260. Reinforcing bars used in RCC slabs are made of
A.Cast iron
B.Wrought iron
C.Alloy steel
D.Medium carbon steel

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261. Eutectoid steels have structure of
A.Pearlite alone
B.Phases of ferrite and pearlite
C.Phases of cementite and pearlite
D.Phases of ferrite and cementite

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262. Typical examples of products produced by powder metallurgy are
A.Refractory metals like tungsten, molybdenum etc.
B.Super hard materials like cemented carbides
C.Bearings and porous metallic parts
D.All of the above

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263. Metal powder for powder metallurgy process is made by
A.Reduction of oxide
B.Electrolytic deposition
C.Milling or grinding
D.Anyone of the above

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264. Hypoeutectoid steels have structure of
A.Pearlite alone
B.Phases of ferrite and pearlite
C.Phases of cementite and pearlite
D.Phases of ferrite and cementite

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265. When steel with 0.8% carbon is cooled from temperature of 950°C the pearlite would occur at the following fixed temperature
A.910°C
B.850°C
C.770°C
D.723°C

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266. Copper and aluminium have tendency to absorb following gas at high temperature
A.CO2
B.N2
C.NH3
D.H2

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