Understanding Physics
Understanding Physics: Overview
This topic covers concepts, such as, Physics, Meaning of Science, Macroscopic Quantity, Scientific Method and Theory & Unification and Reductionism etc.
Important Questions on Understanding Physics
Assertion : In physics, we attempt to derive the properties of a bigger, more complex system from the properties and interactions of its constituent simpler parts.
Reason : This approach is called unification and is at the heart of physics.
Which of the following is macroscopic quantity?
A glass of water, a coin, and a rubber band are examples of _____ quantity.
The branch of physics which deals with the motion of an object without or with the reference of force is_____.
The main branches of science are- physical science,earth science and life science.
The meaning of science is defined as_____.
Unification is a trial to correlate and unite various universal laws and basic phenomena of nature to explain an activity.
The process of breaking a complex system of the equations into simpler parts is _____
What is unification and Reductionism?
What are the two principal thrusts in physics?
Relate the technology with the scientific principle:
| Technology | Scientific principle |
| 1. Steam engine | A- Propagation of e.m wave |
| 2. Nuclear reactor | B- Newtons law of motion |
| 3. Radio and TV | C- superconductivity |
|
4. Computers |
D- Role of DNA in heredity |
| 5. Lasers | E- Thermodynamics |
| 6. Ultra-high magnetic fields | F- Faraday law of induction |
| 7. Rocket propulsion | G- Conversion of gravitational potential energy into electrical energy |
| 8. Genetic engineering | H- Motion of charge particle into an electric field |
| 9. Electric generators | I- Fission of uranium by slow neutrons |
| 10. Hydroelectric power | J- Amplification by population inversion |
| 11. Aeroplanes | K- Digital logic of the electronic circuit |
| 12. Particle accelerator | L- Bernoulli's principle in fluid dynamic |
| 13. Photocell | M- Thin-film optical interference |
| 14. Electron microscope | N- Reflection of ultrasonic waves |
| 15. Non-reflecting coating | O- Total internal reflection in light |
| 16. Optical fibre | P- Photoelectric effect |
| 17. Sonar | Q- Wave nature of electron |
Match the scientist with contribution/ discovery
| Scientist | Contribution/ discovery |
| (i) Faraday | (a) Law of gravitation |
| (ii) Rutherford | (b) Quantum model of hydrogen |
| (iii) Chadwick | (c) Unification of light and electromagnetism |
| (iv) Bohr | (d) Theory of relativity, explanation of photoelectric effect |
| (v) Newton | (e) x-rays |
| (vi) Maxwell | (f) Unification of weak and electromagnetic interaction |
| (vii) Salaam | (g) Law of electromagnetic induction |
| (viii) Einstein | (h) Expansion of universe |
| (ix) Roentgen | (i) Neutron |
| (x) Madam Curie | (j) Nuclear model of atom |
| (xi) J.J. Thomson | (k) Wave nature of light |
| (xii) de Broglie | (l) Transistor |
| (xiii) John Bardeen | (m) Electron |
| (xiv) Hubble | (n) Discovery of radium |
Name that branch of science which deals with the study of Earth.
What is scientific method? Write down its different steps.
The systematic knowledge collected through observation of nature is called _____.
