MCQ practice · SSC Physics Board questions · Chapter 4: Work, Power and Energy
What will be the available useful energy?
Think it through first, then pick an option.
- a 250 J
- b 400 J
- c 500 J
- d 800 J
Answer and explanation
Correct answer: a 250 J
The useful energy is the actual work: weight × height = 50 × 5 = 250 J. The 400 J is the energy supplied (total), and 150 J is wasted.
Why the other options are wrong
- b 400 J: This is not the answer: The useful energy is the actual work: weight × height = 50 × 5 = 250 J. The 400 J is the energy supplied (total), and 150 J is wasted.
- c 500 J: This is not the answer: The useful energy is the actual work: weight × height = 50 × 5 = 250 J. The 400 J is the energy supplied (total), and 150 J is wasted.
- d 800 J: This is not the answer: The useful energy is the actual work: weight × height = 50 × 5 = 250 J. The 400 J is the energy supplied (total), and 150 J is wasted.
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