1.Atomic number of hydrogen is 1.
2.Atomic number of oxygen is 8.
3.Lactometer is used to measure density of milk.
4.Barometer is used to measure atmospheric pressure.
5.LASER is an acronym of Light Amplification by Stimulated Emission of Radiation.
6. Branch of Zoology which deals with the insects is called Entomology.
7. Water soluble vitamin is c.
8.Pure crystalline form of carbon is Diamond.
9.Torr is unit of atmosphere.
10.Ohm is unit of resistance.
11. Glycogen is an example of carbohydrates.
12. A Mammal which can fly is Bat.
13. Branch of physics deals with light is called photometry.
14.Jet engine was invented by Frank Whittle.
15. Marconi invented Radio.
16. Unit of frequency is Hertz.
17.Coulomb is unit of Electrical Charge.
18.Oxygen and Argon gases are used in electric bulb.
19.ROM ( Read only memory).
20.RAM (Random Access Memory).