A warehouse robot lifts boxes onto a shelf, doing 240 J of work in 15 s. What is the power developed?

16 W. Power = Work / Time = 240 J / 15 s = 16 W.

During spring cleaning, a maid shifts furniture and performs 150 J of work over 2 s. What is the power output during this task?

75 W. Power = Work / Time = 150 J / 2 s = 75 W.

A forklift in a depot raises a pallet, expending 600 J of useful work in 5 s. At what rate is work being done?

120 W. Power = Work / Time = 600 J / 5 s = 120 W.

Class 9 · Science · Physics

Work and Energy MCQs

Take an interactive Work and Energy quiz for Class 9 Science - tap an answer for instant feedback and a step-by-step solution. These are a few sample questions; practice the full Work and Energy set free on the RankByte app.

Topics covered

Work Done by a ForceKinetic EnergyPotential EnergyLaw of Conservation of EnergyPowerCommercial Unit of Energy (kWh)Work, KE/PE, mechanical energy, power, units

Practice Work and Energy by topic

Focused MCQ quizzes for each topic.

Commercial Unit of Energy (kWh)Kinetic Energy Law of Conservation of Energy Potential Energy Power Work Done by a Force Work, KE/PE, mechanical energy, power, units

Work and EnergyQuiz - Solve & Score

A few sample questions with instant answers and solutions - the full set is in the app.

Q1. A warehouse robot lifts boxes onto a shelf, doing 240 J of work in 15 s. What is the power developed?
- A.0.0625 W
- B.3600 W
- C.16 W
- D.225 W
Answer: C. 16 W
Power = Work / Time = 240 J / 15 s = 16 W.
Q2. During spring cleaning, a maid shifts furniture and performs 150 J of work over 2 s. What is the power output during this task?
- A.300 W
- B.148 W
- C.75 W
- D.0.0133 W
Answer: C. 75 W
Power = Work / Time = 150 J / 2 s = 75 W.
Q3. A forklift in a depot raises a pallet, expending 600 J of useful work in 5 s. At what rate is work being done?
- A.595 W
- B.0.0083 W
- C.3000 W
- D.120 W
Answer: D. 120 W
Power = Work / Time = 600 J / 5 s = 120 W.