MEDIUM

11th ICSE

IMPORTANT

Earn 100

Air is streaming past a horizontal aeroplane wing such that its speed is $120 m s^{- 1}$ at the upper surface and $90 m s^{- 1}$ at the lower surface. If the density of air is $1.3 k g m^{- 3}$ , find the difference in pressures between the two surfaces of the wing. If the wing is $10 m$ long and has an average width of $2 m$ , then calculate the gross lift on it.

Important Questions on Motion in Fluids : Viscosity

MEDIUM

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 17 - Motion in Fluids : Viscosity>NUMERICALS>Q 10

A water tank has a hole in its wall at a distance of

40 m

below the free surface of water. Compute the velocity of efflux of water from the hole. If the radius of the hole be

1 m m

, find the rate of flow of water.

MEDIUM

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 17 - Motion in Fluids : Viscosity>NUMERICALS>Q 11

There is a

1 m m

thick layer of oil between a flat plate of area

10^{- 2} m^{2}

and a big plate. How much force is required to move the plate with a velocity of

1.5 c m s^{- 1}

. The coefficient of viscosity of oil is

1 p o i s e

MEDIUM

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 17 - Motion in Fluids : Viscosity>NUMERICALS>Q 12

A square plate of

10 cm

side moves parallel to another plate with a relative velocity of

10 cm s^{- 1}

, both plates immersed in water. If the viscous force is

2 \times 10^{- 3} N

, calculate the perpendicular distance between the plates if viscosity of water,

n = 0.01 poise

MEDIUM

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 17 - Motion in Fluids : Viscosity>NUMERICALS>Q 13

Water is flowing through a horizontal tube

4 k m

in length and

4 c m

in radius at a rate of

20 l i t r e s^{- 1}

. Calculate the pressure required to maintain the flow in terms of the height of mercury column.

HARD

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 17 - Motion in Fluids : Viscosity>NUMERICALS>Q 14

The level of blood in a bottle used to give blood to a patient is

1.3 m

high above the needle which is

3 c m

in length and has an internal diameter of

0.36 m m

. If

4.5 c m^{3}

of blood is passing through the needle per minute, calculate the viscosity of blood. The density of blood is

1020 k g m^{- 3}

. Ignore fall in the level of blood in the bottle.

HARD

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 17 - Motion in Fluids : Viscosity>NUMERICALS>Q 15

What will be the terminal velocity of a steel ball of radius

2 m m

in glycerine?

HARD

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 17 - Motion in Fluids : Viscosity>NUMERICALS>Q 16

An iron ball of radius

0.3 c m

falling through a column of oil of density

0.94 g c m^{- 3}

attains a terminal velocity of

0.5 c m s^{- 1}

. What is the coefficient of viscosity of the oil? The density of iron is

7.8 g c m^{- 3}

HARD

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 17 - Motion in Fluids : Viscosity>NUMERICALS>Q 17

A steel shot of diameter

2 m m

is dropped in a viscous liquid filled in a drum. Find the terminal speed of the shot. Density of the material of the shot is

8.0 \times 10^{3} k g m^{- 3}

, density of liquid is

1.0 \times 10^{3} k g m^{- 3}

. Coefficient of viscosity of liquid is

1.0 k g m^{- 1} s^{- 1}

Important Questions on Motion in Fluids : Viscosity

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