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Physical World Worksheet Physics Class 11
Physical World Worksheet
Notes you study before solving the worksheet.
1. What is science?
2. What is the origin of the word science?
3. What is meant by the Sanskrit word Shastra and the Arabic word Ilm?
4. What is the basic aim of science?
5. What is the difference between physical and biological sciences?
6. What is a scientific attitude?
7. What is a theory?
8. What is physics?
9. What is the origin of the word physics?
10. What are the two basic quests in physics?
11. Name the domain of physics that deals with phenomena intermediate between macroscopic and microscopic domains.
12. Physics has a very limited scope and is only the pastime of a few blessed ones. Is it true?
13. State one law that holds good in all natural processes.
Physical World Worksheet Physics Class 11
14. Some exciting and educative physical phenomena and experiences lead to the development of a theory. Give two such examples.
15. Name two Indian-born physicists who have been awarded Noble Prize in physics. [Chandigarh 02]
16. Name the scientist who replaced circular orbits with elliptical orbits in the heliocentric theory of the sun.
17. Name the scientist who discovered X-rays.
18. Who discovered electrons?
19. Name the scientist who first proposed the wave theory of light.
20. Name the famous scientist who discovered the law of gravitation.
21. Name the physicist who first proposed the nuclear model of the atom.
22. Who gave the quantum model of the hydrogen atom?
23. Name the scientists responsible for the development of Quantum Mechanics.
24. Name the physicist who first proposed the concept of antiparticle.
25. Which physicist first confirmed the existence of positrons experimentally?
26. Name the physicist who first measured the charge on an electron experimentally.
27. Name the physicist associated with wave-particle duality.
28. Who first discovered neutrons?
29. Name the scientist who received Nobel Prize twice in physics.
30. Name the physicist who first gave the exchange theory of nuclear forces.
31. Name the scientist who was first awarded two Nobel prizes.
32. What were the important contributions of Madame Marie Curie?
33. Who first discovered radioactivity?
34. Who first gave the theory of expanding the universe?
35. Mention some important contributions of Albert Einstein to physics.
36. Name the Indian physicist, who was first awarded the Nobel prize.
37. What was the important discovery of C.V. Raman?
38. What was the major contribution of Indian physicist S.N. Bose?
39. With which fieldwork was the famous Indian physicist H.J. Bhabha associated?
40. Name the Indian physicist associated with the triple helical structure of proteins.
41. Mention the major areas of modem scientific research in chemical and biological sciences that are bound to affect the human society of the twenty-first century.
42. On which scientific principle does an aeroplane work?
43. On which scientific principle calculators and computers are based?
44. Which technology of physics has triggered the computer revolution in the last three decades of the twentieth century?
45. What does the word LASER stand for? On what basic principle does it work?
46. Name the phenomenon used in the production of ultra-high magnetic fields.
47. Name the philosopher who said about science “we know very little yet it is astonishing that we know so much and still astonishing that so little knowledge (of science) can give us so much power”.
48. Name the four fundamental forces in nature.
49. Name the force responsible for the stability of nuclei and having a range of 10-15m.
[Central Schools 13]
50. Arrange the weak-nuclear force, the electromagnetic force, and gravitational force in the decreasing order of the strengths.
51. Give the ratio of the strengths of the four fundamental forces in nature.
52. What is the nature of the intermolecular Van der Walls’ forces?
53. How many times is the strong nuclear force stronger than the electromagnetic force?
54. Is strong nuclear force a true fundamental force?
55. Which force mainly governs the structure of atoms and molecules?
56. Which fundamental force governs the large-scale motion in the universe?
57. What is meant by charge independent character of strong nuclear force?
58. Which class of elementary particles experiences the weak nuclear force and not the strong nuclear force?
59. Among which type of elementary particles does the electromagnetic force act?
60. Name the class of elementary particles on which strong nuclear force acts.
61. Which particle initiates the electromagnetic force between two electrons?
62. What are the exchange particles for the operation of (i) strong nuclear force and (ii) weak nuclear force?
63. How much is the range of gravitational force? What are the messenger particles for this force?
64. Name the physicists who first unified the electric and magnetic phenomena.
65. Name the unified domain of weak nuclear force and electromagnetic force.
66. Name the physicists who first predicted the existence of electro-weak force.
67. What are the conserved quantities in nature? Give two examples of such quantities.
68. State the law of conservation of momentum. From which symmetry principle is this law obtained?