GATE Metallurgical Engineering Previous Year Papers Pdf - 2

Question: 6

A p-type germanium semi-conductor is doped with

(A) Selenium

(B) Silicon

(C) Arsenic

(D) Gallium

Question: 7

Which of the following materials does not form adherent oxide film on surface?

(A) Copper

(B) Nickel

(C) Gold and silver

(D) Aluminium

Question: 8

Cast cobalt alloys typically contain which of the following main ingredient?

(A) Aluminium

(B) Chromium

(C) Cobalt

(D) Tungsten

Question: 9

Which one of the following metals has the lowest density?

(A) Magnesium

(B) Tin

(C) Copper

(D) Aluminium

Question: 10

Which of the following materials has the poorest electrical conductivity?

(A) Stainless steel

(B) Silver

(C) Carbon

(D) Aluminium