ااا ااا اما 153/2017

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Hardness of water is caused by the presence of calcium (Caz") and magnesium

(५०) ions. Which are the least soluble forms of calcium and magnesium at normal
water temperature ?

A) CaCl, and 11900, 8) 620100), and MgCl,

C) Ca(OH),and Mg(HCOs)2 D) ‏و0800‎ and Mg(OH),

The number of bricks required per cubic metre of brick masonry is
A) 400 B) 450 C) 500 D) 550

The spacing of tile drains to relieve waterlogged land is directly proportional to the
A) Depth of drain below the ground surface

B) Depth of impervious strata from the drain

C) Depth of drain below the water level

D) Coefficient of permeability of the ടലി 10 be drained

Which one of the following correctly defines aquiclude ?

A) Asaturated formation of earth material which not only stores water but also yields
itin sufficient quantity

B) A formation through which only seepage is possible and thus the yield is
insignificant compared to an aquifer

C) A geological formation which is neither porous nor permeable

D) A geological formation which is essentially impermeable to the flow of water

Which one of the following sections performs better on the ductility criterion ?
A) Balanced section B) Over-reinforced section
C) Under-reinforced section D) Non-prismatic section

Which one of the following pairs is not correctly matched ?

ಹಿ) 800/000 - 0 : Waste — water is toxic

B) BOD/COD < 0.2 : Acclimatization of seed is necessary

©( 800/000 < 0.6 : Waste —water is non biodegradable

0) 800 = COD =0 : Waste — water is devoid of organic matter

Which one of the following filters should be recommended for protected rural water
supply project ?

A) Pressure filter B) Slow sand filter

C) Diatomaceous earth filter D) Rapid sand filter

For cement-concrets, the stress-strain curve is approximately linear upto

3 5
A) 4 of ultimate stress B) 8 of ultimate stress

1 1
0) 2 of ultimate stress D) 3 of ultimate stress

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