Physics
Solar eclipse will take place when

the sun is between the moon and the earth
the moon does not lie on the line joining the sun and the earth
the moon is between the sun and the earth
the earth is between the moon and the sun

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Physics
The blue colour of sky is due to

Scattering of longer wavelengths of sunlight in the atmosphere
Reflection of sunlight
Scattering of shorter wavelengths of sunlight in the atmosphere
Refraction of sunlight

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Physics
A drop of liquid assumes spherical shape because:

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

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