A given conductor carrying a current of 1 ampere. It produces an amount of heat equal to 2000 J. If the current through the conductor is doubled, then the amount of heat produced will be

A lady is standing in front of a plane mirror at a distance of 1 m from it. She walks 60 cm towards the mirror. The distance of her image now from herself (ignoring the thickness of the mirror) is

The brightness of a star depends on its

A glass vessel is filled with water up to the brim and a lid is fixed to it tightly. Then it is kept inside a freezer for hours. What is expected to happen?