Mineral oils (e.g. petroleum oils) are preferred over fatty oils (e.g. mustard oil, ghee, tallow, palm oil, olive oil etc.) as a lubricant due to its
Poor oxidation stability and high gum forming tendency
Greater tendency of decomposition at elevated temperature
Hydrolysis tendency in presence of water
All (A), (B) and (C)
Correct Answer :
D. All (A), (B) and (C)
Related Questions
Ethanol amine is produced using ammonia and
Ethyl benzene
Ethylene oxide
Ethanol
Ethane
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
Styrene is produced from ethyl benzene by the process of
Dehydrogenation
Oxidation
Alkylation
Dehydration
__________ paper is used in the manufacture of newsprint paper.
Ground-wood
Board
Tissue
Wrapping
Alcohol percentage in molasses may be around
10
40
70
85
Linde process of gas liquefaction employs
Exchange of heat with colder stream
Adiabatic expansion through a throttle valve (Joule-Thomson expansion)
Adiabatic expansion against a piston or in a turbine
Merely compressing the gas beyond its critical pressure
The catalyst used in shift converter is
Nickel
Vanadium
Silica gel
Alumina
Bleaching action of bleaching powder is due to its __________ properties.
Reducing
Oxidising
Disinfecting
None of these
Naphthols are derivates of
Methyl amine
Naphthalene
Phenol
Xylene
__________ is the major constituent of the Portland cement.
Calcium carbonate
Calcium oxide
Tricalcium silicate
Calcium sulphate
Oils are partially hydrogenated (not fully) to manufacture Vanaspati, because fully saturated solidified oils
Cause cholesterol build up and blood clotting
Are prone to rancid oxidation
Always contain some amount of nickel (as their complete removal is very difficult)
Have affinity to retain harmful sulphur compounds
Polymerisation product of C2F4 (carbon tetrafluoride) is called P.T.F.E (poly chloro tetra fluoro ethylene). It is also called
Polyurethane
Silicone
Teflon
Epoxy resin
Pick out the wrong statement pertaining to the soap manufacture.
Transparent soaps are made by cold process
Organic pigments are used as colouring materials in the soap manufacture
Both laundry as well as toilet soaps are manufactured by hot process
Colourless rosin is used in the manufacture of laundry soaps
The catalyst used in the production of elemental sulphur from H2S (by oxidation-reduction) is
Alumina
Silica gel
Platinum
Nickel
Ore concentration by froth floatation utilises the __________ of ore particles.
Density difference
Wetting characteristics
Terminal velocities
None of these
Percentage of alcohol in beer may be around __________ percent.
2-8
18-23
27-32
1-4
Varnish does not contain
Thinner
Pigment
Both (A) & (B)
Neither (A) nor (B)
Basic oxide is absent in __________ glass.
Flint
Pyrex
Quartz
All (A), (B) & (C)
A good quality coal should have
Low fusion point of ash
High ash content
High sulphur content
None of these
Setting of plaster of Paris is accompanied with
Hydration
Dehydration
Hydrolysis
Loss of CO2
Calcination of gypsum produces
Plaster of Paris
Salt cake
Nitre cake
Lime
Which of the following is not an insecticide?
Hydrocyanic acid
Nicotine
Sodium fluoride
Hexane
Parathion and Malathion are
Pesticides
Plasticisers for unsaturated polyesters
Pain-relieving drugs (analgesic)
Tranquilisers
Commercial scale production of hydrogen from iron-steam reaction represented by, 3Fe + 3H2O = Fe3O4 + 4H2, is not practised, as it is
A slow reaction
A discontinuous reaction (requiring regeneration of iron by water gas intermittently)
Still in development stage (by employing fluidised bed technique)
All (A), (B) and (C)
Pick out the wrong statement.
Low intensity explosives are also called propellants, whereas high intensity explosive are called detonators
Gun powder comprises of 75% salt petre, 15% charcoal and 10% sulphur
Lead azide is a popular military explosive
TNT is a hygroscopic explosive having very high melting point and is non-toxic to human being
Hydrophilic group of a soap or detergent solution is
Water hating
Soil loving
Water loving
None of these
Yellow glycerine is made into white, using
Activated carbon
Diatomaceous earth
Bauxite
Bentonite
Resistance to fusion of the refractory under a steady rising temperature condition is called
Spalling
Refractoriness
Both (A) & (B)
Neither (A) nor (B)
Sand and __________ is fused at 1300°C, to produce sodium silicate.
Limestone
Soda ash
Coke
Sodium sulphate
Shaving soaps are
Soft potassium soaps (potassium salt of fatty acid) with free Stearic acid to give lather a lasting property
Metallic soaps compounded with frothing agents
High free alkali soaps having excess of cane sugar and alcohol
None of these