EASY

Earn 100

Cohesive force is _______ force.

50% studentsanswered this correctly

Important Questions on Mechanical Properties of Fluids

EASY

Physics>Mechanical Properties of Matter>Mechanical Properties of Fluids>Surface Tension

When one end of the capillary is dipped in water, the height of the water column is

h

. The upward force of

105 dyne

due to surface tension is balanced by the force due to the weight of the water column. The inner circumference of the capillary is
(Surface tension of water

= 7 \times 10^{- 2} N m^{- 1})

EASY

Physics>Mechanical Properties of Matter>Mechanical Properties of Fluids>Surface Tension

The radius

R

of the soap bubble is doubled under isothermal condition. If

T

be the surface tension of the soap bubble, the work done in doing so is given by

EASY

Physics>Mechanical Properties of Matter>Mechanical Properties of Fluids>Surface Tension

Three liquids of densities,

ρ_{1}, ρ_{2}

and

ρ_{3}

(with,

ρ_{1} > ρ_{2} > ρ_{3})

, having the same value of surface tension,

T

, rise to the same height in three identical capillaries. The angles of contact,

θ_{1}, θ_{2}

and

θ_{3}

obey

EASY

Physics>Mechanical Properties of Matter>Mechanical Properties of Fluids>Surface Tension

Which one of the following statement is correct?

EASY

Physics>Mechanical Properties of Matter>Mechanical Properties of Fluids>Surface Tension

' M'

is the mass of water that rises in a capillary tube of radius

' r'

, then mass of water which will rise in a capillary tube of radius

' 2 r'

is:

EASY

Physics>Mechanical Properties of Matter>Mechanical Properties of Fluids>Surface Tension

A soap bubble having radius of

1 m m

is blown from a detergent solution having a surface tension of

2.5 \times 10^{- 2} N m^{- 1} .

The pressure inside the bubble equals at a point

Z_{0}

below the free surface of water in a container. Taking

g = 10 m s^{- 2},

density of water

= 10^{3} k g m^{- 3},

the value of

Z_{0}

EASY

Physics>Mechanical Properties of Matter>Mechanical Properties of Fluids>Surface Tension

Water rises to a height 'h' in capillary tube. If the length of capillary tube above the surface of water is made less than 'h', then:

EASY

Physics>Mechanical Properties of Matter>Mechanical Properties of Fluids>Surface Tension

A wire of length

10 cm

is gently placed horizontally on the surface of water having a surface tension of

75 \times 10^{- 3} N m^{- 1}

. What force is required to just pull up the wire from the water surface?

EASY

Physics>Mechanical Properties of Matter>Mechanical Properties of Fluids>Surface Tension

In a capillary tube having area of cross-section

A

, the water rises to a height

h

. If the cross-sectional area is reduced to

\frac{A}{9}

, the rise of water in the capillary tube is

EASY

Physics>Mechanical Properties of Matter>Mechanical Properties of Fluids>Surface Tension

Two mercury drops (each of radius

r

) merge to form a bigger drop. The surface energy of the bigger drop, if

T

is the surface tension, is

EASY

Physics>Mechanical Properties of Matter>Mechanical Properties of Fluids>Surface Tension

Pressure inside two soap bubbles are

1.01

and

1.02

atmosphere, respectively. The ratio of their volumes is :

MEDIUM

Physics>Mechanical Properties of Matter>Mechanical Properties of Fluids>Surface Tension

A big water drop is formed by the combination of

n

small water drops of equal radii. The ratio of the surface energy of

n

drops to the surface energy of the big drop is

EASY

Physics>Mechanical Properties of Matter>Mechanical Properties of Fluids>Surface Tension

Two separate soap bubbles of radii

3 \times 10^{- 3} m

and

2 \times 10^{- 3} m

respectively, formed of same liquid (surface tension

65 \times 10^{- 2} N m^{- 1}

) come together to form a double bubble. The radius of interface of double bubble is

EASY

Physics>Mechanical Properties of Matter>Mechanical Properties of Fluids>Surface Tension

A glass capillary tube is of the shape of a truncated cone with an apex angle

α

so that its two ends have cross-sections of different radii. When dipped in water vertically, the water rises in it to a height

h

, where the radius of its cross-section is

b

. If the surface tension of water is

S

, its density is

ρ

, and its contact angle with glass is

θ

, then the value of

h

will be (

g

is the acceleration due to gravity)

Question Image

EASY

Physics>Mechanical Properties of Matter>Mechanical Properties of Fluids>Surface Tension

The surface tension of the soap water solution is

\frac{1}{10 π} N m^{- 1}

. The free energy of the surface layer of a soap bubble of diameter

5 mm

will be

EASY

Physics>Mechanical Properties of Matter>Mechanical Properties of Fluids>Surface Tension

Water rises to a height of

15 mm

in a capillary tube having cross-sectional area

A

. If cross-sectional area of the tube is made

\frac{A}{3}

then the water will rise to a height of

EASY

Physics>Mechanical Properties of Matter>Mechanical Properties of Fluids>Surface Tension

Water rises upto a height

h

in a capillary tube on the surface of the earth. The value of

h

increases, if the capillary tube apparatus is kept

EASY

Physics>Mechanical Properties of Matter>Mechanical Properties of Fluids>Surface Tension

Two light balls are suspended as shown in figure. When a stream of air passes through the space between them, the distance between the balls will

Question Image

EASY

Physics>Mechanical Properties of Matter>Mechanical Properties of Fluids>Surface Tension

A soap bubble of radius

r

is blown up to form a bubble of radius

2 r

under isothermal conditions. If

σ

is the surface tension of the soap solution, the energy spent in the process is

EASY

Physics>Mechanical Properties of Matter>Mechanical Properties of Fluids>Surface Tension

A rectangular film of liquid is extended from

(4 cm \times 2 cm)

(5 cm \times 4 cm)

. If the work done is

3 \times 10^{- 4} J

, the value of the surface tension of the liquid is

Cohesive force is _______ force.

Important Questions on Mechanical Properties of Fluids

Learn and Prepare for any exam you want !