Mechanical Properties of Fluids Test

Result

Mechanical Properties of Fluids Test - 51

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Question 1
4 / -1

A thin liquid film formed between a U - shaped wire and a light slider supports a weight of 1.5 × 10² N(See figure). The length of the slider is 30 cm and its weight negligible. The surface tension of the liquid film is

A
0.0125 Nm^–1

B
0.1 Nm^–1

C
0.05 Nm^–1

D
0.025 Nm^–1

Solution
Question 2
4 / -1

Energy needed in breaking a drop of radius R into n drops of radii r is given by

A
4πT (nr² – R²)

B

C
4πT (R² – nr²)

D
4πT (nr² + R²)

Solution
Question 3
4 / -1

The potential energy of a molecule increases when it is brought to the surface from the interior of a liquid because

A
At the free liquid surface gravitational potential energy is more

B
Work has to be done to move a molecule to the surface against the repulsive component of the inter molecular forces

C
Work has to be done to move a molecule to the surface against the attraction from other molecules

D
The temperature of the liquid surface is always more than that of the interior of the liquid
Question 4
4 / -1

Work done is splitting a drop of water of 1 mm radius into 10⁶ droplets is (Surface tension of water = 72 × 10^–3 J/m²)

A
9.58 × 10^–5 J

B
8.95 × 10^–5 J

C
5.89 × 10^–5 J

D
5.98 × 10^–6 J

Solution
Question 5
4 / -1

The amount of work done in blowing a soap bubble such that its diameter increases from d to D is (T = Surface tension of the solution)

A
4π (D² – d²)T

B
8π (D² – d²)T

C
π (D² – d²)T

D
2π (D² – d²)T

Solution
Question 6
4 / -1

If work W is done in blowing a bubble of radius R from a soap solution, then the work done in blowing a bubble of radius 2R from the same solution is

A
W/2

B
2W

C
4W

D

Solution
Question 7
4 / -1

If two identical mercury drops are combined to form a single drop, then its temperature will

A
Decrease

B
Increase

C
Remain the same

D
None of these
Question 8
4 / -1

The surface tension of a liquid at its boiling point

A
Becomes zero

B
Becomes infinity

C
Is equal to the value at room temperature

D
Is half to the value at the room temperature
Question 9
4 / -1

A film of water is formed between two straight parallel wires of length 10 cm each separated by 0.5 cm. If their separation is increased by 1 cm while still maintaining their parallelism, how much work will have to be done? (Surface tension of water = 7.2 × 10^–2 N/m)

A
7.22 × 10^–6 J

B
1.44 × 10^–5 J

C
2.88 × 10^–5 J

D
5.76 × 10^–5 J

Solution
Question 10
4 / -1

A
75.36 × 10^–4 J

B
37.68 × 10^–4 J

C
150.72 × 10^–4 J

D
75.36 J

Solution