UK Driving Theory Practice Exam 2025 - Free Driving Theory Practice Questions and Study Guide

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Which type of water should be used to fill up battery fluid?

Tap water

Distilled water

Using distilled water to fill up battery fluid is the correct choice because it is free from minerals and impurities that could affect the chemical reactions within the battery. Unlike tap water, which often contains minerals and chemicals like chlorine, distilled water has been purified through distillation, ensuring that it doesn't introduce any foreign substances that could lead to mineral buildup or reduce the battery's performance.

Mineral water and spring water contain various minerals that can also negatively impact the battery's function. These minerals can cause corrosion or interfere with the battery’s chemistry, ultimately shortening its lifespan. Therefore, using distilled water keeps the internal components of the battery functioning optimally while prolonging battery life.

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Mineral water

Spring water

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