Forces and Matter – Online MCQs Test – Physics 9th

1. The length of spring increases as the force increases. This increase in length of spring is known as:

elasticity

expansion

extension

stretch

2. Pressure is greater when a large force acts on:

small area

large area

round area

cylindrical area

3. 1 Pascal (Pa) = :

1.013 × 10⁵ Nm^-2

1Nm^-2

1.013 Nm^-2

10 Nm^-2

4. The machines in which force is transmitted by liquids under pressure is known as:

fluid machines

liquid machines

hydraulic machine

pneumatic machines

5. In SI system, unit of pressure is:

Nm^-1

Nm^-2

Nm²

6. The spring in brakes and clutches are used:

to restore original position

to absorb strain energy

to absorb shocks

to measure force

7. If the material recovers the original dimension, when an external force is removed, this deformation is known as deformation.

inelastic

Irreversible

elastic

permanent

8. The pressure exerted by fluids acts in:

two directions

up & down directions

all directions

one direction

9. What is the unit for the spring constant?

Nm^-2

Nm²

Nm^-1

10. It is a collection of molecules that are randomly arranged and held together by weak cohesive forces and by forces exerted by the walls of a container.

A liquid

None of them

A gas

A liquid and A gas

11. Pressure = :

area / force

area / torque

torque / area

force / area

12. Pressure of a fluid P is proportional to the:

None of them

mass

depth

force

13. A hydraulic machine works on:

Molecular theory

Newton’s third law of motion

Newton’s law of gravitation

Pascal’s law

14. The pressure in a fluid is greater with:

small depth and low density

large depth and high density

the small depth and high density

large depth and low density

15. It tells us how tightly matter is packed together.

Mass

Volume

Density

Weight

16. If a metal block applies a force of 20N on an area of 5cm². Find the pressure being applied by the block on the area of ____________

100 Ncm^-2

4 Ncm^-2

0.25 Ncm^-2

0.8 Ncm^-2

17. 1 atmosphere = :

1.013 × 10⁵ Pascal

1.013 × 10⁵ Bar

1.013 × 10⁵ Nm^-1

1.013 × 10⁵ Newton

18. The given figure shows a container with three spouts. The container is filled with water. Jets of water pour out of the spouts. Why does the jet of water from the bottom spout go farthest out from the container?

Pressure decreases with depth

More water available to flow out the bottom

Density of water is different at different place

Pressure increases with depth

19. When a force is exerted on an area, this is known as:

torque

energy

pressure

equilibrium

20. The equation for Hooke’s law may by written as:

F = k/x

x = kF

x = k/F

F = kx

Class 9th | Physics | Chapter 5 | Forces and Matter | Online MCQs Test