Which glass is usually used in optical work?
Lead glass
High silica (borosilicate) glass
Photo-sensitive glass
Fibre glass
Correct Answer :
C. Photo-sensitive glass
Related Questions
Bakelite is
Same as Polytetrafluoroethylene (PTFE)
An inorganic polymer
Same as thermosetting phenol-formaldehyde
Not a polymer
Pick out the false statement pertaining to water treatment.
Aeration of water is effective in CO2 removal
The zeolite water softening process reduces the hardness of water by not more than 50%
Sodium sulphate or sodium carbonate do not cause hardness in water
Water with pH value less than 7, is acidic
Sucrose is a disaccharide consisting of
Glucose and glucose
Glucose and fructose
Glucose and galactose
Fructose and galactose
Temporary hardness of water can be removed by
Addition of alum (a coagulant)
Boiling
Filtration (through gravity sand filter)
Addition of lime
Soap cannot be used with hard water, because
Hard water contains sulphate
They form insoluble calcium soaps which precipitate
They attract back the removed dirt
None of these
Which of the following is used as a binding material in soap to improve soap texture?
Rosin
Borax
Benzyl acetate
Sodium carbonate
Salt is added in the kettle during soap manufacture to separate
Soap from lye
Glycerine from lye
The metallic soap
The unsaponified fat from soap
Sulphuric acid solution having a specific gravity of 1.20 at room temperature is used mainly for the
Fertiliser manufacture
Car battery solution
Synthesis of oleum
Water treatment
The product obtained on mixing calcium oxide with water is called
Quicklime
Slaked lime
Milk of lime
None of these
Which of the following is a constituent of vinegar?
Around 10% alcohol
Around 1% acetic acid
Both (A) and (B)
Neither (A) nor (B)
Pick out the wrong statement.
Cold rubber (SBR) is superior as compared to hot rubber (SBR)
Polymerisation temperature can modify the properties of SBR
Production of cold SBR employs lower pressure as compared to that of hot SBR
None of these
Which of the following is an unsaturated fatty acid?
Lauric acid
Palmitic acid
Stearic acid
Oleic acid
Pick out the wrong statement.
DDT is manufactured by the condensation of chlorobenzene with chloral at 30°C in presence of oleum, which is a highly exothermic reaction
Chloral is obtained by the chlorination of ethyl alcohol
Insecticides acting on the insects through the respiratory system are called fumigants
Benzene hexachloride is not a contact insecticide
Cumene is the starting material for the production of
Benzoic acid
Phenol and acetone
Isoprene
Styrene
Chemical name of aspirin (an analgesic drug) is
Acetylsalicylic acid
Nictonic acid
Calcium acetate
Methyl salicylate
High temperature carbonisation of coal takes place at __________ °C.
2000
700
1100
< 500
Paper pulp produced by Kraft/sulphate process is
Bleached easily
Dull white in color
Strong fibrous
Dark colored
Poly Tetrafluoroethylene (P.T.F.E.) is known as
Bakelite
Teflon
Celluloid
Dacron
Which of the following is an endothermic reaction?
Absorption of SO3 in 98% H2SO4
C + H2O = CO + H2
Thermal dissociation of iron pyrites
Both (B) and (C)
Presence of H2S in raw water (to be chlorinated) results in the
Reduced softening capacity of zeolite
Increased dosage of chlorine to provide a disinfecting residual in the water
Easy removal of its hardness
None of these
Which of the following is a constituent of coffee?
Caffeine
Nicotine
Calgon
Lignin
__________ is not a constituent of gun powder.
Carbon
Charcoal
Sulphur
Potassium nitrate
Paper grade bamboo contains about __________ percent cellulose.
5
20
40
60
Fire clay is __________ refractory material.
A basic
An acidic
A neutral
Not a
Starting material for the commercial production of ethyl alcohol in India is
Rice
Molasses
Fruit of Mahua tree
Maize
The major constituents of glass are
Lime, clay and soda ash
Sand, lime and soda ash
Silica, alumina and clay
Silica, alumina and soda ash
__________ acid is an unsaturated fatty acid.
Palmitic
Oleic
Stearic
Oxalic
Sea weeds are an important source of
Fluorine
Chlorine
Bromine
Iodine
Phosphate rock is a raw material for the manufacture of
Phosphoric acid
Phosphorous
Superphosphates
All (A), (B) and (C)
Sand and __________ is fused at 1300°C, to produce sodium silicate.
Limestone
Soda ash
Coke
Sodium sulphate