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Practice Class 9 Science MCQ Questions with Answers based on the latest NCERT syllabus. Learn about uniform motion, phloem, plant cells, atomic mass unit (amu), and force 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:
- Motion
- The Fundamental Unit of Life
- Tissues
- Structure of the Atom
- Force and Laws of Motion
Question Type: Multiple Choice Questions (MCQs)
Difficulty Level: Easy to Moderate
Based On: Latest NCERT Syllabus
Introduction
Class 9 Science introduces students to important concepts from Physics, Chemistry, and Biology that explain the natural world. Topics such as motion, plant tissues, cell structure, atomic mass, and force form the foundation for advanced scientific learning. Practicing concept-based MCQs helps improve logical thinking, conceptual understanding, and examination performance.
What You Will Learn
✔ Meaning of uniform motion
✔ Function of phloem tissue
✔ Characteristics of plant cells
✔ Atomic mass unit (amu)
✔ Effects of force on an object
✔ Important NCERT concepts
Why This Topic Is Important?
These concepts help students understand how objects move, how plants transport food, how cells are structured, and how matter is measured. They are frequently asked in CBSE, State Board, Olympiad, and scholarship examinations and are essential for building a strong scientific foundation.
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. Uniform motion means:
A) Infinite speed
B) Changing speed
C) Constant speed
D) Zero speed
Answer
Constant speed
Concept Behind This Question
Uniform motion occurs when an object covers equal distances in equal intervals of time.
Useful Formula for This Question
$$\text{Speed}=\frac{\text{Distance}}{\text{Time}}$$
Step-by-Step Solution
If an object moves with the same speed throughout its journey, it is said to be in uniform motion.
In this type of motion:
- Equal distances are covered in equal intervals of time.
- The speed remains constant.
Therefore, the correct answer is: Constant speed.
Exam Tip
Remember:
Uniform Motion = Constant Speed
Q2. Phloem transports:
A) Minerals
B) Food
C) Oxygen
D) Water
Answer
Food
Concept Behind This Question
Plants have specialized tissues that transport water, minerals, and food.
Step-by-Step Solution
Phloem carries the food prepared in leaves during photosynthesis to all parts of the plant.
In contrast, xylem transports water and minerals from the roots to the upper parts of the plant.
Therefore, the correct answer is: Food.
Exam Tip
Remember:
- Xylem → Water and Minerals
- Phloem → Food
Q3. Cell wall is present in:
A) Humans
B) Plants
C) Animals
D) Bacteria only
Answer
Plants
Concept Behind This Question
The cell wall provides strength, protection, and support to plant cells.
Step-by-Step Solution
Plant cells have a rigid cell wall made mainly of cellulose.
Animal cells and human cells do not possess a cell wall.
Although bacteria also have cell walls, the most appropriate answer according to this question is Plants.
Therefore, the correct answer is: Plants.
Exam Tip
Remember:
- Plant Cell → Cell Wall Present
- Animal Cell → Cell Wall Absent
Q4. Atomic mass unit:
A) amu
B) kg
C) mole
D) gram
Answer
amu
Concept Behind This Question
Very small atomic masses are expressed using the atomic mass unit.
Step-by-Step Solution
The mass of atoms is extremely small, so scientists use the atomic mass unit (amu) instead of kilograms or grams.
One atomic mass unit is defined as one-twelfth of the mass of a carbon-12 atom.
Therefore, the correct answer is: amu.
Exam Tip
Remember:
Atomic Mass → amu
Mass of Objects → kg or g
Q5. Force can:
A) All of these
B) Stop motion
C) Start motion
D) Change direction
Answer
All of these
Concept Behind This Question
A force can produce different effects depending on how it acts on an object.
Step-by-Step Solution
A force can:
- Start the motion of a stationary object.
- Stop a moving object.
- Change the speed of an object.
- Change the direction of motion.
- Change the shape of an object in some situations.
Since all the listed effects are possible, the correct answer is All of these.
Therefore, the correct answer is: All of these.
Exam Tip
Remember:
A force can start, stop, speed up, slow down, or change the direction of motion.
Important Formulas & Concepts
1. Speed
$$\text{Speed}=\frac{\text{Distance}}{\text{Time}}$$
SI Unit:
metre per second (m/s)
2. Uniform Motion
An object is said to be in uniform motion if it covers equal distances in equal intervals of time.
3. Plant Transport Tissues
Xylem
- Transports water and minerals.
- Movement is mainly upward.
Phloem
- Transports prepared food.
- Food moves to different parts of the plant.
4. Cell Wall
- Present in plant cells.
- Made mainly of cellulose.
- Provides shape, support, and protection.
5. Atomic Mass Unit
Symbol: amu (or unified atomic mass unit, u)
Used to express the mass of atoms and subatomic particles.
6. Effects of Force
A force can:
- Start motion
- Stop motion
- Change speed
- Change direction
- Change shape
Related Practice Questions
- What is the difference between uniform and non-uniform motion?
- Which tissue transports water in plants?
- Name two functions of the cell wall.
- Why is the atomic mass unit used instead of kilograms?
- Give two real-life examples where force changes the direction of motion.
Mini Quiz Challenge
True or False
- Uniform motion means constant speed.
- Phloem transports water.
- Animal cells have a cell wall.
- Atomic masses are expressed in amu.
- Force can change the direction of motion.
Exam Tips
✔ Learn the definitions of uniform and non-uniform motion.
✔ Remember the functions of xylem and phloem.
✔ Compare plant cells and animal cells.
✔ Memorize important scientific units.
✔ Understand all the effects of force with everyday examples.
Quick Revision Notes
✔ Uniform motion means constant speed.
✔ Phloem transports food in plants.
✔ Plant cells contain a cell wall.
✔ Atomic mass is measured in amu.
✔ Force can start, stop, or change the motion of an object.
✔ Xylem transports water and minerals.
Common Mistakes Students Make
❌ Confusing speed with uniform motion.
❌ Mixing up the functions of xylem and phloem.
❌ Assuming animal cells also have a cell wall.
❌ Writing kilogram as the unit of atomic mass.
❌ Thinking force only starts motion and cannot stop or change it.
Key Takeaways
- Uniform motion occurs at a constant speed.
- Phloem distributes food throughout the plant.
- Plant cells have a protective cell wall.
- Atomic masses are expressed in atomic mass units (amu).
- Force can produce several effects, including changing the speed and direction of motion.
FAQs
1. What is uniform motion?
Uniform motion is the motion in which an object covers equal distances in equal intervals of time.
2. What is the function of phloem?
Phloem transports food prepared in the leaves to different parts of the plant.
3. Why do plant cells have a cell wall?
The cell wall provides strength, protection, and a definite shape to plant cells.
4. What is the unit of atomic mass?
The unit of atomic mass is atomic mass unit (amu).
5. What are the effects of force?
A force can start motion, stop motion, change speed, change direction, and sometimes change the shape of an object.
Conclusion
This Class 9 Science MCQ Practice Set covers essential NCERT concepts related to motion, plant transport tissues, cell structure, atomic mass, and force. Regular practice of these concept-based questions helps students improve conceptual understanding, strengthen scientific reasoning, and perform confidently in school examinations and competitive tests.
NCERT Reference
Book: NCERT Science Class 9
Relevant Chapters:
- Chapter 5: The Fundamental Unit of Life
- Chapter 6: Tissues
- Chapter 4: Structure of the Atom
- Chapter 8: Motion
- Chapter 9: Force and Laws of Motion
Based On: Latest NCERT Curriculum (CBSE)
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