At a power station, heat is removed from the heat exchanger by cooling water at $6.7 × 10^9\ J$ per minute. The cooling water enters at $6.0\ ^oC$ and leaves at $14.0\ ^oC$ . [Take the specific heat capacity of water $4200\ J/kg^oC$ ] Which of the following is the rate of water flow?

Water falls from height $500\,m$. The rise in temperature of water at bottom if whole of energy remains in water, will be …….. $^oC$  [sp. heat of water $4.2\,KJ/kg$ ]

Heat energy at constant rate is given to two substances $P$ and $Q$. If variation of temperature $(T)$ of substances with time $(t)$ is as shown in figure, then select the correct statement.

Two spheres made of same substance have diameters in the ratio $1 : 2.$ Their thermal capacities are in the ratio of

The temperature of Bhakhra dam water at the ground level with respect to the temperature at high level should be