Solder is an alloy of

Solder metal is an alloy of

A

Lead and tin

B

Lead and antimony

C

Copper and zinc

D

Copper and tin

Solder is an alloy consisting of

A

Tin, antimony, copper

B

Tin and copper

C

Tin and lead

D

Lead and zinc

There are n students in a school . If r% among the students are 12 years or younger, which of the following expressions represents the number of students who are solder than 12?

A

n(1-r)

B

n ( 100-r) /100

C

n(1-r)/100

D

100(1-r)n

The composition of silver solder is

A

Silver, copper, zinc

B

Silver, tin, nickel

C

Silver, lead, zinc

D

Silver, copper, aluminium

_______ is a hard solder.

A

Tin-lead

B

Tin-silver-lead

C

Copper-zinc

D

None of the above

Silver based solder is used for

A

Flaring

B

Brazing

C

Soft soldering

D

Fusion welding

Perminvar alloy having constant permeability is an alloy of

A

Nickel, copper and iron

B

Nickel, copper and zinc

C

Copper, nickel and antimony

D

Iron, zinc and bismuth

The partial pressure of each constituent present in an alloy is __________ the total vapor pressure exerted by the alloy.

A

Less than

B

Equal to

C

More than

D

Either B or C; depends on the type of alloy

Constantan an alloy used in thermocouples is an alloy of

A

Copper and tin

B

Copper and zinc

C

Copper and iron

D

Copper and nickel

What is an alloy?

A

Metals melted in liquid form.

B

Industrial meterials which are not very good

C

A planned combination of materials for a specifice purpose.

D

Impure materials that occur accidentally.

Solder is an alloy of

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