Flexible foam (for mattresses) is usually made of
PVC
Silicone
Polyurethanes
Polyamides
Correct Answer :
C. Polyurethanes
Related Questions
Main constituent of limestone is
CaCO3
MgCO3
Na2CO3
CaSO4
Production of alcohol by fermentation of molasses is a/an __________ process.
Anaerobic
Aerobic
Endothermic
Both (B) and (C)
Celluloid is chemically
Cellulose acetate
Regenerated cellulose
Cellulose nitrate
Cellulose acetate butyrate
Esterification reaction produces
Detergent
Vanaspati
Soap
Mercaptans
Massecuite is a terminology used in the __________ industry.
Paint
Oil hydrogenation
Soap
Sugar
Magnesium and calcium __________ cause temporary hardness of water.
Carbonates
Bicarbonates
Phosphates
Sulphates
Bleaching powder (chemically known as calcium chloro hypochlorite) is commercially produced by the action of chlorine on
Slaked lime
Soda lime
Calcium perchlorate
None of these
Oleum produces fumes of
SO2
H2SO4
SO3
SO2 + H2SO4
__________ paper is used in the manufacture of newsprint paper.
Ground-wood
Board
Tissue
Wrapping
Very dilute solutions are generally used in fermentation reactions for which the optimum temperature range is __________ °C.
-5 to 0
5 to 10
30 to 50
75 to 80
Commercial production of soda ash by Solvay process requires limestone, __________ as raw materials.
Coke and sand
Brine and coal
Coke and caustic soda
None of these
Sulphur addition in soap is done to
Improve the soap texture
Cure pimples & dandruff
Fasten lather formation
Increase its cleansing action
Nylon-6 as compared to Nylon-66 is having higher
Hardness
Abrasion/resistance
Melting point
None of these
Synthetic glycerine is produced from
Toluene
Phenol
Propylene
Naphthalene
Extraction of __________ employs an electrolytic process.
Aluminium
Silver
Copper
All (A), (B) and (C)
Which of the following paper does not require a filler during manufacture?
Bond paper
Writing paper
Blotting paper
Coloured paper
Trinitrotoluene (TNT), an explosive, is made by the nitration of
Nitrobenzene
Toluene
Nitrotoluene
Benzene
Sea water contains about __________ ppm of bromine.
5
70
500
1700
Ordinary glass is not a/an
Amorphous isotropic material
Supercooled liquid
Material with sharp definite melting point
Electrical insulator
Production of one ton of cement requires about __________ tons of limestone.
0.6
1.2
2.2
3.8
Liquefaction of gases cannot be done by
Exchange of heat with colder stream
Adiabatic expansion through a throttle valve (Joule-Thomson expansion)
Merely compressing it beyond critical pressure
Adiabatic expansion against a piston or in a turbine
During the absorption of HCl gas in water (to produce liquid HCl), the gas is kept above dew point to
Increase the rate of absorption
Avoid corrosion
Reduce the cooling water circulation rate
None of these
Chloral is used in the manufacture of
DDT
BHC
Parathion
None of these
Nitrile rubber is produced by the polymerisation of
Acrylonitrile and butadiene
Acrylonitrile and styrene
Isobutylene and isoprene
None of these
Pick out the wrong statement.
Fibrillation of fibre during paper manufacture is done to develop the strength in paper
Alkali consumption in digestion/cooking of bamboo is measured in terms of permanganate number
Bagasse fibre contains both lignin & cellulose
Presence of sodium sulphate in pulp makes the pulp bleachability poor
Naphthalene is removed from coke oven gas by
Adsorbing on palladium
Absorbing in ethanolamine
Scrubbing with wash oil
Passing it through electrostatic precipitator
__________ is obtained as a by-product in the manufacture of sodium hydroxide using brine.
Chlorine
Ammonium chloride
Sodium carbonate
Sodium bi-carbonate
Synthesis gas is a mixture of
CO and H2
N2 and H2
H2, CH4 and CO
CO2 and H2
Litharge is
Lead oxide
Zinc oxide
Zinc sulphide
Cellulosic photographic material
The noble gas which occurs most abundantly in the atmosphere is
Helium
Neon
Krypton
Argon