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Practice Class 9 Science MCQ Questions with Answers based on the latest NCERT syllabus. Learn about meristematic tissue, properties of gases, valency, balanced forces, and the SI unit of acceleration with original concept-based explanations, exam-focused notes, and NCERT-aligned content for CBSE and State Board students.
Do You Know
Chapter Information
Subject: Science
Class: 9
Chapters Covered:
- Tissues
- Matter in Our Surroundings
- Structure of the Atom
- Force and Laws of Motion
- Motion
Question Type: Multiple Choice Questions (MCQs)
Difficulty Level: Easy to Moderate
Based On: Latest NCERT Syllabus
Introduction
Class 9 Science introduces students to the basic principles of Biology, Chemistry, and Physics. Understanding plant tissues, properties of matter, atomic structure, forces, and motion helps students develop strong scientific reasoning. This practice set provides original, concept-based explanations that are fully aligned with the latest NCERT syllabus and useful for school as well as competitive examinations.
What You Will Learn
✔ Function of meristematic tissue
✔ Properties of gases
✔ Meaning of valency
✔ Balanced forces
✔ SI unit of acceleration
Why This Topic Is Important?
These concepts form the foundation of many higher-level Science topics and are commonly asked in CBSE, State Board, Olympiad, and scholarship examinations. A strong understanding of these fundamentals improves conceptual clarity and problem-solving skills.
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. Gas fills:
A) Shape
B) Volume
C) Space
D) Container
Answer
Container
Concept
Gases have neither a fixed shape nor a fixed volume.
Explanation
Gas particles move freely in all directions and spread out to occupy all the available space inside a container. Therefore, a gas always takes both the shape and volume of its container.
Exam Focus
Remember: Gases completely fill the container in which they are kept.
NCERT Reference: Chapter 1 (Matter in Our Surroundings)
- Description: The particles of gas have negligible forces of attraction between them and possess high kinetic energy. Because of this, gas particles move rapidly in all directions and hit the walls of the vessel, completely filling the container in which they are kept. They have neither a fixed shape nor a fixed volume.
Q2. Balanced Force
A) No change
B) Changes motion
C) Increases speed
D) Stops object
Answer
No change
Concept
Balanced forces are equal in magnitude and opposite in direction.
Explanation
When balanced forces act on an object, the net force becomes zero. As a result, there is no change in the object’s state of motion. The object either remains at rest or continues moving with uniform velocity.
Exam Focus
Remember: Balanced forces do not change the state of motion.
NCERT Reference: Chapter 8 (Force and Laws of Motion)
- Description: When multiple forces act on an object and their resultant (net force) is zero, they are called balanced forces. Balanced forces cannot change the state of rest or motion of an object; they can only change its shape. Therefore, there is no change in the object’s motion.
Q3. Valency means:
A) Charge
B) Mass
C) Combining capacity
D) Energy
Answer
Combining capacity
Concept
Valency describes the ability of an atom to combine with other atoms.
Explanation
Valency is the combining capacity of an atom. It depends on the number of electrons an atom gains, loses, or shares to achieve a stable electronic configuration while forming chemical bonds.
Exam Focus
Remember: Valency = Combining capacity of an atom.
NCERT Reference: Chapter 4 (Structure of the Atom)
- Description: The electrons present in the outermost shell of an atom are known as valence electrons. The number of electrons gained, lost, or shared so as to make the octet of electrons in the outermost shell gives us the combining capacity of the element, which is called Valency.
Q4. Unit of acceleration:
A) m²
B) m/s
C) m/s²
D) s²
Answer
$$\mathrm{m/s^2}$$
Concept
Acceleration measures the rate of change of velocity.
Explanation
Acceleration is defined as the change in velocity per unit time.
Formula
$$a=\frac{v-u}{t}$$
Where:
- $$a$$ = Acceleration
- $$u$$ = Initial velocity
- $$v$$ = Final velocity
- $$t$$ = Time taken
The SI unit of acceleration is:
$$\mathrm{m/s^2}$$
Exam FocusRemember: SI Unit of Acceleration = m/s²
NCERT Reference: Chapter 7 (Motion)
- Description: Acceleration is defined as the rate of change of velocity per unit of time. $$a = \frac{v – u}{t}$$ Since the unit of velocity is $$m/s$$ and time is $$s$$, the SI unit of acceleration is $$m/s^2$$ (meters per second squared).
Q5. Meristem helps in:
A) Growth
B) Transport
C) Storage
D) Protection
Answer
Growth
Concept
Meristematic tissue contains actively dividing cells responsible for plant growth.
Explanation
Meristematic tissue continuously produces new cells through cell division. These new cells increase the length and thickness of plants, resulting in primary and secondary growth.
Exam Focus
Remember: Meristematic tissue is responsible for plant growth.
NCERT Reference: Chapter 6 (Tissues)
- Description: The growth of plants occurs only in certain specific regions. This is because the dividing tissue, also known as meristematic tissue, is located only at these points. These cells are very active and divide continuously to help in the growth (length and girth) of the plant.
Important Formulas & Concepts
1. Meristematic Tissue
Functions:
- Produces new cells.
- Helps in plant growth.
- Found at root tips, shoot tips, and cambium.
2. Properties of Gases
- No fixed shape.
- No fixed volume.
- Fill the entire container.
- Highly compressible.
- Weak intermolecular forces.
3. Valency
Definition:
The combining capacity of an atom.
Examples:
- Hydrogen = 1
- Oxygen = 2
- Carbon = 4
- Nitrogen = 3
4. Balanced Forces
Characteristics:
- Equal magnitude.
- Opposite direction.
- Net force = 0.
- No change in the state of motion.
5. Acceleration
Formula:
$$a=\frac{v-u}{t}$$
SI Unit:
$$\mathrm{m/s^2}$$
Related Practice Questions
- What is the function of meristematic tissue?
- Why do gases completely fill a container?
- Define valency with one example.
- What are balanced forces?
- Write the formula and SI unit of acceleration.
Mini Quiz Challenge
True or False
- Meristematic tissue helps in plant growth.
- Gases have a fixed shape.
- Valency represents the combining capacity of an atom.
- Balanced forces produce acceleration.
- The SI unit of acceleration is m/s².
Exam Tips
✔ Learn the locations and functions of meristematic tissue.
✔ Remember that gases take the shape and volume of their container.
✔ Do not confuse valency with electric charge.
✔ Understand the difference between balanced and unbalanced forces.
✔ Memorize the formula and SI unit of acceleration.
Quick Revision Notes
✔ Meristematic tissue helps plants grow.
✔ Gases fill the entire container.
✔ Valency means combining capacity.
✔ Balanced forces do not change the state of motion.
✔ Acceleration:
$$a=\frac{v-u}{t}$$
✔ SI Unit of Acceleration:
$$\mathrm{m/s^2}$$
Common Mistakes Students Make
❌ Confusing meristematic tissue with permanent tissue.
❌ Thinking gases have a fixed shape.
❌ Assuming valency is the same as electric charge.
❌ Believing balanced forces always stop an object.
❌ Writing the SI unit of acceleration as m/s instead of m/s².
Key Takeaways
- Meristematic tissue is responsible for the growth of plants.
- Gases expand to fill the entire container in which they are kept.
- Valency represents the combining capacity of an atom.
- Balanced forces have zero net force and do not change an object’s state of motion.
- The SI unit of acceleration is m/s².
FAQs
1. What is the function of meristematic tissue?
Meristematic tissue continuously divides to produce new cells, helping in the growth of plants.
2. Why do gases fill the entire container?
Gas particles move freely in all directions and spread out to occupy all the available space inside the container.
3. What is valency?
Valency is the combining capacity of an atom during chemical bond formation.
4. What are balanced forces?
Balanced forces are equal and opposite forces that produce zero net force, causing no change in the state of motion.
5. What is the SI unit of acceleration?
The SI unit of acceleration is
$$\mathrm{m/s^2}$$
NCERT Reference
Book: NCERT Science Class 9
Chapters Covered:
- 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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