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MCQs

Total Questions : 204 | Page 9 of 21 pages
Question 81. Metal core in power cable is normally made up of
  1.    steel
  2.    sulphur
  3.    phosphorus
  4.    mercury
 Discuss Question
Answer: Option A. -> steel
Answer: (a).steel
Question 82. Least reactive metal in given series is
  1.    zinc
  2.    tin
  3.    lead
  4.    iron
 Discuss Question
Answer: Option C. -> lead
Answer: (c).lead
Question 83. Common cutlery is manufactured through electrolysis of
  1.    nickel
  2.    galvanized zinc
  3.    chromium
  4.    copper
 Discuss Question
Answer: Option A. -> nickel
Answer: (a).nickel
Question 84. In electrolysis of dilute HCl, at cathode
  1.    oxygen gas is given off
  2.    hydrogen gas is given off
  3.    chlorine gas is given off at anode
  4.    hydrogen chloride is given off
 Discuss Question
Answer: Option B. -> hydrogen gas is given off
Answer: (b).hydrogen gas is given off
Question 85. Difficulty of discharge is highest in
  1.    hydroxide ions
  2.    bromide ion
  3.    nitrate ion
  4.    chloride ions
 Discuss Question
Answer: Option C. -> nitrate ion
Answer: (c).nitrate ion
Question 86. In a dry cell, electrolyte paste is formed of
  1.    ammonium sulphate
  2.    ammonium nitrate
  3.    ammonium chloride
  4.    zinc sulphate
 Discuss Question
Answer: Option C. -> ammonium chloride
Answer: (c).ammonium chloride
Question 87. Electrodes refer to the
  1.    switches in a battery
  2.    the metal plates carrying electricity in the liquid
  3.    cathode
  4.    anode
 Discuss Question
Answer: Option B. -> the metal plates carrying electricity in the liquid
Answer: (b).the metal plates carrying electricity in the liquid
Question 88. Oxidation of Hydrogen Gas (H₂) to prevent polarization occurs through
  1.    paste of mangese oxide
  2.    depolarizing mixture of manganese oxide and ammonium chloride
  3.    powdered carbon
  4.    carbon acting as the negative terminal
 Discuss Question
Answer: Option B. -> depolarizing mixture of manganese oxide and ammonium chloride
Answer: (b).depolarizing mixture of manganese oxide and ammonium chloride
Question 89. Impurities like silver and gold are found in anode of
  1.    Magnesium
  2.    Copper
  3.    Graphite
  4.    Carbon
 Discuss Question
Answer: Option B. -> Copper
Answer: (b).Copper
Question 90. In a Magnesium-Copper battery with dilute acid as electrolyte, at cathode, element is
  1.    hydrogen gas is bubbled off
  2.    electrons are produced
  3.    copper takes up the electrons produced by magnesium
  4.    Chlorine gas is bubbled off
 Discuss Question
Answer: Option A. -> hydrogen gas is bubbled off
Answer: (a).hydrogen gas is bubbled off

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