1. X-rays are typically powerful compared to gamma-rays which are weaker than X-rays.
a) True
b) False
Explanation: This statement is incorrect. X-rays are not stronger compared to gamma-rays. In fact, the contrary is true. X-rays are weak compared to gamma-rays, due to which gamma-rays can be used to inspect materials of greater thickness
2. One of the disadvantages of radiography is that it is ___________
a) destructive
b) faster
c) temporary record
d) time-consuming
Explanation: There are a lot of advantages and disadvantages of standard inspection methods. When it comes to radiography, one of the disadvantages is that it can be time-consuming. It also needs photography.
3.Fluoroscopy requires a higher voltage compared to radiography.
a) True
b) False
Explanation: The above statement is true. Fluoroscopy is a method of non-destructive inspection that has been developed after radiography. It requires a higher voltage compared to radiography to perform.
4. ___________ is an inspection method for magnetic objects
a) Fatigue
b) Magnaflux
c) Gammagraphs
d) Bending
Explanation: The inspection method is performed on magnetic objects and used to determine cracks, laps, etc. On the material or part being inspected is called as magnaflux. Bending and fatigue are not inspection methods
5. X-rays being used to produce radiographs are called ____________
a) Radiographs
b) Magnaflux
c) Exographs
d) Gammagraphs
Explanation: The inspection method of radiography can be performed in two ways. Either using gamma-rays called Gammagraphs or made by passing X-rays through the material being inspected, which are called exographs.
6.The primary commercial source for aluminium is ____________
a) coal
b) bauxite
c) magnetite
d) pyrite
Explanation: Aluminium can be obtained from several sources. For example, it is found in several clays and rocks. But the primary source for aluminium is bauxite ores. Bauxite contains aluminium and some impurities.
7. Aluminium weighs around __________ of steel.
a) 2 times
b) 1/2
c) 1/3
d) 4 times
Explanation: One of the most important advantages of aluminium is its weight. Aluminium weighs less than steel. But steel is stronger compared to aluminium. Steel weighs almost three times the weight of aluminium.
8. A ____________ process is carried out to get aluminium from the oxide alumina.
a) electrolytic
b) dynamite
c) chromatography
d) bakelite
Explanation: Aluminium is often found in the ore bauxite. But, it is found along with a lot of impurities. Therefore, a chemical process purifies it to alumina after which it is subjected to an electrolytic process
9. Which of the following are shapes used in the manufacturing of an aircraft?
a) X-section
b) U-section and Z-section
c) X-section and Z-section
d) U-section
Explanation: There are several shapes required to manufacture the structure of an aircraft. Some of the shapes are Z-section, U-section, bars, sheets and tubing. X-section is not a shape used in the construction of an aircraft.
10. The aluminium association has a designation system for aluminium alloys which are denoted by __________ digits.
a) 23
b) 2
c) 9
d) 4
Explanation: The aluminium association has a designation system for aluminium alloys that are denoted by four digits. The four digits of numbers represent different parameters of the material, aluminium alloys.