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State PCS PYQPrelims 2022

BPSC – Combined Competitive Examination · Question 113

What is the working principle of a washing machine (dryer)?

  1. Diffusion
  2. Centrifugation
  3. Dialysis
  4. Reverse osmosis
  5. None of the above / More than one of the above
Show answer & explanation

Answer: (B) Centrifugation

Explanation

The spin cycle uses centrifugal action to separate water from clothes.

  • (A) Incorrect

    Wrong: not the principle.

  • (B) Correct

    Correct: spinning throws water out of clothes.

  • (C) Incorrect

    Wrong: not the principle.

  • (D) Incorrect

    Wrong: used in water purifiers.

  • (E) Incorrect

    Wrong: only one of the options A–D is correct.