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

Atomic clocks
Pulsars
Quartz clocks
White dwarfs

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Physics
To resolve an object in an electron microscope,

The wavelength of the electrons must be greater than the diameter of the object.
The wavelength of the electrons must be close to the diameter of the object
Both A & B
None of these

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Physics
The bats can fly in the dark because

They generate flashes of light
They generate ultrasonic sound waves
They have weak legs and are likely to be attacked by predators
They can see the objects in darkness

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