Physics
Isotopes of an element contain

equal number of protons and electrons
equal number of nucleons
the same number of neutrons but different number of protons
the same number of protons but different number of neutrons

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Physics
Which of the following is not a property of heavy water ?

It produces corrosion
Boiling point of heavy water is lower than that or ordinary water
Density of heavy water is higher than that of ordinary water
Freezing point of heavy water is higher than that of ordinary water

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

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