436. Temper brittleness of a material can be fairly detected by the __________ test.
A. Fatigue
B. Notched bar impact
C. Tensile
D. Hardness
✅ The correct answer is option B.
439. Electric arc furnace is employed mainly for the production of __________ steel.
A. High carbon
B. Alloy
C. Mild
D. Plain carbon
✅ The correct answer is option B.
442. The most commonly used moderator in nuclear power plants is
A. Graphite
B. Light water
C. Heavy water
D. Berellium
✅ The correct answer is option A.
445. Methyl orange indicator turns
A. Orange yellow in alkaline medium
B. Orange yellow in acidic medium
C. Colourless in acidic medium
D. Colourless in basic medium
✅ The correct answer is option A.
447. Cobalt – 60 is used as a source of __________ in medical therapy & industrial radiography.
A. X-rays
B. Γ-rays
C. Α-rays
D. Β-rays
✅ The correct answer is option B.
449. Holes for rivetting purposes should be preferably made by
A. Cutting torch
B. Drilling
C. Punching
D. None of these
✅ The correct answer is option B.
451. High __________ of cast iron makes it suitable for use in machine beds.
A. Compressive strength
B. Endurance strength
C. Damping capacity
D. Tensile strength
✅ The correct answer is option A.
455. It is possible to form martensite
A. Sometimes by cold working
B. Sometimes without nucleation
C. Sometimes by gas quenching
D. Only in iron based alloys
✅ The correct answer is option D.
419. Referring to the periodic table of elements, it is found that with increasing atomic number. The atomic size in the same
A. Period increases
B. Period decreases
C. Group increases
D. Both ‘b’ & ‘c’
✅ The correct answer is option D.