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State PCS PYQPrelims 2021

UPPCS · प्रश्न 68

'Ringelmann scale' is used to measure the density of:

  1. Smoke
  2. Polluted water
  3. Fog
  4. Noise
उत्तर देखें और व्याख्या

उत्तर: (A) Smoke

व्याख्या

The Ringelmann chart grades the density (blackness) of smoke from chimneys.