Potential Energy MCQs
Practice Potential Energy multiple-choice questions from Work and Energy (Class 9 Science) - tap an answer for instant feedback and a step-by-step solution. Practice the full set free on the RankByte app.
Potential EnergyQuiz - Solve & Score
Q1. A crane swings a steel girder of mass 8 kg up onto a rooftop 3 m above the yard. With g = 10 m/s^2, what potential energy is now stored in it?
- A.24 J
- B.80 J
- C.38 J
- D.240 J
Answer: D. 240 J
Gravitational PE = m*g*h = 8 * 10 * 3 = 240 J.
Q2. A warehouse hand sets a grain sack of mass 12 kg on a shelf 4 m off the floor. Using g = 10 m/s^2, what is its gain in potential energy?
- A.120 J
- B.52 J
- C.48 J
- D.480 J
Answer: D. 480 J
Gravitational PE = m*g*h = 12 * 10 * 4 = 480 J.
Q3. A librarian slides a pile of books of mass 3 kg onto a rack 5 m high. If g is taken as 10 m/s^2, how much potential energy has it acquired at the top?
- A.53 J
- B.15 J
- C.150 J
- D.30 J
Answer: C. 150 J
Gravitational PE = m*g*h = 3 * 10 * 5 = 150 J.
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