M.C.Q (1 Marks)

MCQ 11 Mark

The height $h$ of the liquid column in a capillary tube on Earth is $h$. On the Moon, where the acceleration due to gravity of earth is $1/6.$ This height is :

A
$h/6$
✓
$6h$
C
$h$
D
zero

Answer

Correct option: B.

$6h$

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MCQ 21 Mark

If a liquid neither falls nor rise in a capillary tube, then the angle of contact between the liquid and the capillary material will be:

A
$0^{\circ}$
B
$45^{\circ}$
✓
$90^{\circ}$
D
$120^{\circ} $

Answer

Correct option: C.

$90^{\circ}$

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MCQ 31 Mark

If work W is required to make an air bubble of volume V from a soap solution, then a bubble of volume 2V can be made from the same solution. The value of work done in making it will be:

A
$W$
B
$\sqrt{2} W$
✓
$4^{1 / 3} W$
D
$2^{1 / 3} W$

Answer

Correct option: C.

$4^{1 / 3} W$

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MCQ 41 Mark

Surface tension at critical temperature becomes:

A
infinite
✓
zero
C
negative and definite
D
positive and definite

Answer

Correct option: B.

zero

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MCQ 51 Mark

Due to which quality is it possible to write on the blackboard with chalk?

A
Cohesive force
✓
Adhesive force
C
Surface tension
D
Viscosity

Answer

Correct option: B.

Adhesive force

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MCQ 61 Mark

The height of water rising in a capillary will be:

A
maximum at $4^{\circ} C$
B
maximum at $2^{\circ} C$
✓
minimum at $4^{\circ} C$
D
minımum at $0^{\circ} C$.

Answer

Correct option: C.

minimum at $4^{\circ} C$

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MCQ 71 Mark

How much work is required to making a soap bubble solution whose radius is r?

A
$4 \pi r^2 T$
✓
$8 \pi r^2 T$
C
$2 \pi r^2 T$
D
$\pi r^2 T$

Answer

Correct option: B.

$8 \pi r^2 T$

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MCQ 81 Mark

When the capillarly tube is inserted into water, the value of pressure difference between the points above and below the meniscus will be:

A
$\frac{4 T}{r}$
✓
$\frac{2 T}{r}$
C
${2 T}{r}$
D
$4 T r$

Answer

Correct option: B.

$\frac{2 T}{r}$

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MCQ 91 Mark

If the ratio of radii of two liquid drops is 1 : 2 then the ratio of their pressure excess will be

A
1 : 2
✓
2 : 1
C
1 : 4
D
4 : 1

Answer

Correct option: B.

2 : 1

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MCQ 101 Mark

A liquid will not wet the surface of a solid, if the angle of contact is:

A
$0^{\circ} $
B
$45^{\circ} $
C
$60^{\circ}$
✓
obtuse angle

Answer

Correct option: D.

obtuse angle

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MCQ 111 Mark

Angle of contact by adding detergent to liquid:

A
increase
✓
decrease
C
unchaged
D
cannot say anything definite

Answer

Correct option: B.

decrease

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MCQ 121 Mark

Water is flowing in a horizontal pipe of unequal cross-section. At the narrow place in the pipe there will be:

A
velocity is high, pressure is high
B
velocity is low, pressure is high
✓
velocity is high, pressure is low
D
velocity is low, pressure is low

Answer

Correct option: C.

velocity is high, pressure is low

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MCQ 131 Mark

On decreasing the temperature, surface tension:

✓
Increases
B
Decreases
C
Remains unchanged
D
None of these

Answer

Correct option: A.

Increases

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MCQ 141 Mark

Surface tension of liquid:

A
increase with area
B
decrease with area
C
increase with temperature
✓
decrease with temperature

Answer

Correct option: D.

decrease with temperature

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MCQ 151 Mark

The radius of a pipe of unequal section varies from $r_1$ to $r_2$. If the velocity of flow of fluid in the pipe changes from $v_1$ to $v_2$ then $\frac{v_1}{v_2}$ is equal to :

A
$r_1^2 / r_2^2$
✓
$r_2^2 / r_1^2$
C
$r_1 / r_2$
D
$1$

Answer

Correct option: B.

$r_2^2 / r_1^2$

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MCQ 161 Mark

Water enters a pipe A with velocity v and in the vertical part of the pipe rise to a height h. If the density of water is d then the velocity v will be :

A
$2gh$
B
$\sqrt{d g h}$
✓
$\sqrt{2 g h}$
D
$\sqrt{g h}$

Answer

Correct option: C.

$\sqrt{2 g h}$

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MCQ 171 Mark

Bernoulli's principle is related to:

A
viscosity
B
surface tension
✓
flow of fluid
D
molecular structure of liquids.

Answer

Correct option: C.

flow of fluid

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MCQ 181 Mark

The rate of flow of water in a pipe at pressure P is Q. If the radius of the tube is reduced to half and the pressure is 2P, then the rate of flow will be:

A
$4Q$
B
$\frac{ Q ^2}{4}$
C
$Q/4$
✓
$Q/8$

Answer

Correct option: D.

$Q/8$

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MCQ 191 Mark

The value of Reynolds number for a narrow tube is:

A
10
B
100
✓
1000
D
10000

Answer

Correct option: C.

1000

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MCQ 201 Mark

According to Reynolds, what will be the value of critical velocity?

✓
$\frac{R \eta}{\rho D }$
B
$\frac{ RD }{\rho \eta}$
C
$\frac{\rho D }{ R \eta}$
D
$\frac{\rho D v C }{\eta}$

Answer

Correct option: A.

$\frac{R \eta}{\rho D }$

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MCQ 211 Mark

The conclusion of Bernoulli's theorem is:

A
Pascal's law
✓
Torricelli's theorem
C
Hooke's law
D
Stokes' law

Answer

Correct option: B.

Torricelli's theorem

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MCQ 221 Mark

Viscosity of gas on increases of temperature:

✓
increases
B
decreases
C
remain unchanged
D
none of these

Answer

Correct option: A.

increases

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MCQ 231 Mark

Highest viscosity will be:

✓
of mercury
B
of water
C
of oxygen
D
of hydrogen

Answer

Correct option: A.

of mercury

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MCQ 241 Mark

Liquid pressure depends:

A
only on depth
B
only on density
C
only on acceleration due to gravity
✓
on all three depth density and acceleration due to gravity

Answer

Correct option: D.

on all three depth density and acceleration due to gravity

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MCQ 251 Mark

Which statement is incorrect:

A
The pressure of the liquid at the upper free surface of the liquid is zero.
✓
The pressure of a liquid filled in a container remain the same at all points.
C
The pressure of a liquid remains the same at all points in a horizontal plane.
D
The pressure of a liquid on the plane does not depend on its area.

Answer

Correct option: B.

The pressure of a liquid filled in a container remain the same at all points.

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MCQ 261 Mark

The energy of a flowing liquid is:

A
only pressure energy
B
only kinetic energy
C
only potential energy
✓
All of the above

Answer

Correct option: D.

All of the above

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MCQ 271 Mark

Bernoulli's Principle is based on :

A
Theory of conservation of energy
✓
Theory of conservation of momentum
C
Theory of conservation of mass
D
All of the above

Answer

Correct option: B.

Theory of conservation of momentum

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MCQ 281 Mark

If the ratio of cross-sections of a tube of unequal radius at two places is $1: 2$, then for an in compressible fluid the ratio of the velocities of the fluid entering and exiting the tube will be :

A
1 : 2
✓
2 : 1
C
1 : 4
D
1 : 1

Answer

Correct option: B.

2 : 1

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MCQ 291 Mark

If the ratio of cross-sections of a tube of unequal radius at two places is 1 : 2, then for an incompressible fluid the ratio of the mass of the fluid entering and exiting the tube will be :

A
1 : 2
B
2 : 1
C
1 : 4
✓
1 : 1

Answer

Correct option: D.

1 : 1

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MCQ 301 Mark

On what does the coefficient of viscosity of a liquid depends?

A
At nature of liquid
B
At temperature
C
At pressure
✓
All of these

Answer

Correct option: D.

All of these

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Physics M.C.Q (1 Marks)

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