CBSE Class 9 - Physics - Work (Questions and Answers)
Q1: 2 Newton-metre is how many joules?
Answer: ∵ 1 Nm = 1J ∴ 2Nm = 2J
Q2: In the CGS system, what is the unit for Work?
Answer: erg
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Q1: 2 Newton-metre is how many joules?
Answer: ∵ 1 Nm = 1J ∴ 2Nm = 2J
Q2: In the CGS system, what is the unit for Work?
Answer: erg
Q1. Rusting of an article made up of iron is called
(a) corrosion and it is a physical as well as chemical change
(b) dissolution and it is a physical change
(c) corrosion and it is a chemical change
(d) dissolution and it is a chemical change
No. | Discovery | Scientist | Year |
---|---|---|---|
1. | Proton | Rutherford | 1919 |
2. | Neutron | James Chadwick | 1932 |
3. | Atom | John Dalton | 1808 |
4. | Atomic Structure | Neil Bohr & Rutherford | 1913 |
5. | Radioactivity | Henry Becquerel | 1896 |
6. | Radium | Madam Curie | 1898 |
7. | Raman Effect | CV. Raman | 1928 |
8. | X-Rays | Roentgen | 1895 |
9. | Photoelectric effect | Albert Einstein | 1905 |
10. | Periodic table | Mendeleev | 1888 |
11. | Nuclear Reactor | Anrico Fermi | 1942 |
12. | Wireless Telegram | Marconi | 1901 |
13. | Dynamite | Alfred Nobel | 1867 |