Class 9 Physics Chapter 9 The Nature of Science Notes – New Syllabus 2026

Physics is one of the most important branches of science that helps us understand how the natural world works. From the motion of planets in space to the use of electricity in our homes, physics explains many phenomena that we observe in our daily lives. In Class 9 Physics Chapter 9 – The Nature of Science, students learn how scientific knowledge is developed and how physicists study the universe using logical and systematic methods.

This chapter begins with the scope of physics, which explains the wide range of topics studied in physics and its importance in modern technology and everyday life. It also introduces the branches of physics, showing how the subject is divided into different fields to study various aspects of matter, energy, and motion.

Another important concept discussed in this chapter is the interdisciplinary nature of physics. Physics is closely connected with other sciences such as chemistry, biology, engineering, and environmental science. These connections help scientists develop new technologies and solve real-world problems.

Finally, the chapter explains the scientific method, a step-by-step process used by scientists to investigate questions and discover new knowledge. By understanding this method, students can learn how observations, experiments, and logical reasoning are used to reach scientific conclusions.

Class 9 Physics Chapter 9 MCQs – The Nature of Science

1. Physics is a branch of:

(a) Social science
(b) Life science
(c) Physical science ✅
(d) Biological science

2. Which branch of science plays a vital role in technology and engineering?

(a) Biology
(b) Chemistry
(c) Geology
(d) Physics ✅

3. The colour of a door is brown. It is an example of:

(a) Observation ✅
(b) Hypothesis
(c) Prediction
(d) Law

4. Physics deals with the study of:

(a) Only matter
(b) Only energy
(c) Matter, energy, space, time and their interactions ✅
(d) Only motion

5. The branch of physics related to visible light is called:

(a) Optics ✅
(b) Astronomy
(c) Acoustics
(d) Mechanics

6. The first step in the scientific method is:

(a) Experiment
(b) Observation ✅
(c) Theory
(d) Hypothesis

7. When a theory is tested many times and accepted as true, it becomes a:

(a) Model
(b) Prediction
(c) Observation
(d) Law ✅

Class 9 Physics Chapter 9 Short Questions – The Nature of Science

Q: State in your own words, what is science? Write its two main groups.

Answer:
Science is the knowledge we gain through observation, experimentation, and reasoning to understand natural and physical phenomena.

Its two main groups are:

1. Physical Sciences – e.g., Physics, Chemistry

2. Biological Sciences – e.g., Biology, Zoology