Class 11 Physics Important Chapter 1 Physical World

Class 11 Physics Important Chapter 1 Physical World Solutions English Medium As Per AHSEC New Syllabus to each chapter is provided in the list so that you can easily browse through different chapters NCERT Class 11 Physics Important Solutions and select need one. AHSEC Class 11 Physics Additional Notes English Medium Download PDF. HS 1st Year Physics Important Solutions in English.

Class 11 Physics Important Chapter 1 Physical World

Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. NCERT Class 11 Physics Additional Question Answer are part of All Subject Solutions. Here we have given HS 1st Year Physics Important Notes in English for All Chapters, You can practice these here.

Physical World

Chapter: 1

IMPORTANT QUESTION AND ANSWER

Answer the Following Questions:

1. Name five Indian physicists who have made significant contributions in the field of physics?

Ans. C.V. Raman, S. N. Bose, S. Chander Sekhar, Homi J. Bhabha and Meghnad Shah.

2. What are the five main branches of physics?

Ans. Mechanics, Electromagnetism, Heat and Thermodynamics, Quantum Mechanics and Theory of Relativity.

3. Who discovered X-ray, neutron, electron, cosmic radiation, thermal ionization and cyclotron?

Ans. X-ray-W.K. Roentzen. Neutron-James Chadwick Electron-J.J. Thomson Cosmic radiation-Victor Francis Hess Thermal ionization-M.N. Saha Cyclotron-E.O. Lawrence.

4. Who proposed the wave theory of light?

Ans. Christian Huygens.

5. What are the various interconnected steps in scientific method?

Ans. (a) Observation, (b) Identification, (c) Analysis, (d) Conclusion and (e) Application.

6. What is physics?

Ans: Study of basic laws of nature and their manifestation.

7. Define reductionism.

Ans: Studying complex systems by analyzing their simpler parts.

8. Name the four fundamental forces in nature.

Ans: Gravitational, Electromagnetic, Strong Nuclear, Weak Nuclear.

9. What is unification in physics?

Ans: Explaining diverse phenomena using universal laws.

10. Name two domains of interest in physics.

Ans: Macroscopic and Microscopic domains.

11. Who proposed the quantum model of the hydrogen atom?

Ans: Niels Bohr.

12. What does conservation of energy mean?

Ans: Total energy remains constant in an isolated system.

13. What is the range of strong nuclear force?

Ans: About 10^-15 meters.

14. What is the importance of symmetry in physics?

Ans: It leads to conservation laws like energy and momentum.

15. Explain the role of physics in technology and society.

Ans: Physics has led to technological innovations like power plants, communication, and medical devices. Thermodynamics led to engines, electromagnetism led to wireless communication, and quantum mechanics to lasers and electronics.