Delhi Police Constable 27 Nov 2020 Shift 2 Paper

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Question : 22 of 100

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Which of the following statements about bio-gas is incorrect?

Bio-gas burns without smoke and leaves no residue.
Biogas contains less than 1% methane.
Bio-gas is also known as ‘gobar-gas’.
Plant parts, vegetable waste and sewage are used in the production of bio-gas.

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