98. Square steel key is normally strong in failure by shear & crushing. Keys are normally made of __________ steel bars.
A. Hot rolled mild
B. Cold rolled mild
C. Forged
D. Machinable stainless
✅ The correct answer is option B.
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.
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.
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.
110. Neutrons are present in all atoms except that of
A. He
B. C
C. H
D. Ar
✅ The correct answer is option C.
74. For the running of power generating turbines, the steam used should be
A. Wet
B. Superheated
C. At ordinary pressure
D. None of these
✅ The correct answer is option B.
76. Minimum number of members required to form a Public Limited Joint Stock Company is
A. 7
B. 10
C. 12
D. 17
✅ The correct answer is option A.
78. No cutting fluid is normally used, while machining
A. Cast iron
B. Aluminium
C. Mild steel
D. Stainless steel
✅ The correct answer is option A.
80. Electrochemical corrosion can occur, only if __________ is present in contact with metal.
A. Air
B. Oxygen
C. Liquid medium
D. Gaseous medium
✅ The correct answer is option C.
82. The tensile strength of plastics ranges from __________ kg/mm².
A. 10 to 50
B. 50 to 100
C. 0.01 to 0.1
D. 0.1 to 10
✅ The correct answer is option D.