721. The process of manufacturing steel by heating short lengths of wrought iron bars mixed with charcoal in fire clay crucibles and collecting the molten iron into moulds, is known as
A. Cementation process
B. Crucible process
C. Bessemer process
D. Open hearth process.

722. Softer variety of steel may be obtained by
A. Cementation process
B. crucible process
C. Bessemer process
D. Open hearth process.

723. The steel which contains fissures and cavities, manufactured by
A. Cementation process
B. Crucible process
C. Bessemer process
D. Open hearth process.

724. Cast steel is manufactured by
A. Cementation process
B. Crucible process
C. Bessemer process
D. Open hearth process.

725. Blister steel
A. is obtained by cementation process
B. is full of fissures and cavities
C. can not be forged
D. all the above.

726. For high grade instruments the steel preferred to, is
A. cast steel
B. bessemer steel
C. mild steel
D. whitworth compressed steel.

727. The steel used in R.C.C. work is
A. stainless steel
B. mild steel
C. high carbon steel
D. wrought iron.

728. The steel used for the manufacture of rails, is
A. Bessemer steel
B. mild steel
C. cast steel
D. stainless steel.

729. Whitworth compressed steel is obtained when molten steel is subjected to a pressure of
A. 5 kg/mm2
B. 9 kg/mm2
C. 13 kg/mm2
D. 15 kg/mm2

730. Assertion A : Intervention of undulations in the sea bed reduces the depth of wave at the section. Reason R : No wave can have a height greater than the depth of water through which it passes?
A. Both A and R are true and R is correct explanation of A.
B. Both A and R are true but R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true

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