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Practice Class 9 Science MCQ questions based on NCERT concepts covering force, epithelial tissue, distance, mass number, and freezing point of water with clear exam-focused explanations and revision notes.
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Chapter Information
Subject: Science
Class: 9
Question Type: Multiple Choice Questions (MCQs)
Difficulty Level: Moderate
Based On: NCERT-aligned concepts
Introduction
This Class 9 Science MCQ practice set covers important concepts from Force and Motion, Tissues, Atoms and Molecules, and Matter in Our Surroundings. These questions are designed to strengthen conceptual understanding and provide useful practice for school examinations.
What You Will Learn
✔ Force as a vector quantity
✔ Main function of epithelial tissue
✔ Distance as a scalar quantity
✔ Mass number of an atom
✔ Freezing point of water
Why This Topic Is Important
These are fundamental Class 9 Science concepts that are useful for solving objective and conceptual questions. A clear understanding of these basics also helps students prepare for more advanced topics in higher classes.
Exam Relevance
These MCQs are useful for:
✔ NCERT-based examinations
✔ School tests
✔ Unit tests
✔ Half-yearly examinations
✔ Annual examinations
✔ Science revision
Q1. Force is a:
A) Scalar
B) Vector
C) Both
D) None
Answer:
Vector
Concept / Exam Explanation
Force has both magnitude and direction. A physical quantity that has both magnitude and direction is called a vector quantity.
Therefore, force is a vector quantity.
For example, saying that a force of 10 N acts towards the right gives both its magnitude and direction.
Exam Tip
Remember:
Force → Vector quantity
Distance → Scalar quantity
Displacement → Vector quantity
Q2. Epithelial tissue function:
(एपिथीलियल ऊतक (Epithelial tissue) का कार्य:)
A) Transport (परिवहन)
B) Protection (सुरक्षा)
C) Storage (भंडारण)
D) Movement (गति)
Answer:
Protection (सुरक्षा)
Concept / Exam Explanation
Epithelial tissue forms the covering or lining of many parts of the body. It protects underlying tissues and organs from physical damage, pathogens, and other external influences.
For example, the outer layer of the skin contains epithelial tissue that helps protect the body.
Exam Tip
The key function to remember for this question is:
Epithelial tissue → Protection and covering
Q3. Distance is:
A) Vector
B) Scalar
C) Both
D) None
Answer:
Scalar
Concept / Exam Explanation
Distance represents the total length of the path travelled by an object. It has magnitude but does not require a direction.
Therefore, distance is a scalar quantity.
For example, if a student walks 500 m, the distance travelled is:
$$500,m$$
No direction is required to describe the distance.
Exam Tip
Remember the important difference:
Distance → Scalar
Displacement → Vector
Q4. Mass number =
A) Neutrons
B) Protons
C) Electrons
D) Protons + neutrons
Answer:
Protons + neutrons
Concept / Exam Explanation
The mass number of an atom represents the total number of protons and neutrons present in its nucleus.
Therefore:
$$\text{Mass Number}=\text{Number of Protons}+\text{Number of Neutrons}$$
Electrons are not included in the mass number because their mass is extremely small compared with protons and neutrons.
Exam Tip
Remember:
$$A=Z+N$$
where:
- $$A$$ = mass number
- $$Z$$ = number of protons
- $$N$$ = number of neutrons
Q5. Freezing point of water:
A) $$0^\circ C$$
B) $$-10^\circ C$$
C) $$100^\circ C$$
D) $$50^\circ C$$
Answer:
$$0^\circ C$$
Concept / Exam Explanation
Under normal atmospheric pressure, pure water freezes at:
$$0^\circ C$$
At this temperature, water changes from its liquid state to its solid state, forming ice.
Exam Tip
Remember the two important temperatures for water at normal atmospheric pressure:
Freezing point → $$0^\circ C$$
Boiling point → $$100^\circ C$$
Important Formulas & Concepts
1. Force
Force is a vector quantity because it has magnitude and direction.
2. Distance
Distance is a scalar quantity because it has magnitude but no direction.
3. Mass Number
$$A=Z+N$$
or
$$\text{Mass Number}=\text{Protons}+\text{Neutrons}$$
4. Freezing Point of Water
$$0^\circ C$$
5. Epithelial Tissue
Main functions → Protection, covering, and lining
Related Practice Questions
- Why is force considered a vector quantity?
- What is the difference between distance and displacement?
- What is the relationship between mass number and atomic number?
- What happens to water at $$0^\circ C$$ under normal atmospheric pressure?
- Which tissue forms the protective covering of the body?
Mini Quiz Challenge
1. Which of the following is a scalar quantity?
A) Force
B) Displacement
C) Distance
D) Velocity
Answer: Distance
2. The mass number of an atom is the sum of:
A) Protons and electrons
B) Electrons and neutrons
C) Protons and neutrons
D) Only neutrons
Answer: Protons and neutrons
3. At what temperature does pure water freeze under normal atmospheric pressure?
A) $$0^\circ C$$
B) $$50^\circ C$$
C) $$100^\circ C$$
D) $$-10^\circ C$$
Answer: $$0^\circ C$$
Exam Tips
✔ Remember that force has both magnitude and direction.
✔ Do not confuse distance with displacement.
✔ Mass number includes protons and neutrons, not electrons.
✔ Epithelial tissue provides covering and protection.
✔ The freezing point of pure water is $$0^\circ C$$ under normal atmospheric pressure.
Quick Revision Notes
✔ Force → Vector quantity
✔ Epithelial tissue → Protection and covering
✔ Distance → Scalar quantity
✔ Mass number → Protons + neutrons
✔ Water freezing point → $$0^\circ C$$
✔ Water boiling point → $$100^\circ C$$
Common Mistakes Students Make
❌ Confusing force with a scalar quantity.
❌ Treating distance and displacement as the same quantity.
❌ Including electrons while calculating mass number.
❌ Forgetting that epithelial tissue provides protection and lining.
❌ Confusing the freezing point of water with its boiling point.
Key Takeaways
- Force is a vector quantity.
- Epithelial tissue mainly provides protection and forms coverings and linings.
- Distance is a scalar quantity.
- Mass number is the sum of protons and neutrons.
- Pure water freezes at $$0^\circ C$$ under normal atmospheric pressure.
FAQs
1. Why is force a vector quantity?
Because force has both magnitude and direction.
2. Is distance a scalar or vector quantity?
Distance is a scalar quantity.
3. What is the formula for mass number?
$$\text{Mass Number}=\text{Protons}+\text{Neutrons}$$
4. What is the main function of epithelial tissue?
It provides protection, covering, and lining to different parts of the body.
5. What is the freezing point of water?
Pure water freezes at $$0^\circ C$$ under normal atmospheric pressure.
Conclusion
This Class 9 Science MCQ practice set revises important concepts related to force, tissues, physical quantities, atomic structure, and changes of state. Regular practice of such concept-based questions can improve students’ understanding and help them approach Science examinations with greater confidence.
NCERT Reference
Reference: NCERT Class 9 Science textbook and NCERT-aligned Class 9 Science concepts.
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