METALS MCQ 3
2) As compared to copper, the conductivity (both thermal and electrical) of aluminium is about
39%
49%
59%
69%
Correct Answer- (C)
1) As compared to steel, the density of aluminium is about
half
one-third
one-fourth
one-fifth
Correct Answer- (D)
3) What is produced when aluminium is oxidized by water?
Hydrogen
Oxygen
Nitrogen
Carbon dioxide
Correct Answer- (A)
4) Which of the following can penetrate the protective skin of aluminium and corrode the metal?
Acidic substances
Alkaline substances
Both (a) and (b)
Neither (a) nor (b)
Correct Answer- (B)
6) Which one of the following metals is most impervious to X-rays and gamma radiation?
Lead
Zinc
Gold
Tin
Correct Answer- (A)
7) The principal constituent of solder is
Zinc
Lead
Tin
Antimony
Correct Answer- (C)
8) Which one of the following is used in heat exchangers (radiators)?
Brass
Bronze
Duralumin
Phosphor bronze
Correct Answer- (A)
9) Which one of the following has suitable acoustic properties for use in musical instruments?
Bronze
Muntz metal
Gilding metal
Brass
Correct Answer- (D)
10) Galvanizing is providing a protective coating on mild steel of the metal
zinc
lead
tin
aluminium
Correct Answer- (A)
11) Which of the following metals is used in batteries?
zinc
lead
tin
copper
Correct Answer- (B)
12) Stainless steel contains chromium, minimum percentage
6.5%
10.5%
14.5%
18.5%
Correct Answer- (B)
13) Which type of stainless steel is used for making knives and turbine blades?
Duplex
Ferritic
Austenitic
Martensitic
Correct Answer- (D)
14. Two dissimilar metals are connected in a corrosive electrolytic environment. The type of corrosion likely to occur is
pitting corrosion
galvanic corrosion
Crevice corrosion
Graphitic corrosion
Correct Answer- (B)
15) Which one among the following metals is most corrosive?
Tin
Lead
Zinc
Magnesium
Correct Answer- (D)
16) Which one among the following metals is least corrosive?
Gold
Silver
Stainless steel
Aluminium
Correct Answer- (A)
17) Which one among the following is NOT considered “noble”?
Gold
Silver
Tin
Graphite
Correct Answer- (C)
18) In the process of calorising, which type of powder is used for protection against corrosion?
Aluminium powder
Zinc powder
Tin powder
Lead powder
Correct Answer- (A)
19. Which one of the following processes involves pressing or rolling sheets together under high pressure?
Calorising
Sherardising
Lacquering
Cladding
Correct Answer- (B)
20) In the process of sherardising, which type of powder is used to form a corrosion resistant coating?
Aluminium powder
Zinc powder
Tin powder
Lead powder
