Mechanical Properties of Fluids Test

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Mechanical Properties of Fluids Test - 71

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Weekly Quiz Competition

Question 1
4 / -1

It is easy to wash clothes in hot water because its

A
Surface tension is more

B
Surface tension is less

C
Consumes less soap

D
None of the above
Question 2
4 / -1

At which of the following temperatures, the value of surface tension of water is minimum?

A
4°C

B
25°C

C
50°C

D
75°C
Question 3
4 / -1

Two pieces of glass plate one upon the other with a little water in between them cannot be separated easily because of

A
Inertia

B
Pressure

C
Surface tension

D
Viscosity
Question 4
4 / -1

Small liquid drops assume spherical shape because

A
Atmospheric pressure exerts a force on a liquid drop

B
Volume of a spherical drop is minimum

C
Gravitational force acts upon the drop

D
Liquid tends to have the minimum surface area due to surface tension
Question 5
4 / -1

Surface tension is an atomic/molecular property of

A
Atoms in the interior

B
Atoms at surface

C
Atoms which are exterior

D
Atoms at surface bounded entirely by different atoms
Question 6
4 / -1

Surface tension of water at 1.2 atmospheric pressure

A
More than 74 dynes/cm

B
Less than 74 dynes/cm

C
Same 74 dynes/cm

D
Cannot say
Question 7
4 / -1

Adding detergents to water helps in removing dirty greasy stains. This is because
1. It increases the oil-water surface tension
2. It decreases the oil-water surface tension
3. It increases the viscosity of the solution
4. Dirty is held suspended surrounded by detergent molecules

A
2 and 4

B
1 only

C
3 and 4

D
4 only
Question 8
4 / -1

Two droplets merge with each other and forms a large droplet. In this process

A
Energy is liberated

B
Energy is absorbed

C
Neither liberated nor absorbed

D
Some mass is converted into energy
Question 9
4 / -1

Radius of a soap bubble is ‘r\', surface tension of soap solution is T. Then without increasing the temperature, how much energy will be needed to double is radius ?

A
4πr² T

B
2πr² T

C
12πr² T

D
24πr²T

Solution
Question 10
4 / -1

A spherical liquid drop of radius R is divided into eight equal droplets. If surface tension is T, then the work done in this process will be

A
2 πR² T

B
3 πP² T

C
4 πR² T

D
2 πRT²

Solution

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Re-Attempt Weekly Quiz Competition

Mechanical Properties of Fluids Test - 71

Result

Mechanical Properties of Fluids Test - 71

Score

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Rank

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SHARING IS CARING

Question 1

Surface tension is more

Surface tension is less

Consumes less soap

None of the above

Question 2

4°C

25°C

50°C

75°C

Question 3

Inertia

Pressure

Surface tension

Viscosity

Question 4

Atmospheric pressure exerts a force on a liquid drop

Volume of a spherical drop is minimum

Gravitational force acts upon the drop

Liquid tends to have the minimum surface area due to surface tension

Question 5

Atoms in the interior

Atoms at surface

Atoms which are exterior

Atoms at surface bounded entirely by different atoms

Question 6

More than 74 dynes/cm

Less than 74 dynes/cm

Same 74 dynes/cm

Cannot say

Question 7

2 and 4

1 only

3 and 4

4 only

Question 8

Energy is liberated

Energy is absorbed

Neither liberated nor absorbed

Some mass is converted into energy

Question 9

4πr2 T

2πr2 T

12πr2 T

24πr2T

Solution

Question 10

2 πR2 T

3 πP2 T

4 πR2 T

2 πRT2

Solution

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4πr² T

2πr² T

12πr² T

24πr²T

2 πR² T

3 πP² T

4 πR² T

2 πRT²