Physics
The force between charged particles is called as:

Gravitational Force
Nuclear Force
Electromagnetic Force
Centrifugal Force

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Physics
An egg sinks in soft water but floats in a concentrated solution of salt because

Water has high surface tension
Egg absorbs salt from the solution and expands
Albumin dissolves in salt solution and egg becomes lighter
The density of salt solution exceeds the density of eggs

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Physics
Rainbows are produced when sunlight :

Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction and internal reflection.
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction
Incident on raindrops hanging in the atmosphere is dispresed after suffering reflection.
None of the given statements is correct.

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Physics
Planets are

luminous heavenly bodies that do not twinkle
luminous heavenly bodies that twinkle
luminous heavenly bodies revolving around a star
non-luminous heavenly bodies

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