Physics
When a detergent is added to pure water, its surface tension

Remains constant
Increases
Decreases
Becomes infinite

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Physics
It is easier to roll a barrel full of coal tar than to pull it because

coal tar is a liquid and it flows in the barrel when it is rolled
more surface area of the barrel is in contact with the road when it is pulled
the rolling friction is much less than the sliding friction
the full weight of the barrel comes into play when it is pulled

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

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

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