- 30 Minutes
- 20 Minutes
- 1 hr.
- 30 hrs.
- 120 dB (A)
- 130 dB (A)
- 140 dB (A)
- 115 dB (A)
- 90 dB (A)
- 85 dB (A)
Q) When using rescue apparatus, the leader shall carry a watch, shall record the pressure of the compressed oxygen at intervals of ____ or so, and shall commence the return journey in ample time.
Solution:
20 Minutes
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