Tag: surface tension

Quizzes (3) Questions (34)

Questions Related to surface tension

Multiple choice intermolecular forces: cohesive and adhesive forces surface tension properties of matter physics

On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because

  1. mercury is a metal

  2. density of mercury is greater than that of water

  3. cohesion of mercury is greater than its adhesion with glass

  4. cohesion of water is greater than its adhesion with glass
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Mercury remains spherical on a glass plate due to greater cohesive force between mercury molecules than adhesive force between mercury and glass plate.

Multiple choice intermolecular forces: cohesive and adhesive forces surface tension properties of matter physics

A capillary tube of radius $0.25\ mm$ is submerged vertically in water so that $25\ mm$ of its length outside water. The radius of curvature of the meniscus will be $(T = 7.5\times 10^{-3} N/m)$.

  1. $0.2\ mm$
  2. $0.4\ mm$
  3. $0.6\ mm$
  4. $0.8\ mm$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

$h= \dfrac{2T}{dgx}$

$h= \dfrac{2\times 7.5 \times {10}^-3} {1000 \times 10 \times d}$
$h=25mm$
$d= 0.6 mm$