Physics
Second and third class levers are differentiated by

The presence of multiple loads
The type of fulcrum present
The location of the fulcrum
The location of the load

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Physics
Stars twinkle because

the distance of the stars from the earth changes with time.
the refractive index of the different layers of the earth's atmosphere ch
the intensity of light emitted by them changes with time.
None of these

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Physics
A drop of liquid assumes spherical shape because:

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

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