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Assertion: cleaning luminaires saves energy. Reason: a dirty luminaire consumes more electricity than a clean one.

  • A.both the assertion and the reason are true but the reason does not explain the assertion
  • B.the assertion is false although the reason offered is a true statement in itself
  • C.the assertion is true but the reason given for it is false
  • D.both the assertion and the reason are true and the reason explains the assertion

Answer: C

The consumption is unchanged; what falls is the light delivered, so the same electricity buys less and the effective efficacy drops. Cleaning restores the output, which allows luminaires to be removed or dimmed and the saving then realised.

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