Physics
Which of the following was the first theory of superconductivity?

Resonating valence bond theory
Quantum field theory
London theory
Ginzburg Landau theory

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Physics
Skating on ice is possible because

The surface of ice is smooth
Ice is cold
The pressure on the ice due to skate melts the ice by lowering its melting point forming a thin film of water
The pressure on the ice due to skate raises its melting point

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Physics
Planets do not twinkle because

They are nearer to earth and hence we receive a greater amount of light.
They emit light of a constant intensity
They are very far away from the earth resulting in decrease in intensity of light
Their distance from the earth does not change with time

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

Work done in rolling is more than in lifting.
Work done in rolling a stone is less than in lifting it.
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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