MCQ practice · SSC Physics Board questions · Chapter 6: Effects of Heat on Matter
Of the molecules of the substance:
- i. the kinetic energy is the lowest in part CD
- ii. the potential energy is rising in part BC
- iii. in part AB the kinetic energy is proportional to the temperature
Think it through first, then pick an option.
- a i and ii
- b i and iii
- c ii and iii
- d i, ii and iii
Answer and explanation
Correct answer: c ii and iii
ii is true: BC is melting, where the heat loosens the bonds and raises the molecules' potential energy, with the kinetic energy fixed. iii is true: on AB the temperature rises and the kinetic energy rises with it. i is false.
Why the other options are wrong
- a i and ii: i is false: CD is the hottest part (up to 100°C), so the kinetic energy is the highest there. ii is true, but i spoils this option.
- b i and iii: i is false: CD has the highest temperature, so the highest kinetic energy. iii is true, but ii is also true, so this option is incomplete.
- d i, ii and iii: i is false: the kinetic energy is the highest in CD, not the lowest.
More board questions on this topic
- What does latent heat change?
- Latent heat changes which of the following of a substance?
- In the case of latent heat, which of the following is correct?
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