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Sources of Energy — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceSources of Energy1 Mark
MCQ
Choose the incorrect statement :
  • A
    We are encouraged to plant more trees so as to ensure clean environment and also provide bio $-$ mass fuel.
  • B
    Gobar $-$ gas is produced when crops, vegetable wastes etc., decompose in the absence of oxygen.
  • ✓
    The main ingredient of bio $-$ gas is ethane and it gives a lot of smoke and also produces a lot of residual ash.
  • D
    Bio $-$ mass is a renewable source of energy.
✓

Answer

Correct option: C.
The main ingredient of bio $-$ gas is ethane and it gives a lot of smoke and also produces a lot of residual ash.
The main ingredient of biogas is methane. Except option $(c),$ all other options are correct.

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