Physics
It is more difficult to walk on a sandy road than on a concrete road because

the sand is grainy but concrete is smooth.
sand is soft and concreter is hard.
the friction between sand and feet is less than that between concrete and feet.
the friction between sand and feet is more than that between concrete and feet.

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Physics
Which of the following events occurred first ?

Albert Einstein propounded the General Theory of Relativity
Max Planck unveiled the Quantum Theory
Madame Marie Curie became the first woman Nobel Prize winner
Marconi first tranmitted a wireless signal

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