alleryA good fuel should NOT:
AHave a high calorific value
BBurn easily
CLeave behind harmful residues
DBe readily available
Answer & Solution
Correct answer: C. Leave behind harmful residues
1. Calorific value, ease of burning and availability are positive features of fuels.
2. A good fuel should leave little or no harmful residue.
3. Leftover ash or toxic gases reduce a fuel's quality.
4. So a good fuel should NOT leave behind harmful residues.
5. The other three are desirable characteristics.
_Source: syllabus Science Ch 14 'Sources of Energy' (byjus.com extract)_
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