Physics
It is easier to roll a stone up a sloping road than to lift it vertical upwards because

Work done in rolling a stone is less than in lifting it.
Work done in rolling is more than in lifting.
Work done in both is same but the rate of doing work is less in rolling.
Work done in lifting the stone is equal to rolling it.

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Physics
Isotopes of an element contain

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

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Physics
Superconductors are substances which

conduct electricity at high temperatures
offer high resistance to the flow of current
offer no resistance to the flow of electricity
conduct electricity at low temperature

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