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Following are general statements about water drops. (a) Surface tension is responsible for the spherical shape of the water drops. (b) Even in the absence of gravitation, water drops have a spherical shape. (c) Formation of water drops occurs, if the mass of the water is stretched. Which of the above statement/statements is/are correct?

Following are general statements about water drops. (a) Surface tension is responsible for the spherical shape of the water drops. (b) Even in the absence of gravitation, water drops have a spherical shape. (c) Formation of water drops occurs, if the mass of the water is stretched. Which of the above statement/statements is/are correct? Correct Answer (a), (b) and (c)

The correct answer (a), (b), and (c)

Key Points

  • The spherical nature of water and oil drops is due to the phenomena of surface tension. Hence a is correct.
  • Surface Tension:
    • Surface Tension: It is defined as force per unit length in the plane of the liquid surface at right angles to either side of an imaginary line drawn to the surface.
      • The SI Unit of surface tension is N/m.
      • Surface Tension is due to cohesive molecular forces.
        • Cohesive forces: Attractive forces between molecules of the same types are called cohesive forces.
  • Surface tension is responsible for the shape of liquid droplets. Although easily deformed, droplets of water tend to be pulled into a spherical shape by the cohesive forces of the surface layer. 
  • In the absence of other forces, including gravity, drops of virtually all liquids would be approximately spherical. Hence b is correct
  • The formation of drops occurs when a mass of liquid is stretched. Hence c is correct

Related Questions

From an alloy, two specimens are machined and tested separately under tension and compression. The engineering stress-strain curves as well as the true stress-true strain curves for tension and compression are plotted in the same diagram. Identify the correct statements:
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Q. The true stress-true strain curve in compression is lower than the true stresstrue strain curve in tension due to Bauschinger effect.
R. The true stress-true strain curve in tension is above the corresponding engineering stress-strain, curve.
S. The true stress-true strain curve in tension and compression are identical.
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