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Objective Questions
ITI
Draughtsman Civil
Draughtsman Civil Set-1
Bridges and Culverts
Bridges and Culverts MCQ with Answers
21)
What is the minimum percentage of oxygen concentration in underground air quality for tunnel?
0.125
0.155
0.175
0.195
Answer
Answer is:
0.195
22)
What is the maximum noise levels of ventilation fans while measure at the closest point of employee exposure?
90 decibel
100 decibel
120 decibel
130 decibel
Answer
Answer is:
90 decibel
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