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Common Observations
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Common Observations
Rainbow is produced by tiny rain drops suspended in front of sun rays as a result of:
Reflection and interference
Refraction and dispersion
Interference
Reflection, refraction and dispersion
Author:
rikazzz
Comment
Common Observations
If a boy sitting in a railway train, moving at constant velocity, throws a ball straight up into the air.
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
Author:
rikazzz
Comment
Common Observations
A greenish yellow colour is seen on a boiled egg. This is due to:
Oxidation of some vitamins in the egg
Oxidation of sulphur in the egg
Formation of some iron compounds
None of these
Author:
rikazzz
Comment
Common Observations
Air is completely removed from an electric bulb to prevent:
Oxidation of tungsten filament
Bursting of the bulb
Loss of light due to absorption
None of these
Author:
rikazzz
Comment
Common Observations
A lighted candle gets extinguished when covered with a tumbler because of:
Adequate supply of air
Inadequate supply of air
Presence of non-luminous matter
None of these
Author:
rikazzz
Comment
Common Observations
When milk is churned, the cream is separated from it due to:
Frictional force
Cohesive force
Gravitational force
Centrifugal force
Author:
rikazzz
Comment
Common Observations
Nights are cooler in the deserts because:
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
Author:
rikazzz
Comment
Common Observations
The water in an open pond remains cool even in hot summer because:
Of continuous evaporation of water
Water absorbs heat less rapidly than the atmosphere
Water radiates heat more rapidly than the atmosphere
None of these
Author:
rikazzz
Comment
Common Observations
The wet camel hair, when brushed, cling together due to:
Elasticity
Adhesion
Virosis
Surface tension
Author:
rikazzz
Comment
Common Observations
Pressure cooker is fast in cooking rice because:
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
Author:
rikazzz
Comment
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