Section A Very Short type Questions - Answers

🧪 (B) Very Short Answer Type Questions – Click to Reveal

1. Define the term thrust. State its S.I. unit.

Thrust is the total force acting normally on a surface. S.I. unit: newton (N).

2. (a) What physical quantity is measured in bar?
(b) How is bar related to pascal?

(a) Pressure
(b) 1 bar = 100,000 pascal (Pa)

3. Define one pascal (Pa), the S.I. unit of pressure.

1 Pa is the pressure exerted when a force of 1 newton acts on an area of 1 square metre.

4. Is thrust a scalar or a vector?

Thrust is a vector quantity.

5. Is pressure a scalar or a vector?

Pressure is a scalar quantity.

6. What is a fluid?

A fluid is a substance that can flow, such as a liquid or gas.

7. Pressure at the free surface of a water lake is P₁, and at depth h it is P₂:
(a) How are P₁ and P₂ related?
(b) Which is more, P₁ or P₂?

(a) P₂ = P₁ + hρg
(b) P₂ is more than P₁

8. How does the liquid pressure on a diver change if:
(i) the diver moves deeper
(ii) the diver moves horizontally?

(i) Pressure increases with depth
(ii) Pressure remains the same at the same depth

9. State Pascal's Law of transmission of pressure.

Pressure applied at any point in a confined fluid is transmitted equally in all directions.

10. Name two applications of Pascal’s Law.

Hydraulic press and hydraulic brakes.

11. Complete the sentences:
(a) Pressure at a depth h in a liquid of density ρ is...
(b) Pressure is ______ in all directions about a point in a liquid.
(c) Pressure at all points at the same depth is...
(d) Pressure at a point inside a liquid is ______ to its depth.
(e) Pressure at a given depth is ______ to the density of liquid.

(a) P = hρg
(b) Same
(c) Equal
(d) Directly Proportional
(e) Directly Proportional