246. Two Rockwell readings are 50 RC and 65 RC. What is the increment of penetration between the two readings
A.0.0012 inch more in first case
B.0.0012 inch more in second case
C.0.0006 inch less in first case
D.0.0006 inch less in second case

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247. Brinell tester uses a hardness steel ball of size
A.1 mm
B.5 mm
C.10 mm
D.15 mm

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248. Moh's scale has a range of
A.1 to 5
B.1 to 10
C.1 to 12
D.1 to 15

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249. The hardness number 10 on Moh's scale for hardness is assigned to
A.Quartz
B.Diamond
C.Topaz
D.Corundum

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250. The hardness number 1 on Moh's scale is assigned to
A.Quartz
B.Talc
C.Topaz
D.Corundum

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251. Charpy test is conducted to measure
A.Hardness
B.Fracture stress
C.Fatigue resistance
D.Brittleness

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252. The hardness of lathe bed material should be measured by
A.Rockwell tester
B.Brinell hardness tester
C.Shore Scleroscope
D.Vickers hardness tester

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