Physics
A barometer is kept inside a bell jar. Air is slowly pumped out of the jar.

The mercury level does not change
The mercury level starts falling
The mercury level starts rising
The bell jar breaks up

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Physics
Isotopes of an element contain

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

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