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JEE • PHYSICS • MECHANICAL PROPERTIES OF FLUIDS

Mechanical properties of fluids practice · Easy

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Practice format and chapter quiz

These sets use single-correct-answer MCQs. They do not cover every JEE Main or JEE Advanced question format and are not full-length mock papers.

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1 Easy
1 of 19
Application +4 | -1
The excess pressure in a soap bubble is thrice that in other one. Then the ratio of their volume is
View answer and explanation
Correct option: D
1:271: 27
Option A (4vA−4\frac{4 {v}}{{A}-4}) is correct because it is derived from the conservation of momentum, considering the recoil of the daughter nucleus after alpha emission.
2 Easy
2 of 19
Remembering +4 | -1
Shape of liquid drop becomes spherical. It is due to
View answer and explanation
Correct option: D
Surface tension
Option D (Surface tension) is correct because surface tension minimizes the surface area of a liquid, causing it to form a spherical shape.
3 Easy
3 of 19
Understanding +4 | -1
Two droplets merge with each other and forms a large droplet. In this process
View answer and explanation
Correct option: A
Energy is liberated
Option A (Energy is liberated) is correct because when droplets merge, the total surface area decreases, releasing surface energy.
4 Easy
4 of 19
Analyzing +4 | -1
Given below are two statements:

Statement-I: When a capillary tube is dipped into a liquid, the liquid neither rises nor falls in the capillary. The contact angle may be 0∘.0^{\circ}.

Statement-II: The contact angle between a solid and a liquid is a property of the material of the solid and liquid as well.

In the light of above statement, choose the correct answer from the options given below.
View answer and explanation
Correct option: A
Statement-I is false but Statement-II is true
Option A is correct. Statement-I is false because the liquid will rise or fall depending on the contact angle, and Statement-II is true because the contact angle depends on the materials of the solid and liquid.
5 Easy
5 of 19
Remembering +4 | -1
Correct Bernoulli's equation is (symbols have their usual meaning) :
View answer and explanation
Correct option: B
P+ρgh+12ρv2=P+\rho g h+\frac{1}{2} \rho v^2= constant
Option B (P+ρgh+12ρv2=P+\rho g h+\frac{1}{2} \rho v^2= constant) is correct because it represents the correct form of Bernoulli's equation for fluid dynamics.
6 Easy
6 of 19
Understanding +4 | -1
If a soap bubble expands, the pressure inside the bubble:
View answer and explanation
Correct option: B
decreases
Option B (decreases) is correct because as the bubble expands, the radius increases, leading to a decrease in the excess pressure inside.
7 Easy
7 of 19
Understanding +4 | -1
Given below are two statements:

Statement I: If a capillary tube is immersed first in cold water and then in hot water, the height of capillary rise will be smaller in hot water.

Statement II: If a capillary tube is immersed first in cold water and then in hot water, the height of capillary rise will be smaller in cold water.

In the light of the above statements, choose the most appropriate from the options given below
View answer and explanation
Correct option: D
Statement I is true but Statement II is false
Statement I is true and Statement II is false because the height of capillary rise is inversely proportional to the surface tension, which decreases with increasing temperature.
8 Easy
8 of 19
Application +4 | -1
The density of ice is x g cm−3x \mathrm{~g} \mathrm{~cm}^{-3} and that of water is y g cm−3y \mathrm{~g} \mathrm{~cm}^{-3}. When mm gram of ice melts, then the change in volume is
View answer and explanation
Correct option: D
my−mx\frac{m}{y}-\frac{m}{x}
Option D (my−mx\frac{m}{y}-\frac{m}{x}) is correct because the change in volume is the difference between the volume of water and the volume of ice.
9 Easy
9 of 19
Remembering +4 | -1
Bernoulli's equation is based on the principle of
View answer and explanation
Correct option: B
Conservation of energy
Option B (Conservation of energy) is correct because Bernoulli's equation is derived from the principle of conservation of energy in fluid dynamics.
10 Easy
10 of 19
Understanding +4 | -1
Consider the two statements:
Statement-1: A capillary tube is frst dipped in hot water and then dipped in cold water. The rise is higher in hot water.
Statement-2: Capillary tube is first dipped in cold water and then dipped in hot water. The rise is higher in cold water.
View answer and explanation
Correct option: B
Statement-1 is false and statement-2 is true
Statement-2 is true and statement-1 is false because surface tension decreases with increasing temperature, leading to a lower rise in hot water.
11 Easy
11 of 19
Understanding +4 | -1
Due to capillary action, a liquid will rise in a tube. If the angle of contact is
View answer and explanation
Correct option: A
Acute
Option A (Acute) is correct because for a liquid to rise in a tube due to capillary action, the angle of contact must be acute, resulting in a positive cosine value.
12 Easy
12 of 19
Understanding +4 | -1
Coatings used on raincoat are waterproof because they
View answer and explanation
Correct option: A
increases angle of contact
Option A (increases angle of contact) is correct because waterproof coatings increase the angle of contact between the water and the surface, causing the water to bead up and roll off instead of spreading.
13 Easy
13 of 19
Understanding +4 | -1
Given below are two statements:
Statement I: The contact angle between a solid and a liquid is a property of the material of the solid and liquid as well.
Statement II: The rise of a liquid in a capillary tube does not depend on the inner radius of the tube.
In the light of the above statements, choose the correct answer from the options given below:
View answer and explanation
Correct option: C
Statement I is true but Statement II is false
Option C is correct. Statement I is true because the contact angle depends on the solid and liquid materials, and Statement II is false because capillary rise depends on the tube's radius.
14 Easy
14 of 19
Remembering +4 | -1
Pressure inside a soap bubble is greater than the pressure outside by an amount :

(given : R=\mathrm{R}= Radius of bubble, S=\mathrm{S}= Surface tension of bubble)
View answer and explanation
Correct option: A
4SR\frac{4 \mathrm{S}}{\mathrm{R}}
Option A (4SR\frac{4 \mathrm{S}}{\mathrm{R}}) is correct because the pressure inside a soap bubble exceeds the outside pressure by 4SR\frac{4S}{R} due to the two air-liquid interfaces.
15 Easy
15 of 19
Understanding +4 | -1
Small droplets of liquid are usually more spherical in shape than larger drops of the same liquid because
View answer and explanation
Correct option: B
force of surface tension predominates the force of gravity
Option B (force of surface tension predominates the force of gravity) is correct because surface tension effects are more significant for smaller volumes due to the surface area to volume ratio.

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16 Easy
16 of 19
Understanding +4 | -1
Hair of shaving brush cling together when it is removed from water due to
View answer and explanation
Correct option: B
surface tension
Option B (surface tension) is correct because surface tension causes the water film between the hairs to contract, pulling the hairs together.
17 Easy
17 of 19
Understanding +4 | -1
Assertion: Sometimes insects can walk on water.
Reason: The gravitational force on insect is balanced by force due to surface tension.
View answer and explanation
Correct option: A
If both Assertion and Reason are true and Reason is the correct explanation of Assertion
The correct answer is A (If both Assertion and Reason are true and Reason is the correct explanation of Assertion) because the surface tension of water allows insects to walk on it, balancing the gravitational force.
18 Easy
18 of 19
Analyzing +4 | -1
Assertion: Water drops take spherical shape when falling freely.
Reason: Water has minimum surface tension among all liquids.
View answer and explanation
Correct option: D
If both Assertion and Reason are incorrect
Option D is correct. Water drops are actually oval-shaped due to air resistance, and water does not have the minimum surface tension among all liquids.
19 Easy
19 of 19
Understanding +4 | -1
The surface tension of liquid at its boiling point
View answer and explanation
Correct option: A
becomes zero
Option A (becomes zero) is correct because at the boiling point, the intermolecular forces weaken significantly, leading to a surface tension of zero.
Revision notes and key takeaways

Review MECHANICAL PROPERTIES OF FLUIDS in your textbook or class notes, then use this set to check your understanding.

Key Takeaways

  • ✓ This set contains 19 single-correct-answer MCQs on MECHANICAL PROPERTIES OF FLUIDS.
  • ✓ Try each question before opening its answer. Read the explanation where one is available.
  • ✓ Sign in to save submitted answers. Revisit incorrect answers alongside your textbook or class notes.

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