Which metal is protected by the layer of its own oxide ?
Which metal is protected by the layer of its own oxide ?
A. Iron
B. Silver
C. Calcium
D. Aluminium
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The increase in hardness of metal due to its cold working is termed as the _______________ hardening?
The increase in hardness of metal due to its cold working is termed as the _______________ hardening?A. Work
B. Age
C. Induction
D. FlameAcetaldehyde is shipped in ____________ drums?
Acetaldehyde is shipped in ____________ drums?A. Cast iron
B. Steel
C. Aluminium
D. Either B. & C.Which of the following is the easiest to bend ?
Which of the following is the easiest to bend ?A. Steel
B. Stainless steel
C. Cast iron
D. Wrought ironPresence of high amount of silicon in cast iron________________?
Presence of high amount of silicon in cast iron________________?A. Suppresses the decomposition of Fe3C
B. Increases the formation of graphite
C. Increases the contraction of the metal
D. Reduces its fluidityWhich of the following pairs of elements may form an alloy ?
Which of the following pairs of elements may form an alloy ?A. Iron & carbon
B. Iron & mercury
C. Platinum & mercury
D. None of theseSulphuric acid is mixed with ground phosphate rock (to produce phosphoric acid) in a steel digestor lined with______________?
Sulphuric acid is mixed with ground phosphate rock (to produce phosphoric acid) in a steel digestor lined with______________?A. Acidic refractory
B. Rubber
C. Karbate
D. Lead or acid proof bricks