The total energy radiated from a black body source is collected for one minute and is used to heat a quantity of water. The temperature of water is found to increase form ${20^o}C$ to ${20.5^o}C$. If the absolute temperature of the black body is doubled and the experiment is repeated with the same quantity of water at ${20^o}C$, the temperature of water will be……. $^oC$

Water of volume $2$ litre in a container is heated with a coil of $1\,kW$ at $27\,^\circ C$. The lid of the container is open and energy dissipates at rate of $160\,J/s.$ In how much time temperature will rise from $27\,^\circ C$ to $77\,^\circ C$ [Given specific heat of water is $4.2\,kJ/kg$]

On what does the heat required to increase the temperature of substance depend ?

The thermal capacity of $100 \,g$ of aluminum (specific heat $=0.2 \,cal / g ^{\circ} C$ ) is ………… $cal / ^{\circ} C$

Two liquids $A$ and $B$ are at $32°C$ and $24°C$. When mixed in equal masses the temperature of the mixture is found to be $28°C$. Their specific heats are in the ratio of