Question

Thrust exerted by an iron cuboid when placed on sand is equal to:

• A. the mass of the cuboid.
• B. the mass per unit surface area.
• C. the weight of the cuboid.
• D. the weight per unit surface area.

Answer 1

The correct option is C the weight of the cuboid.

Thrust is defined as the force acting perpendicularly on a surface. Here the weight of the iron cuboid is the force which is acting normal or perpendicular to the surface of the sand.
The weight or thrust acting per unit surface area is nothing but pressure.
Therefore, we can say that, the weight of the iron cuboid will be the thrust exerted by it on sand.