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Q.

The coefficient of viscosity for hot air is

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a

Greater than the coefficient of viscosity for cold air

b

Smaller than the coefficient of viscosity for cold air

c

Same as the coefficient of viscosity for cold air

d

Increases or decreases depending on the external pressure

answer is A.

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Detailed Solution

If the temperature is increased, then the gases move in random motion, then the velocity gradient of the gases increase. Thus the viscous force and the coefficient of viscosity increase.
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The coefficient of viscosity for hot air is