NCERT Solutions for Class 11 Physics Chapter 1 Physical World

 

NCERT Solutions for Class 11 Physics Chapter 1 Physical World: This is the introductory chapter of NCERT class 11 physics. The solutions of NCERT class 11 physics chapter 1 physical world gives an explanation to questions related to the general introduction to science and physics. Certain important inventions are mentioned in the chapter with the name of invented Scientist. You can go through it for your general awareness. CBSE NCERT solutions for class 11 physics chapter 1 physical world gives a brief idea about how important is physics in our daily life. NCERT solutions for class 11 physics chapter 1 the physical world will be helpful to improve general awareness and for some competitive exams conducted by UPSC and state government. NCERT solutions are an important tool for the preparations of CBSE board exams.

 Technology and scientific principle:

Technology

Scientific principle(s)

Steam engine

Laws of thermodynamics

Nuclear reactor

Controlled nuclear fission

Radio and Television

Generation, propagation and

detection of electromagnetic waves

Computers

Digital logic

Lasers

Light amplification by

stimulated emission of radiation

Production of ultra high

magnetic fields

Superconductivity

Rocket propulsion

Newton’s laws of motion

Electric generator

Faraday’s laws of

electromagnetic induction

Hydroelectric power

Conversion of gravitational potential

energy into electrical energy

Aeroplane

Bernoulli’s principle in fluid dynamics

Particle accelerators

The motion of charged particles

in electromagnetic fields

Sonar

Reflection of ultrasonic waves

Optical fibres

Total internal reflection of light

Non-reflecting coatings

Thin-film optical interference

Electron microscope

Wave nature of electrons

Photocell

Photoelectric effect

Fusion test reactor (Tokamak)

Magnetic confinement of plasma

Giant Metrewave Radio

Telescope (GMRT)

Detection of cosmic radio waves

Bose-Einstein condensate

Trapping and cooling of atoms by

laser beams and magnetic fields.

 
 

Topics covered in the NCERT solutions for class 11 physics chapter 1 physical world:

1.1 What is physics?

1.2 Scope and excitement of physics

1.3 Physics, technology and society

1.4 Fundamental forces in nature

1.5 Nature of physical laws

NCERT solutions for class 11 physics chapter 1 physical world exercise:

Q1.1 Some of the most profound statements on the nature of science have come from Albert Einstein, one of the greatest scientists of all time. What do you think did Einstein mean when he said: “The most incomprehensible thing about the world is that it is comprehensible”?

Answer:

Einstein meant to say that the all the physical phenomenon can be explained by the very basic laws of physics i.e., it is possible to simplify world with basic laws of physics (as the world is very complex).

Q1.2  “Every great physical theory starts as a heresy and ends as a dogma”. Give some examples from the history of the science of the validity of this incisive remark.

Answer:

The opinions which are against the conventions are called HERESY, whereas some established theory is known as DOGMA.

For e.g.  Copernicus’s geocentric theory was a heresy till the times it was proved became a Dogma.

Q1.3 “Politics is the art of the possible”. Similarly, “Science is the art of the soluble”. Explain this beautiful aphorism on the nature and practice of science.

Answer:

This statement means politics give you possibility or power to do something good for the society as people elect to represent them. Similarly, a scientist gives times to study particular phenomena and studies that carefully, explain it to the whole world and after discovery is confirmed they present it to the whole world as a better product for the world.

Q1.4 Though India now has a large base in science and technology, which is fast expanding, it is still a long way from realising its potential of becoming a world leader in science. Name some important factors, which in your view have hindered the advancement of science in India.

Answer:

(i) Due to political interference in the educating system of society.

(ii) Due to the large population, the resources or the quality of education is low.

(iii) The policies for higher studies is not good in India so no one is interested in research.

Q1.5  No physicist has ever “seen” an electron. Yet, all physicists believe in the existence of electrons. An intelligent but superstitious man advances this analogy to argue that ‘ghosts’ exist even though no one has ‘seen’ one. How will you refute his argument?

Answer:

This argument can be refused as the complete physics (theorems) depends upon the fact that the nucleus contains electrons. Whereas there is no advancement of human in agreeing with the existence of ghosts.

Q1.7 The industrial revolution in England and Western Europe more than two centuries ago was triggered by some key scientific and technological advances. What were these advances?

Answer:

Some of the advances were :

 (i) Steam engine:-  It revolutionised the complete transport system at that time.

(ii) Blast furnace:- The temperature required to melt the iron was now able to achieve using blast furnace.

(iii) Cotton Jenny:- It reduced the time for collecting cotton.

Q1.8 It is often said that the world is witnessing now a second industrial revolution, which will transform the society as radically as did the first. List some key contemporary areas of science and technology, which are responsible for this revolution.

Answer:

The major areas can be:-  

 (i) The availability of internet 

(ii)  supercomputers

(iii) Artificial intelligence

(iv) Data storage source for DNA. 

Q1.9 Write in about 1000 words a fiction piece based on your speculation on the science and technology of the twenty-second century.

Answer:

In today's world, we travel to places by means of aircraft fuelled by petrol but in the twenty-second century, we may see a journey to a distant star which is located hundreds of light-years away from the earth with the help of a spaceship (which is not bounded by fuel consumption).

Also, we might see the interference of aliens our colony on other planets. Then, there might be a war for existence between human and aliens.

Q1.10 Attempt to formulate your ‘moral’ views on the practice of science. Imagine yourself stumbling upon a discovery, which has great academic interest but is certain to have nothing but dangerous consequences for the human society. How, if at all, will you resolve your dilemma?

Answer:

Since we have progressed at a very high rate in recent time but we need to discover many other things in the universe (as the universe holds many secrets within itself).

Moreover, the person using the knowledge has only two options either construction or destruction it depends upon the thinking of one.

Q1.11 (b) Science, like any knowledge, can be put to good or bad use, depending on the user. Given below is an application of science. Formulate your views on whether the particular application is good, bad or something that cannot be so clearly categorised :

(b) Television for eradication of illiteracy and for mass communication of news and ideas.

Answer:

Television for the eradication of illiteracy and for mass communication of news and ideas will be good as in the modern few are left behind so we need to make them literate in one form or the other for a better society.

Q1.11 (c) Science, like any knowledge, can be put to good or bad use, depending on the user. Given below is an application of science. Formulate your views on whether the particular application is good, bad or something that cannot be so clearly categorised :

(c) Prenatal sex determination

Answer:

Prenatal sex determination cannot be good for society as the thinking of modern people is to give birth only to a male child. So this will create imbalance by creating gender inequality.

Q1.11 (d) Science, like any knowledge, can be put to good or bad use, depending on the user. Given below is an application of science. Formulate your views on whether the particular application is good, bad or something that cannot be so clearly categorised :

 (d) Computers for increase in work efficiency

Answer:

The computer can definitely decrease the human effort and increase efficiency so they are good progress in society. But it must be noticed that excessive use of a computer may lead to unemployment in the world.

Q1.11 (f) Science, like any knowledge, can be put to good or bad use, depending on the user. Given below is an application of science. Formulate your views on whether the particular application is good, bad or something that cannot be so clearly categorised :

(f ) Development of nuclear weapons

Answer:

Nuclear weapons are the most dangerous weapons in the current world as they may wipe off not only a country but they also have long term effects.

Thus nuclear elements should only be used for the generation of electricity.

Q1.11 (g) Science, like any knowledge, can be put to good or bad use, depending on the user. Given below is an application of science. Formulate your views on whether the particular application is good, bad or something that cannot be so clearly categorised :

(g) Development of new and powerful techniques of chemical and biological warfare).

Answer:

Development of new and powerful techniques of chemical and biological warfare is not good for society as it only has a bad effect on maintaining peace in the world. Further, they may also be used by terrorists which is harmful to safety for the citizens. 

Q1.11 (h) Science, like any knowledge, can be put to good or bad use, depending on the user. Given below is an application of science. Formulate your views on whether the particular application is good, bad or something that cannot be so clearly categorised :

(h) Purification of water for drinking

Answer:

Purification of water for drinking is very important for some of the regions as the people living there are having many water-related diseases. Also, the pure water is limited so we need to develop many techniques for purification of the water. 

Q1.13 Though the law gives women equal status in India, many people hold unscientific views on a woman’s innate nature, capacity and intelligence, and in practice give them a secondary status and role. Demolish this view using scientific arguments, and by quoting examples of great women in science and other spheres; and persuade yourself and others that, given equal opportunity, women are on par with men.

Answer:

There are many examples in the world which shows women are nowhere behind the men. For e.g.  Indira Gandhi,  Mother Teresa, Kalpana Chawla etc. have proved themselves in their respective field. There might be some biological differences between men and women but that doesn't make men superior, at least not in the modern world.

Q1.14  “It is more important to have beauty in the equations of physics than to have them agree with experiments”. The great British physicist P. A. M. Dirac held this view. Criticize this statement. Look out for some equations and results in this book which strike you as beautiful.

Answer:

There many equations that struck the physicist such as Newton's law of motion and the famous mass-energy equation of  Einstein which then became the path-breaking for the physics. Thus the given statement is true.

Q1.16 Textbooks on science may give you a wrong impression that studying science is dry and all too serious and that scientists are absent-minded introverts who never laugh or grin. This image of science and scientists is patently false. Scientists, like any other group of humans, have their share of humorists, and many have led their lives with a great sense of fun and adventure, even as they seriously pursued their scientific work. Two great physicists of this genre are Gamow and Feynman. You will enjoy reading their books listed in the Bibliography.

Answer:

Scientists as other human have hobbies and are humorists. For e.g, Albert Einstein had the hobby of playing the violin. So apart from doing their serious work on physics they also have fun in their lifestyle. Thus the image of science and scientists is patently false which states that science is tough and boring.

You may read a few of the books which supports the above statement and tell you about the lifestyle of some famous scientists.

NCERT solutions for class 11 physics chapter wise 

Chapter 1

NCERT solutions for class 11 physics chapter 1 Physical world

Chapter 2

Solutions of NCERT for class 11 physics chapter 2 Units and Measurement

Chapter 3

CBSE NCERT solutions for class 11 physics chapter 3 physics Motion in a straight line

Chapter 4

NCERT solutions for class 11 physics chapter 4 Motion in a Plane

Chapter 5

Solutions of NCERT for class 11 physics chapter 5 Laws of Motion

Chapter 6

CBSE NCERT solutions for class 11 physics chapter 6 Work, Energy and Power

Chapter 7

NCERT solutions for class 11 physics chapter 7 System of Particles and Rotational motion

Chapter 8

Solutions of NCERT for class 11 physics chapter 8 Gravitation

Chapter 9

CBSE NCERT solutions for class 11 physics chapter 9 Mechanical Properties of Solids

Chapter 10

NCERT solutions for class 11 physics chapter 10 Mechanical Properties of Fluids

Chapter 11

Solutions of NCERT for class 11 physics chapter 11 Thermal Properties of Matter

Chapter 12

CBSE NCERT solutions for class 11 physics chapter 12 Thermodynamics

Chapter 13

NCERT solutions for class 11 physics chapter 13 Kinetic Theory

Chapter 14

Solutions of NCERT for class 11 physics chapter 14 Oscillations

Chapter 15

CBSE NCERT solutions for class 11 physics chapter 15 Waves

Subject wise solutions for NCERT class 11

NCERT solutions for class 11 biology

CBSE NCERT solutions for class 11 maths

NCERT solutions for class 11 chemistry

Benefits of NCERT solutions for class 11 physics chapter 1 physical world:

The questions explained in the NCERT solutions are written briefly with some examples. NCERT solutions for class 11 physics chapter 1 physical world give a brief idea about physics technology and society. Most of the questions are general and students can answer it on their perspective.

 

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