General Science-70

      1.    Bleaching powder is made from:

a.    Sulphur dioxide and gypsum

b.    Chlorine and Charcoal

c.    Soda ash and lime

d.    Lime and Chlorine

     2.    The two elements that are frequently used for making transistors are:

a.    Boron and Aluminium

b.    Silicon and Germenium

c.    Iridium and Tungsten

d.    Niobium and Columbium

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

a.    Methane

b.    Carbon dioxide

c.    Nitrous oxide

d.    CFC

     4.    Which of the following is not a neutral oxide?

a.    Carbon Monoxide

b.    Sulphur Dioxide

c.    Water

d.    Nitric Oxide

     5.    Which of the following is used in making smoke bombs?

a.    Sulphur

b.    Phosphorus

c.    Hydrogen

d.    Carbon

     6.    Caustic Soda is:

a.    Nacl

b.    Na₂CO₃

c.    NaOH

d.    NaHCO₃

     7.    Chemical formula of Water glass is:

a.    Na₂SiO₃

b.    Al₂O₃

c.    NaAlO₂

d.    CaSiO₃

     8.    Which of the following is not a bleaching agent?

a.    Sulpher di-oxide

b.    Carbon di-oxide

c.    Sodium hypochlorite

d.    Chlorine

     9.    The gas usually filled in electric bulb is;

a.    Hydrogen

b.    Oxygen

c.    Nitrogen

d.    Carbon di-oxide

    10.  Heavy water is:

a.    Tritium oxide

b.    Deuterium oxide

c.    Rain water

d.    Water at 4°C

     11.   The gases used in different types of welding would include:

a.    Oxygen & Hydrogen

b.    Oxygen, acetylene & argon

c.    Oxygen & acetylene

d.    Oxygen, hydrogen & nitrogen

     12.  Which of the following alloys is used for making magnets?

a.    Duralumin

b.    Stainless Steel

c.    Alnico

d.    Magnelium

     13. Parmanent hardness of water may be removed by the addition of:

a.    Alum

b.    Sodium Carbonate

c.    Lime

d.    Potassium Permanganate

     14. Potassium nitrate is used in:

a.    Salt

b.    Glass

c.    Fertiliser

d.    Medicine

     15. In which type of rocks are metals like Gold and Copper mostly found?

a.    Old igneous

b.    Old sedimentary

c.    Old metamorphic

d.    New metamorphic

     16. Which of the following gases is lighter than air?

a.    Carbon dioxide

b.    Oxygen

c.    Ammonia

d.    Chlorine

    17. Which of the following is used as lubricant?

a.    Graphite

b.    Silica

c.    Diamond

d.    Iron Oxide

     18. The purest form of iron is:

a.    Steel

b.    Pig iron

c.    Cast iron

d.    Wrought iron

     19. The percentage of carbon is the least in:

a.    Grey cast iron

b.    Wrought iron

c.    White cast iron

d.    Steel

     20. The colour of Emerald is:

a.    Violet

b.    Yellow

c.    Deep Green

d.    Prussian Blue

     21. Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of:

a.    Nitrates

b.    Zeolites

c.    Sulphonates

            d.  None of these