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(Q.1) Name the main
component of compressed natural gas.
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(Q.2) Give one use of
nitrogen gas.
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(Q.3) Name one fossil fuel
used for generation of electricity.
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(Q.4) Name a gas which is
present in air in very small amount.
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(Q.5) Where does nitrogen
fixation occurs in plants?
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(Q.6) Which gas is required
for release of energy from glucose in the bodies of living organisms during
combustion of food?
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(Q.7) What are the two substances
necessary for rusting of iron?
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(Q.8) Name two pollution
free clean fuels.
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(Q.9) What are the main
constituents of LPG?
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(Q.10) Name three important
processes that cannot be performed in absence of oxygen.
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(Q.11) a. Name two green
house gases.
b. What effect these gases produce on our
atmosphere?
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(Q.12) a. Name the
components of air.
b. Write four uses of air. |
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(Q.13) Why do wet clothes dry up quickly in sunlight compared to shades?
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(Q.14) How do fish and aquatic plants survive in water?
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(Q.15) Which liquid is called universal solvent and why?
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(Q.16) �Define the following
(i) Transpiration ii) Cloud |
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(Q.17) Which process is involved in the removal of salt
from the sea water?
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(Q.18) Name the water body which contains the highest
concentration of salt in it?
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(Q.19) Why is water used as coolant in the radiator of
engines?
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(Q.20) In which form water is present in atmosphere?
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(Q.17) Name the only substance which occurs in three states
under the temperature range of 0 �C to 100 �C.
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(Q.18) Name the phenomenon by which plants loses water from
their leaves.
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