The commonest ore of aluminium is
cryolite
bauxite
malachite
azurite
Correct Answer :
B. bauxite
Related Questions
The process that takes place in the atom bomb is
nuclear' fusion
radioactive disintegration
nuclear fission
chemical decomposition
Annealing of glass is done in
a cupel
a long narrow chamber
an open furnace
a closed furnace
The compounds produced by plants in the process of photosynthesis are
carbohydrates
proteins
salts
fats
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.
Burglar proof safes are made of
Tungsten steel
Manganese steel
Chromium steel
Nickel steel
Sulphur is readily soluble in
Water
Alcohol
Carbon-di-sulphide
Sodium chloride solution
The malarial parasite was discovered by
Sir Ronald Ross
Sir Francis Haig
Dr Jagadish Chandra Bose
Sir CV Raman
Rooms in places infected by plague are disinfected using
bleaching powder
iodoform
sulphur dioxide
chlorine
Biogas is obtained during
decomposition of petrol
fermentation of animal and plant waste
destructive distillation of coal
electrolysis of water
Which among the following is a local anaesthetic?
Chloroform
Morphine
Streptomycin
Cocaine
Grape sugar is another name for
glucose
fructose
sucrose
maltose
One of the ingredients of the paste on the side of a match box is
phosphorus pentaoxide
phosphorus trichloride
phosphorus trisulphide
phosphorus trioxide
The pure at form of iron is
wrought iron
steel
pig iron
nickel steel
Alum is used
as an analgesic
in the purification of water
as a fertilizer
as a disinfectant
Calamine is a ore of
tine
magnesium
zinc
copper
Refined petroleum is decolourised by
manganese dioxide
bauxite
animal charcoal
quicklime
An essential condition for rusting is
high temperature
light
moisture
dry air
The first organic compound prepared in the laboratory was
acetic acid
chloroform
urea
methane
Ozone is an allotrope of Oxygen, containing ______ atom/s of oxygen per molecule instead of two.
three
four
one
five
Annealing of glass is carried out by
rapid cooling
rapid heating
slow cooling
slow heating
Plaster of Paris
contracts while setting
expands while setting
is highly volatile
does not suffer any changes in volume while setting
Heavy water was discovered by
TW Richards
FW Aston
Stas
Urey
Vulcanisation was discovered by
Goodyear
Wohler
Baeyer
Perkin
The depletion of the ozone layer in the upper atmosphere is due to -extensive use of
dichloro-phenoxy-acetic acid
superphosphate of lime
chlorofluorocarbons (CFC)
dichloro-diphenyl-trichloro-ethane
Graphite la a good conductor of electricity because
it is an allotrope of carbon
it gives CO2 on heating
it contains free electrons
it is oxidised to graphitic acid
Galvanising is coating Iron with
nickel
zinc
chromium
copper
The hormone which absorption is increases glucose oxidation and glucose
adrenalin
thyroxin
insulin
epinephrine
Which one of the following is used for dry cleaning?
Kerosene oil
Diesel oil
Lubricating oil
Petroleum ether
CAN is used as (Calcium Ammonium Nitrate)
an explosive
a fertilizer
a dye
a bleaching agent
The form of carbon used in decolourising sugar solution is
wood charcoal
animal charcoal
coconut charcoal
lamp black