H C Verma Solutions for Chapter: Some Mechanical Properties of Matter, Exercise 1: QUESTIONS FOR SHORT ANSWER

A uniform vertical tube of circular cross-section contains a liquid. The contact angle is $90°$. Consider that a diameter of the tube is lying in the surface of the liquid. The surface to the right of this diameter pulls the surface on the left of it. What keeps the surface on the left in the equilibrium?

When a glass capillary tube is dipped at one end in water, the water rises in the tube. The gravitational potential energy is thus increased. Is it a violation of conservation of energy?

If a mosquito is dipped into water and released, it is not able to fly until it is dry again. Explain.

The force of surface tension acts tangentially to the surface, whereas the force due to air pressure acts perpendicularly on the surface. Then how is the force due to excess pressure inside a bubble is balanced by the force due to the surface tension?

When the size of soap bubble is increased by pushing more air in it, the surface area increases. Does it mean that the average separation between the surface molecules is increased?

The frictional force between solids operates even when they do not move with respect to each other. Do we have a viscous force acting between the two layers even if there is no relative motion?

Water near the bed of a deep river is quiet while that near the surface flows. Give reasons.

If the water in a flask and castor oil in other is violently shaken and kept on a table, which will come to rest earlier?