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Multiple Choice Question (MCQ) of Battery page-19


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181. Aluminium is produced from bauxite by

A) froth flotation
B) rotating
C) oxidation
D) electrolytic process.

Ans : (D)

182. Aluminium surface in contact with air is always cover with a thin layer of

A) oxide
B) hydrate
C) carbide
D) nitride.

Ans : (A)

183. Uniform thickness of plating on irregular surface is assisted by

A) keeping the anode and cathode closer
B) keeping the anode and cathode farther apart
C) constantly agitating the electrolyte
D) using high current densities.

Ans : (B)

184. Which of the flowing coating is used for bearing surface?

A) Gold coating
B) Iron coating
C) Zinc coating
D) Lead coating.

Ans : (D)

185. Which metal is deposited for electro-forming?

A) Iron
B) Chromium
C) Nickel
D) Silver.

Ans : (A)

186. Which of the flowing metal is deposited to provide hard wearing surface?

A) Nickel
B) Bronze
C) Zinc
D) Chromium.

Ans : (D)

187. Which of the flowing metal is deposited to provide an undercoat for chromium?

A) Silver
B) Bronze
C) Copper
D) Lead.

Ans : (B)

188. Silver coating is provided for

A) protective purposes
B) decorative purposes
C) bearing surfaces
D) all of the above.

Ans : (D)

189. The character of metal deposited is affected by

A) temperature
B) metal concentration
C) current density
D) all of the above.

Ans : (D)

190. Oils and greases from surfaces to be coated can be removed by the help of

A) soaps
B) hot alkali solutions
C) solvents like C.T.C. and gasoline
D) any of the above.

Ans : (D)

191. Rust, scale and oxides can be removed with the help of

A) mechanical abrasion
B) alkali salt solutions
C) various acids
D) any of the above.

Ans : (D)

192. Which of the flowing substance when added to electrolyte promotes smooth deposition?

A) Glucose
B) Albumen
C) Gelatin
D) Any of the above.

Ans (D)

193. The character of meter deposited is affected by

A) surface preparation
B) structure of the metal
C) metal-ion concentration
D) all of the above.

Ans : (D)

194. Addition of which of the following substance in electrolyte helps in producing bright finish?

A) Phenol
B) Dextral
C) Glycerine
D) Any of the above.

Ans : (D)


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