The presence of dust particles in air serves
as a nucleus to condense water vapour resulting in rain
to maintain the average density of air
to minimise the inflammatory nature of oxygen
to protect the inhabitants of the earth from the effects of ultra violet rays.
Correct Answer :
A. as a nucleus to condense water vapour resulting in rain
Related Questions
Gases have
a definite shape but not volume
a definite volume and shape
a definite volume but not shape
neither definite volume nor shape
Carbogen is used in
CO2 poisoning
CO poisoning
phosgene poisoning
anesthesia
Which of the following is not a characteristic of potable water?
It must be free from suspended impurities
It must be free from harmful bacteria
It must contain traces of sodium bicarbonate
It must have a fishy odour
Rooms in places infected by plague are disinfected using
bleaching powder
iodoform
sulphur dioxide
chlorine
The term 'nucleons' apples to
neutrons
protons
protons and neutrons
protons and electrons
The discoverer of chloroform was
Liebig
Pasteur
Bunsen
Erlenmeyer
White lead is
a basic salt
an acid salt
a double salt
a normal salt
Compounds of nitrogen with metals are called
nitrates
nitrites
hyponitrates
nitrides
Water always contains hydrogen and oxygen in the ratio 1:8 by weight. This is in accordance with the
Law of Multiple Proportions
Law of Definite Proportions
Law of Conservation of Mass
Law of Reciprocal Proportions
The modern system of symbols was evolved by
Dalton
Cavendish
Avogadro
Berzelius
The rate of setting of cement is slowed down by the addition of
quicklime
gypsum
soda lime
bleaching powder
The iron salt used in blue prints is
ferric sulphate
ferric oxalate
ferric nitrate
ferric chloride
Triple Antigen treatment for children is to ward off
whooping cough
tetanus
diphtheria
All the three
Suspended impurities in water are effectively removed by
adding milk of lime
filtering through sand
adding filter alum
chlorination
Which of the following is a communicable disease caused by viruses?
Cholera
Dysentery
Diabetes
Measles
Gold dissolves in aqua regia due to the formation of
chloro auric acid
auric chloride
gold nitrate
aurous chloride
Methylated spirit is a mixture of
methyl alcohol and acetic acid
methyl alcohol and ethyl alcohol
ethyl alcohol and pyridine
methyl alcohol and pyridine
The substance most abundantly found in sea water is
magnesium chloride
sodium chloride
calcium sulphate
potassium chloride
Sulphur is readily soluble in
Water
Alcohol
Carbon-di-sulphide
Sodium chloride solution
The gas evolved when ammonium nitrate is heated is
nitrogen
nitric oxide
nitrogen peroxide
nitrous oxide
Boiler scales' contain
calcium carbonate
magnesium bicarbonate
calcium sulphate
magnesium sulphate
Brass contains
copper and tin
aluminium and magnesium
copper and zinc
copper, tin and zinc
In the making of jewels, gold is usually mixed with
zinc
tin
copper
aluminium
Iron is rendered passive by
conc. H2SO4
conc. HCl
conc. HNO3
acetic acid
The metal which reacts most violently with cold water is
calcium
sodium
magnesium
potassium
Copper is purified by
poling
tempering
calcination
galvanising
Which of the following is called 'the King of Chemicals?
Nitric acid
Hydrochloric acid
Silver nitrate
Sulphuric acid
Which one of the following is not radioactive?
Astatine
Francium
Tritium
Zirconium
Which among the following is a solid non-metal?
chlorine
mercury
water
iodine
In addition to nitric acid, another acid which may render iron passive is
acetic acid
oxalic acid
chromic acid
citric acid