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Question

Viscosity causes

A
part of the internal energy of a fluid to be converted to kinetic energy.
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B
part of the kinetic energy of a fluid to be converted to internal energy.
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C
part of the kinetic energy of a fluid to be converted to electrical energy.
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D
part of the potential energy of a fluid to be converted to internal energy.
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Solution

The correct option is A part of the kinetic energy of a fluid to be converted to internal energy.
Viscosity is frictional force working between layers of fluid, it reduces the speed of fluid and thus decreases its kinetic energy.
Heat generated (as a result of decrease in kinetic energy) by frictional force increases the internal energy of the fluid.

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