General Science-71

      1.    Rust is:

a.    A mixture of Fe₂O₃ and Fe(OH)₂

b.    A mixture of FeO and Fe(OH)₂

c.    FeO only

d.    A mixture of Fe₂O₃, 3H₂O and FeO

     2.    Liquefied Petroleum gas (LPG) consists of mainly:

a.    Methane, Ethane and Hexane

b.    Ethane, Hexane and Nonane

c.    Methane, Butane and Propane

d.    Methane, Hexane and Nonane

     3.    The metal that is present in Photo Films is:

a.    Mercury

b.    Platinium

c.    Magnesium

d.    Silver

     4.    Which of the following is in liquid form at room temperature?

a.    Cerium

b.    Sodium

c.    Francium

d.    Lithium

     5.    Soda water contains:

a.    Nitrous acid

b.    Carbonic acid

c.    Carbon dioxide

d.    Sulphuric acid

     6.    Which of the following is basis of the modern periodic table?

a.    Atomic mass

b.    Atomic number

c.    Atomic size

d.    Atomic volume

     7.    Of the following metals, which one pollutes the air of a big city?

a.    Copper

b.    Cadmium

c.    Lead

d.    Chromium

     8.    Brass is an alloy of:

a.    Nickel and Copper

b.    Copper and Silver

c.    Nickel and Zinc

d.    Zinc and Copper

      9.    The element required for Solar energy conversion:

a.    Beryllium

b.    Silicon

c.    Tantalum

d.    Ultra pure carbon

     10. Monazite is an ore of:

a.    Sodium

b.    Titanium

c.    Thorium

d.    Zirconium

     11. Potassium Permanganate is used for purifying drinking water, because:

a.    It dissolves the impurities of water

b.    It is a sterilizing agent

c.    It is an oxidising agent

d.    It is a reducing agent.

     12. The presence of which of the following salts in water causes corrosion in steam boilers?

a.    Sodium Chloride

b.    Magnesium Chloride

c.    Calcium bicarbonate

d.    Potassium bicarbonate

     13.  Water is a good solvent of ionic salts because:

a.    It has no colour

b.    It has a boiling point

c.    It has a high dipole moment

d.    It has a high specific heat

     14.  The hardest substance available in earth is:

a.    Platinum

b.    Silicon

c.    Diamond

d.    Gold

     15. Which of the following is the best conductor of electricity ?

a.    Zinc

b.    Copper

c.    Gold

d.    Silver

     16.  The ratio of pure gold in 18 carat gold is:

a.    60%

b.    75%

c.    80%

d.    100%

    17.                        Cow milk is a rich source of:

a.    Vitamin A

b.    Vitamin B₁

c.    Vitamin C

d.    Vitamin D

    18.                        The element found in the surface of the Moon is:

a.    Tin

b.    Tungsten

c.    Tantalum

d.    Titanium

     19.                        The average salinity of sea water is:

a.    2%

b.    3%

c.    2.5%

d.    3.5%

    20.                        Which of the following is the most stable element?

a.    Uranium

b.    Hydrogen

c.    Oxygen

d.    Lead