9th Class Physics Chapter 5 Forces and Matter MCQs, PDF Notes & Exercise Questions Answers for Sindh Board

9th Class Physics Chapter 5 Forces and Matter Notes, MCQs, Solved Questions and Answers from Exercise in PDF

If you are searching for Sindh Board Physics Class 9 Solved Exercise MCQs, Numericals, Question Answers and notes then you are on the right page. 

In this blog post, candidates will get the 9th class Physics chapter 5 "Forces and Matter" MCQs solved textbook exercise and PDF notes.

These notes will cover 9th Class Physics Textbook exercise MCQs, Numericals and Question Answers for the Sindh Board.

We have created a separate category under name; "9th Class Physics Notes". In this category, We only shares 9th Class Physics Notes, Class 9 Chapter-wise solved textbook exercise MCQs and Question Answers from textbook exercise.

9th Class Physics Chapter 5 Forces and Matter MCQs with Answers

Here are 9th Class Physics Chapter 5 Forces and Matter MCQs with Answers.

So, the students will be able to study Class 9 Physics Chapter 5 Forces and Matter MCQs with Answers of the Sindh Board Textbook Exercise from this section. 

Not only textbook exercise MCQs but, they will also read the most repeated 9th class Physics MCQs of Chapter 5 "Forces and Matter" from the Board Exam Past Papers.

01. The spring in brakes and clutches are used: 

a) to measure force

b) to absorb shocks

c) to absorb strain energy

d) to restore original position ✓ 

02. Which of the following is not a unit of pressure?

a) Pascal

b) Atmosphere

c) Newton ✓

d) Bar

03. Which of the following deals with the floating and sinking of objects:

(a) Archimedes Principle ✓

(b) Pascal’s Law

(c) Newton’s Law

(d) Ohm's Law

04. If the material returns at the original dimensions, when an external force is removed, this deformation is known as ______ deformation.

a) Inelastic

b) Permanent

c) Elastic ✓

d) Irreversible

05. What will be the linear momentum, If the mass of the body is doubled and its velocity becomes half.

a) Remain the same ✓

b) Become four times

c) Become double

d) Become half

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

a) 4 Ncm-2 ✓

b) 0.35 Ncm-2 

c) 100 Ncm-2 

d) 0.8 Ncm-2 

07. The object will float on the liquid surface when:

(a) W = F

(b) W < F  ✓

(c) W > F

(d) None of above

08. Which of the following is true for the third law of motion?

a) Act on either body at normal to each other

b) Action-Reaction pairs have the same magnitudes and directions

c) Action-Reaction pair always acts on the same body

d) They act on different bodies in opposite directions ✓

09. If the velocity of the object is 5 m/s and the linear momentum of an object is 250 g cm/s, then the mass of the object is? 

a) 05 g

b) 0.5 mg

c) 0.5 g ✓

d) Non of these 

10. The pressure in a fluid is greater with:

a) large depth and high density ✓

b) large depth and low density

c) the small depth and high density

d) small depth and low density 

11. _______ is a force is exerted on an area.

a) pressure ✓

b) torque

c) energy

d) Equilibrium 

12. What will be the motion of the train, If a passenger tosses a coin in a moving train, that falls behind him.

a) Along circular tracks

b) Uniform

c) Retarded

d) Accelerated ✓

13. A hydraulic machine works on:

a) Molecular theory

b) Newton's third law of motion

c) Newton's law of gravitation

d) Pascal's law ✓

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

a) Depth ✓

b) Mass

c) Torque

d) Force

15. The force that acts on unit area of an object and thus changes its shape or size is called: 

(a) Stress ✓

(b) Strain

(c) Yong’s Modulus

(d) Elastic limit

16. Within elastic limit, the displacement produced in the spring is directly proportional to the:

a) Increase in length

b) extension produced

c) Force applied ✓

d) Non

17. _____ indicates that how tightly matter is packed together.

a) Volume

b) Weight

c) Density ✓

d) Mass 

18. The ratio of change in length to the original length is called:

(a) Young’s Modulus

(b) Elastic limit

(c) Stress

(d) Tensile strain ✓

19. If we apply a force on a string, the length of spring increases as the force increases. This increase in length of spring is known as:

a) Expansion

b) Extension ✓

c) Elasticity

d) Stretch

20. 01 atmosphere = 

a) 1.013 × 10⁵ Pascal ✓

b) 1.013 × 10⁵ Bar

c) 1.013 × 10⁵ Nm-1

d) 1.013 × 10⁵ Newton 

21. When stress is increased, the strain will: 

(a) Decrease

(b) Increase ✓

(c) Constant

(d) Doubled 

22. Which is more elastic? 

a) Glass

b) Wood

c) Rubber

d) Steel ✓

23. Hydraulic brake works on the principle of: 

(a) Hydraulic press

(b) Pascal law ✓

(c) Joule’s law

(d) Both a & b

24. It is a random arrangement of molecules kept together by weak cohesive forces as well as forces applied by the container's walls.

a) liquid and gas ✓

b) A gas

c) A liquid 

d) Non 

25. The equation for Hooke's law may by written as:

a) x = KF

b) F = KX ✓

c) x = k/F

d) F = k/x

Important MCQs from Class 9 Physics Unit 5 Forces and Matter

Here are some important solved MCQs from from Class 9 Physics Unit 5 Forces and Matter. 

Class 9 Physics Unit 5 Forces and Matter Solved Exercise (Fill in the Blanks)

Here are the solved Fill in the Blanks from Class 9 Physics Unit 5 Forces and Matter.

1. Forces on an object can cause tensile deformation (stretching) and compressive deformation (squashing).
2. Hooke’s Law states that "The extension in spring is proportional to the load applied to it, provided the limit of elasticity is not exceeded.
3. According to Hooke's law, F = kx
4. Pressure is greater when a large force acts on small area.
5. Liquids transmit pressure equally in all directions. This is called Pascal’s law.

Physics Class 9 Chapter 5 Forces and Matter Questions Answers from Sindh Board Textbook Exercise 

Physics Class 9 Chapter 5 Forces and Matter Textbook Exercise comprises Short and Detailed Question Answers. 

Therefore, We have divided this post into two parts. 

Part:01. Short Question Answers

Part:02. Detailed Question Answers

From here, Students can read 9th class Physics Chapter 5 Forces and Matter Short and Long Question Answers from the Sindh Board Textbook.

Students will also be able to download class 9 Physics chapter 5 Forces and Matter question answers in PDF.

Physics Class 9 Chapter 5 Forces and Matter Short Questions with Answers from Textbook Exercise

We are starting this section of the post with Physics Class 9 Chapter 5 Forces and Matter Short Questions with Answers from the Sindh Textbook Exercise.

Q.01: What can a Force do? Give some examples.

Ans: A force is the reason of every movement. Here are some examples of force. 

Q.02: Describe the meaning of elastic limit?

Ans: Elastic limit is defined as; "The elastic limit is the point at which a body returns to its original length, volume, or shape after being deformed. Beyond this limit, springs degrade permanently."

Q.03: State Hooke's Law. 

Ans: Hooke's law states that:

"Within elastic limit, the displacement produced in the spring is directly proportional to the force applied."

Q.04: Write down the S.I unit of pressure?

Ans: The pressure is defined as; "Force per unit Area". 

The Force is measured in "Newton" and Areas is measured in "Square meters (m²)". 

Therefore in SI system unit of pressure is newton per square meter (Nm-2). 

It is also known as Pascal (Pa). 

Q.05: Define the term Elasticity. 

Ans: It is the property of a body to regain its original shape and size when external forces are removed. 

Physics Class 9 Chapter 5 Forces and Matter Detailed Questions with Answers from Textbook Exercise

Here are the Physics Class 9 Chapter 5 Forces and Matter Detailed Questions with Answers from the Sindh Textbook Exercise.

Q.01: Why does pressure increases as you dig deeper; Explain in detail.

Ans. Pressure is force per unit area, therefore pressure and depth are directly proportional. 

In this scenario, the primary force is the weight of the overlaying rock. So, in very simple terms, the deeper we go, the more rock must be maintained, requiring more force and increasing pressure. 

The same phenomenon happens in the ocean and in the atmosphere. The deeper we go into the ocean, the higher the pressure. In addition, the density of air in the atmosphere increases towards the earth's surface due to gravity. As a result, lower altitudes have higher air pressure and density.

Q.02: How solids are deformed? Explain in detail.

Ans: We have performed an experiment to explain the deformation of solids.

Physics Class 9 Chapter 5 Forces and Matter Solved Numericals from Textbook Exercise

Here are the Physics Class 9 Chapter 5 Forces and Matter Solved Numericals from Textbook Exercise.

01. A spring has spring constant k = 30 Nm–1. What load is required to produce an extension of 4 m?

Ans:

02. A boy presses a thumbtack into a piece of wood with 20 N of Force. The surface area of the thumbtack's head is 1 cm², while the tip has a cross-sectional area of 0.01 cm².

Calculate:

a) The pressure exerted by boy's thumb on the head of thumbtack.

b) The pressure of the tip of the thumbtack on the wood.

Solution: 

Q.03: Calculate the spring constant for a spring which extends by a distance of 3.5cm when a load of 14 N is hung from its end.

Solution: