Q. Steel is made from a combination of
- Iron and Nickel
- Iron and Cobalt
- Iron and Carbon
- Iron and Zinc
Q. Alloying is a very good method of improving the properties of a metal. Alloys are mixtures of metals with
- either A or B can be used
- Neither A nor B can be used
Q. Which of the following are the characteristics of alloys with respect to the pure metal?
- High melting point and low conductivity
- Low melting point and low conductivity
- High melting point and high conductivity
- 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.
22-carat gold is preferred over 24-carat gold for making gold ornaments.
Q. Iron is mixed with carbon, nickel and chromium to form the alloy called ______.
- stainless steel
- aluminium oxide
Amalgam is a homogeneous mixture of a____________.
metal and metal
metal and mercury
metal and non-metal
non-metal and non-metal
Which of the following is a ferrous alloy?
Duralumin is an alloy of __________.
Cobalt and Copper
Aluminium and Copper
Aluminium and Gold
Cobalt and Aluminium
Q. Which of the following homogeneous mixture forms amalgam?
- Metal and non metal
- Metal and mercury
- Metal and graphite
- Non metal and mercury