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Describe the major components of air pollution.
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The commercial unit of energy is :
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Name the type of waves which are used by astronauts to communicate with one another on moon (or in outer space).
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Describe the causes and effects of air pollution.
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Name one solid, on liquid and one gas through which sound can travel.
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Is the speed of sound more in water or in steel?
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In which medium sound travels faster : air or iron?
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In which medium sound travels fastest : air, water or steel?
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Out of solids, liquids and gases :
(a) in which medium sound travels slowest?
(b) in which medium sound travels fastest?
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State one observation from everyday life which shows that sound travels much more slow than light.
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Write the full form of IUPAC.
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In which medium sound travels faster : air or hydrogen?
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Why is air called breath of life? Enumerate functions of air or atmosphere.
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Name the scientist who gave law of conservation of mass.
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Name the law of chemical combination which was given by Lavoisier.
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Name the law of chemical combination which was given by Proust.
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Which of the following terms apply to sound waves in air and which to water waves?
Transverse, Rarefaction, Trough, Crest, Compression, Longitudinal
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Name the three subatomic particles present in an atom.
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What is the usual symbol for (a) and electron (b) a proton, and (c) a neutron?
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‘If 100 grams of calcium carbonate (whether in the form of marble or chalk) are decomposed completely, then 56 grams of calcium oxide and 44 grams of carbon dioxide are obtained’. Which law of chemical combination is illustrated by this statement ?
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