Q. A solid substance is at $30℃$. To this substance heat energy is supplied at a constant rate. Then temperature versus time graph is as shown in the figure. The substance is in liquid state for the portion (of the graph)
A) $BC$
B) $CD$
C) $ED$
D) $EF$
Explanation
(b) In the given graph $CD$ represents liquid state
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.