Chapter Information

Class: 9

Subject: Science

Quiz Type: Mixed Chapter Revision MCQ Quiz

Difficulty Level: Easy to Moderate

Based On: Latest NCERT Curriculum

Estimated Reading Time: 10–12 Minutes

Chapters Covered

• Chapter 1: Matter in Our Surroundings
• Chapter 3: Atoms and Molecules
• Chapter 6: Tissues
• Chapter 8: Motion
• Scientific Measurement (SI Units – Basic Science Concept)

Introduction

Science is a subject that helps us understand the natural world through observation, experimentation, and logical reasoning. In Class 9, students are introduced to several important concepts that become the foundation for higher studies in Physics, Chemistry, and Biology.

This mixed MCQ quiz brings together questions from different chapters of the NCERT Class 9 Science syllabus, including SI units, plant tissues, motion, atomic theory, and states of matter. These topics are frequently asked in school examinations because they test a student’s understanding of basic scientific concepts rather than simple memorization.

Each question in this quiz is accompanied by a detailed explanation that helps students understand why the correct answer is right and why the other options are incorrect. This approach improves conceptual learning, builds confidence, and enhances problem-solving skills.

Whether you are preparing for unit tests, periodic assessments, annual examinations, scholarship tests, or simply revising important NCERT concepts, this quiz provides an effective way to strengthen your preparation.

What You Will Learn

After completing this quiz, you will be able to:

• Identify the SI unit of mass and understand its importance in scientific measurements.
• Explain the function of xylem tissue in transporting water within plants.
• Understand the definition of speed and its basic formula.
• Learn about John Dalton’s contribution to modern atomic theory.
• Differentiate between the physical states of matter based on their shape and volume.
• Strengthen your conceptual understanding through detailed explanations.
• Improve your accuracy while solving NCERT-based multiple-choice questions.

Why This Topic Is Important

The concepts included in this quiz are among the most fundamental topics in the Class 9 Science curriculum. They form the basis for understanding advanced chapters in Physics, Chemistry, and Biology and are regularly included in school examinations.

Learning these concepts helps students:

• Build a strong scientific foundation for higher classes.
• Improve conceptual clarity instead of relying on rote learning.
• Solve objective questions with greater confidence and accuracy.
• Understand the practical applications of scientific principles in everyday life.
• Prepare effectively for school exams, Olympiads, scholarship tests, and other competitive examinations.

A thorough understanding of SI units, plant tissues, motion, atomic theory, and states of matter also makes future Science topics easier to learn and apply.

Question 1

The SI unit of mass is:

Correct Answer : Kilogram

Detailed Explanation

The SI (International System of Units) is the globally accepted system of measurement used in Science. The SI unit of mass is the kilogram (kg).

Mass represents the amount of matter present in an object. Unlike weight, mass remains constant regardless of location.

Examples

• A school bag may have a mass of 3 kg.
• A bag of rice may have a mass of 10 kg.

Important Difference

• Mass → Measured in Kilogram (kg)
• Weight → Measured in Newton (N)

Key Concept

Kilogram (kg) is the SI unit of mass, while Newton (N) is the SI unit of force.

Question 2

Which tissue transports water in plants?

Correct Answer : Xylem

Detailed Explanation

Xylem is a complex permanent tissue responsible for transporting water and dissolved minerals from the roots to the stem, leaves, and other parts of the plant.

It also provides mechanical support to the plant.

Functions of Xylem

• Transports water.
• Carries dissolved minerals.
• Provides structural support.

Difference Between Xylem and Phloem

Key Concept

Xylem = Water Transport
Phloem = Food Transport

Question 3

Speed is defined as:

Correct Answer : Distance ÷ Time

Detailed Explanation

Speed is the distance travelled by an object in a given amount of time. It tells us how fast or slow an object is moving.

Formula

Speed = Distance ÷ Time

SI Unit

Metre per second (m/s)

Example

If a car travels 120 metres in 10 seconds:

Speed = 120 ÷ 10 = 12 m/s

Key Concept

Speed depends only on the total distance travelled and time taken.

Question 4

Who proposed atomic theory?

Correct Answer : Dalton

Detailed Explanation

The modern Atomic Theory was proposed by the English scientist John Dalton in 1808.

According to Dalton:

• Matter is made up of tiny particles called atoms.
• Atoms cannot be created or destroyed during a chemical reaction.
• Atoms of the same element are identical in mass and properties.
• Atoms combine in simple whole-number ratios to form compounds.

Although some parts of Dalton’s theory were later modified, it remains the foundation of modern chemistry.

Key Concept

John Dalton is known as the Father of Modern Atomic Theory.

Question 5

Which state of matter has definite volume but no definite shape?

Correct Answer : Liquid

Detailed Explanation

Liquids have a fixed volume but do not have a fixed shape. They take the shape of the container in which they are kept.

This happens because the particles in a liquid are close together but can move freely past one another.

Comparison of States of Matter

Examples of Liquids

• Water
• Milk
• Cooking oil
• Juice

Key Concept

Liquids flow easily because their particles can move while remaining close together.

Important Formulas & Concepts

Speed Formula

Speed = Distance ÷ Time

SI Unit: Metre per second (m/s)

SI Unit of Mass

Mass = Kilogram (kg)

Water Transport in Plants

Xylem → Water and Minerals

Phloem → Food

States of Matter

• Solid → Fixed shape and fixed volume
• Liquid → Fixed volume but no fixed shape
• Gas → No fixed shape and no fixed volume

Related Practice Questions

1. What is the SI unit of force?
2. Kilogram
3. Newton
4. Joule
5. Watt
6. Which tissue transports food in plants?
7. Xylem
8. Phloem
9. Parenchyma
10. Collenchyma
11. Which quantity is measured in metre per second (m/s)?
12. Force
13. Speed
14. Mass
15. Energy
16. Who discovered the nucleus of an atom?
17. Dalton
18. Thomson
19. Rutherford
20. Bohr
21. Which state of matter has both a definite shape and a definite volume?
22. Gas
23. Liquid
24. Plasma
25. Solid

Mini Quiz Challenge

Try answering these questions without looking back:

1. What is the SI unit of mass?
2. Which plant tissue transports water?
3. Write the formula for speed.
4. Who proposed the Atomic Theory?
5. Which state of matter has a definite volume but no definite shape?

Exam Tips

Preparing for Class 9 Science becomes easier when you focus on understanding concepts rather than memorizing facts. Follow these tips to improve your performance in school examinations:

• Read each NCERT chapter carefully before attempting MCQs.
• Learn all important SI units and scientific terms.
• Practice formulas regularly and understand their applications.
• Revise the functions of different plant tissues using diagrams and tables.
• Understand the basic ideas of Dalton’s Atomic Theory instead of memorizing statements.
• Compare the properties of solids, liquids, and gases to avoid confusion.
• Solve chapter-wise and mixed-topic MCQs to improve speed and accuracy.
• Revise important concepts regularly instead of studying everything at the last moment.

Quick Revision Notes

SI Unit of Mass

• The SI unit of mass is Kilogram (kg).
• Mass is the amount of matter present in an object.
• Mass remains constant irrespective of location.

Plant Tissues

Xylem

• Transports water and minerals.
• Movement is mainly upward.
• Provides mechanical support to the plant.

Phloem

• Transports prepared food.
• Food moves from leaves to other parts of the plant.
• Transport can occur in both upward and downward directions.

Motion

Speed

• Speed tells us how fast an object moves.
• Formula:

Speed = Distance ÷ Time

• SI Unit: metre per second (m/s)

Atomic Theory

• Proposed by John Dalton.
• Matter is made of tiny particles called atoms.
• Atoms combine to form compounds.
• Atoms are neither created nor destroyed during ordinary chemical reactions.

States of Matter

Solid

• Fixed shape
• Fixed volume

Liquid

• No fixed shape
• Fixed volume

Gas

• No fixed shape
• No fixed volume

Common Mistakes Students Make

Students often lose marks because of small conceptual errors. Avoid these common mistakes:

• Confusing mass with weight.
• Writing gram (g) instead of kilogram (kg) as the SI unit of mass.
• Mixing up the functions of xylem and phloem.
• Confusing speed with velocity.
• Forgetting that speed is based on distance, not displacement.
• Confusing Dalton, Thomson, Rutherford, and Bohr while answering questions on atomic models.
• Thinking that liquids have both a fixed shape and a fixed volume.
• Memorizing definitions without understanding the scientific concepts.

Important Formulas & Concepts

Speed Formula

Speed = Distance ÷ Time

SI Unit: metre per second (m/s)

SI Unit of Mass

Kilogram (kg)

Water Transport in Plants

Xylem → Water and Minerals

Phloem → Food

Dalton’s Atomic Theory

• Matter is made up of atoms.
• Atoms of the same element are identical in chemical properties.
• Atoms combine in simple whole-number ratios to form compounds.

Properties of Matter

Key Takeaways

• Kilogram (kg) is the SI unit of mass.
• Xylem transports water and minerals in plants.
• Speed is calculated using the formula Distance ÷ Time.
• John Dalton proposed the Atomic Theory.
• Liquids have a fixed volume but no fixed shape.
• Understanding concepts is more effective than memorizing answers.
• Regular NCERT revision improves confidence and exam performance.

Frequently Asked Questions (FAQs)

1. What is the SI unit of mass?

The SI unit of mass is Kilogram (kg).

2. Which tissue transports water in plants?

Xylem transports water and dissolved minerals from the roots to different parts of the plant.

3. What is the formula for speed?

The formula for speed is:

Speed = Distance ÷ Time

4. Who proposed the Atomic Theory?

The Atomic Theory was proposed by John Dalton in 1808.

5. Which state of matter has a definite volume but no definite shape?

A liquid has a definite volume but takes the shape of its container.

6. What is the difference between xylem and phloem?

Xylem transports water and minerals, whereas phloem transports prepared food from the leaves to other parts of the plant.

7. Why are SI units important in Science?

SI units provide a universal system of measurement, ensuring accuracy and consistency in scientific experiments, calculations, and communication around the world.

Conclusion

The topics covered in this Class 9 Science mixed revision quiz form the foundation of many important concepts in Physics, Chemistry, and Biology. Understanding SI units, plant tissues, motion, atomic theory, and states of matter helps students build strong scientific knowledge and improves their problem-solving skills.

Regular practice of NCERT-based MCQs, along with revision of important formulas, definitions, and concepts, will improve conceptual clarity and boost confidence in school examinations. Focus on understanding the logic behind each concept rather than memorizing answers to achieve better academic success.

Reference

This educational content is prepared for learning and practice purposes based on the concepts covered in the NCERT Science Textbook for Class 9 (Latest Edition). The explanations, revision notes, practice questions, and FAQs are written in original language to simplify learning and strengthen conceptual understanding.

Source: NCERT Science Textbook for Class 9 (Latest Edition), including concepts from Chapter 1 (Matter in Our Surroundings), Chapter 3 (Atoms and Molecules), Chapter 6 (Tissues), Chapter 8 (Motion), and SI Units from the NCERT Science curriculum, published by the National Council of Educational Research and Training (NCERT), India.