Mechanical Properties of Fluids Test

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Mechanical Properties of Fluids Test - 13

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Question 1
1 / -0

If a liquid does not wet glass, its angle of contact is:

A
Zero

B
Acute

C
Obtuse

D
Right angle

Solution

If a liquid does not wet glass, this means liquid-liquid interaction is more than liquid-solid interaction leading us to obtuse angle of contact.
Question 2
1 / -0

When a plane moves along the runway, the air above the wing speeds up more, So the pressure

A
Lowers

B
Increases

C
Raises

D
No Pressure

Solution

According to Bernoulli's theorem $$ P + \rho gh+ \dfrac{1}{2}\rho v^2= constant$$
$$\implies$$ When $$v$$ is increases, then pressure $$(P)$$ is lowers.
Question 3
1 / -0

The ordinary pressure of air surrounding us is

A
15 pounds

B
16 pounds

C
14.2 pounds

D
14.7 pounds

Solution

$$Answer:-$$ D
The ordinary pressure of the air surrounding us is 14.7 pounds per square inch, but the pressure can change when the wind blows or an object, like a car or airplane, accelerates.
One important principle to remember is that wherever the air pressure is higher, there will be a stronger force or push against an object. It’s also helpful to know that when an air particle speeds up, it actually “pushes” less. Imagine that fast-moving air particles are in so much of a hurry that they don’t have time to apply force. This principle is used in airplane wings to make planes fly. When a plane moves along the runway, the air above the wing speeds up more, lowering the pressure, so that the air below the wing can push the plane upward.
Question 4
1 / -0

Choose the correct statement among the following

A
The upper surface of a stationary liquid is always horizontal.

B
The pressure of a given liquid is directly proportional to the depth of the liquid.

C
Pressure at a given depth inside a stationary liquid is different at all points on the horizontal plane.

D
Both (A) and (B)

Solution

Since liquids also have mass hence pressure increases when we go in the depth & this pressure is called hydrostatic pressure.
Question 5
1 / -0

When two capillary tubes of different diameters are dipped vertically, the rise of the liquid is :

A
same in both the tubes

B
more in tube of larger diameter

C
less in the tube of smaller diameter

D
more in the tube of smaller diameter

Solution

The rise of liquid columns in cappileries $$15$$ related to its radius as $$h=\dfrac { 2Tcos\theta }{ PgR } $$
So rise is more for the tube of smaller diameter.
Question 6
1 / -0

Vacuum above the mercury level in a barometer is called:

A
Torricelli vacuum

B
Archimedes vacuum

C
newtons vacuum

D
Pascal vacuum

Solution

A barometer was first invented by Torricelli . When an empty inverted glass tube is dipped in mercury tub, mercury rises at some height , in the tube due to atmospheric pressure . Above mercury there is a vacuum , which is called Torricelli's vacuum .
Question 7
1 / -0

The correct assumption(s) made to perform a venturi-meter experiment is(are):

A
that Bernoulli's theorem holds good

B
that equation of continuity is maintained

C
that the fluid used is highly incompressible

D
that all of the above are true

Solution

Venturi-meter is a device used to measure the rate of flow of a liquid through pipes .Its working is based on Bernoulli's principle. To get the rate of flow of a liquid in a pipe by a Venturi-meter, both Bernoulli's theorem and equation of continuity are used and we know that equation of continuity works when the liquid is considered as incompressible (so that, its density doesn't change anywhere in its path of flow).
Hence, all the given assumptions are true.
Question 8
1 / -0

The height up to which water will rise in a capillary tube will be

A
Minimum when water temperature is $$4^{\circ}C$$

B
Maximum when water temperature is $$4^{\circ}C$$

C
Maximum when water temperature is $$0^{\circ}C$$

D
Minimum when water temperature is $$0^{\circ}C$$

Solution

The height of rise in capillary, $$h = \dfrac {2T\cos \theta}{r\rho g}$$
For water, the density is maximum at $$4^{\circ}C$$, so height is minimum at $$4^{\circ}C$$.
Question 9
1 / -0

For a liquid which is rising in a capillary, the angle of contact is

A
Obtuse

B
Acute

C
$$180^o$$

D
$$90^o$$

Solution

If angle of contact is acute, liquid rises in a capillary tube whereas if angle of contact is obtuse, liquid is depresses in a capillary tube.
Since here, liquid is rising, therefore, angle of contact is acute.
Question 10
1 / -0

When the temperature is increased the angle of contact of a liquid

A
increases

B
decreases

C
remains the same

D
first increases and then decreases

Solution

When the temperature is increased the angle of contact of a liquid because
Cohesive force decreases so angle of contact decreases.

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Mechanical Properties of Fluids Test - 13

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Mechanical Properties of Fluids Test - 13

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Question 1

Zero

Acute

Obtuse

Right angle

Solution

Question 2

Lowers

Increases

Raises

No Pressure

Solution

Question 3

15 pounds

16 pounds

14.2 pounds

14.7 pounds

Solution

Question 4

The upper surface of a stationary liquid is always horizontal.

The pressure of a given liquid is directly proportional to the depth of the liquid.

Pressure at a given depth inside a stationary liquid is different at all points on the horizontal plane.

Both (A) and (B)

Solution

Question 5

same in both the tubes

more in tube of larger diameter

less in the tube of smaller diameter

more in the tube of smaller diameter

Solution

Question 6

Torricelli vacuum

Archimedes vacuum

newtons vacuum

Pascal vacuum

Solution

Question 7

that Bernoulli's theorem holds good

that equation of continuity is maintained

that the fluid used is highly incompressible

that all of the above are true

Solution

Question 8

Minimum when water temperature is $$4^{\circ}C$$

Maximum when water temperature is $$4^{\circ}C$$

Maximum when water temperature is $$0^{\circ}C$$

Minimum when water temperature is $$0^{\circ}C$$

Solution

Question 9

Obtuse

Acute

$$180^o$$

$$90^o$$

Solution

Question 10

increases

decreases

remains the same

first increases and then decreases

Solution

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