A. Least active
B. Most stable
C. Most active
D. Most noble
Related Mcqs:
- Which one occupies the lowermost position in the electromotive series of metals ?
A. Aluminium
B. Noble metals (Ag, Pt, Au)
C. Zinc
D. Alkali metals (K, Na, Li) - The metals occuring at the lower most position in the electromotive series____________________?
A. Do not resist corrosion
B. Resist corrosion very strongly
C. Are very brittle
D. Are heat insulators - Gun metal is an alloy of_________________________?
A. Nickel, tin and copper
B. Copper, tin and zinc
C. Copper, phosphorus and nickel
D. Manganese, phosphorus and nickel - Which of the following is a low melting point metal ?
A. Stainless steel
B. Wrought iron
C. Tin
D. Copper - Monel metal is an alloy of__________________?
A. Molybdenum and nickel
B. Nickel and copper
C. Molybdenum and aluminium
D. Molybdenum and zinc - Babbitt metal used for bearings is a ____________base alloy?
A. Tin
B. Lead
C. Aluminium
D. Copper - Which of the following is universally employed as the low expansion metal in the bimetallic thermometer, which is an iron-nickel alloy containing 36% nickel and has very low co-efficient of expansion (1/20th of ordinary metals) ?
A. Invar
B. Constantan
C. Chromel
D. Alumel - The temperature at which new grains are formed in the metal is called the ______________ temperature?
A. Eutectic
B. Recrystallisation
C. Upper critical
D. Lower critical - Babbitt metal is not a___________________________?
A. Tin base alloy
B. White metal
C. Lead base alloy
D. Pure metal - Babbitt metal used for making bearings should have_____________________?
A. High co-efficient of friction between journal and bearing
B. Ability to retain lubricant on its surface
C. Low co-efficient of friction between journal and bearing
D. Both B. & C.
