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

Quartz clocks
Pulsars
Atomic clocks
White dwarfs

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Physics
A drop of liquid assumes spherical shape because:

A sphere has the largest surface area for a given volume
Inter molecular forces are weak in liquids
Intermolecular forces are strong in liquids
A sphere has the least surface area for a given volume

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Physics
In the gamma decay of a nucleus

Both the mass number and the atomic number of the nucleus change
Neither the mass number nor the atomic number of the nucleus changes
The mass number of the nucleus does not change whereas its atomic number changes
The mass number of the nucleus changes whereas its atomic number does not change

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