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UPSC 1999: 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?
(a)I and II
(b)II and III
(c)III and IV
(d)I and IV
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Not attemptedCorrect Answer: (d) I and IV
A standard automotive lead-acid battery consists of six 2 V cells in series, giving about 12 V ([en.wikipedia.org](https://en.wikipedia.org/wiki/Lead%E2%80%93acid_battery?utm_source=openai)). Its electrolyte is dilute sulphuric acid, not hydrochloric acid; both electrodes are lead (Pb/PbO₂), not copper. Battery capacity is rated in ampere-hours ([en.wikipedia.org](https://en.wikipedia.org/wiki/Ampere-hour?utm_source=openai)). Thus statements I and IV are correct, giving option (d).
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Frequently Asked Questions
What is the correct answer to this UPSC 1999 Science & Technology question?▼
The correct answer is option (d): I and IV. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Energy & Environment question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 1999, GS Paper 1, as Question 112. It falls under Science & Technology > Energy & Environment.
What is the difficulty level of this UPSC question?▼
This question is rated "moderate". It requires sound conceptual understanding of the topic.
How many UPSC Prelims questions have been asked from Energy & Environment?▼
UPSC has asked 48 questions from Energy & Environment (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.