List of top Physics Questions on Calorimetry asked in BITSAT

During vapourisation I. change of state from liquid to vapour state occurs. II. temperature remains constant. III. both liquid and vapour states coexist in equilibrium. IV. specific heat of substance increases. Correct statements are
Two spheres of different materials, one with double the radius and one-fourth wall thickness of the other, are filled with ice. If the time taken for complete melting of ice in the larger sphere is 25 minutes and for the smaller one is 16 minutes, the ratio of thermal conductivities of the materials of larger spheres to that of smaller sphere is:
Water of volume 2 liters in a container is heated with a coil of 1 kW at 27°C. The lid is open, and energy dissipates at a rate of 160 J/s. In how much time will the temperature rise from 27°C to 77°C? (Given specific heat of water = 4.2 kJ/kgK)
During vaporisation: I. change of state from liquid to vapour state occurs. II. temperature remains constant. III. both liquid and vapour states coexist in equilibrium. IV. specific heat of substance increases. Correct statements are
Two spheres of different materials, one with double the radius and one-fourth the thickness of the other, are filled with ice. If the time taken for complete melting of the larger sphere is 25 minutes and for the smaller one is 16 minutes, the ratio of thermal conductivities of the materials of the larger sphere to that of the smaller sphere is:
A solid body of constant heat capacity 1 J/°C is being heated by keeping it in contact with reservoirs in two ways:
A copper sphere cools from 62°C to 50°C in 10 minutes and to 42°C in next 10 minutes. Calculate the temperature of surroundings.
One kilogram of ice at 0C is mixed with one kilogram of water at 80C. The final temperature of the mixture is (Take specific heat of water = 4200J kg⁻¹K⁻¹, Latent heat of ice = 336kJ kg⁻¹)
3 moles of an ideal gas at temperature 27C are mixed with 2 moles of an ideal gas at temperature 227C. Determine the equilibrium temperature of the mixture, assuming no loss of energy.