Mechanical Properties of Fluids Test

Result

Mechanical Properties of Fluids Test - 70

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Question 1
4 / -1

A soap bubble of radius R is blown. After heating the solution a second bubble of radius 2R is blown. The work required to blow the second bubble in comparison to that required for the first bubble is

A
Double

B
Slightly less than double

C
Slightly less than four times

D
Slightly more than four times

Solution
Question 2
4 / -1

Soap helps in cleaning clothes, because

A
Chemicals of soap change

B
It increases the surface tension of the solution

C
It absorbs the dirt

D
It lowers the surface tension of the solution
Question 3
4 / -1

A wooden stick 2 m long is floating on the surface of water. The surface tension of water 0.07 N/m. By putting soap solution on one side of the sticks the surface tension is reduced to 0.06 N/m. The net force on the stick will be

A
0.07 N

B
0.06 N

C
0.01 N

D
0.02 N

Solution
Question 4
4 / -1

The property utilized in the manufacture of lead shots is

A
Specific weight of liquid lead

B
Specific gravity of liquid lead

C
Compressibility of liquid lead

D
Surface tension of liquid lead
Question 5
4 / -1

A square frame of side L is dipped in a liquid. On taking out, a membrane is formed. If the surface tension of the liquid is T, the force acting on the frame will be

A
2 TL

B
4 TL

C
8 TL

D
10 TL

Solution
Question 6
4 / -1

Water does not wet an oily glass because

A
Cohesive force of oil > adhesive force between oil and glass

B
Cohesive force of oil > cohesive force of water

C
Oil repels water

D
Cohesive force for water > adhesive force between water and oil molecules
Question 7
4 / -1

A water drop takes the shape of a sphere in a oil while the oil drop spreads in water, because
(A.E = adhesive force C.F. = cohesive force)

A
C.F. for water > A.F. for water and oil

B
C.F. for oil > A.F. for water and oil

C
C.F. for oil < A.F. for water and oil

D
None of the above
Question 8
4 / -1

In the glass capillary tube, the shape of the surface of the liquid depends upon

A
Only on the cohesive force of liquid molecules

B
Only on the adhesive force between the molecules of glass and liquid

C
Only on relative cohesive and adhesive force between the atoms

D
Neither on cohesive nor on adhesive force
Question 9
4 / -1

The force required to separate two glass plates of area 10^–2 m² with a film of water 0.05 mm thick between them, is (Surface tension of water is 70 × 10^–3 N/m)

A
28 N

B
14 N

C
50 N

D
38 N

Solution
Question 10
4 / -1

The surface tension of a liquid

A
Increases with area

B
Decreases with area

C
Increases with temperature

D
Decreases with temperature

Solution