while solving numerical problems
Failing to differentiate between kinetic and potential energy in questions
FAQs
Question: What is the formula for calculating work done?Answer: Work done is calculated using the formula W = F × d × cos(θ), where W is work, F is the force applied, d is the distance moved, and θ is the angle between the force and the direction of motion.
Question: How is power defined in physics?Answer: Power is defined as the rate at which work is done or energy is transferred, calculated using the formula P = W/t, where P is power, W is work done, and t is the time taken.
Now is the time to strengthen your understanding of Work, Energy, and Power! Dive into our practice MCQs and test your knowledge to excel in your exams. Remember, practice makes perfect!
