Penicillin was discovered by
Alexander Fleming
Sir JJ Thomson
Dr Nessler
Sir John Russel
Correct Answer :
A. Alexander Fleming
Related Questions
The simplest hydrocarbon is
benzene
methane
ethane
butane
Triple Antigen treatment for children is to ward off
whooping cough
tetanus
diphtheria
All the three
A mixture of ethyl alcohol and water can be separated by
evaporation
sublimation
using a separating funnel
fractional distillation
The best specimen for drinking purposes is
rain water
river water
conductivity water
deep well water
Invert sugar is
sucrose
glucose
fructose
a mixture of glucose and fructose
The most abundant noble gas present in air is
neon
argon
helium
krypton
The sugar which is used in silvering mirrors is
sucrose
maltose
glucose
fructose
Chloroform used as anaesthetic should be preserved In the dark in tightly stoppered bottles because otherwise
it becomes coloured
it gets evaporated in air
it gets oxidised to phosgene
it gets decomposed to chloropicrin
The formula for cane sugar is
C6H12O6
C2H5OH
C12H22O11
C7H8O
Tincture iodine is a solution of
iodine in potassium iodide
iodine in alcohol
iodine in water
iodine in carbon disulphide
Calomel is
lead chloride
mercurous chloride
mercuric chloride
calcium sulphate
The fertilizer which has the largest percentage of nitrogen is
urea
ammonium nitrate
ammonium sulphate
calcium cyanamide
An acid which is used as a preservative for pickles is
hydrochloric acid
citric acid
tartaric acid
acetic acid
Gases have
a definite shape but not volume
a definite volume and shape
a definite volume but not shape
neither definite volume nor shape
The main constituent of gobar gas is
methane
nitrogen
carbondioxide
ethylene
Invar, used for making pendulums is an alloy of steel with
tungsten
nickel
manganese
chromium
Nylon is made from
terephthalic acid and ethylene glycol
hexamethylene diamine and adipic acid
cellulose nitrate
cellulose acetate
Which one of the following is present in the largest amount in terms of per cent by mass in the earth's crust?
Silicon
Oxygen
Carbon
Calcium
The gas used in balloons in the place of hydrogen is
nitrogen
helium
neon
argon
Which of the following is not an alloy of copper?
Bronze
Brass
Solder
Gun metal
Rusting of iron cannot be prevented by
painting
applying alkaline phosphate
applying soap water
galvanising
The raw materials used in the manufacture of cement are
brimstone and silica
limestone and clay
brimstone and clay
brimstone and limestone
Heated saw dust catches fire when a drop of concentrated nitric acid is added to it. This is due to
dehydration
oxidation
reduction
dehydrogenation
The gas which has a faint sweet odour is
nitrogen
nitrous oxide
nitric oxide
nitrogen peroxide
Plastics are synthetic
rubbers
fibres
resins
sugars
Temporary hardness is due to the presence of
calcium carbonate
calcium bicarbonate
magnesium sulphate
calcium sulphate
Galvanising is coating Iron with
nickel
zinc
chromium
copper
The neutron was discovered by
Chadwick
Madam Curie
Becquerel
Aston
Which of the following la a very good supporter of combustion?
Carbon monoxide
Oxygen
Nitrogen
Hydrogen
Which of the following statements regarding natural radioactivity is true?
It is spontaneous disintegration of atoms
It is induced by bombardment with projectiles
It is transmutation of atoms with projectiles
It is dependent on temperature