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In which of the following cases is the work done?

Seema is swimming in a pond.
a donkey is carrying a load on its back
A windmill is lifting water from a well.
a green plant is carrying out photosynthesis
an engine is pulling a train
Food grains are getting dried in the sun.
A sailboat is moving due to wind energy.

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a, c, e, g

a, c, d

a, b, c, e, g

a, c, e, f

answer is A.

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Detailed Solution

The correct option is

1

.
From the above options provided, work is done in options

a, c, e, g

.
In option

a

, Seema is doing work because a force is applied which causes a displacement.
In option

b

, the donkey is not doing any work because a force is applied but it didn’t cause any displacement.
In option

c

, the windmill is doing work because a force is exerted by the windmill which causes a displacement of the water.
In option

d

, the green plants are not doing any work because neither force is applied nor displacement is caused.
In option

e

, the engine is doing work because a force is exerted by the engine to pull the train which causes a displacement of the train.
In option

f

, no work is done by the foodgrain because neither force is applied nor displacement is caused.
In option

g

, the sailboat is doing work because a force is exerted on it by the wind which causes a displacement.

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