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Biofuels / Ethanol Blending

1 UPSC Prelims MCQs tagged "Biofuels / Ethanol Blending". Free practice with answer keys, explanations, and timed mock tests on Anantam IAS.

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Consider the following statements regarding the technical aspects of ethanol blending:
Consider the following statements regarding the technical aspects of ethanol blending:
1. AOnly 1 and 2
2. BOnly 2 and 3
3. COnly 1 and 3
4. D1, 2 and 3
Answer and explanation
Correct answer: B
E20 means a blend of 20% ethanol by volume, not by weight, so statement 1 is wrong. Higher ethanol blends do call for engine and material modifications because ethanol can corrode some components, and ethanol's calorific value is lower than petrol's, so statements 2 and 3 are correct.
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Science & Technology UPSC GPSC-2026 Medium