Question

SU
1. Which of the following is the lightest metal?
(a) Mercury
(b) Silver
(c) Lithium
(d) Lead
2. Which is the second most abundant element in the earth's crust?
(a) Oxygen
(b) Silicon
(c) Aluminium
(d) Iron
3. Artificial silk is also called :
(a) Rayon
(b) Nylon
(c) Dacron
(d) Fibre glass
4. The mostmalleable metal is
(a) Gold
(b) Silver
(c) Aluminium
(d) Copper
5. Which of the following is used as a material for making protective windows in space probes?
(a) Steel
(b) Tungsten
(c) Graphite
(d) Diamond
6. Washing soda is the common name for
(a) Calcium carbonate
(b) Calcium bicarbonate
(c) Sodium carbonate
(d) Sodium bicarbonate
7. Which of the following gases is not known as 'green house gas'?
(a) Carbon dioxide (b) Nitrogen oxide (c) Chlorofluorocarbons (d) Methane
8. Which of the following is the lightestgas?
(d) Radon
(a) Nitrogen
(b) Hydrogen
(c) Carbon dioxide
9. Which of the following metals was first discovered by man?
(d) Copper
(a) Bronze
(b) Silver
10. Galvanised iron sheets have a coating of
(d) Chromium
(c) Iron
Tin​

Answer 1

Answer:

Lithium

Silicon

Rayon

Gold

Diamond

Sodium carbonate

Chloroflorocarbons

Hydrogen

Copper

Zinc

Explanation:

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Answer 2

Hey Mate Here Is Your Ans..❣️

Answer:

1) (c) Lithium.

2) (b) Silicon.

3) (a) Rayon.

4) (a) Gold.

5) (d) Diamond.

6) (c) Sodium Carbonate.

7) (c) chlorofluorocarbons.

8) (b) Hydrogen.

9) (d) Copper.

10) Zinc.

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