## Physics It is easier for a man to swim in sea water, than in river water because

The sea is wider than the river
The density of sea water is more than the density of river water
The density of sea water is lesser than the density of river water
The sea is-deeper than the river

## Physics The blue colour of water in the sea is due to

Reflection of blue light by impurities in sea water
Reflection of blue sky by sea water
Scattering of blue light by water molecules
Absorption of other colours except blue by water molecules

## Physics A passenger standing in a bus is thrown outward when the bus takes a sudden turn. This happens due to

Change in acceleration
Inertia of motion
Change in momentum
Outward pull on him

## Physics When milk is churned, the cream separates from it due to:

Frictional force
Viscous forces
Gravitational force
Centrifugal force

## Physics The tidal waves on sea is mainly due to

None of these
Gravitational Effect of Moon on Earth
Gravitational Effect of Earth on Moon
Gravitational Effect of Sun on Earth

Noise
Air
Water
Thermal