Chapter-1: Introduction to Physics

 

Detailed Solutions HC Verma Vol-1 Chapter-1: Introduction to Physics (Step-by-Step Explanation)

HC Verma’s Concepts of Physics Vol-1 is a classic textbook for students aiming to master Physics fundamentals for JEE, NEET, and other competitive exams. The first chapter, “Introduction to Physics,” sets the stage for everything that follows. Though the chapter may appear simple at first glance, the questions are thoughtfully designed to introduce logical reasoning, basic calculations, and a physics-oriented mindset. In this post, we provide detailed step-by-step solutions to all the questions from Chapter 1 to help you develop a solid conceptual base.

Overview of Chapter 1: Introduction to Physics

This chapter introduces what Physics is, its scope, and how it connects with other disciplines. It explains the importance of measurements, the need for standard units, dimensional analysis, and the role of approximations and estimations. The problems in this chapter are not numerically intense but focus on logical reasoning, estimation skills, and unit analysis, which are essential tools in any physicist's toolkit.

Types of Questions in Chapter 1

1. Objective Type Questions – Type I (Single Correct Answer)

2. Objective Type Questions – Type II (More than One Correct)

3. Short Answer Questions

4. Long Answer/Descriptive Questions

5. Numerical Problems

Step-by-Step Explanation of Objective Questions

In Objective Type Questions, you are expected to choose the correct option(s). Each question has been solved by:

• Identifying what the question is testing — dimensional consistency, units, physical meaning, or logic.

• Writing the relevant dimensional formula or conversion factor.

• Using logical reasoning or known values to eliminate incorrect choices.

Example:
“Which of the following is not a fundamental quantity?”
Solution:
List of fundamental quantities: Length, Mass, Time, Electric Current, Temperature, Amount of Substance, and Luminous Intensity.
Hence, any option outside of these (e.g., velocity or force) is not fundamental.

Detailed Solutions to Short Answer Questions

Short answer questions typically test understanding of core concepts like why approximations are used or how physics connects with mathematics. Each answer is written:

• In concise scientific language.

• With diagrams where required.

• Referring back to real-world analogies makes learning intuitive.

Example:
“Why are approximations acceptable in physics?”
Answer:
Physics models real-world phenomena. In real life, perfect measurements are impossible. Approximations help simplify complex systems while still providing accurate-enough results for practical use — such as ignoring air resistance when calculating free fall in ideal conditions.

Step-by-Step Numerical Problem Solutions

Even though Chapter 1 has only a few numerical problems, they are foundational for understanding how to:

• Use proper units (SI system)

• Convert between different unit systems

• Apply dimensional analysis

• Estimate quantities

Each problem is broken down step-by-step:

1. Write down the given data.

2. Convert units if needed.

3. Apply the relevant formula.

4. Solve mathematically, showing each step.

5. Round the answer according to significant figures.

Example:
Estimate the number of air molecules in a room of size 5 m × 4 m × 3 m at room temperature.
Solution Outline:

• Calculate the volume of the room

• Use the ideal gas equation or known estimation: 1 mole of gas occupies 22.4 liters at STP

• Approximate the air density and derive the number of molecules using Avogadro’s number

Why Use Step-by-Step HC Verma Solutions?

Students often skip foundational chapters, but Chapter 1 is crucial for setting your mindset for future physics learning. By following step-by-step solutions:

• You improve your analytical and problem-solving skills.

• You learn how to approach physics questions logically.

• You master the art of approximation and dimensional reasoning early on.

Find the Solutions of All Questions Asked in HC Verma Vol-1 Chapter-1: Introduction to Physics