(English Medium) ICSE Class 9 - CISCE Question Bank Solutions

How is the unit bar related to the S.I. unit pascal?

State whether thrust is a scalar or vector?

State whether pressure is a scalar or vector?

Differentiate between thrust and pressure.

How does the pressure exerted by thrust depend on the area of surface on which it acts? Explain with a suitable example.

Why is the tip of an allpin made sharp?

Explain the following statement:
It is easier to cut with a sharp knife than with a blunt one.

Explain the following statement:
Sleepers are laid below the rails.

What is a fluid?

What do you mean by the term fluid pressure?

How does the pressure exerted by a solid and fluid differ?

Describe a simple experiment to demonstrate that a liquid enclosed in a vessel exerts pressure in all directions.

State three factors on which the pressure at a point in a liquid depends.

Write an expression for the pressure at a point inside a liquid. Explain the meaning of the symbols used.

Deduce an expression for the pressure at depth inside a liquid.

Pressure at the free surface of a water lake is P₁, while at a point at depth h below its free surface is P₂. (a) How are P₁ and P₂ related? (b)Which is more P₁ or P₂?

Explain why a gas bubble released at the bottom of a lake grows in size as it rises to the surface of the lake.

A dam has broader walls at the bottom than at the top. Explain.

Why do sea divers need special protective suit?

State the laws of liquid pressure.