1075. Strain hardening effect in a metal subjected to cold working is due to the __________ mechanism.
A. Fracture
B. Dislocation
C. Slip
D. Twinning
✅ The correct answer is option C.
1078. Cassiterite is an ore of
A. Tin
B. Lead
C. Molybdenum
D. Chromium
✅ The correct answer is option A.
1081. Nuclear fission of one atom of uranium⁻²35 produces the energy equivalent to about __________ MeV.
A. 20
B. 200
C. 500
D. 1000
✅ The correct answer is option B.
1084. The increase in hardness of metal due to its cold working is termed as the __________ hardening.
A. Work
B. Age
C. Induction
D. Flame
✅ The correct answer is option C.
1087. Sudden fall of atmospheric pressure by a large amount is an indication of the
A. Rain
B. Cold wave
C. Storm
D. Fair weather
✅ The correct answer is option C.
1090. Midrex process of sponge iron production uses reformed natural gas as the reducing agent, which uses iron ore in the form of
A. Lumps
B. Pellets
C. Briquettes
D. Sinter
✅ The correct answer is option B.
1053. The maximum percentage of chromium that can be added to steel is about
A. 12
B. 18
C. 24
D. 30
✅ The correct answer is option B.
1055. Compressed dry air is used as the cutting fluid, while machining
A. Steel
B. Cast iron
C. Aluminium
D. None of these
✅ The correct answer is option B.
1057. The velocity at which individual particles from a fluidised bed are carried away by the fluid passing through it, is defined as the
A. Minimum fluidisation velocity
B. Terminal velocity
C. Elutriation velocity
D. Superficial velocity
✅ The correct answer is option C.
1059. Castability of aluminium is increased by the addition of __________ in it.
A. Silicon
B. Manganese
C. Bismuth
D. Lead
✅ The correct answer is option A.