Common Observations

Reflection and interference

Refraction and dispersion

Interference

Reflection, refraction and dispersion

The ball will fall in front of him

The ball will fall behind him

The ball will fall into his hand

The ball will not return downward

Oxidation of some vitamins in the egg

Oxidation of sulphur in the egg

Formation of some iron compounds

None of these

Oxidation of tungsten filament

Bursting of the bulb

Loss of light due to absorption

None of these

Adequate supply of air

Inadequate supply of air

Presence of non-luminous matter

None of these

Frictional force

Cohesive force

Gravitational force

Centrifugal force

Sand radiates heat less quickly as compared to earth

Sand radiates heat more quickly as compared to earth

The sky is generally clear

The sky is generally cloudy

Of continuous evaporation of water

Water absorbs heat less rapidly than the atmosphere

Water radiates heat more rapidly than the atmosphere

None of these

Elasticity

Adhesion

Virosis

Surface tension

It lets the steam escape

High pressure raises the boiling point of water

High pressure crushes the hard covering of rice grains

None of these