MCQ practice · SSC Physics Board questions · Chapter 6: Effects of Heat on Matter
Which of the following does not determine the melting point?
Think it through first, then pick an option.
- a density
- b mass
- c heat
- d pressure
Answer and explanation
Correct answer: b mass
The board's printed answer. 1 g of ice and 1 kg of ice both start to melt at 0°C. The melting point is set by the kind of substance and the pressure, not by the amount.
Why the other options are wrong
- a density: Density does not set the melting point either, since it does not depend on the amount. But the board's printed answer is mass, and the question is loose in this respect.
- c heat: More heat makes melting quicker but does not move the melting point. Heat is not a determiner either, but the board's printed answer is mass.
- d pressure: Pressure does move the melting point: melting is always stated at a fixed pressure. So it is a determiner, not the answer.
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