State PCS PYQPrelims 2022

BPSC – Combined Competitive Examination · প্রশ্ন 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
উত্তর দেখান ও ব্যাখ্যা

উত্তর: (B) Centrifugation

ব্যাখ্যা

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

  • (A) ভুল

    Wrong: not the principle.

  • (B) সঠিক

    Correct: spinning throws water out of clothes.

  • (C) ভুল

    Wrong: not the principle.

  • (D) ভুল

    Wrong: used in water purifiers.

  • (E) ভুল

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