Question

The temperature of a solid object is observed to be constant during a period. In the period
(i) heat may have been supplied to the body.
(ii) heat may have been extracted from the body.
(iii) no heat is supplied to the body.
(iv) no heat is extracted from the body.

• A. $\left(ii\right),\left(iii\right)$
• B. $\left(i\right),\left(iv\right)$
• C.
  
  $\left(i\right),\left(iii\right)$
• D. $\left(iii\right),\left(iv\right)$

Answer 1

The correct option is C


$\left(i\right),\left(iii\right)$
During phase transition, temperature of the body does not increase.
The entire heat supplied is used in changing potential energy and not kinetic energy during this period.
Both $\left(i\right)$ and $\left(iii\right)$ are possible.

FINAL ANSWER: (a)