Physics
Isotopes of an element contain

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

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Physics
Water pipes in hilly areas often burst on a cold frosty night, because

The material of which pipes are made contracts due to cold and so breaks
None of these
Frost makes the pipes rusty, so they break
Water in the pipes freezes and on freezing water expands, so pipes break

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Physics
Acceleration is

Directly proportional to mass
Directly proportional to force
Inversely proportional to force
Inversely proportional to mass

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