Pressure quiz

Concept Recap

Thrust: The total force applied perpendicularly on a surface is called thrust.

Pressure: Pressure is the force acting per unit area. It tells how much force is applied on a small surface.

Formula: Pressure = Thrust / Area

Units:

• SI unit of pressure: pascal (Pa) [1 pascal = 1 newton / 1 m²]
• CGS unit of pressure: dyne/cm²

Relation between units:

• 1 pascal = 10 dyne/cm²

Factors affecting pressure:

• Increase in thrust increases pressure.
• Increase in area decreases pressure.

1. What is the SI unit of pressure?

dyne pascal newton joule

2. What is thrust?

Force acting normally on a surface Force acting sideways Energy Area under force

3. Pressure is __________ per unit area.

energy force momentum density

4. What happens to pressure if the area is increased?

Pressure increases Pressure decreases Pressure remains same Pressure becomes zero

5. What is the CGS unit of pressure?

pascal newton/cm² dyne/cm² joule/cm²

6. If thrust increases and area remains constant, pressure will ________.

increase decrease remain same become zero

7. Which quantity is measured in newton?

Force Pressure Area Time

8. 1 pascal equals how many dyne/cm²?

10 1 100 1000

9. Which of these affects pressure directly?

Thrust Area alone Time Volume

10. Which device measures atmospheric pressure?

Thermometer Speedometer Barometer Hygrometer