Class 9 Science MCQ – Force, Motion, Matter and Tissues

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Practice Class 9 Science MCQ Questions with Answers based on NCERT concepts. Revise force, muscle tissue, electron charge, speed formula, and diffusion with clear explanations, important concepts, exam tips, and revision notes.

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Chapter Information

• Subject: Science
• Class: 9
• Question Type: Multiple Choice Questions (MCQs)
• Difficulty Level: Easy to Moderate
• Based On: NCERT Class 9 Science concepts
• Topics Covered: Force, Tissues, Atoms, Motion, Matter

Introduction

Science becomes easier when important concepts are revised regularly through short practice questions. This Class 9 Science MCQ practice set covers fundamental concepts related to force, muscle tissue, electron charge, speed, and diffusion.

Each question includes the correct answer along with a concept-based explanation for exam preparation, helping students understand the idea rather than simply memorize the answer.

What You Will Learn

✔ SI unit of force
✔ Function of muscle tissue
✔ Charge of an electron
✔ Formula for speed
✔ Basic idea of diffusion

Why This Topic Is Important

These concepts are fundamental parts of Class 9 Science. Understanding them helps students build a strong foundation for topics in physics, chemistry, and biology and prepares them for school examinations and future science studies.

Q1. Diffusion occurs due to:

A) Particle motion
B) Gravity
C) Pressure
D) Heat

Answer:

Particle motion

Explanation for Exam:

Diffusion occurs because particles of matter are continuously moving. Due to this random motion, particles spread from a region of higher concentration toward a region of lower concentration until they become more evenly distributed.

Exam Tip:

The main reason behind diffusion is the continuous motion of particles.

Diffusion is the process in which particles move from a region of higher concentration to a region of lower concentration.

Reason for diffusion:
Particles are always in continuous motion, so they spread naturally.

Important Points:

• Diffusion occurs in solids, liquids, and gases
• It is fastest in gases because particles move freely

Examples:

• Smell of perfume spreading in a room
• Ink spreading in water

Importance:
Diffusion helps in mixing substances naturally.

Q2. SI unit of force:

A) Watt
B) Newton
C) Pascal
D) Joule

Answer:

Newton

Explanation for Exam:

Force is a push or pull that can change the state of motion or shape of an object. The SI unit used to measure force is the newton (N).

The other units represent different physical quantities:

• Watt → Power
• Pascal → Pressure
• Joule → Work/Energy

Exam Tip:

Remember: Force → Newton (N).

Force is measured in Newton (N), which is the SI unit of force.

Meaning of force:
Force is a push or pull that can change the motion or shape of an object.

Formula:
Force = Mass × Acceleration

Named after:
Sir Isaac Newton

Examples:

• Pushing a door
• Pulling a cart
• Kicking a football

Importance:
Force is required to move, stop, or change the direction of objects.

Q3. Electron is:

A) Positive
B) Negative
C) Heavy
D) Neutral

Answer:

Negative

Explanation for Exam:

An electron is a subatomic particle that carries a negative electric charge. In an electrically neutral atom, the number of electrons is equal to the number of protons.

Exam Tip:

Remember the basic charges:

• Electron → Negative
• Proton → Positive
• Neutron → Neutral

An electron is a tiny subatomic particle present outside the nucleus of an atom.

Charge on electron:

• Negative charge

Comparison with other particles:

• Proton → positive charge
• Neutron → neutral
• Electron → negative charge

Importance:
Electrons are responsible for electric current and chemical bonding.

Example:
Flow of electrons in wires produces electricity.

Q4. Speed =

A) Force/time
B) Work/time
C) Distance/time
D) Mass/time

Answer:

Distance/time

Important Formula:

$$\text{Speed}=\frac{\text{Distance}}{\text{Time}}$$

Explanation for Exam:

Speed tells us how much distance an object covers in a given amount of time. Therefore, speed is calculated by dividing the total distance travelled by the total time taken.

Exam Tip:

Always remember: $$\boxed{\text{Speed}=\frac{\text{Distance}}{\text{Time}}}$$

Speed tells us how fast an object moves.

Formula:
Speed = Distance ÷ Time

Understanding:

• Greater distance in less time → higher speed
• Smaller distance in more time → lower speed

Units of speed:

• m/s (meter per second)
• km/h (kilometer per hour)

Examples:

• Speed of a car
• Running speed of an athlete

Importance:
Speed helps compare the motion of different objects.

Q5. Muscle tissue helps in:

A) Protection
B) Movement
C) Transport
D) Storage

Answer:

Movement

Explanation for Exam:

Muscle tissue is specialized to contract and relax. This property enables different parts of the body to move. Muscles therefore play an important role in body movement and other movements inside the body.

Exam Tip:

The key function of muscle tissue is movement through contraction and relaxation.

Muscle tissue helps in the movement of the body.

How muscles work:
Muscles contract and relax to produce movement.

Types of muscle tissue:

• Skeletal muscles → movement of bones
• Smooth muscles → movement inside organs
• Cardiac muscles → movement of the heart

Importance:
Muscles help in walking, running, breathing, and other body movements.

Example:
Arm muscles help lift objects and perform physical activities.

Related Links

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• Class 9 Maths Chapter 3 Coordinate Geometry part-3
• Class 9 English Chapter 1 The Fun They Had part-1
• Class 9 Social Science Chapter 1: The French Revolution part-2
• Class 9 Science Chapter 1 Matter in Our Surroundings part-3

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