Water of mass 150g at 60\(^o\)c is added to 300g of water at 20\(^o\)c and the mixture is well stirred. Calculate the temperature of the mixture.(neglect heat losses to the surroundings)

Which of the following phenomena is the practical evidence for the existence of the continual motion of molecules.

The process by which protons are converted into helium atoms with a tremendous release of energy is called?

Which of the following is not a product of nuclear fusion?

A room is heated by means of a charcoal fire, an occupants of the room standing away from the fire is warmed mainly by