- 19%
- 93%
- 50%
- none of these points
- 21%
- 120 dB (A)
- 130 dB (A)
- 140 dB (A)
- 115 dB (A)
- 90 dB (A)
- 85 dB (A)
Q) During testing of Self Contained, Closed Circuit Breathing Apparatus, the minimum percentage of oxygen in the inhaled air as per BIS standard is__.
Solution:
21%
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