Chemistry 5 (Previous years asked questions)

1. The ratio of pure gold in 18 carat gold is

     (a) 60%
     (b) 75%
     (c) 80%
     (d) 90%

2. Diamond is harder than graphite because of

     (a) difference in layers of atoms
     (b) tetrahedral structure of atoms
     (c) difference of crystalline structures
     (d) None of these

3. Which of the following vegetable oils does not contain essential fatty acids?

     (a) Sunflower oil
     (b) Mustard oil
     (c) Coconut oil
     (d) Groundnut oil

4. Which of the following is used as filler in tyre of rubber?

     (a) Coal
     (b) Coke
     (c) Graphite
     (d) Carbon black

5. The polymerization of which of the following is used in manufacturing of polythene in industry?

     (a) Methane
     (b) Styrene
     (c) Acetylene
     (d) Ethylene

6. The gas used for artificial fruit ripening of green fruit is

     (a) Ethylene
     (b) Acetylene
     (c) Ethane
     (d) Methane

7. Which of the following elements is non-radioactive?

     (a) Uranium
     (b) Thorium
     (c) Plutonium
     (d) Zirconium

8. A metal is exposed to the atmosphere for sometime it becomes coated with green carbonate. The metal must be

     (a) Silver
     (b) Copper
     (c) Aluminium
     (d) Zinc

9. Which of the following is a super cooled liquid?

     (a) Ice Cream
     (b) Teflon
     (c) Glass
     (d) Mercury

10. Which is the purest form of Iron?

     (a) Steel
     (b) Cast Iron
     (c) Pig Iron
     (d) Wrought Iron

11. The first metal used by a man was

     (a) Copper
     (b) Silver
     (c) Bronze
     (d) Brass

12. Detergents used for cleaning clothes and utensils contain

     (a) nitrates
     (b) bicarbonates
     (c) sulphonates
     (d) bismuthates

13. Metal are good conductors because

     (a) they contain free electrons
     (b) they contain reflecting surface
     (c) the molecules in them collide very freely
     (d) the molecules in them are very close to each other

14. Which variety of coal contains recognizable traces of the original plant material?

     (a) Anthracite
     (b) Lignite
     (c) Peat
     (d) Bitumen

15.  Which of the following metals form an amalgam with other metals?

     (a) Lead
     (b) Tin
     (c) Zinc
     (d) Mercury

 

Answer: (1) b (2) a (3) a (4) d (5) d (6) a (7) d (8) b (9) c (10) d (11) a (12) c (13) a (14) c (15) d