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1. The tree sends down roots from its branches to the soil is known as:

A

Oak

B

Pine

C

Banyan

D

Palm

2. Electric bulb filament is made of:

A

Copper

B

Aluminum

C

Lead

D

Tungsten

3. Brass gets discoloured in air because of the presence of which of the following gases in air?

A

Oxygen

B

Hydrogen Sulphide

C

Carbox dioxide

D

Nitrogen

4. Which of the following is a non metal that remains liquid at room temperature?

A

Phosphorous

B

Bromine

C

Chlorine

D

Helium

5. Chlorophyll is a naturally occurring chelate compound in which central metal is:

A

Copper

B

Magnesium

C

Iron

D

Calcium

6. Which of the following is used in pencils?

A

Graphite

B

Silicon

C

Charcoal

D

Phosphorous

7. Which of the following metals forms an amalgam with other metals?

A

Tin

B

Mercury

C

Lead

D

Zinc

8. The gas usually filled in the electric bulb is:

A

Nitrogen

B

Hydrogen

C

Carbon dioxide

D

Oxygen

9. Washing soda is the common name for

A

Sodium Carbonate

B

Calcium Bicarbonate

C

Sodium Bicarbonate

D

Calcium Carbonate

10. Quartz crystals normally used in quartz clocks etc. is chemically :

A

Silicon Dioxide

B

Germanium Oxide

C

A mixture of Germanium Oxide and Silicon dioxide

D

Sodium Silicate

11. Which of the gas is not known as green house gas?

A

Methane

B

Nitrous oxide

C

Carbon dioxide

D

Hydrogen

12. Bromine is a :

A

Black Solid

B

Red Liquid

C

Colourless Gas

D

Highly Inflammable Gas

13. Which of the following is used as a lubricant?

A

Graphite

B

Silica

C

Iron Oxide

D

Diamond

14. The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is

A

Argon

B

Xenon

C

Helium

D

Krypton

15. The property of a substance to absorb moisture from the air on exposure is called:

A

Osmosis

B

Deliquescence

C

Efflorescence

D

Desiccation

16. The average salinity of sea water is :

A

3%

B

3.5%

C

2.5%

D

2%

17. When an iron nail gets rusted, iron oxide is formed:

A

Without any change in the weight of the nail

B

With decrease in the weight of the nail

C

With increase in the weight of the nail

D

Without any change in colour or weight of the nail

18. Galvanised iron sheets have a coating of :

A

Lead

B

Chromium

C

Zinc

D

Tin

19. Among the various allotrope of carbon

A

Coke is the hardest, graphite is the softest

B

Diamond is the hardest, coke is the softest

C

Diamond is the hardest, graphite is the softest

D

Diamond is the hardest, lamp black is the softest

20. The group of metals Fe, Co, Ni may best called as:

A

Transition metals

B

Main group metals

C

Alkali metals

D

Rare metals