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Test: Surface Tension, Elasticity - UPSC MCQ


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10 Questions MCQ Test Science & Technology for UPSC CSE - Test: Surface Tension, Elasticity

Test: Surface Tension, Elasticity for UPSC 2024 is part of Science & Technology for UPSC CSE preparation. The Test: Surface Tension, Elasticity questions and answers have been prepared according to the UPSC exam syllabus.The Test: Surface Tension, Elasticity MCQs are made for UPSC 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Surface Tension, Elasticity below.
Solutions of Test: Surface Tension, Elasticity questions in English are available as part of our Science & Technology for UPSC CSE for UPSC & Test: Surface Tension, Elasticity solutions in Hindi for Science & Technology for UPSC CSE course. Download more important topics, notes, lectures and mock test series for UPSC Exam by signing up for free. Attempt Test: Surface Tension, Elasticity | 10 questions in 10 minutes | Mock test for UPSC preparation | Free important questions MCQ to study Science & Technology for UPSC CSE for UPSC Exam | Download free PDF with solutions
Test: Surface Tension, Elasticity - Question 1
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Why do liquid drops, such as raindrops and dewdrops, tend to be spherical in shape?

Detailed Solution for Test: Surface Tension, Elasticity - Question 1

Explanation: Liquid drops like raindrops and dewdrops tend to be spherical because a sphere has the smallest surface area for a given volume, which helps minimize surface tension. This reduction in surface tension allows the liquid to achieve the lowest energy state. Therefore, liquid droplets naturally form a spherical shape to minimize surface tension.

Test: Surface Tension, Elasticity - Question 2
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What property of a liquid causes the legs of a pond skater to produce slight depressions on the water's surface?

Detailed Solution for Test: Surface Tension, Elasticity - Question 2
The property of a liquid that causes the legs of a pond skater to produce slight depressions on the water's surface is known as surface tension. Surface tension is the result of molecular attractions within the liquid, which causes the surface to act like an elastic "skin." It allows insects like pond skaters to walk on water and creates a slight depression when an object is placed on the surface.
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Test: Surface Tension, Elasticity - Question 3
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How do soaps and detergents affect the surface tension of water?

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Soaps and detergents lower the surface tension of water. They do this by interfering with the molecular attractions at the surface of the water, reducing the cohesive forces that create surface tension. This decrease in surface tension enhances water's wetting power, making it more effective at detaching dirt particles from clothes and utensils during washing.
Test: Surface Tension, Elasticity - Question 4
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In a capillary tube, if mercury is used instead of water, what happens to the level of mercury inside the tube?
Detailed Solution for Test: Surface Tension, Elasticity - Question 4
When mercury is used in a capillary tube instead of water, the level of mercury inside the tube is lower than the level outside the tube. This is because mercury molecules are less attracted to glass (adhesion) than to each other (cohesion). As a result, the mercury in the tube does not rise as much as water would, and the level inside the tube is lower.
Test: Surface Tension, Elasticity - Question 5
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What causes water to rise in a capillary tube when it is dipped in water?
Detailed Solution for Test: Surface Tension, Elasticity - Question 5
Water rises in a capillary tube when it is dipped in water due to adhesion between water molecules and the glass of the tube. Adhesion is the attractive force between unlike molecules, and in this case, water molecules are more attracted to the glass than to each other. This phenomenon is known as capillarity, and it allows liquids like water to be drawn into narrow tubes or porous materials.
Test: Surface Tension, Elasticity - Question 6
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What property of a material allows it to resume its original form and dimensions when external forces are removed?
Detailed Solution for Test: Surface Tension, Elasticity - Question 6
The property of a material that allows it to resume its original form and dimensions when external forces are removed is called elasticity. Elastic materials can deform when subjected to forces but return to their original shape and size when those forces are no longer applied.
Test: Surface Tension, Elasticity - Question 7
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What is the ratio of stress to strain called in the context of elasticity?
Detailed Solution for Test: Surface Tension, Elasticity - Question 7
The ratio of stress to strain in the context of elasticity is called Young's Modulus. Young's Modulus quantifies how a material responds to an applied stress by measuring the amount of strain it undergoes. It is an important property for understanding a material's elasticity.
Test: Surface Tension, Elasticity - Question 8
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What does Hooke's Law state in the context of material deformation?
Detailed Solution for Test: Surface Tension, Elasticity - Question 8
Hooke's Law states that, provided the elastic limit is not exceeded, the deformation of a material is proportional to the force applied to it. In other words, the amount of deformation a material undergoes is directly proportional to the force applied, as long as the material remains within its elastic limit.
Test: Surface Tension, Elasticity - Question 9
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According to Bernoulli's Principle, what happens to pressure in a fluid when the fluid's speed increases?
Detailed Solution for Test: Surface Tension, Elasticity - Question 9
According to Bernoulli's Principle, when the speed of a fluid (liquid or gas) in a pipe or container increases, the pressure within the fluid decreases. Conversely, when the fluid's speed decreases, the pressure increases. This principle helps explain various fluid dynamics phenomena.
Test: Surface Tension, Elasticity - Question 10
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What is the practical application of Bernoulli's Principle in aviation?
Detailed Solution for Test: Surface Tension, Elasticity - Question 10
The practical application of Bernoulli's Principle in aviation is the generation of lift on an aircraft wing. When air flows over the curved upper surface of an aircraft wing at higher speeds than the air beneath the wing, it creates lower pressure on top and higher pressure underneath, resulting in an upward force (lift) that allows an aircraft to become airborne. Bernoulli's Principle plays a crucial role in the physics of flight.
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