Anti-knock characteristics of alcohol, compared to gasoline is

better
poor
same
keeps changing

The correct answer is (a). Alcohol has better anti-knock characteristics than gasoline. This means that it is less likely to cause engine knocking, which can damage the engine. Alcohol is a better fuel for engines because it has a higher octane rating than gasoline. Octane rating is a measure of a fuel’s resistance to knocking. The higher the octane rating, the less likely the fuel is to knock. Alcohol also has a higher energy content than gasoline, which means that it can produce more power.

Option (b) is incorrect because alcohol does not have poor anti-knock characteristics. In fact, it has better anti-knock characteristics than gasoline.

Option (c) is incorrect because alcohol is not the same as gasoline. It has different properties, including a higher octane rating and a higher energy content.

Option (d) is incorrect because alcohol’s anti-knock characteristics do not keep changing. They are always better than gasoline’s.

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