Water table drops by 3 m in an irrigable land of 50 hectare. If porosity and spe

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Question
Water table drops by 3 m in an irrigable land of 50 hectare. If porosity and specific retention are 0.30 and 0.10 respectively, the change in storage in hectare-meter is :
Options
A. 15
B. 30
C. 45
D. 60

Correct Answer

30

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1. A saturated clay stratum draining both at the top and bottom undergoes 50 percent consolidation in 16 years under an applied load. If an additional drainage layer were present at the middle of the clay stratum, 50 percent consolidation would occur in
Options
A. 2 years
B. 4 years
C. 8 years
D. 16 years

2. Breakpoint chlorination of water involves addition of chlorine in an amount sufficient to:
Options
A. react with any ammonia and readily oxidisable organic matter
B. kill Giardia cysts
C. react with inorganic matter
D. reduce bacterial growth in filters

6. Chlorine is some times used in sewage treatment
Options
A. to avoid flocculation
B. to increase biological activity of bacteria
C. to avoid bulking of activated sludge
D. to help in grease separation

8. The stress-strain diagram for two materials A and B is shown below.

The following statements are made based on this diagram :
1. Mateiral A is more brittle than material B.
2. The ultimate strength of material B is more than that of A.
With reference to the above statements, which of the following applies?
Options
A. Both the statements are false.
B. Both the statements are true.
C. I is true but II is false.
D. I is false but II is true.

9. For a flow of 5.7 MLD (million litres per day) and a detention time of 2 hours, the surface area of a rectangular sedimentation tank to remove all particles having settling velocity of 0.33 mm/s is
Options
A. 20 m²
B. 100 m²
C. 200 m²
D. 400 m²

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