Mechanical Prop...

A liquid is allowed to flow in a tube of truncated cone shape. Identify correct statement from the following.

The gauge pressure of $$3 \times 10^5$$ N/m$$^2$$ must be maintained in the main water pipes of a city. How much work must be done to pump $$50,000$$ m$$^3$$ of water at a pressure of $$1.0 \times 10^5$$ N/m$$^2$$ -

A student uses a measuring cylinder to measure the volume of some water. The diagram shows
part of the measuring cylinder. The top and bottom of the meniscus are labelled.
What is the volume of the water?

A drop of mercury of radius $$2 mm$$ is split into 8 identical droplets. Find the increase in surface energy. (Surface tension of mercury is $$0.465{ J/m }^{ 2 }$$)

Water does not wet an oily glass, because

The pressure at the bottom of a tank containing a liquid does not depend on

No capillarity will take place if:-
(i) The liquid is at its boiling point
(ii) The liquid is at its freezing point
(iii) The angle of contact is $$0^{\circ}$$
(iv) The angle of contact is $$90^{\circ}$$

Nature of meniscus for liquid of $$0^{0}$$ angle of contact

In order to float a ring of area $$0.04 m^{2}$$ in a liquid of surface tension $$75 N/m$$, the required surface energy will be

A capillary tube, made of glass is dipped into mercury. Then: