Equal amounts of water are kept in a cup and in a dish. Which will evaporate faster? Why? `(AS_3)`

A metal tube & a rod of same distance same material & same outer diameter are given same amount of heat. Which will show less expansion & why ?

If a drop of water falls on a very hot iron, it takes long time to evaporate. Explain why?

If you keep lee at 0^(C) C and water at 0^(@)C in either of your hands, in which hand you will feel more chillness? Why?

If you keep ice at 0^(@)C and water at 0^(@)C in either of your hands, in which hand you will feel more chillness? Why?

Figure shows two vessels with adiabatic walls, one containing 0.1 g of helium (gamma =1.67 , M = 4 g mol^(-1)) and the other containing some amount of hydrogen (gamma = 1.4, M = 2 g mol^(-1)) . Initially , the temperatures of the two gases are equal. The gases electrically heated for some time during which equal amounts of heat are given to the gases. It is found that the temperatures rise through the same amount in the two vessels. Calculate the mass of hydrogen.

If water in one flask and castor oil in other are violently shaken and kept on a table, which will come to rest earlier

Two identical glass (mu_g=3//2) equiconvex lenses of focal length of each are kept in contact.The space between the two lenses in filled with water (mu_w=4//3) The focal length of the combination is .

Equal masses of O_(2) and H_(e) gases are supplied equal amount of heat. Which gas will undergo a greater temperature rise and why?