Isotopes differ in the number of
Protons
Neutrons
Electrons
Protons and electrons
Correct Answer :
B. Neutrons
Related Questions
Alum is used
as an analgesic
in the purification of water
as a fertilizer
as a disinfectant
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
The oldest known organic compound is
urea
methane
acetic acid
benzene
A substance used both as an explosive and as a germicide is
phenol
TNT
picric acid
iodoform
An element which is preserved under water is
Sodium
red phosphorus
white phosphorus
sulphur
The addition of a neutron to the nucleus of an atom
increases the atomic mass of the atom
decreases the atomic mass of the atom
increases the charge on the nucleus
decreases the charge on the nucleus
Radium was isolated from
galena
dolomite
sylvine
pitchblende
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.
An important use of nitrous acid is in
the manufacture of explosives
the manufacture of dyes
refrigerators
the preparation of drugs
Proteins are polymerisation products of
aldehydes
alkenes
amino acids
alkynes
The substance preserved under water is
potassium
sodium
red phosphorus
white phosphorus
The human body contains about
50% water
10% water
70% water
20% water
Which of the following la a very good supporter of combustion?
Carbon monoxide
Oxygen
Nitrogen
Hydrogen
Apart from lead tetra-ethyl, the other compound used as antiknock is
n-heptane
n-octane
iso-heptane
iso-octane
Dry Ice is
solid carbon dioxide
liquid oxygen
liquid hydrogen
liquid. Chlorine
Which of the following cannot be used as fuel?
Gasoline
Kerosene
Sulphuric acid
Alcohol
Oxalic acid is used in the manufacture of
tincture iodine
paints
ink
aerated water
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
Marble is
calcium carbonate
sodium carbonate
magnesium sulphate
ferric chloride
BHC is a
Rodenticide
Herbicide
Pesticide
Fungicide
Which of the following types of water gives lather easily with soap?
Hard water
Heavy water
Soft water
Both (a) and (b)
Which or the following electrolysis?
Aluminium
Copper
Zinc
Iron
Concrete is a mixture of
cement an limestone
cement and sand
cement and gravel
cement, sand and gravel
Which of the following elements is not required for the healthy growth of plants?
Nitrogen
Phosphorus
Potassium
Mercury
An antipyretic is a drug used
in the treatment of malaria
to relieve sleepiness
to induce sleep
to lower body temperature
The ore of iron is
Dolomite
Magnetite
Bauxite
Anglesite
Which of the following is used in fuel to propel rockets?
Petrol
Kerosene
Hydrazine
Alcohol
Riboflavin deficiency causes
tongue inflammation
pellagra
night blindness
anaemia
The fertilizer which has the largest percentage of nitrogen is
urea
ammonium nitrate
ammonium sulphate
calcium cyanamide
Gasoline is obtained from crude petroleum by
fractional distillation
fractional crystallisation
sublimation
evaporation