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    when the temperature is increased the angle of contact of a liquid

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    Question

    When the temperature increases, the angle of contact of liquid __________.

    A

    decreases

    B

    increases

    C

    remain the same

    D

    None of these

    Medium Open in App Solution Verified by Toppr

    Correct option is A)

    As the temperature increases, the surface tension and cohesive force among liquid molecules weakens, so the angle of contact with solid surface decreases. 

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    स्रोत : www.toppr.com

    [Solved] With increase in temperature, the angle of contact in a liqu

    The correct answer is option 3) i.e. Decreases CONCEPT: Surface tension is the tendency of water molecules to adhere to each other so as to form t

    Home Physics Fluids Surface tension

    Question

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    With increase in temperature, the angle of contact in a liquid:

    First increases and then decreases

    Increases Decreases Remains constant

    Answer (Detailed Solution Below)

    Option 3 : Decreases

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    Detailed Solution

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    The correct answer is option 3) i.e. Decreases

    CONCEPT:

    Surface tension is the tendency of water molecules to adhere to each other so as to form the minimum surface area possible.

    This is a result of cohesion between water molecules.

    ​Consider a solid surface with a liquid placed over it as shown.

    Here θMath input error

    Math input error

    is the contact angle made by the liquid with the solid surface due to surface tension.

    Molecules at the surface of a liquid are partly exposed to the surrounding. The molecules at the liquid-air interface experience fewer interactions and have more energy to escape to the surrounding.

    The stronger the intermolecular interaction of the liquid, the greater is the cohesion.

    ​EXPLANATION:When the temperature of the liquid is increased, the molecular vibration increases, and thus the intermolecular forces weaken. This reduces the surface tension and cohesion.

    When surface tension reduces, the tendency of the liquid to form minimum surface area reduces. This means the liquid tends to spread over the surface.

    Thus, the contact angle decreases.

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    Q1. A capillary tube of radius r is immersed in water and water rises in it to a height h. The mass of the water in the capillary is 5g. Another capillary tube of radius 2r is immersed in water. The mass of water that will rise in this tube is :Q2. The diameter of a capillary is 4 mm. If Reynolds's number of the tube is 1000 and the co-efficient of viscosity for the water is 0.02 poise, determine the maximum speed of water for the stream line flow in the tube?Q3. 'Two spherical soap bubbles of radii r1 and r2 coalesce to form a bubble of radius R. If the surface tension of soap solution is T, atmospheric pressure is P, the change in volume of the air enclosed is V and the change in surface area is 'A'. Complete the expression using above statement, 3PV + ___ = 0Q4. Two capillaries whose diameters are respectively 9.0 mm and 8.0 mm, stand one by one in water. If water rises to a height 4.5 mm in the first capillary, what will be the height of water in the second capillary? (choose an approximate value)Q5. What is the height of the fluid raise (h), when the capillary with the diameter (d) is dipped in the fluid having a density (

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    स्रोत : testbook.com

    When the temperature increased the angle of contact of a liquid

    Cohesive force decreases so angle of contact decreases.

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    When the temperature increased...

    When the temperature increased the angle of contact of a liquid

    Updated On: 27-06-2022

    ( 00 : 20 ) ADVERTISEMENT Text Solution Open Answer in App A increses B decreases C remains the same D

    first increases and then decreases

    Answer

    The correct Answer is B

    Solution

    Cohesive force decreases so angle of contact decreases.

    Answer

    Step by step solution by experts to help you in doubt clearance & scoring excellent marks in exams.

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