Alloys

Q.

What is the composition of stainless steel?

Q.

Brass is an alloy of :

(a) Copper and tin, (b) Copper and zinc,

(c) Zinc and lead, (d) Lead and tin.

Q. What is the purpose of alloying?

Q.

How many carats is pure gold? why is pure gold not suitable for making ornaments?

Q.

What is an amalgam?

Q.

Which of the following alloys contains a non-metal as one of the constituents?
(a) brass (b) amalgam (c) steel (d) bronze

Q.

Duralumin is an alloy of __________.

1. Cobalt and Copper

2. Aluminium and Copper

3. Aluminium and Gold

4. Cobalt and Aluminium

Q.

Name an alloy of lead and tin.

Q.

Name two alloys of iron. What elements are present in these alloys?

Q.

Give the composition of brass.

1. Cu and Fe

2. Cu and Zn

3. Cu and Al

4. Fe and Zn

Q.

Solder is an alloy of:

1. Lead and tin

2. Iron and copper

3. Copper and tin

4. Copper and zinc

Q.

Give reason: Generally, for making gold ornaments, 22-carat gold is preferred over 24-carat gold. [2 MARKS]

Q.

In stainless steel alloy, iron metal is mixed with:
(a) Cu and Cr (b) Cr and Ni (c) Cr and Sn (d) Cu and Ni

Q.

What are the components present in gun powder?

Q.

An alloy of iron, chromium and nickel is:

1. Brass

2. Solder

3. Stainless steel

4. Bronze

Q. Steel is an alloy of iron and carbon.

1. True
2. False

Q.

Write the composition of the alloy called bronze. Give two uses of bronze.

Q.

When iron is mixed with carbon. nickel and chromium, the alloy formed is:

1. Anodised iron
2. Stainless steel
3. Aluminium oxide
4. Brass

Q. The purest form of commercial iron is

1. Scrap iron and pig iron
2. Cast iron
3. Wrought iron
4. Pig iron

Q.

Which of the following is an alloy of a metal and a non metal?

1. Magnalium

2. Steel

3. Brass

4. Bronze

Q.

Brass is an alloy of:
(a) Cu and Sn (b) Cu and Pb (d) Zn and Cu

Q.

Give the composition of an alloy called solder. State its one property and one use.

Q.

Why is gold mixed with other metals for making jewellery? Name two metals mixed with gold.

Q.

(a) Name an alloy of copper. State its chemical composition and anyone use.
(b) Name five methods of preventing rusting of iron.
(c) What are the constituents of stainless steel? What are the special properties of stainless steel?

Q.

What are the elements present in stainless steel?

1. Fe, C, Ni, Cr

2. Fe, C, Ni, Cr

3. Al, Cu, Mg

4. Al, Mg, Mn, Cu

Q.

(a) What is an alloy? How is an alloy made?
(b) What elements are present in steel? How are the properties of steel different from those of pure iron?
(c) Give the constituents and one use of brass.

Q.

Why is bronze preferred over copper metal for making statues?

Q.

What is the meaning of Cu/Zn couple?

Q.

Which property of 'solder' alloy makes it suitable for welding electrical wires?

Q. Why alloys are more better than metals ?