1.      What is the main element found in steel?

                   Iron

2.      The gas which cause acid rain in industrial area.

                   Sulphur dioxide

3.      The gas helps to ripen fruits:

                  Ethylrrene

4.      Which gas is essential for combustion?

                  Oxygen

5.      Which of the following materials is the best conductor of Electricity?

                   Silver

6.      Which of the following is the best conductor of Electricity?

                   Salt water

7.      ……………is the purest form of carbon

                  Diamond

8.      How much part of the iceberg is visible above the surface of water?

                  1\10

9.      A light –sensitive compound used in photography is                    

                 Silver bromide

10.  Thin leaves of which metal are used as Ayurvedic

                 Gold

11.  Which of the following is used in rockets to burn the fuels?

                 Liquid Oxygen

12.  The Noble Gas which is present in microscopic quantities air is………

                 Krypton

13.  Which of the following is not an explosive?

                  Trinitron chlorine

14.  The inert gas obtained as a component of natural hydrocarbon gas is

                   Helium

15.  The raw material used in the manufacture of cement is………

                   Limestone and gypsum

16.  Sodium is kept in ……..liquid

                     Kerosene

17.  Mercury is a__________

                      Metal

18.  A substance having long chains of similar molecules linked together are called…………

                      Polymer

19.  The gas used for welding:

                        Acetylene
  
20.  What metallic element is found in “fool’s gold”?           
     
                        Iron

21.  Which of the following gases is used in cigarette lighters?

                        Butane

22.  The raw materials from which, rayon is manufactured

                        Cellulose
23.  The term ‘octane number’ is related to…….

                        Petrol

24.  Which of the following is present in hard water?

                       Calcium

25.  Freon-12 is used ad


                      Refrigerant
 
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