291. Thermosetting plastic materials
Can be repeatedly melted
Is useful for melt casting
Can not be melted after forming
Is useful for spinning
✅ The correct answer is option C.
Chemical Process MCQs
292. Haemoglobin is a/an
Amino acid
Biological catalyst
Protein
Enezyme
✅ The correct answer is option C.
293. Phenol formaldehyde
Employs addition polymerisation
Employs condensation polymerisation
Is a monomer
Is an abrasive material
✅ The correct answer is option B.
294. Sodium carbonate (soda ash) is not used in the manufacture of
Fire extinguishers
Sugar
Baking powder
Detergents
✅ The correct answer is option D.
295. Temperature during hydrogenation of oil should not be more than 200°C, otherwise it will result in
Pyrolysis of oil
Sintering of porous catalyst
Hydrogen embrittlement
All of the above
✅ The correct answer is option D.
296. Tall oil obtained as a by-product from the black liquor recovery is
A black, sticky & viscous liquid
Used in the manufacture of greases, emulsions & soaps
Composed mainly of rosin & fatty acids
All of the above
✅ The correct answer is option D.
297. Which of the following is not a pyrite ore?
Celestite
Galena
Gypsum
Siderite
✅ The correct answer is option D.
298. Vegetable oils contain large quantity of glycerides of unsaturated acids. When the vegetable oils contain high amount of saturated fatty acids, it is termed as __________ oil.
Drying
Semi-drying
Non-drying
None of these
✅ The correct answer is option C.
299. Claude process of gas liquefaction employs
Merely compression of gas beyond its critical pressure
Joule-Thomson expansion cooling
Heat exchange with colder stream
Adiabatic expansion against a piston or in a turbine
✅ The correct answer is option D.
300. The catalyst used in the manufacture of DDT is
Alumina
Silica
20% oleum
Aluminium chloride
✅ The correct answer is option C.