Q. A student takes $50gm$ wax (specific heat $= 0.6\ kcal/kg℃$) 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
A) $500\ cal,\ 50℃$
B) $1000\ cal,\ 100℃$
C) $1500\ cal,\ 200℃$
D) $1000\ cal,\ 200℃$
Explanation
(c) Since specific heat $= 0.6kcal/g \times ℃ = 0.6\ cal/g \times ℃$
From graph it is clear that in a minute, the temperature is raised from $0℃$ to $50℃.$
$\Rightarrow$ Heat required for a minute $= 50 \times 0.6 \times 50 = 1500\ cal$
Also from graph, Boiling point of wax is $200℃$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.