High School: 9th and 10th Grade - Chemistry - Chemistry - Alloys Solution - MCQGeeks.com

Q.1.

Why are 'silver' coins made from an alloy or nickel plated steel and not from silver?

0%
Silver is too valuable
0%
People would keep silver coins instead of spending them
0%
It is too difficult to get silver into the right size and shape
0%
Silver is too soft

Q.2.

Brass is an alloy of 70 per cent copper and 30 per cent zinc. Which of the following is a use of brass?

0%
In electrical fittings
0%
In boat fittings
0%
In aircraft frames
0%
In musical instruments

Q.3.

Which of the following is a use of ?

0%
Cutting tools
0%
Car body panels
0%
Furniture
0%
None of the above

Q.4.

Why does iron directly from a blast furnace have limited usefulness?

0%
It is too hot
0%
It is in the form of a big ingot
0%
It contains about 4% impurities, including carbon
0%
It is too soft

Q.5.

What is an alloy?

0%
A mixture of metals
0%
A mixture of non-metals
0%
A mixture of a metal with either non-metals or other metals
0%
A pure metal that has been shaped in a certain way

Q.6.

Which of the following is a reason for making an alloy?

0%
To make a material that is transparent to light waves
0%
To make a corrosion resistant material
0%
To make a harder material
0%
To make a more malleable material

Q.7.

Aluminum is a light metal but why is it not used to make aircraft?

0%
It is too brittle
0%
It corrodes too easily
0%
It is too weak
0%
It conducts electricity

Q.8.

How is the percentage of carbon in pig iron reduced to form steels?

0%
By burning it off using oxygen
0%
By filtering it out
0%
By dissolving it in sulfuric acid
0%
By scraping it off the surface of the metal

Q.9.

Why are alloys stronger than the materials from which they are made?

0%
They contain different sized atoms that 'lock' the structure
0%
This is only true if you use a strong metal with a weak one
0%
They form a chemical compound
0%
The heat needed to make them gives alloys their greater strength

Q.10.

Which of the following is a use of ?

0%
Boat fittings
0%
Aircraft body panels
0%
Cables for large cranes
0%
All of the above