Steel produced from phosphatic iron is __________ in nature.

Phosphatic fertiliser is graded based on its __________ content.

A

P₂O₃

B

PCl₅

C

P₂O₅

D

H₃PO₄

Phosphatic fertilisers

A

Are useful during early stage of the plant growth

B

Accelerate fruit formation in later stages of growth

C

Lessen the effect of excessive nitrogen application

D

None of these

Rock phosphate used for the production of phosphatic fertiliser is mined at

A

Amjhor (Jharkhand)

B

Talchar (Orissa)

C

Bailladella (M.P.)

D

Kiriburu (Bihar)

If you need 98 ounces of iron and 2 ounces of carbon to make a sheet of steel. How much iron you need in ounces to make 12 sheet steel?

A

98

B

50

C

49

D

198

__________ iron is produced by the annealing of white cast iron.

A

Malleable

B

Nodular

C

Ductile

D

Grey

__________ iron is produced, when molten pig iron is allowed to cool gradually.

A

White cast

B

Grey cast

C

Wrought

D

None of these

__________ iron is produced, when molten pig iron is chilled suddenly.

A

White cast

B

Grey cast

C

Wrought

D

None of these

Cast iron and steel pipes are produced by __________ casting.

A

Die

B

Investment

C

Slush

D

True centrifugal

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

Nodular cast iron is produced by adding ________ to the molten cast iron.

A

Nickel

B

Chromium

C

Copper

D

Magnesium

Steel produced from phosphatic iron is __________ in nature.

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