Physics
Surface tension in a liquid is due to :

Gravitational force between molecules
Cohesive force between molecules
Adhesive force betweenmolecules
Electrical force between molecules.

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Physics
Superconductors are substances which

conduct electricity at low temperature
offer high resistance to the flow of current
conduct electricity at high temperatures
offer no resistance to the flow of electricity

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

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

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