Science [ 1 mark questions ]

Pascal’s law states that an increase in pressure at any point inside a liquid at rest is transmitted equally and without any change, in all directions to every other point in the liquid.

The pressure exerted by the atmospheric gases on its surroundings and on the surface of the earth is called atmospheric pressure.

Due to the presence of dissolved salts in sea water is denser than river water which makes floating easier and hence swimming is easier.

Helium is much less denser than ordinary air which gives them buoyancy and thus float in air.

Pressure exerted by a liquid at a point is determined by,

•  depth (h)
•  density of the liquid (p)
•  acceleration due to gravity (g).

In milk processing units and Dairies.

Hydraulic systems are known as-force multipliers.

Psi = Pascal per inch.

Air pressure at sea level is referred to as atmospheric pressure.

P = hg ; P – Pressure, h- depth, p- density, g – Acceleration due to gravity.

(i) Depth (b) (ii) Density bf Liquid (□) (iii) Acceleration due to gravity (g).

Newton per squaremeter (Nm-2).

It is easy to compress a Gas. The liquid is Incompressible.