Physics
The increasing order of the refractive index of certain materials is (left to right) ________

Ice, Kerosene, Benzene, Rock Salt
Rock Salt, Ice, Benzene, Kerosene
Rocksalt, Benzene, Kerosene, Ice
Kerosene, Ice, Benzene, Rock Salt

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

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

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