Statement-1: The size of a hydrogen increases as it rises in air.
Statement-2: The material of the balloon can be easily stretched.

These questions consist two statements each, printed as Assertion and reason, while answering these question you are required to choose any one of the following four responsis: (a) If both the assertion and reason are true and reason is a true explanation of the assertion. (b) If both the assertion and reason are true but the reason is not the correct explanation of assertion. (c ) If the assertion is true but reason is false. (d) If both the assertion and reason are false. Q. Assertion: The size of hydrogen bolloon increases as it rises in air. Reason: The material of the bolloon can easily stretched.

Statement-1 : Light travels faster in glass than in air. Statement-2 : Because air is rarer than glass.

Statement-1: The angle of contact of a liquid decrease with increase in temeperature Statement-2: With increase in temperature the surface tension of liquid increase.

Statement A: The melting point of water decreases with increasing pressure. Statement B : The boiling point of water rises with rising pressure.

Statement-1: Nuclei of different atom have same size Statement-2: R=R_(0)A^(1//3)

Statement-1 : Sound travels faster in moist air Statement-2 : The density of moist air is less then density of dry air.

Statement -1 : The sensitvity of a moving coil galvanometer is increased by placing a suitable magnetic material as a core inside the coil. Statement - 2: Soft iron has a high magnetic permeability and cannot be easily magnetized or demagnetized.