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Physics · Oct / Nov 2022 · Paper 11 · Question 16

5054Efficiency

X and Y are both 40 W, 240 V lamps. Lamp X is more efficient than lamp Y. Which statement correctly compares X with Y?

  1. AX is more expensive to run.
  2. BX has a lower electrical resistance.
  3. CX produces less light energy.
  4. DX produces less thermal energy.

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Correct answer: D. X produces less thermal energy.

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