Assertion: Surface tension of liquid decreases with increase in temperature.

Reason: Cohesive force between liquid molecules increase with increase in the temperature.

Shape of meniscus for a liquid of zero angle of contact is

Assertion: A thin stainless steel needle can lay floating on still water surface.

Reason: Any object floats when the buoyant force balances the weight of the object.

Assertion: Surface energy of an oil drop is same whether placed on glass or water surface.

Reason: Surface energy is dependent only on the properties of oil.

Assertion: When temperature of a liquid is increased, then its surface tension decreases.

Reason: Kinetic energy and oscillations of molecules increases, so intermolecular force of attraction decreases.

Assertion: Surface tension of water is larger among fluids.

Reason: There is hydrogen bond in water molecules, so its surface tension is larger than other fluids.