Question
A student takes 50gm wax (specific heat = 0.6 kcal/kg°C) and heats it till it boils. The graph between temperature and time is as follows. Heat supplied to the wax per minute and boiling point are respectively
- 500 cal, 50°C
- 1000 cal, 100°C
- 1500 cal, 200°C
- 200°C
The correct answer is: 1500 cal, 200°C
Since specific heat = 0.6 kcal/gm ´ °C = 0.6 cal/gm ´°C
From graph it is clear that in a minute, the temperature is raised from 0°C to 50°C.
Þ Heat required for a minute = 50 ´ 0.6 ´ 50 = 1500 cal.
Also from graph, Boiling point of wax is 200°C
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