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

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

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Physics
Which of the following occurred first ?

Max Planck unveiled the Quantum Theory
Wright Brothers successfully flew an aircraft
Albert Einstein propounded the General Theory of Relativity
Guglielmo Marconi sent out the first wireless signals

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