Selected Questions and answers for preparing Kerala PSC Junior Assistant, Lower Division Clerk-2013 and other Competitive Examinations.
1. The Periodic Table arranges the elements in the order of?
Answer: Atomic Number
2. Soap is prepared by boiling Caustic soda with?
Answer: Fats
3. Heavy water is?
Answer: Deuterium oxide (D2O)
4. Which is called ‘Rock Cotton’?
Answer: Asbestos
5. Which is called ‘Black Diamond’?
Answer: Coal
6. Which is called ‘Brown Coal’?
Answer: Lignite
7. Metals extract from sea water?
Answer: Sodium and Magnesium
8. Which is known as ‘Metal of Future’?
Answer: Titanium
9. Electron was discovered by?
Answer: J.J Thomson
10. ‘Freon’ used as refrigerant is chemically known as?
Answer: Fluorinated Hydrocarbon
11. Paper is chemically?
Answer: Cellulose
12. Plumbism is a disease caused by?
Answer: Lead
13. Ethai ethai is a disease caused by?
Answer: Cadmium
14. Minamata is a disease caused by?
Answer: Mercury
15. Which gas is evolved when a metal react with acid?
Answer: Hydrogen
16. Mercury can best be purified by?
Answer: Vacuum Distillation
17. Hardest substance in Earth is?
Answer: Diamond
18. Calgon is:
Answer: Sodium Hexametaphosphate
19. Carbon content in the steel?
Answer: 0.02 to 2.1%
20. The Chemical name of Teflon?
Answer: Polytetra Fluoroethylene
21. Impurity present in Ore is:
Answer: Gangue
22. The Atomic number was first calculated by?
Answer: H.G.J Moseley
23. Simplest Hydrocarbon?
Answer: Methane
24. Zinc is extracted by the method?
Answer: Electrolysis
25. Who coined the name Oxygen?
Answer: Lavoisier
26. The particle having major role in bending the Nucleus?
Answer: Meson
27. Substance harms to human due to smoking?
Answer: Nicotine
28. The element has Atomic number 2?
Answer: Helium
29. The gas helps to ripen fruits?
Answer: Ethylene
30. Which metal has the density less than that of water?
Answer: Sodium
1 Comments
30. Which metal has the density less than that of water?
ReplyDeleteAnswer given is Sodium
but-
lithium, which has a density of 0.534 g/cm3
Potassium has a density of 0.862 g/cm3
while sodium has a density of 0.971 g/cm3