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 statemen

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Q: 112 (IAS/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 ?

question_subject: 

Science

question_exam: 

IAS

stats: 

0,13,44,11,18,15,13

keywords: 

{'motor car battery': [0, 1, 0, 0], 'electrodes': [0, 1, 0, 0], 'electrolyte': [0, 1, 0, 0], 'voltage': [0, 0, 0, 1], 'capacity': [1, 2, 4, 6], 'iv': [6, 110, 77, 8]}

The correct statement regarding a motor car battery is:

I. The voltage is usually 12 V.

IV. The capacity of a battery is indeed expressed in ampere-hour

Explanation:

I. The voltage of a motor car battery is commonly 12 volts. This is the standard voltage used in most automotive electrical systems.

II. The electrolyte used in a motor car battery is typically sulfuric acid, not hydrochloric acid. Sulfuric acid is used as the electrolyte in lead-acid batteries, which are commonly used in motor cars.

III. The electrodes in a lead-acid battery used in motor cars are lead and lead dioxide, not lead and copper. The lead-acid battery consists of lead plates coated with lead dioxide (positive electrode) and pure lead (negative electrode) immersed in sulfuric acid.

IV. The capacity of a battery is indeed expressed in ampere-hour (Ah). It represents the total amount of charge a battery can deliver over a specific period of time.

Therefore, only statement I, IV is correct, while statements II, III are incorrect.