Physics
It is easy to burst a gas-filled balloon with a needle than with a nail. It is because

Nail exerts more pressure than needle on the balloon.
Needle exerts more pressure than nail on the balloon.
Nail is more longer than needle.
Gas is reactive with the needle.

ANSWER DOWNLOAD EXAMIANS APP

Physics
A stone floor feels cold to the bare feet but a carpet on the same floor feels warm. This is because

The carpet is a better conductor of heat than the stone
The floor and carpet are at different temperatures
The human body maintains a constant temperature
The stone conveys the heat away from the feet more rapidly than the carpet

ANSWER DOWNLOAD EXAMIANS APP