The pressure on a surface is reduced by :

1. using high thrust
2. increasing the area of surface
3. decreasing the area of surface
4. none of these

Cutting tools have either sharp or pointed edges so that a …………… thrust may cause a …………… pressure at that edges and cutting can be done with less effort.

1. high, high
2. small, small
3. high, small
4. small, high

Out of the following, which one is correct about the law of liquid pressure ?

1. Pressure is different in all directions about a point inside the liquid.
2. In a stationary liquid, pressure is different at all points on a horizontal plane.
3. Inside the liquid, pressure decreases with an increase in depth from its free surface.
4. It increases with an increase in the density of the liquid.

The pressure P₁ at a certain depth in river water and P₂ at the same depth in sea water are related as:

1. P₁ > P₂
2. P₁ = P₂
3. P₁ < P₂
4. P₁ - P₂ = atmospheric pressure