A waste water sample diluted to 100 times with aeration water had an initial dis

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Question
A waste water sample diluted to 100 times with aeration water had an initial dissolved oxygen (DO) of 7.0 mg/l and after 5 days of incubation at 20�C, the DO was zero. The BOD of waste water is :
Options
A. 700 mg/l
B. 100 mg/l
C. cannot be determined
D. 7mg/l

Correct Answer

700 mg/l

GATE Exam Questions problems

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1. A roundabout is provided with an average entry width of 8.4 m, width of weaving section as 14 m, and length of the weaving section between channelizing islands as 35 m. The crossing traffic and total traffic on the weaving section are 1000 and 2000 PCU per hour respectively. The nearest rounded capacity of the roundabout (in PCU per hour) is
Options
A. 3300
B. 3700
C. 4500
D. 5200

3. Compaction by vibratory roller is the best method of compaction in case of
Options
A. moist silty sand
B. well graded dry sand
C. clay of medium compressibility
D. silt of high compressibility

4. Rivets and bolts subjected to both shear stress (?_{vf , cal}) and axial tensile stress (?_{tf , cal}) shall be so proportioned that the stresses do not exceed the respective allowable stresses ?_vf and ?_tf and the value of exceed does not exceed
Options
A. 1.0
B. 1.2
C. 1.4
D. 1.8

6. The order or the flexibility matrix for a structure is,
Options
A. equal to the number of redundant forces
B. more than the number of redundant forces
C. less than the number of redundant forces
D. equal to the number of redundant forces plus three

7. For the strip footing on a saturated clay, for the given failure surface as shown in the below figure, the bearing capacity equation takes the form : (where C_u - undrained shear strength ?_u - angle of internal friction B - width of strip footing qc - ultimate bearing capacity of soil)
Options
A. 5.7 C_u
B. 5.14 C_u
C. 4? C_u
D. 2? C_u

8. The Bowen ratio is defined as :
Options
A. Ratio of heat and vapour diffusivities.
B. Proportionality constant between vapour heat flux and sensible heat flux.
C. Ratio of actual evapotranspiration and potential evapotranspiration.
D. Proportionality constant between heat energy used up in evaporation and the bulk radiation from a water body.

10. The proposed dam shown in the below figure is 90 m long and coefficient of permeability of the soil is 0.0013 mm/second. The quantity of water (m³) that will be lost per day, by seepage is (rounded to the nearest number):
Options
A. 55
B. 57
C. 59
D. 61

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