During boiling, temperature remains constant because heat is used to:
A. Break intermolecular bonds
B. Increase kinetic energy
C. Expand volume
D. Increase pressure
Answer: Option A
Solution (By JKSSB Mock Tests)
At boiling point, supplied heat (latent heat) breaks intermolecular bonds for phase change, not increasing kinetic energy (temperature). Potential energy increases while kinetic energy (temperature) stays constant. Memory aid: 'Latent heat changes state, not temperature'. Conceptual question testing phase change understanding, common in competitive exams to assess microscopic interpretation.
Explanation:
Hypermetropia (farsightedness): near point farther away, difficulty seeing close objects. Corrected with convex lens. Myopia: distant objects blurry. Presbyopia due to aging. Astigmatism due to irregular cornea.
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