NCERT Solutions for Class 11 Physics Chapter 1 – Physical World

NCERT Solutions for Class 11 Physics Chapter 1 are the best way to learn and revise the chapter.  Chapter 1 of Class 11 Physics provides a lot of insights towards the subject and its uses too many other related topics. Though it is the first chapter, it is extremely essential to clear your base in this chapter as it will help you in CBSE exams and competitive exams of Engineering and Medical courses. So, to clear your basics in the fundamental level of Physics, you will need to refer to NCERT Solutions respectively.

NCERT Class 11 Physics Chapter 1 includes 16 questions. The main topics of the chapter include the scope of physics, the role of physics in technology and society, fundamental forces in nature and physical laws.  Physics, no doubt, can be daunting for so many of you in Class 11.

With the help of our NCERT Solutions, you can understand this chapter thoroughly and begin with a strong base. Our experts have drafted the NCERT Solutions for Class 11 Chapter 1 – Physical World in the simplest way possible for your better understanding. It is advised that you add these solutions to your every study schedule for a better experience in the subject.

Important Topics for NCERT Solutions for Class 11 Chapter 1 – Physical World

NCERT Solutions for Class 11 Physics Chapter 1 covers the following topics: Science and Its Origin. Natural Science. Physics, Scope of Physics, Macroscopic and Microscopic Domain, Factors Responsible for Progress of Physics, Technological Applications of Physics, Fundamental Forces in Nature, Conserved Quantities and Conservation Laws. The definitions and essential pointers of each of the above-mentioned topics are covered elaborately and simply in this chapter. 

Science and Its Origin:

  • The word science originates from the Latin verb “Scientia” meaning “to know”. 
  • Science is a systematic method to learn a certain phenomenon in the most detailed and comprehensive manner and by using it to gain knowledge to predict, modify and control that particular phenomenon. 
  • The scientific method of unravelling the beauty of science includes various methods, including the following: 
  1. Systematic Observations. 
  2. Controlled Experiments. 
  3. Qualitative and Quantitative Reasoning. 
  4. Mathematical Modelling. 
  5. Prediction. 
  6. Verification or Falsification of Theories. 
  • Science is not absolute or constant, and so does it lack a final theory. 

Each day is a new opportunity with new theories in Science. For example, Johannes Kepler (1571-1630) examined Tycho Brahe’s (1546-1601) research paper on planetary movements to improve Nicolas Copernicus (1473-1540) theory.

Natural Sciences:

Natural Science is a branch of Science which has all the other disciplinary sciences: Physics, Chemistry and Biology. It is the science that deals with predicting, modifying and controlling a certain phenomenon. 


It is the branch of Natural Sciences. The word Physics comes from a Greek word meaning Nature. A precise definition of this subject or discipline is neither possible nor necessary. We can extensively describe Physics as a study of the basic laws of nature and their manifestation in the different natural phenomena.

Important Points to Remember: There are two principal thrusts in Physics – Unification (to unify the fundamental forces of nature) and Reduction (to derive something more complex and vast from its simplest parts). 

Scope of Physics:

Physics can be classified into two types based on its scope: Classical Physics and Modern Physics

Classical Physics deals with the Macroscopic aspects of Physics which includes phenomena in the Laboratories, terrestrial and astronomical scales etc. It also includes the study of subjects like Mechanics, Electrodynamics, Optics and Thermodynamics.

Modern Physics deals with the Microscopic aspects of Physics which includes atomic, molecular and nuclear phenomena. The microscopic domain of Physics deals with the fundamental and structure of matter at a minute or a much lower scale of the atoms and nuclei and their interactions with different probes such as electrons, photons and other elementary particles. 

Factors Responsible for the Progress of Physics:

  1. Qualitative analysis of some aspects of Physics along with the quantitative analysis. More precision is being observed. 
  2. The fundamental and universal laws of Physics is being used in different contexts and the different areas nowadays. 
  3. A complex phenomenon is being broken down into a hoard of basic laws or a basic approximation method has been developed over the years. 
  4. Extraction of the essential features of a phenomenon is being carried out and has been getting more focus.

Technological Applications of Physics:

Physics and its concepts have led to some of the major and minor discoveries in the 21st century. It is innumerable to think about the amount of work that has been done under Physics. Some examples where Physics has done wonders and have led the discoveries or inventions are as follows:

  • The steam engine which was a very popular discovery in the Industrial Revolution in England was developed in the 19th century. 
  • Sometimes, Physics gives rise to new technology rather. For instance, the development of Wireless Communication Technology that followed the basic laws of electricity and magnetism. 
  • In 1938, Hahn and Meitner discovered the phenomenon of neutron-induced fission of Uranium that led to the development of Nuclear Power Reactors and Weapons. 
  • Conversion of Solar Energy, Wind Energy and Geothermal Energy into Electricity is another great discovery using the basic laws of Physics.

Fundamental Forces of Nature:

The forces which we see in our day to day lives are the Macroscopic aspects of fundamental forces of nature under Physics. 

These forces include Muscular, Friction, Forces due to Compression and Elongation of Springs and Strings, Fluid and Gas Pressure, Electric, Magnetic, Interatomic and Intermolecular Forces. These are also known as the Derived Forces.

A few fundamental forces are:

Gravitational Force: Force of mutual attraction between any two objects by virtue of their masses. 

Electromagnetic Force: Force observed between the charged particles.

Strong Nuclear Force: The attractive force seen between the protons and the neutrons in a nucleus.

Weak Nuclear Force: Force observed only when Nuclear processes such as beta-decay of a nucleus.

Conserved Quantities:

Physics is the science of multiple possibilities. It gives laws that verify a certain phenomenon and its observations and investigations occurring in the universe.

  • Physical quantities that remain constant with time despite being added to it are known as conserved quantities. 
  • Conserved quantities can have a Scalar Quantity (related to Energy) or a Vector Quantity (total linear and angular momentum). 

Conserved Laws:

These laws are hypothetical, which could not be answered by observations and experiments. They can be only verified through the experiments. The laws are:

  1. a) Law of Conservation of Energy
  2. b) Law of Conservation of Mass
  3. c) Law of Conservation of Linear Momentum
  4. d) Law of Conservation of Angular Momentum

Exercise Discussion for NCERT Solutions for Class 11 Physics Chapter 1

  • Although not many questions are asked from this chapter in CBSE exams one must solve all the NCERT questions related to the chapter for a better understanding of physics concepts. 
  • All the questions related to the chapter are objective-type questions. NCERT has clearly mentioned that these are not meant for exam purposes. 
  • All the questions are related to general science and day to day topics related to science on topics like electrons, science and technology in the 21st century, industrial revolution, and science textbooks etc.

Benefits of NCERT Solutions for Class 11 Physics Chapter 1 by Instasolv

If you are looking for physics solutions regarding the Chapter 1 – Physical World that can allow you to improve your percentile in class, then NCERT Solutions for Class 11 Physics Chapter 1 are the best choice for you. All concepts of the chapter are well-explained giving you enough scope to solve the exercises accurately. As most of the questions are based on your basic understanding of science, we have created simple answers that are easy to understand for you.