Capillary Action

Q.

What is the use of a capillary tube?

Q. There are two holes one each along the opposite sides of a wide rectangular tank. The cross section of each hole is 0.01 m2 and the verticle distance between the holes is one metre. The tank is filled with water. The net force on the tank in Newton when the water flows out of the holes is ( density of water is 1000kg m3)

Q.

In a simple barometer, some air is trapped in the space above the mercury column. Let H be the height of the mercury column initially. When the tube is further pushed into the vessel, what happens to the height of the mercury column ‘H’ in the tube?

1. Increases

2. Decreases

3. Can’t say

4. Remains same

Q.

When a capillary tube is placed in mercury, we see that__

1. the level of mercury falls

2. the level of mercury rises rapidly.

3. the level of mercury first rises then falls

4. the level of mercury rises slowly

Q.

The absorption of ink by blotting paper involves?

Q.

With the increase in temperature, the level of water

1. decreases in a capillary tube.

2. increases rapidly in a capillary tube.

3. first increases and then decreases in a capillary tube.

4. increases slowly in a capillary tube.

Q.

If equal volumes of water and alcohol are heated to the same rise of temperature, then

1. alcohol will expand more than water

2. water will expand more than alcohol

3. alcohol will expand but water will contract

4. both will expand more

Q.

The tendency of a liquid in a tube or absorbent material to rise or fall as a result of surface tension is called

1. Buoyancy

2. None of these

3. Capillary action

4. Viscosity

Q. For which of the two pairs, the angle of contact is same

1. Silver and water; mercury and glass
2. Silver and chromium; water and chromium
3. Pure water and glass; glass and alcohol
4. Water and glass; glass and mercury

Q.

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

1. Increases

2. Decreases

3. First increases and then decreases

4. Remains the same

Q.

On a hill 1000 m high, the atmospheric pressure will be:

1. 76 cm of mercury

2. more than 76 cm of mercury

3. less than 76 cm of mercury

4. none of the above

Q.

In rainy season dampness spreads on a wall, this happens due to

1. upthrust

2. capillary action

3. surface tension

4. All of these

Q.

Statement 1: The viscosity of the liquid increases rapidly with rising of temperature.
Statement 2: Viscosity of a liquid is the property of the liquid by virtue of which it opposes the relative motion amongst its different layers.

1. If the assertion and reason both are false.
2. If both assertion and reason are true and the reason is the correct explanation of the assertion.
3. If both assertion and reason are true but reason is not the correct explanation of the assertion.
4. If assertion is true but reason is false.

Q. Assertion :When height of a tube is less than liquid rise in the capillary tube, the liquid does not overflow. Reason: Product of radius of meniscus and height of liquid in capillary tube always remains constant.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Assertion is incorrect but Reason is correct

Q.

A student performs an experiment using a barometer as shown in the figure below. The atmospheric pressure is given as 76 cm of Hg $\left(h_0\right)$ and the rise in height is 5 cm. What will be the pressure of the gas?

1. 71 cm of Hg

2. 75 cm of Hg

3. 81 cm of Hg

4. 70 cm of Hg

Q. What is capillarity? Give any two application of it.

Q. Explain the phenomenon of capillarity

Q.

Give reasons for the following:

Water has a tendency to form spherical droplets.

Q.

It is relatively easy to write on blotting paper or newspaper with an ink pen because of

1. Because of viscosity

2. Because of inertia

3. Because of friction

4. Because of capillarity

Q. The rise of a liquid in a capillary tube does not depend upon

1. Angle of contact
2. Density of the liquid
3. Radius of the capillary tube
4. Atmospheric pressure

Q.

In the given figure the atmospheric pressure is equal to ρgh. Which of the following is not always correct when the simple barometer is accurately measuring the atmospheric pressure?

1. P_b = P_atm

2. P_b = P_c

3. P_b = 760 mm-Hg

4. P_a is a vacuum

Q. When a capillary tube is immersed in a liquid, then liquid of mass $M$ rises in the capillary tube. If capillary tube of double radius is taken then mass of same liquid rising in the tube is:

1. $\frac{M}{2}$
2. $2M$
3. $\frac{M}{4}$
4. $4M$

Q. Water rises in a capillary tube to a height of $2.0$ cm. In another capillary tube whose radius is one third of it, how much the water will rise?

1. $5cm$
2. $3cm$
3. $6cm$
4. $9cm$

Q. Out of the following, which one is not an example of capillary action?

1. Ploughing of the field
2. Absorption of ink in a blotting paper
3. Floating of wood on the surface of water
4. Rise of oil in the wick of a lamp

Q.

The Melting point of ice:

1. Is proportional to pressure

2. Increases with increasing pressure

3. Decreases with increasing pressure

4. Is independent of pressure

Q. A block of mass $M$ is suspended by a string $A$ from the ceiling and another string $B$ is connected to the bottom of the block. If $B$ is pulled on steadily:

1. $A$ breaks earlier than $B$
2. $B$ breaks earlier than $A$
3. both break simultaneously
4. not possible to say which one will break earlier

Q. One end of a towel dips into a bucket full of water and other end hangs over the bucket. It is found that after some time the towel becomes fully wet. It happens

1. Because viscosity of eater is high
2. Because of the capillary action of cotton threads
3. Because of gravitational force
4. Because of evaporation of water

Q. Water rises to a height of $2cm$ in a capillary tube held vertically. When the tube is tilted ${60}^o$ from the vertical, the length of the water column in the tube will be

1. $1cm$
   
2. $2cm$
   
3. $3cm$
   
4. $4cm$
   

Q.

Water has convex meniscus.

1. True
2. False

Q. Water rises in a vertical capillary tube upto a length of 10 cm. If the tube is inclined at ${45}^0$, the length of water column risen in the tube will be

1. 10 cm
2. $10\sqrt{2}$ cm
3. $5\sqrt{2}$ cm
4. 20 cm