Question

The properties of the four elements are shown. Which element is used to make aircraft bodies?
Element 1- Density – high, brittle or malleable - brittle
Element 2- Density – high, brittle or malleable - malleable
Element 3- Density – low, brittle or malleable - brittle
Element 4- Density – low, brittle or malleable - malleable

Answer 1

Hint: The bodies of the aircraft should be made with the elements which are strong, light, etc and the element must be easily converted into sheets on hammering. Find out these three properties from the option and that will be your correct one.

Complete step by step answer:
The elements which are used for making the bodies of the aircraft must be lightweight and strong, which means the density of the element must be low.
The elements used for making the aircraft bodies must easily be converted into sheets by hammering or rolling. Hence the element must be malleable.\

Hence the correct answer is an option (d)- Element 4- Density – low, brittle or malleable - malleable.

Additional information:
The bodies of aircraft are mostly made with aluminium or aluminium alloys. Aluminium has properties like strong, lightweight, inexpensive, and predictable which makes it perfect for the manufacturing of aircraft. Around 80% of today's modern-day aircraft is made up of aluminium. Since the aluminium metals get easily corroded that's why many alloys of aluminium are developed for making the bodies of aircraft. Alloys of aluminium with molybdenum and titanium are developed for this use.

Note: We could use steel and iron instead of aluminium because both of them are stronger than the aluminium. But the problem is that they are heavy metals and due to their weight the ability of the aircraft gets restricted.