Two substances A and B of equal mass m are heated at unifor…

Physics Thermometry, Thermal Expansion and Calorimetry Mix Single Correct MCQ

Published on: September 12, 2026

Two substances A and B of equal mass m are heated at uniform rate of 6 cal s –1 under similar conditions. A graph between temperature and time is shown in figure. Ratio of heat absorbed $H_{A} / H_{B}$ by them for complete fusion is

$\frac{9}{4}$

$\frac{4}{9}$

$\frac{8}{5}$

$\frac{5}{8}$

Text Solution

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The correct answer is:

From given curve,

Melting point for $A = 60^\circ C$

and melting point for $B = 20^\circ C$

Time taken by A for fusion = (6 - 2) = 4 minute

Time taken by B for fusion = (6.5 - 4) = 2.5 minute

Then $\frac{H_{A}}{H_{B}} = \frac{6 \times 4 \times 60}{6 \times 2.5 \times 60} = \frac{8}{5}$ .

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