QUESTION & ANSWER

1.      PVC plastics are obtained from Vinyl chloride by the process of

                             Polymerization

2.      When steam is blown over white- hot coke, we get

                          Water gas

3.      Name the hydrocarbon containing three carbon atoms

                         Propane

4.      Which of the following gives the percentage of carbon dioxide present in the atmosphere?

                             .03%

5.      Which of the following substance consists of only one element?

                              Diamond

6.      Most soluble in water is                       

                                Sugar

7.      This of the following metal is not found in nature?

                               Plutonium

8.      Which material is commonly known as ‘Terylene’?

                              Synthetic fibre

9.      The best conductor of heat among liquid is……

                                 Mercury

10.  Avogadro’s law is applicable to…………….

                                Gases
11.  Sugar contains.............

                              Carbohydrates

12.  The element required for solar energy conversion is………

                               Silicon

13.  How many elements occur in nature?

                                 92

14.  Potassium Nitrate is used in

                             Fertilizer

15.  When sugar is treated with sulphuric acid we get a very pure form of:

                               Carbon

16.  Carbon dating method is used to determine the age of ……

                                Fossils
   
17.  Water for civil supplies is commonly purified by:           

                           Chlorination

18.  Of the following gems, which one is called “liquid gold”?

                 Petroleum

19.  Which is the gas used for lifting airships and balloons up into the air?

                  Helium

20.  The boiling point of water on the Kelvin scale of temperature is…..

                   373

21.  Lead pencil consists of

                 Clay and graphite

22.  The relative density of gold is

                  19.30

23.  Which chemical element has the atomic number 1?
          
                 Hydrogen

24.  Every battery has……….terminals.

                     2

25.  Hydrogen has………isotopes


                   3