Viscosity of a liquid - Stoke's method (Viva voce) : Class 11 : Physics : Amrita Online Lab

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Viscosity of a liquid - Stoke's method

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	1)	Which property measures the resistance of a liquid to flow ?
		Viscosity Density Solubility Volume

	2)	Which of the following is the correct statement?
		Viscous force is a frictional force Both liquids and gases exhibit viscosity All of the above Viscous force is the force offered by the adjacent liquid layers

	3)	The rain drops falling from the sky neither hit us hard, nor make holes on the ground. Why?
		Because they move with a variable acceleration Because they move with a constant acceleration Because they move with a constant velocity Because they move with a variable speed

	4)	Two balls whose radii are in the ratio 1:2 fall from a height of 50 km. What will be the ratio of their terminal velocities ?
		4:1 1:9 9:1 1:4

	5)	What is the unit of coefficient of viscosity?
		Nsm^-2 Nsm^2 N/m^2 None of these

	6)	Cooking oil appears to move more fluidly upon a frying pan after being heated on a stove. Why?
		Viscosity of oil increases with increase in temperature None of these Viscosity decreases with increase in temperature Viscosity becomes zero as the temperature increases

	7)	Which of the following factors are responsible for the viscous force acting on a spherical body?
		Radius of the spherical body Coefficient of viscosity of the liquid Terminal velocity of the spherical body All the above

	8)	Calculate the viscous force on a ball of radius 1 mm moving through a liquid of viscosity 0.2 Nsm^-2 at a speed of 0.07 m/s?
		None of these 2.6310^-4 N 0.26310^-4 N 2.63 N

	9)	What happens to the viscosity of a liquid when pressure increases ?
		Decreases Become zero Remains constant Increases

	10)	Choose the incorrect statement from the following.
		Viscous force is directly proportional to terminal velocity. Viscous force acts in opposite direction of velocity. Coefficient of viscosity depends on density of the liquid. Coefficient of viscosity does not depend on terminal velocity.

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