Physics
Which of the following are used for accurately measuring very small time intervals ?

Pulsars
White dwarfs
Atomic clocks
Quartz clocks

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

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

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