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11.

The presence of impurities in iron

A.	lowers the melting point	B.	raises the melting point
C.	has no effect on melting point	D.	makes iron malleable

12.

An alloy is

A.	an intermetallic compound	B.	a solid substance containing two or more metallic elements
C.	a metallic material containing at least one metallic element	D.	a metallic material containing at least one non-matallic element

13.

Metalloid is

A.	an alloy	B.	an element which exhibits properties of metal and non-metal both
C.	highly electronegative	D.	highly electropositive

14.

A substance is said to be malleable if it

A.	does not react with acids and alkalies	B.	can be hammered to thin sheets
C.	has a very high melting point	D.	has a metallic lustre

15.

The property of metals olloys which describes its ability to be drawn into wires is known as

A.	tenacity	B.	dustility
C.	porosity	D.	malleability

16.

Brittleness of a substance is a property of substance which describes its

A.	shining	B.	ability to be polished
C.	ability to be drawn into wires	D.	tendency to fracture without appreciable deformation

17.

The tempering of steel makes it

A.	hard	B.	soft
C.	heavy	D.	brittle

18.

Nitriding of steel is done for

A.	hardening the surface of steel	B.	hardening the steel
C.	softening the steel surface	D.	softening the steel

19.

Nitriding of steel is done in an electric furnace kept at about

A.	1700?C	B.	2200?C
C.	510?C	D.	125?C

20.

Select the correct statement

A.	Stainless steel is chromium plated iron	B.	German silver does not contain silver
C.	Brass is an alloy of copper and tin	D.	Bronze is an alloy of copper and zinc