Day plants absorb . . . . . . . . from air by photosynthesis process.
A. O2
B. N2
C. CO2
D. NO2
Answer: Option C
This Question Belongs to Mining Engineering >> Mine Ventilation
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The mechanical mixture of gases existing in a mine given off after explosion called
A. White damp
B. Stink damp
C. Black damp
D. After damp
A Drager Gas Mask does not filter
A. Water vapour
B. Nitrous fumes
C. Carbon monoxide
D. Carbon dioxide
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