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37.

In nodular iron, graphite is in the form of

A.	cementite	B.	free carbon
C.	flakes	D.	spheroids

38.

In malleable iron, carbon is present in the form of

A.	cementite	B.	free carbon
C.	flakes	D.	nodular aggregates of graphite.

39.

Wrought iron is

A.	hard	B.	high in strength
C.	highly resistant to corrosion	D.	least resistant to corrosion.

40.

Sulfur in pig iron tends to make it

A.	hard'	B.	soft
C.	ductile	D.	malleable.

41.

Pick up wrong statement about wrought iron

A.	It contains carbon of the order of 0 to 0.25%	B.	It melts at 1535°C
C.	It is very soft and ductile	D.	It is made by adding suitable percent¬age of carbon to molten iron and subjecting the product to repeated hammering and rolling.

42.

Iron is

A.	paramagnetic	B.	ferromagnetic
C.	ferroelectric	D.	none of the above.

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