UPSC Prelims 1999·GS1·science-and-technology·materials and robotics

Consider the following statements regarding a motor car battery: I. The voltage is usually 12 V. II. Electrolyte used is hydrochloric acid. III. Electrodes are lead and copper. IV. Capacity is expressed in ampere-hour. Which of the above statements are correct?

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  1. AI and II
  2. BII and III
  3. CIII and IV
  4. DI and IVCorrect

Explanation

The correct answer is D because of the following reasons: Statement I is correct: Standard motor car batteries are lead acid batteries that typically provide a nominal voltage of 12 Volts. Statement II is incorrect: The electrolyte used in a car battery is dilute sulfuric acid, not hydrochloric acid. Statement III is incorrect: The electrodes are made of lead and lead dioxide, not copper. Lead acts as the negative electrode while lead dioxide acts as the positive electrode. Statement IV is correct: Battery capacity represents the amount of electric charge it can deliver, which is measured in Ampere-hours. Therefore, only statements I and IV are accurate.
science-and-technology: Consider the following statements regarding a motor car battery: I. The voltage is usually 12 V. II. Electrolyte used is
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