Alloys

Q. Steel is made from a combination of

1. Iron and Nickel
2. Iron and Cobalt
3. Iron and Carbon
4. Iron and Zinc

Q. Alloying is a very good method of improving the properties of a metal. Alloys are mixtures of metals with ___.

1. Non-metals
2. Metals
3. either A or B can be used
4. Neither A nor B can be used

Q. Which of the following are the characteristics of alloys with respect to the pure metal?

1. High melting point and low conductivity
2. Low melting point and low conductivity
3. High melting point and high conductivity
4. Low melting point and high conductivity

Q. When iron is alloyed with a non-metal, a hard substance called steel is formed. Identify the non-metal that is used here.

1. Carbon
2. Iron
3. Oxygen
4. Nickel

Q.

22-carat gold is preferred over 24-carat gold for making gold ornaments.

1. False

2. True

Q. Iron is mixed with carbon, nickel and chromium to form the alloy called ______.

1. brass
2. bronze
3. stainless steel
4. aluminium oxide

Q.

Amalgam is a homogeneous mixture of a____________.

1. metal and metal

2. metal and mercury

3. metal and non-metal

4. non-metal and non-metal

Q.

Which of the following is a ferrous alloy?

1. Solder

2. Steel

3. Magnalium

4. Brass

Q.

Duralumin is an alloy of __________.

1. Cobalt and Copper

2. Aluminium and Copper

3. Aluminium and Gold

4. Cobalt and Aluminium

Q. Which of the following homogeneous mixture forms amalgam?

1. Metal and non metal
2. Metal and mercury
3. Metal and graphite
4. Non metal and mercury