EASY

Earn 100

Explain sphere of influence.

Important Questions on Mechanical Properties of Fluids

MEDIUM

Physics>Mechanics>Mechanical Properties of Fluids>Surface Energy

A water drop of diameter

2 cm

is broken into

64

equal droplets. The surface tension of water is

0.075 N m^{- 1}

. In this process the gain in surface energy will be

MEDIUM

Physics>Mechanics>Mechanical Properties of Fluids>Surface Energy

A drop of radius

R

breaks into

n

equal drops. What is the ratio of total final surface energy to initial surface energy?

EASY

Physics>Mechanics>Mechanical Properties of Fluids>Surface Energy

Two droplets coalesce in a single drop. In this process _______.

MEDIUM

Physics>Mechanics>Mechanical Properties of Fluids>Surface Energy

Surface tension of a soap bubble is

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

. Work done to increase the radius of soap bubble from

3.5 cm

7 cm

will be : [Take

π = \frac{22}{7}

]

MEDIUM

Physics>Mechanics>Mechanical Properties of Fluids>Surface Energy

Work done in increasing the size of a soap bubble from radius of (

3

5

)

cm

is nearly (surface tension of soap solution

= 0.03 N m^{- 1}

)

MEDIUM

Physics>Mechanics>Mechanical Properties of Fluids>Surface Energy

If $1000$ droplets of water of surface tension $0.07 N m^{- 1}$ . having same radius $1 mm$ each, combine to from a single drop. In the process the released surface energy is-

$(Take π = \frac{22}{7})$

EASY

Physics>Mechanics>Mechanical Properties of Fluids>Surface Energy

Water does not wet an oily glass because

EASY

Physics>Mechanics>Mechanical Properties of Fluids>Surface Energy

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

MEDIUM

Physics>Mechanics>Mechanical Properties of Fluids>Surface Energy

Two small drops of mercury each of radius

R

coalesce to form a large single drop. The ratio of the total surface energies before and after the change is

MEDIUM

Physics>Mechanics>Mechanical Properties of Fluids>Surface Energy

Work done in increasing the size of a soap bubble from a radius of

3 cm

5 cm

is nearly (surface tension of soap solution

= 0.05 {Nm}^{- 1}

)

MEDIUM

Physics>Mechanics>Mechanical Properties of Fluids>Surface Energy

A mercury drop of radius

10^{- 3} m

is broken into

125

equal size droplets. Surface tension of mercury is

0.45 N m^{- 1}

. The gain in surface energy is:

HARD

Physics>Mechanics>Mechanical Properties of Fluids>Surface Energy

A large number of liquid drops each of radius

r

coalesce to form a single drop of the radius

R

. The energy released in the process is converted into kinetic energy of the big drop so formed. The speed of the big drop is (given surface tension of the liquid

T

, density

ρ

)

EASY

Physics>Mechanics>Mechanical Properties of Fluids>Surface Energy

The amount of energy required to form a soap bubble of radius

2 cm

from a soap solution is nearly: (surface tension of soap solution =

0.03 N m^{- 1}

)

MEDIUM

Physics>Mechanics>Mechanical Properties of Fluids>Surface Energy

A spherical drop of liquid splits into

1000

identical spherical drops. If

u_{i}

is the surface energy of the original drop and

u_{f}

is the total surface energy of the resulting drops, the (ignoring evaporation),

\frac{u_{f}}{u_{i}} = (\frac{10}{x})

. Then value of

x

is ______:

EASY

Physics>Mechanics>Mechanical Properties of Fluids>Surface Energy

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

MEDIUM

Physics>Mechanics>Mechanical Properties of Fluids>Surface Energy

When two soap bubbles of radii

a

and

b

(b > a)

coalesce, the radius of curvature of common surface is:

EASY

Physics>Mechanics>Mechanical Properties of Fluids>Surface Energy

A soap bubble of radius

R

is blown. After heating the solution, a second bubble of radius

2 R

is blown. The work required to blow the second bubble in comparison to that required for the first bubble is

MEDIUM

Physics>Mechanics>Mechanical Properties of Fluids>Surface Energy

Two small drops of mercury each of radius

R

coalesce to form a single large drop. The ratio of total surface energy before and after the change is

MEDIUM

Physics>Mechanics>Mechanical Properties of Fluids>Surface Energy

A liquid does not wet the solid surface if angle of contact is:

MEDIUM

Physics>Mechanics>Mechanical Properties of Fluids>Surface Energy

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

Explain sphere of influence.

Important Questions on Mechanical Properties of Fluids

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