Civil Engineering - GATE Exam Questions

46. 

The characteristic strength of concrete is defined as that compressive strength below which not more than

A. 10% of results fall
B. 5% of results fall
C. 2% of results fall
D. None of the above.

Answer: Option B

Explanation:

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47. 

Un-factored maximum bending moments at a section of a reinforced concrete beam resulting from a frame analysis are 50, 80, 120 and 180 kNm under dead, live, wind and earthquake loads respectively. The design moment (kNm) as per IS: 456-2000 for the limit state of collapse (flexure) is

A. 195
B. 250
C. 345
D. 372

Answer: Option D

Explanation:

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48. 

The microbial quality of treated piped water supplies is monitored by

A. Microscopic examination
B. Plate count of heterotrophic bacteria
C. Coliform MPN test
D. Identification of all pathogens

Answer: Option C

Explanation:

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49. 

The 5-day BOD of a wastewater sample is obtained as 190 mg/l (with k = 0.01 h-1). The ultimate oxygen demand (mg/l) of the sample will be

A. 3800
B. 475
C. 271
D. 190

Answer: Option C

Explanation:

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50. 

A tube well having a capacity of 4 m3/hour operates for 20 hours each day during the irrigation season. How much area can be commanded if the irrigation interval is 20 days and depth of irrigation is 7 cm ?

A. 1.71 x 104 m2
B. 1.14 x 104 m2
C. 22.9 x 104 m2
D. 2.29 x 104 m2

Answer: Option D

Explanation:

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