MCQ practice · SSC Physics Board questions · Chapter 4: Work, Power and Energy
"Heat is produced when hands are rubbed together." What kind of energy transformation is this?
Think it through first, then pick an option.
- a chemical energy to heat energy
- b electrical energy to heat energy
- c heat energy to mechanical energy
- d mechanical energy to heat energy
Answer and explanation
Correct answer: d mechanical energy to heat energy
Rubbing is mechanical energy and friction turns it into heat: mechanical energy to heat energy. No electricity or new chemical energy is involved.
Why the other options are wrong
- a chemical energy to heat energy: This is not the answer: Rubbing is mechanical energy and friction turns it into heat: mechanical energy to heat energy. No electricity or new chemical energy is involved.
- b electrical energy to heat energy: This is not the answer: Rubbing is mechanical energy and friction turns it into heat: mechanical energy to heat energy. No electricity or new chemical energy is involved.
- c heat energy to mechanical energy: This is not the answer: Rubbing is mechanical energy and friction turns it into heat: mechanical energy to heat energy. No electricity or new chemical energy is involved.
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