Chlorine dose 5 mg/L এবং Residual Chlorine 0.5 mg/L হলে Chlorine demand কত?

Chlorine dose 5 mg/L এবং Residual Chlorine 0.5 mg/L হলে Chlorine demand কত?

  1. ক) 4 mg/L
  2. খ) 4.5 mg/L
  3. গ) 5.5 mg/L
  4. ঘ) 0.5 mg/L

From the LGED Sub-Assistant Engineer (Civil) November 2026 – Preliminary (BPSC) exam, question 45 of 100.

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