Mechanical Properties of Fluids Test

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Mechanical Properties of Fluids Test - 37

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Weekly Quiz Competition

Question 1
1 / -0

In a surface tension experiment with a capillary tube water rises up to $$0.1 m$$. If the same experiment is repeated on an artificial satellite which is revolving around the earth. The rise of water in a capillary tube will be

A
$$0.1 m$$

B
$$9.8 m$$

C
$$0.98 m$$

D
Full length of capillary tube

Solution

If the experiment of capillary tube is performed in space then, it will rise to fall length of tube due to vaccum around it, i.e. no external pressure.
Question 2
1 / -0

$$5 g$$ of water rises in the bore of capillary tube when it is dipped in water. If the radius of bore capillary tube is doubled, the mass of water that rises in the capillary tube above the outside water level is

A
$$1.5 g$$

B
$$10 g$$

C
$$5 g$$

D
$$15 g$$

Solution
Question 3
1 / -0

The height of water in a capillary tube of radius $$2 cm$$ is $$4 cm$$. What should be the radius of capillary, if the water rises to $$8 cm$$ in tube?

A
$$1 cm$$

B
$$0.1 cm$$

C
$$2 cm$$

D
$$4 cm$$

Solution

It is to be remembered that
height of a capillary rise $$\propto \dfrac { 1 }{ radius\quad of\quad capillary } $$
hence,
$$\dfrac { { h }_{ 1 } }{ { h }_{ 2 } } =\dfrac { { r }_{ 2} }{ { r }_{ 1 } } $$
$$\dfrac { 4 }{ 8 } =\dfrac { { r }_{ 2 } }{ 2 } \Rightarrow \boxed { { r }_{ 2 }=1cm } $$
Question 4
1 / -0

The angle of contact between a glass capillary tube of length $$10 cm$$ and a liquid is $$90^o$$. If the capillary tube is dipped vertically in the liquid, then the liquid

A
Will rise in the tube

B
Will get depressed in the tube

C
Will rise up to $$10 cm$$ in the tube and will over flow

D
Will neither rise nor fall in the tube

Solution

The right $$\left( { 90 }^{ 0 } \right) $$ angle of contact implies that cohesion force & adhesive forces are equal in magnitude. Hence we will observe no capillary rise in this case.
Question 5
1 / -0

In a capillary tube, fall of liquid is possible when angle of contact is

A
Acute angle

B
Right angle

C
Obtuse angle

D
None of these

Solution

If angle of contact is acute, liquid rises in a capillary tube whereas if angle of contact is obtuse, liquid falls in a capillary tube.
Therefore, fall of liquid is possible when angle of contact is obtuse.
Question 6
1 / -0

The pressure just below the meniscus of water

A
Is greater than just above it

B
Is less than just above it

C
Is same as just above it

D
Is always equal to atmospheric pressure

Solution

The pressure just below the meniscus of water is less than just above it due to surface tension and cohesive forces acting on the water surface.
Question 7
1 / -0

The surface of water in contact with glass wall is

A
Plane

B
concave

C
convex

D
Both b and c

Solution

When we observe capillary action then angle of water with glass will be acute angle i.e. we will observe a concave meniscus.
Question 8
1 / -0

If the surface of a liquid is plane, then the angle of contact of the liquid with the walls of container is

A
Acute angle

B
Obtuse angle

C
$$90^o$$

D
$$0^o$$

Solution

The angle of contact with wall of container is angle b/w liquid surface & normal to the wall of container. Hence for a plane liquid angle of contact is $${ 0 }^{ 0 }$$.
Question 9
1 / -0

A capillary tube when immersed vertically in a liquid records a rise of $$3 cm$$. if the tube is immersed in the liquid at an angle of $$60^o$$ with the vertical, then length of the liquid column along the tube will be:

A
$$2 cm$$

B
$$3 cm$$

C
$$6 cm$$

D
$$9 cm$$

Solution

So $$lcos{ 60 }^{ 0 }=3cm$$
$$l=2\times 3cm=6cm$$
Question 10
1 / -0

In a capillary tube, fall of liquid is possible when angle of contact is

A
Acute angle

B
Right angle

C
Obtuse angle

D
None of these

Solution

Fall of liquid in capillary tube is possible only when cohesive forces are stronger than adhesive force which gives an obtuse angle of contact.

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Mechanical Properties of Fluids Test - 37

Result

Mechanical Properties of Fluids Test - 37

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SHARING IS CARING

Question 1

$$0.1 m$$

$$9.8 m$$

$$0.98 m$$

Full length of capillary tube

Solution

Question 2

$$1.5 g$$

$$10 g$$

$$5 g$$

$$15 g$$

Solution

Question 3

$$1 cm$$

$$0.1 cm$$

$$2 cm$$

$$4 cm$$

Solution

Question 4

Will rise in the tube

Will get depressed in the tube

Will rise up to $$10 cm$$ in the tube and will over flow

Will neither rise nor fall in the tube

Solution

Question 5

Acute angle

Right angle

Obtuse angle

None of these

Solution

Question 6

Is greater than just above it

Is less than just above it

Is same as just above it

Is always equal to atmospheric pressure

Solution

Question 7

Plane

concave

convex

Both b and c

Solution

Question 8

Acute angle

Obtuse angle

$$90^o$$

$$0^o$$

Solution

Question 9

$$2 cm$$

$$3 cm$$

$$6 cm$$

$$9 cm$$

Solution

Question 10

Acute angle

Right angle

Obtuse angle

None of these

Solution

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