PART–3 : Objective Type Questions & Answers
This section contains MCQs, Very Short Answer Questions, and Assertion–Reason questions. These are important for Intermediate objective exams and IIT–JEE screening.
A. Multiple Choice Questions (MCQs)
1. Newton’s First Law of Motion is also known as:
A) Law of Force
B) Law of Acceleration
C) Law of Inertia
D) Law of Momentum
Answer: C) Law of Inertia
2. A body moving with constant velocity has:
A) Zero force and zero acceleration
B) Non-zero force and zero acceleration
C) Zero force and non-zero acceleration
D) Non-zero force and non-zero acceleration
Answer: A) Zero force and zero acceleration
3. Which of the following quantities is a vector?
A) Speed
B) Mass
C) Momentum
D) Time
Answer: C) Momentum
4. If the net force acting on a body is zero, then the body:
A) Must be at rest
B) Must be moving with constant velocity
C) May be at rest or moving with constant velocity
D) Must be accelerating
Answer: C) May be at rest or moving with constant velocity
5. The SI unit of force is:
A) dyne
B) newton
C) joule
D) watt
Answer: B) newton
B. Very Short Answer Questions
6. Define force.
Answer: Force is an interaction which can change the state of rest, state of motion, or shape of a body.
7. What is inertia?
Answer: Inertia is the tendency of a body to resist any change in its state of rest or uniform motion.
8. Write the mathematical form of Newton’s Second Law.
Answer: F = ma
9. What is the SI unit of momentum?
Answer: kg m s−1
10. On what does inertia depend?
Answer: Inertia depends on the mass of the body.
C. Assertion–Reason Questions
11. Assertion (A): A body can move with constant velocity without any force acting on it.
Reason (R): Force is required only to change the state of motion.
A) Both A and R are true and R is the correct explanation of A
B) Both A and R are true but R is not the correct explanation of A
C) A is true but R is false
D) A is false but R is true
Answer: A
12. Assertion (A): Action and reaction forces cancel each other.
Reason (R): Action and reaction forces act on the same body.
A) Both A and R are true
B) Both A and R are false
C) A is true but R is false
D) A is false but R is true
Answer: B
13. Assertion (A): A heavier body has greater inertia.
Reason (R): Inertia is proportional to mass.
A) Both A and R are true and R is the correct explanation of A
B) Both A and R are true but R is not the correct explanation of A
C) A is true but R is false
D) A is false but R is true
Answer: A
D. Competitive Exam Tips
- If acceleration is zero, net force must be zero.
- Force is related to acceleration, not velocity.
- Action and reaction never cancel because they act on different bodies.
- Always think in terms of forces and acceleration.
PART–3 Completed.
Objective understanding is now strong and exam-ready.
📚 Physics Thinking Library – How IIT Toppers Think
Welcome to the Physics Thinking Library by Mind Grow Magazine. This library is specially designed for IIT–JEE & Intermediate students to understand how toppers think, decide, and solve Physics problems.
🎯 What You Will Learn From This Library
- How IIT toppers approach Physics questions
- Decision-making during problem solving
- Common traps & how to avoid them
- Exam-hall mindset and logic flow
- Step-by-step thinking framework
📘 Complete Series: How IIT Toppers Think (Part 1–25)
Click on any part below to start learning. It is recommended to read in order.
- Part 1 – Introduction to Topper Thinking
- Part 2 – Understanding the Problem Statement
- Part 3 – Visualization & Physical Sense
- Part 4 – Role of Acceleration & Forces
- Part 5 – Free Body Diagram Thinking
- Part 6 – Method Selection Strategy
- Part 7 – Avoiding Formula Traps
- Part 8 – System Approach Mindset
- Part 9 – Friction & Constraint Thinking
- Part 10 – Time vs Accuracy Balance
- Part 11 – Common Thinking Mistakes
- Part 12 – Decision Flow in Tough Problems
- Part 13 – Eliminating Wrong Options
- Part 14 – Handling Multi-Concept Questions
- Part 15 – Pressure Handling in Exam Hall
- Part 16 – Speed Building Without Guessing
- Part 17 – Extreme Case Thinking
- Part 18 – Logical Shortcuts vs Blind Tricks
- Part 19 – Advanced Reasoning Techniques
- Part 20 – Rank-Deciding Thought Patterns
- Part 21 – Physics Intuition Development
- Part 22 – Eliminating Panic in Tough Questions
- Part 23 – Last-Minute Thinking Strategy
- Part 24 – Mistake-Proof Problem Solving
- Part 25 – Final Topper Framework
🧠 How to Use This Library Effectively
- Read 1–2 parts daily
- Apply thinking to real Physics problems
- Revisit library before exams
- Use as a mindset guide, not memorization
This library is a long-term asset for serious Physics learners.
© Mind Grow Magazine
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