Bakelite is chemically known as
Polyvinyl chloride (PVC)
Polybutadiene
Phenol formaldehyde
Polyurethane
Correct Answer :
C. Phenol formaldehyde
Related Questions
Sea water contains about __________ ppm of bromine.
5
70
500
1700
Pick out the correct statement.
A fat is converted into oil by its hydrogenation
There is no difference between a fat and an oil so far as its physical properties are concerned
All vegetable oils except coconut oil, contains fatty acids having more than sixteen carbon atoms
Vegetable oils are classified as drying, non-drying and semi drying oils depending upon their fatty acids content
Use of chlorine in the treatment of sewage
Helps in grease separation
Increases the biological oxygen demand (BOD)
Causes bulking of activated sludge
Aids in flocculation
The enzyme which converts starch into the disaccharides maltose is
Diastase
Maltase
Yeast
None of these
Zeolite used in water softening process (cation exchange) is regenerated by washing with
Brine
Chloramines
Sodium bisulphite
Liquid chlorines
A bio-catalyst produced by living cells which acts independent of the cell is called a/an
Substrate
Enzyme
Nutrient
None of these
Pick out the wrong statement.
Pasteurisation of milk involves moderate heating followed by cooling
Bakeries and breweries make use of yeasts
Enzyme is a complex nitrogenous compound
Oils and fats are alkaloids
Pasteurisation of milk means
Removal of fatty and albuminous substance from it
Killing of organisms present in it by heating it at controlled temperature without changing its natural characteristics
Inhibiting the growth of micro-organisms without killing them
None of these
Litharge is
Lead oxide
Zinc oxide
Zinc sulphide
Cellulosic photographic material
Ultimate analysis of coal determines its __________ content.
Carbon, hydrogen, nitrogen & sulphur
Carbon, ash, sulphur & nitrogen
Carbon, sulphur, volatile matter & ash
Carbon, volatile matter, ash & moisture
Reverse osmosis is normally used for the
Separation of isotopes of uranium from gaseous uranium hexafluoride
Separation of helium from natural gas
Desalination of brackish water to produce potable (drinking) water
Purification of oxygen
Lithophane is
Explosive
White lead
Filter aid
ZnS (white pigment)
Function of sodium thiosulphate (hypo) in development of photographic film/plate is to
Brighten the faint images
Remove metallic silver
Convert silver chloride to silver
Remove unexposed silver halide
Fish contains about __________ percent oil.
5
10
20
35
Most commonly used rubber vulcanising agent is
Sulphur
Bromine
Platinum
Alumina
Type of glass used in optical work is the __________ glass.
Soda-lime
Fibre
Lead
Borosilicate
The temperature in the calcium carbide furnace is __________ °C.
200-300
700-850
2000-2200
4000-4500
99.5% purity oxygen is used in
Cutting and welding by oxy-acetylene flame
Hospitals for medicinal purposes
Gas masks and artificial breathing apparatus
All (A), (B), and (C)
Nitrile rubber is produced by the polymerisation of
Acrylonitrile and butadiene
Acrylonitrile and styrene
Isobutylene and isoprene
None of these
Silicon carbide is a/an
Adhesive
Abrasive
Type of glass
Brittle material
__________ is used as a flux in the smelting of copper ore like chalcopyrite.
Coke breeze
Lime powder
Silica/quartz
Dolomite
Commercially ethylene is produced from naphtha by
Catalytic cracking
Catalytic dehydrogenation
Pyrolysis
Hydrocracking
A cane sugar factory having sugar production rate of 10 tons/day will produce about __________ tons/day of bagasse (after consumption by the factory for heating etc.).
1
10
25
40
The main component of Pyrex glass is
Zinc
Lead
Boron
Selenium
Thermal pyrolysis of ethylene dichloride produces
Trichloroethylene
Vinyl chloride
Ethanol amine
Ethylene oxide
Exothermic condensation reaction of monochlorobenzene with chloral in presence of 20% oleum as catalyst produces DDT. The reaction temperature is maintained at __________ °C.
15-30
90-100
250-300
< 0
H2S is scrubbed from refinery gases by absorption using
Dilute H2SO4
Ethanol amine
Chilled water
Tri-butyl phosphate
Calcination of gypsum produces
Plaster of Paris
Salt cake
Nitre cake
Lime
Cumene (isopropyl benzene) is made by
Oxidation of naphthalene
Propylene alkylation of benzene
Polymerisation of a mixture of benzene & propylene
None of these
Main product in calcium carbide-water reaction is
Ca(OH)2
C2H2
CO2
CaCO3