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All questions of Surface Tension for UPSC CSE Exam
The unit of surface tension is:
- a)Newton per cubic meter (N/m^3)
- b)Newton per meter (N/m)
- c)Newton per square meter (N/m^2)
- d)Pascal (Pa)
Correct answer is option 'B'. Can you explain this answer?
The unit of surface tension is:
a)
Newton per cubic meter (N/m^3)
b)
Newton per meter (N/m)
c)
Newton per square meter (N/m^2)
d)
Pascal (Pa)
|
Keshav answered |
Since surface tension is force per unit length, its unit will be unit of force / unit of length = Newton / meter Unit of force is newton and the unit of length is meter. So, unit of surface tension is Newton/meter
The angle of contact between a liquid and a solid surface is 180°. This indicates:- a)Complete wetting of the solid by the liquid
- b)No wetting of the solid by the liquid
- c)Partial wetting of the solid by the liquid
- d)None of the above
Correct answer is option 'B'. Can you explain this answer?
The angle of contact between a liquid and a solid surface is 180°. This indicates:
a)
Complete wetting of the solid by the liquid
b)
No wetting of the solid by the liquid
c)
Partial wetting of the solid by the liquid
d)
None of the above
|
Catalyst Learningacademy answered |
An angle of contact of 180° indicates no wetting of the solid by the liquid. The liquid does not spread on the solid surface.
Which of the following factors does not affect the viscosity of a liquid?- a)Temperature
- b)Pressure
- c)Molecular size of the liquid
- d)Color of the liquid
Correct answer is option 'D'. Can you explain this answer?
Which of the following factors does not affect the viscosity of a liquid?
a)
Temperature
b)
Pressure
c)
Molecular size of the liquid
d)
Color of the liquid
|
Paradigm Institute answered |
The viscosity of a liquid can be affected by temperature, pressure, and molecular size, but color of the liquid has no impact on the viscosity of a liquid
Which property of a liquid is responsible for the formation of soap bubbles?- a)Cohesion
- b)Adhesion
- c)Surface tension
- d)Viscosity
Correct answer is option 'C'. Can you explain this answer?
Which property of a liquid is responsible for the formation of soap bubbles?
a)
Cohesion
b)
Adhesion
c)
Surface tension
d)
Viscosity
|
KS Coaching Center answered |
The formation of soap bubbles is due to surface tension. The soap solution lowers the surface tension, allowing the thin films of liquid to form bubbles.
The capillary rise in a narrow tube is due to:- a)Gravity
- b)Surface tension
- c)Adhesion
- d)Viscosity
Correct answer is option 'B'. Can you explain this answer?
The capillary rise in a narrow tube is due to:
a)
Gravity
b)
Surface tension
c)
Adhesion
d)
Viscosity
|
|
KS Coaching Center answered |
Capillary rise in a narrow tube is due to surface tension. The adhesive forces between the liquid and the tube's walls pull the liquid upward.
The phenomenon of capillarity is used in the functioning of:- a)Plants
- b)Animals
- c)Machines
- d)All of the above
Correct answer is option 'D'. Can you explain this answer?
The phenomenon of capillarity is used in the functioning of:
a)
Plants
b)
Animals
c)
Machines
d)
All of the above
|
T.S Academy answered |
Capillarity is used in various natural and mechanical systems. In plants, it helps in the movement of water through capillary tubes. In animals, it aids in the functioning of capillary networks. Machines can utilize capillary action for liquid transfer and other applications.
The property of a liquid that resists its flow is called:- a)Surface tension
- b)Viscosity
- c)Adhesion
- d)Cohesion
Correct answer is option 'B'. Can you explain this answer?
The property of a liquid that resists its flow is called:
a)
Surface tension
b)
Viscosity
c)
Adhesion
d)
Cohesion
|
Ias Masters answered |
Viscosity is the property of a liquid that resists its flow. It is related to the internal friction between molecules within the liquid.
Which of the following statements about surfactants is true?- a)Surfactants increase surface tension
- b)Surfactants decrease surface tension
- c)Surfactants have no effect on surface tension
- d)Surfactants increase viscosity
Correct answer is option 'B'. Can you explain this answer?
Which of the following statements about surfactants is true?
a)
Surfactants increase surface tension
b)
Surfactants decrease surface tension
c)
Surfactants have no effect on surface tension
d)
Surfactants increase viscosity
|
|
Paradigm Institute answered |
Surfactants are substances that lower the surface tension of a liquid. They disrupt the cohesive forces between liquid molecules, reducing surface tension.
What is surface tension?- a)The force that acts perpendicular to the surface of a liquid
- b)The force that acts parallel to the surface of a liquid
- c)The force that acts inside a liquid
- d)The force that acts outside a liquid
Correct answer is option 'A'. Can you explain this answer?
What is surface tension?
a)
The force that acts perpendicular to the surface of a liquid
b)
The force that acts parallel to the surface of a liquid
c)
The force that acts inside a liquid
d)
The force that acts outside a liquid
|
|
Paradigm Institute answered |
Surface tension is the force that acts perpendicular to the surface of a liquid, creating a "skin-like" effect.
Which of the following factors affects surface tension?- a)Temperature
- b)Pressure
- c)Impurities in the liquid
- d)All of the above
Correct answer is option 'D'. Can you explain this answer?
Which of the following factors affects surface tension?
a)
Temperature
b)
Pressure
c)
Impurities in the liquid
d)
All of the above
|
|
Catalyst Learningacademy answered |
Surface tension is affected by temperature, pressure, and impurities in the liquid. These factors can alter the strength of the cohesive forces between liquid molecules.
Which of the following liquids has the highest viscosity?- a)Water
- b)Honey
- c)Alcohol
- d)Gasoline
Correct answer is option 'B'. Can you explain this answer?
Which of the following liquids has the highest viscosity?
a)
Water
b)
Honey
c)
Alcohol
d)
Gasoline
|
Capstone Ias Learning answered |
Honey has a higher viscosity compared to water, alcohol, and gasoline. It flows more slowly due to the stronger cohesive forces between its molecules.
The phenomenon of capillary action is due to:- a)Surface tension
- b)Viscosity
- c)Adhesion
- d)Cohesion
Correct answer is option 'A'. Can you explain this answer?
The phenomenon of capillary action is due to:
a)
Surface tension
b)
Viscosity
c)
Adhesion
d)
Cohesion
|
|
KS Coaching Center answered |
Capillary action is a phenomenon due to surface tension. The adhesive forces between the liquid and the capillary walls, along with cohesive forces within the liquid, cause it to rise or fall in the tube.
The contact angle between a liquid and a solid surface is minimum when:- a)There is no adhesion between the liquid and the solid
- b)There is complete wetting of the solid by the liquid
- c)The liquid spreads out completely on the solid surface
- d)None of the above
Correct answer is option 'B'. Can you explain this answer?
The contact angle between a liquid and a solid surface is minimum when:
a)
There is no adhesion between the liquid and the solid
b)
There is complete wetting of the solid by the liquid
c)
The liquid spreads out completely on the solid surface
d)
None of the above
|
|
Catalyst Learningacademy answered |
The contact angle between a liquid and a solid surface is minimum when there is complete wetting of the solid by the liquid. Adhesion dominates over cohesion.
The rise or fall of liquid in a capillary tube is inversely proportional to the:- a)Surface tension of the liquid
- b)Radius of the capillary tube
- c)Density of the liquid
- d)Viscosity of the liquid
Correct answer is option 'B'. Can you explain this answer?
The rise or fall of liquid in a capillary tube is inversely proportional to the:
a)
Surface tension of the liquid
b)
Radius of the capillary tube
c)
Density of the liquid
d)
Viscosity of the liquid
|
|
Paradigm Institute answered |
The rise or fall of liquid in a capillary tube is inversely proportional to the radius of the tube.A smaller radius results in a higher capillary rise, as the surface tension dominates over gravity.
Which of the following phenomena is explained by surface tension?- a)Formation of raindrops
- b)Floating of a needle on water
- c)Rise of oil in a lamp wick
- d)All of the above
Correct answer is option 'D'. Can you explain this answer?
Which of the following phenomena is explained by surface tension?
a)
Formation of raindrops
b)
Floating of a needle on water
c)
Rise of oil in a lamp wick
d)
All of the above
|
|
KS Coaching Center answered |
Surface tension explains the formation of raindrops (coalescence of water droplets), floating of a needle on water (surface tension supports the needle), and the rise of oil in a lamp wick (capillary action).
The shape of a liquid droplet is determined by:
- a)Surface tension
- b)Viscosity
- c)Bulk Modulus
- d)All of the above
Correct answer is option 'A'. Can you explain this answer?
The shape of a liquid droplet is determined by:
a)
Surface tension
b)
Viscosity
c)
Bulk Modulus
d)
All of the above
|
|
Paradigm Institute answered |
The shape of a liquid droplet is determined by surface tension, cohesion (attraction between liquid molecules), and adhesion (attraction between liquid and solid surfaces).
Which of the following statements about intermolecular forces is true?- a)Strong intermolecular forces result in low surface tension
- b)Strong intermolecular forces result in high surface tension
- c)Intermolecular forces have no effect on surface tension
- d)Intermolecular forces are unrelated to surface tension
Correct answer is option 'B'. Can you explain this answer?
Which of the following statements about intermolecular forces is true?
a)
Strong intermolecular forces result in low surface tension
b)
Strong intermolecular forces result in high surface tension
c)
Intermolecular forces have no effect on surface tension
d)
Intermolecular forces are unrelated to surface tension
|
EduRev UPSC answered |
Stronger intermolecular forces, such as hydrogen bonding, result in higher surface tension because the cohesive forces between molecules are stronger.
The surface tension of a liquid:- a)Decreases with an increase in temperature
- b)Increases with an increase in temperature
- c)Remains constant with temperature
- d)Depends on the type of liquid
Correct answer is option 'A'. Can you explain this answer?
The surface tension of a liquid:
a)
Decreases with an increase in temperature
b)
Increases with an increase in temperature
c)
Remains constant with temperature
d)
Depends on the type of liquid
|
|
Catalyst Learningacademy answered |
Surface tension generally decreases with an increase in temperature. The increased kinetic energy of the molecules weakens the cohesive forces, reducing surface tension.
Which of the following liquids has the highest surface tension?- a)Water
- b)Alcohol
- c)Mercury
- d)Oil
Correct answer is option 'C'. Can you explain this answer?
Which of the following liquids has the highest surface tension?
a)
Water
b)
Alcohol
c)
Mercury
d)
Oil
|
|
Paradigm Institute answered |
Mercury has the highest surface tension among the given options. Its cohesive forces are strong, resulting in a high resistance to deformation.
Surface tension is caused by:
- a)Gravity
- b)Friction
- c)Electrostatic forces between the molecules of a liquid
- d)Cohesive forces between the molecules of a liquid
Correct answer is option 'D'. Can you explain this answer?
Surface tension is caused by:
a)
Gravity
b)
Friction
c)
Electrostatic forces between the molecules of a liquid
d)
Cohesive forces between the molecules of a liquid
|
|
KS Coaching Center answered |
Surface tension is caused by cohesive forces between the molecules of a liquid, which attract each other and create a tension at the surface.
Chapter doubts & questions for Surface Tension - Lucent for GK 2025 is part of UPSC CSE exam preparation. The chapters have been prepared according to the UPSC CSE exam syllabus. The Chapter doubts & questions, notes, tests & MCQs are made for UPSC CSE 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests here.
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