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Surface tension is the property of a liq...

Surface tension is the property of a liquid by virtue of which the free space of the liquid at rest tends to have minimum area and as such it behaves as if covered with a stretched membrane. It is measured as the force acting an unit length of a line imagined to be drawn tangentially anywhere on the free surface of liquid at rest. It acts at right angles to this line on both sides and along the tangent to the liquid surface.
Raindrops are spherical in shape because each drop tends to acquire maximum surface area :
(a) True (b) False

Text Solution

Verified by Experts

The correct Answer is:
b
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Surface tension is the property of a liquid by virtue of which the free space of the liquid at rest tends to have minimum area and as such it behaves as if covered with a stretched membrane. It is measured as the force acting an unit length of a line imagined to be drawn tangentially anywhere on the free surface of liquid at rest. It acts at right angles to this line on both sides and along the tangent to the liquid surface. Surface tension is a scalar quantity : (a) True (b) False

Surface tension is the property of a liquid by virtue of which the free space of the liquid at rest tends to have minimum area and as such it behaves as if covered with a stretched membrane. It is measured as the force acting an unit length of a line imagined to be drawn tangentially anywhere on the free surface of liquid at rest. It acts at right angles to this line on both sides and along the tangent to the liquid surface. The iron needle will floats on clean water but sink when some detergent is added to this water (a) True (b) False

Knowledge Check

  • Viscosity is the property of liquids by virtue of which they :

    A
    oppose the relative motion of its parts.
    B
    push neighbouring molecules
    C
    attract other molecules
    D
    become conducting

  • Viscosity is the property by virtue of which a liquid.

    A
    occupies minimum surface area
    B
    offers resistance for the relative motion between its layers.
    C
    becomes spherical in shape.
    D
    tends to gain its deformed position.

  • Surface tension in a liquid is due to :

    A
    Adhesive force between molecules
    B
    Cohesive force between molecules
    C
    Gravitational force between molecules
    D
    Electrical force between molecules.

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    Surface tension is the property of a liquid by virtue of which the free space of the liquid at rest tends to have minimum area and as such it behaves as if covered with a stretched membrane. It is measured as the force acting an unit length of a line imagined to be drawn tangentially anywhere on the free surface of liquid at rest. It acts at right angles to this line on both sides and along the tangent to the liquid surface. When a razor bladed floats on water, then the force of surface tension acts on the circumference of the blade acting tangentially to the liquid surface : (a) True (b) False

    Surface tension is the property of a liquid by virtue of which free surface of liquid at rest tries to have minimum surface area. In doing so, the free surface of liquid at rest behaves as if it is covered with a stretched membrane. Surface tension (S) of a liquid is measured by from (F) acting on unit length fo a line (l) imagined to be drawn tangentially anywhere on the free surface i.e., S = (F)/(l). S is measured in N m^(-1) Read the above passage and answer the following question : (i)What is the cause of surface tension ? (ii) A wire ring of 30 mm diameter resting flat on the surface of a liquid is raised. The pull required is 1.5 gf more before the film breaks then it is after. What is surface tension of the liquid ? (iii) What are the implication of this phenomenon in day to day life ?

    ...........is the property by virtue of which the free surface of the liquid at rest behaves like a stretched elastic membrane tending to contract to occupy minimum surface area.

    why does the free surface of a liquid at rest behave like a stretched elastic membrane?

    Why does a liquid surface behave like a stretched membrane ?

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