Chemical oxygen Demand (COD) of a sample is always greater than Biochemical Oxyg

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Question
Chemical oxygen Demand (COD) of a sample is always greater than Biochemical Oxygen Demand (BOD) since it represents :
Options
A. biodegradable organic matter only
B. biodegradable and non-biodegradable organic matter
C. non-biodegradable organic matter
D. inorganic matter

Correct Answer

biodegradable and non-biodegradable organic matter

GATE Exam Questions problems

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1. The plan of stairs supported at each end by landings spanning parallel with risers is shown in the below figure. The effective span of staircase slab is
Options
A. 3000 mm
B. 4600 mm
C. 4750 mm
D. 6400 mm

2. The ordinate of the Instantaneous Unit Hydrograph (IUH) of a catchment at any time t, is
Options
A. The slope of the 1-hour unit hydrograph at that time
B. The slope of the direct runoff unit hydrograph at that time
C. Difference in the slope of the S-curve and 1-hour unit hydrograph
D. The slope of the S-curve with effective rainfall intensity of 1 cm/hr

3. A parabolic curve is used to connect a 4% upgrade with a 2% downgrade as shown in the below figure. The highest point on the summit is at a distance of (measured horizontally from the first tangent point - (FTP)
Options
A. 50 m
B. 60 m
C. 75 m
D. 100 m

4. For an anisotropic soil, permeabilities in x and y directions are k_x and k_y respectively in a two dimensional flow. The effective permeability k_eq for the soil is given by
Options
A. k_x + k_y
B. k_x/k_y
C. (k_x² + k_y²)^1/2
D. (k_xk_y)^1/2

7. A deep cut of 7 m has to be made in a clay with unit weight 16 kN/m³ and a cohesion of 25 kN/m². What will be the factor of safety if one has to have a slope angle of 30�? Stability number is given to be 0.178 (from Taylor's chart) for a depth factor of 3.
Options
A. 0.80
B. 1.1
C. 1.25
D. 1.0

8. In a BOD test, 5 ml of waste is added to 295 ml of aerated pure water. Initial dissolved oxygen (D.O) content of the diluted sample is 7.8 mg/l. After 5 days of incubation at 20�C, the D.O. content of the sample is reduced to 4.4 mg/l. The BOD of the waste water is :
Options
A. 196 mg/l
B. 200 m/l
C. 204 mg/l
D. 208 mg/l

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