Mechanical Properties of Fluids Test

Result

Mechanical Properties of Fluids Test - 44

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Weekly Quiz Competition

Question 1
4 / -1

Assertion : The bridges are declared unsafe after a long use.
Reason : Elastic strength of bridges decrease with

A
If both assertion and reason are true and reason is the correct explanation of the assertion

B
If both assertion and reason are true but reason is not the correct explanation of the assertion

C
If assertion is true but reason is false.

D
If assertion and reason both are false
Question 2
4 / -1

Assertion : Young's modulus for a perfectly plastic body is zero.
Reason : For a perfectly plastic body is zero.

A
If both assertion and reason are true and reason is the correct explanation of the assertion

B
If both assertion and reason are true but reason is not the correct explanation of the assertion

C
If assertion is true but reason is false

D
If assertion and reason both are false

Solution
Question 3
4 / -1

Assertion : Identical spring of steel and copper are equally stretched more will be done on the steel spring.
Reason : Steel is more elastic than copper.

A
If both assertion and reason are true and reason is the correct explanation of the assertion

B
If both assertion and reason are true but reason is not the correct explanation of the assertion

C
If assertion is true but reason is false

D
If assertion and reason both are false

Solution
Question 4
4 / -1

Which is the dimensional formula for modulus of rigidity ?

A

B

C

D
Question 5
4 / -1

When more than 20 kg mass is tied to the end of wire it breaks what is maximum mass that can be tied to the end of a wire of same material with half the radius ?

A
20 kg

B
5 kg

C
80 kg

D
160 kg

Solution
Question 6
4 / -1

A beaker of radius 15 cm is filled with liquid of surface tension 0.075 N/m. Force across an imaginary diameter on the surface ofliquid is

A
0.075 N

B

C
0.225 N

D
Question 7
4 / -1

A
28 N

B
14 N

C
50 N

D
38 N

Solution
Question 8
4 / -1

A thin liquid film formed between a u-shaped wire and a light slider supports a weight of 1.5 × 10^–2 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 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 its radius.

A
4πr²T

B
2πr²T

C
12πr²T

D
24πr²T

Solution
Question 10
4 / -1

Two small drops mercury, each of radius R, coalesce the form a single large drop. The ratio of the total surface energies before and after the change is.

A

B

C

D

Solution