NCERT Solutions for Class 11 Physics Chapter 1 Physical World

Ans : The physical world is highly complex. It has vast orders of magnitude in respect of mass, length and time. Even then all the physical phenomena can be explained in terms of few basic principles of physics. That is, it is possible to comprehend nature in terms of few basic laws in spite of its vast complexities. This is what Einstein meant to say. 

Ans : Any opinion against the conventional belief is a heresy, while dogma is an established belief. The geocentric theory of Copernicus started as a heresy but it ended as dogma when his theory was explained by Tycha Brahe and Jahnes Kepler later on. 

Ans : In politics, everything is possible. The politicians do not follow any principle, discipline or norm. They tend to remain in power by any means, fair or foul. gut a scientist observes a phenomenon carefully and patiently, collects data, analyses it and formulates principles, thus solving the mystery of nature. 

Ans : There are many factors which have hindered the advancement of science in India. Some of these are: 
1.There is lack of clear cut policies at the political level. There is undue political interference and bureaucratisation in the management of science and technology.
2. Due to excessive population, our country cannot afford to expend sufficient funds on science and technology 
3. Talented scientists and technologists are not encouraged to pursue research work in the homeland. Instead, they prefer to migrate to developed countries' where they get better salaries and research facilities. 
4. There is lack of coordination between researchers and industraliasts. Industrialists like to borrow 

Ans : Many phenomena which are based on the assumption of existence of atoms have been theoretically predicted and experimentally verified. These phenomena indirectly establish the existence of atoms. gut no such phenomenon has been observed which proves the existence of ghosts or which can be explained on the assumption of ehosts.