981. Gratings is associated with the measurement of
A. Linear displacement
B. Concavity/convexity
C. Surface texture
D. Flatness
✅ The correct answer is option A.
Engineering
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982. Filler material used in welding having the lowest melting point out of the following is
A. Aluminium
B. Soft solder
C. Silver solder
D. Brazing spelter
✅ The correct answer is option B.
983. The atmospheric temperature during melting of ice/snow (in the atmosphere)
A. Decreases
B. Increases
C. Remains same
D. May increase or decrease ; depends on the altitude where snow melts
✅ The correct answer is option A.
984. Steel balls are manufactured by cold heading. After cold forming, they are subjected to
A. Tempering
B. Normalising
C. Stress-relieving
D. Artificial ageing
✅ The correct answer is option C.
986. Factor of safety in machine design is defined as the ratio of ultimate stress to __________ stress.
A. Working
B. Bearing
C. Yield
D. None of these
✅ The correct answer is option A.
987. __________ is the most important element, which controls the physical properties of steel.
A. Manganese
B. Silicon
C. Carbon
D. Vanadium
✅ The correct answer is option C.
988. A polymer is termed as an ‘elastomer’, if its percentage elongation is more than 100%. An elastomer is termed as ‘rubber’ if its percentage elongation is more than __________ percent.
A. 150
B. 200
C. 300
D. 400
✅ The correct answer is option B.
989. The size of the tetrahedral void in the closest packing of atoms is __________ that of the octahedral void.
A. Equal to
B. Greater than
C. Less than
D. Either A, B or C; depends on the size of atom
✅ The correct answer is option C.
990. Sub zero treatment of steel is done to
A. Suppress martensite transformation
B. Enhance its working performance in sub zero atmosphere
C. Reduce the retained austenite in hardened steel
D. Induce temper brittleness after its hardening
✅ The correct answer is option C.