41. Breathing get doubled, when CO2 present in a mine is about . . . . . . . . A. 2% B. 3% C. 4% D. 5% Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
42. The dustiness can be formed at stone crushing sites about . . . . . . . . A. 1.5 mg/m3 B. 22 - 45 mg/m3 C. 136 - 200 mg/m3 D. 5 - 10 mg/m3 Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
43. Safety torches are . . . . . . . . apparatus. A. Intrinsically safe B. Fire proof C. Water proof D. Gas proof Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board