101. Carbon supply in pack carburising process is in the form of
A. Charcoal
B. Calcium carbide
C. Hydrocarbon oil
D. Graphite
✅ The correct answer is option A.
Chemical Engineering
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102. ‘Sterilised zone’ around a hazardous chemical industry is an area with __________ km radius around it, in which the total population/inhabitants should be less than 20000 preferably in the upwind direction.
A. 0.5
B. 5
C. 25
D. 50
✅ The correct answer is option B.
103. Yield strength of a polycrystalline metal with an average grain size, d, is proportional to
A. d1/2
B. d-1/2
C. d
D. d-1
✅ The correct answer is option B.
104. When an isolated thermodynamic system executes a process,
A. Work is done
B. Heat transfer takes place
C. Mass flow occurs across the boundary of the system
D. No chemical reaction takes place within the system
✅ The correct answer is option D.
105. Silicon percentage in the silicon steel used for electrical appliances/equipments is
A. 0.3-0.4
B. 12-14
C. 3-4
D. 20-25
✅ The correct answer is option C.
106. Which of the following is not the commercial name of polymethyl-methacrylate (PMMA)?
A. Styrofoam
B. Lucite
C. Perspex
D. Plexiglass
✅ The correct answer is option A.
107. Pick out the correct statement
A. Jet engine can work, where there is no atmosphere
B. Rocket engines cannot work, where there is no atmosphere
C. Rocket engines carry oxygen required for the combustion in the form of oxidiser
D. Jet engines also carry oxidiser
✅ The correct answer is option C.
108. Joule-Thomson co-efficient is the ratio of
A. Pressure change to temperature change occuring during adiabatic compression of a gas
B. Pressure change to temperature change occuring during adiabatic throttling of a gas
C. Temperature change to pressure change occuring during adiabatic compression of a gas
D. Temperature change to pressure change occuring during adiabatic throttling of a gas
✅ The correct answer is option D.
109. Filler material used in welding should have __________ as compared to the parent metal to be welded.
A. Lower melting temperature
B. Same melting temperature
C. Same composition
D. Both B & C
✅ The correct answer is option D.
110. Neutrons are present in all atoms except that of
A. He
B. C
C. H
D. Ar
✅ The correct answer is option C.