R P Goyal and S P Tripathi Solutions for Chapter: Heat and Energy, Exercise 1: EXERCISE–6(A)

Explain the following :

(c) Fishes survive in ponds even when the atmospheric temperature is well below $0^{\circ }C$.

Explain the following :

(d) A hollow glass sphere that floats with its entire volume submerged in water at $4^{\circ }C$sinks when water is heated above $4^{\circ }C$.

Explain the following :

(e) A glass bottle completely filled with water and tightly closed at room temperature, is likely to burst when kept in the freezer of a refrigerator.

Calorie is the unit of :

$1 \mathrm{J}$ is equals to  :

The S.I Unit of temperature is :

Water is cooled from $4^{\circ }C to 0^{\circ }C$ :

Density of water is maximum at