EASY

11th West Bengal Board

IMPORTANT

Earn 100

A body when immersed in a liquid floats with $\frac{1}{4} t h$ of its volume above the liquid surface. The body is taken to depth $d cm$ of liquid and then released. Show that the body will reach the surface after $\sqrt{\frac{6 x}{g}}$ second from the time of release.

Important Questions on Fluid Statics

EASY

11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 13 - Fluid Statics>EXERCISE>Q 16

A wooden block

A

is kept immersed in a liquid contained in a vessel by a thread connected to the bottom of the vessel. The densities of wood and liquid are

ρ

and

ρ_{1} (ρ < ρ_{1})

. When the system is at rest, the tension in the thread is

T

. If the vessel now starts moving upward with acceleration

a

, find the new tension.

EASY

11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 13 - Fluid Statics>EXERCISE>Q 17

A solid ball of density half that of water falls freely under gravity from a height of

19.6 m

and then enters water. Upto what depth will the ball go ? How much time will it take to come to the water surface again ? Neglect air resistance and velocity effects in water.

EASY

11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 13 - Fluid Statics>EXERCISE>Q 18

W_{1}

and

W_{2}

be the weights of a given body when it is immersed in fluids of specific gravities

S_{1}

and

S_{2}

respectively, show that its weight in vacuum is

(W_{1} S_{2} - W_{2} S_{1}) / (S_{2} - S_{1})

EASY

11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 13 - Fluid Statics>EXERCISE>Q 19

A body weighs

w_{1}, w_{2}

and

w_{3}

when immersed in three liquids of specific gravities

S_{1}, S_{2}

and

S_{3}

respectively. Show that

S_{3} (w_{1} - w_{2}) + S_{2} (w_{3} - w_{1}) + S_{1} (w_{2} - w_{3}) = 0

MEDIUM

11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 13 - Fluid Statics>EXERCISE>Q 20

A barometer contains some air above the mercury whose height is

70 cm

. The top of the barometer is

80 cm

above the mercury level in the cistern and the atmospheric pressure is

75 cm

H g

. What is the atmospheric pressure when this barometer reads

67.5 cm

MEDIUM

11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 13 - Fluid Statics>EXERCISE>Q 21

A helicopter is flying at an altitude of

600 m

. The average density of air below the copter is

1.2 {kgm}^{- 3}

and the atmospheric pressure on the surface of the earth is

1013

millibar. What is the air pressure in the helicopter ?

EASY

11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 13 - Fluid Statics>EXERCISE>Q 22

An ideal gas is trapped between a mercury column and the closed lower end of a narrow vertical tube of uniform bore. The upper end of the tube is open to atmosphere (Atmospheric pressure

= 76 cm

H g

). The lengths of the mercury and the trapped gas columns are

20 cm

and

43 cm

respectively. What will be the length of the gas column when the tube is tilted slowly in a vertical plane through an angle of

60 °

? Assume constant temperature all through.

HARD

11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 13 - Fluid Statics>EXERCISE>Q 23

A tube

100 cm

long, kept vertical with its open end downward is inserted into mercury contained in a vessel. If the column of mercury entering into the tube be

20 cm

long, what length of the tube will remain outside the mercury ? Atmospheric pressure is

76 cm

of mercury.

A body when immersed in a liquid floats with 14th of its volume above the liquid surface. The body is taken to depth d cm of liquid and then released. Show that the body will reach the surface after 6xg second from the time of release.

Important Questions on Fluid Statics

Learn and Prepare for any exam you want !

A body when immersed in a liquid floats with $\frac{1}{4} t h$ of its volume above the liquid surface. The body is taken to depth $d cm$ of liquid and then released. Show that the body will reach the surface after $\sqrt{\frac{6 x}{g}}$ second from the time of release.