Mine Ventilation - Study Mode

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[#66] The Argon gas behaves like a

(A) oxygen

(B) carbondioxide

(C) methane

(D) nitrogen

Correct Answer

(D) nitrogen

[#67] Mesh size of flame safety lamp is

(A) 30

(B) 10

(C) 20

(D) 5

Correct Answer

(C) 20

[#68] Day plants absorb . . . . . . . . from air by photosynthesis process.

(A) O 2

(B) N 2

(C) CO 2

(D) NO 2

Correct Answer

(C) CO 2

[#69] Find the velocity of air m/sec. the w.g is 25 mm and density of air 1 kg/m 3 .

(A) 5 m/sec

(B) 10 m/sec

(C) 20 m/sec

(D) 25 m/sec

Correct Answer

(C) 20 m/sec

[#70] Dry kata for light manual workers is

(A) 6

(B) 18

(C) 8

(D) 10

Correct Answer

(C) 8