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# Gate CE 2022: Civil Champion Quiz- Soil Mechanics and Environmental Engineering

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Question 1

A rectangular settling tank is to treat 3.6MLD of raw water. The sedimentation period is to be 3 hours; the velocity of flow is 10 cm/min. The cross sectional area of the basin is

Question 2

A sand layer is of 5m depth and under it clay layer of 5m depth . γsaturated sand = 20 kN/m2 and γsaturated clay = 19 kN/m2. The water table is at top of sand layer. If the water level drops by 3m but the zone above the water level is still saturated by capillary action then what is the effective stress at bottom of clay layer.

Question 3

10 m below sea water is the bed of the sea. Take the unit weight of water = 9.81 kN/m2. Take the specific gravity of soil solids and that of sea water as 2.67 and 1.03 respectively. Relative density of soil is 20%. The maximum void ratio is 1 and minimum void void ratio is 0.5. Effective stress (in kN/m2) at 30m depth below sand layer is

Question 4

Match List-I (Soil classification symbol) with List-II (Soil property) and select the correct answer using the codes given below the lists:
List-I
A- GW
B- SW
C- ML
D- CL
List-II
1- Soil having uniformity coefficient > 6
2- Soil having uniformity coefficient > 4
3- Clay having low compressibility
4- Silt having low compressibility

Question 5

Calculate the diameter of combined sewer in meter for the following data:

Catchment area = 200 hectare; population = 70,000; maximum permissible velocity = 3.5 m/s. Duration of time of concentration = 35 min; Rate of supply of water 180 l/capita/day. Take k = 0.5.

Question 6

The equivalent sound power level (in dB) of the four sources with the noise levels of 48 dB, 53 dB, 65 dB and 72 dB is ________dB
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