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Practice Class 9 Science MCQ Questions with Answers based on the latest NCERT syllabus. Learn about electron charge, muscle tissue, SI unit of speed, centripetal force, and diffusion with detailed explanations, formulas, exam tips, and NCERT-based solutions for CBSE and State Board students.
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Chapter Information
Subject: Science
Class: 9
Topics Covered:
- Structure of the Atom
- Tissues
- Motion
- Force and Laws of Motion
- Matter in Our Surroundings
Question Type: Multiple Choice Questions (MCQs)
Difficulty Level: Easy to Moderate
Based On: Latest NCERT Syllabus
Introduction
Class 9 Science introduces important concepts from Physics, Chemistry, and Biology that explain the behaviour of matter, living organisms, and moving objects. Topics such as atomic particles, tissues, speed, circular motion, and diffusion are essential for understanding advanced scientific concepts. This practice set provides concept-based MCQs with detailed explanations to help students strengthen their fundamentals and prepare confidently for examinations.
What You Will Learn
✔ Electric charge of an electron
✔ Function of muscle tissue
✔ SI unit of speed
✔ Centripetal force in circular motion
✔ Diffusion in different states of matter
✔ Important NCERT concepts
Why This Topic Is Important?
These concepts form the basis of many chapters in higher classes and are frequently asked in CBSE, State Board, Olympiad, and scholarship examinations. Understanding them also helps students relate scientific principles to everyday life and practical applications.
Exam Relevance
These questions are useful for:
✔ CBSE Exams
✔ State Board Exams
✔ School Tests
✔ Unit Tests
✔ Half-Yearly Exams
✔ Annual Exams
✔ Olympiad Preparation
✔ Scholarship Examinations
Q1. Electron charge:
A) Positive
B) Negative
C) Variable
D) Neutral
Answer: Negative
Concept Behind This Question
Atoms are made up of three fundamental particles: electrons, protons, and neutrons, each having a specific electric charge.
Step-by-Step Solution
An electron carries a negative electric charge.
The other subatomic particles are:
- Proton → Positive charge
- Neutron → No charge (neutral)
Since the electron always has a negative charge, the correct answer is Negative.
Therefore, the correct answer is: Negative.
Exam Tip
Remember:
- Electron → Negative (−)
- Proton → Positive (+)
- Neutron → Neutral (0)
Q2. Muscle tissue helps in:
A) Movement
B) Circulation
C) Respiration
D) Digestion
Answer: Movement
Concept Behind This Question
Muscle tissue contracts and relaxes to produce movement in the body.
Step-by-Step Solution
Muscles are responsible for moving different parts of the body. They work together with bones and joints to perform activities such as walking, running, lifting objects, and writing.
Although muscles also help in functions like circulation and digestion, their primary function is movement.
Therefore, the correct answer is: Movement.
Exam Tip
Remember:
Muscle Tissue → Movement
Nervous Tissue → Control and Coordination
Q3. SI unit of speed:
A) s
B) m/s
C) km
D) m
Answer: m/s (metre per second)
Useful Formula for This Question
$$\text{Speed}=\frac{\text{Distance}}{\text{Time}}$$
Concept Behind This Question
Speed measures the distance travelled by an object in a given time.
Step-by-Step Solution
The SI unit of distance is metre (m) and the SI unit of time is second (s).
Therefore,
$$\text{SI Unit of Speed}=\frac{\text{metre}}{\text{second}}=m/s$$
Therefore, the correct answer is: m/s.
Exam Tip
Do not confuse:
- m/s → Speed
- m → Distance
- s → Time
Q4. Circular motion requires:
A) Centripetal force
B) Momentum
C) Gravity
D) Friction
Answer: Centripetal force
Concept Behind This Question
An object moving in a circular path requires a force directed toward the centre of the circle.
Step-by-Step Solution
Without centripetal force, an object would continue moving in a straight line due to inertia.
Centripetal force continuously changes the direction of motion, keeping the object on its circular path.
Examples include:
- A satellite orbiting Earth
- A stone tied to a string and whirled in a circle
Therefore, the correct answer is: Centripetal force.
Exam Tip
Remember:
Circular Motion → Centripetal Force towards the Centre
Q5. Diffusion is fastest in:
A) Gas
B) Plasma
C) Solid
D) Liquid
Answer: Gas
Concept Behind This Question
Diffusion depends on the speed and spacing of particles.
Step-by-Step Solution
Gas particles move much faster and are farther apart than particles in liquids and solids. As a result, they mix with one another more quickly.
Therefore, diffusion occurs:
Gas > Liquid > Solid
Therefore, the correct answer is: Gas.
Exam Tip
Remember:
The greater the movement of particles, the faster the diffusion.
Important Formulas & Concepts
1. Speed
$$\text{Speed}=\frac{\text{Distance}}{\text{Time}}$$
SI Unit: m/s
2. Fundamental Particles of an Atom
| Particle | Charge |
| Electron | Negative (−) |
| Proton | Positive (+) |
| Neutron | Neutral (0) |
3. Muscle Tissue
Functions:
- Produces body movement
- Maintains posture
- Helps in internal body movements
4. Circular Motion
An object moving in a circular path requires centripetal force, which always acts toward the centre of the circle.
5. Diffusion
Diffusion is the movement of particles from a region of higher concentration to a region of lower concentration.
Rate of diffusion:
Gas > Liquid > Solid
6. SI Units
- Distance → metre (m)
- Time → second (s)
- Speed → metre per second (m/s)
Related Practice Questions
- What is the charge on a proton?
- Name the three types of muscle tissue.
- What is the SI unit of velocity?
- Why is centripetal force necessary in circular motion?
- Why does the smell of perfume spread quickly in a room?
Mini Quiz Challenge
True or False
- Electrons carry a positive charge.
- Muscle tissue helps in movement.
- The SI unit of speed is m/s.
- Circular motion requires centripetal force.
- Diffusion is fastest in gases.
Exam Tips
✔ Learn the properties of electrons, protons, and neutrons.
✔ Remember the functions of different tissues.
✔ Memorize SI units of common physical quantities.
✔ Understand the role of centripetal force in circular motion.
✔ Compare diffusion in solids, liquids, and gases.
Quick Revision Notes
✔ Electron carries a negative charge.
✔ Muscle tissue enables movement.
✔ SI unit of speed is m/s.
✔ Circular motion requires centripetal force.
✔ Diffusion is fastest in gases.
✔ Gas particles move more freely than liquid and solid particles.
Common Mistakes Students Make
❌ Confusing the charges of electrons and protons.
❌ Assuming muscle tissue is responsible only for circulation.
❌ Writing km/h as the SI unit of speed.
❌ Thinking gravity is always responsible for circular motion.
❌ Believing diffusion occurs equally fast in all states of matter.
Key Takeaways
- Electrons have a negative electric charge.
- Muscle tissue is primarily responsible for body movement.
- The SI unit of speed is metre per second (m/s).
- Centripetal force keeps an object moving in a circular path.
- Diffusion occurs most rapidly in gases because their particles move freely.
FAQs
1. What is the charge on an electron?
An electron carries a negative electric charge.
2. What is the main function of muscle tissue?
Muscle tissue helps produce movement by contracting and relaxing.
3. What is the SI unit of speed?
The SI unit of speed is metre per second (m/s).
4. Why is centripetal force required in circular motion?
Centripetal force continuously changes the direction of an object, allowing it to move along a circular path.
5. In which state of matter is diffusion the fastest?
Diffusion is fastest in gases because gas particles move rapidly and have large spaces between them.
Conclusion
This Class 9 Science MCQ Practice Set covers important NCERT concepts from atomic structure, tissues, motion, force, and matter. Regular practice of these concept-based questions helps students strengthen conceptual understanding, improve scientific reasoning, and perform better in school examinations and competitive tests.
NCERT Reference
Book: NCERT Science Class 9
Relevant Chapters:
- Chapter 1: Matter in Our Surroundings
- Chapter 4: Structure of the Atom
- Chapter 6: Tissues
- Chapter 8: Motion
- Chapter 9: Force and Laws of Motion
Based On: Latest NCERT Curriculum (CBSE)
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