01. From Heavy Rains
the purest form of water can be obtained.
02. Diamond and
Emerald contain Carbon and silicon.
03. Cloudy nights are
warmer than clear nights due to Prevention of heat
radiated out by the earth from escaping into the sky.
04. Copper is semi-conductor.
05. A camera forms Real but inverted images.
06. Carbon dioxide gas is used in Soda water.
07. If a red flower
is placed in green light it will appear black.
08. The metal “Lead” is used in storage batteries.
09. Ammeter is an instrument used to detect the
presence of a current in a circuit.
10. The acid that
helps in digestion is Acetic acid.
11. Sewage is the most common cause of water
pollution in Pakistan.
12. Electrocardiograph
is an instrument used in the study of Heary.
13. Soap and
detergents remove the dirt from clothes due to Osmosis.
14. Wave length of
Ultra violet light is 5500 A.
15. The green colour
of water in a lake is due to Excessive growth of sea weeds.
16. 14 carat gold
means an alloy containing 14 parts of gold and 10
parts of copper.
17. The stars are not
visible in the day time because of sun`s brightness
during day time.
18. Uranium
Plutonium Oxide Fuel is used in a Fast Breeder Reactor.
19. Monsoon is caused
by Seasonal reversal of winds.
20. Atmospheric
layers “Lonosphere” help in radio communication.
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