MCQs Gate Civil Engineering
1. An open ended steel barrel of 1m height and 1m diameter is filled with saturated fine sand having coefficient of pet nobility of
.The barrel stands on a saturated bed of gravel the time required for the water level in the barrel t o drop by 0.75 m is(a) 58.9s
(b)75s
(c)100s
(d)150s
Ans. ( b )
2. The ultimate load capacity of a 10m long concrete pile of square cross section 500 mm
500 mm driven in t o a homogeneous clay layer having untrained cohesion valueosf40 kpa is 700 kN. If the cross-section of the pile is reduced to 250 mm 2500 mm and the length of he pile is increased to 20m, the ultimate lost capacity will be (a) 350kN
(b) 632.5 kN
(c) 722.5 kN
(d)1400kN
Ans. ( b )
3. The Froude number of flow in a rectangular channel is 0.8. If to depth of flow is 1.5 m, the critical depth is
(a) 1.80 m
(b) 1.56 m
(c) 1.36 m
(d) 1.29 m
Ans. ( d )
4. A well of diameter 20 cm fully penetrates a confined aquifer. After a long period of pumping at rate of 2720 litres per minute, the observations of drawdown taken at 10 m and 100 m distances from the centre of the well are found to be 3 m and 0.5 m respectively. The transmissivity of the aquifer is
(a) 676 m2/day
(b) 576 m2/day
(c) 526 m2/day
(d) 249 m2/day
Ans. ( b )
5. If the BOD3 of a wastewater sample is 75 mg/L and reaction rate constant K (base e) is 0.345 per day, the amount of BOD remaining in the given sample after 10 days is
(a) 3.21 mg/L
(b) 3.45 mg/L
(c) 3.69 mg/L
(d) 3.92 mg/L
Ans. ( c )
6. The design speed for a two-lane road is 80 kmph. When a design vehicle with a wheelbase of 6.6 m is negotiating a borizontal curve on that road, the off-tracking is measured as 0.096 m. The required widening of carriageway of the two-lane road on the curve is approximately
(a) 0.55 m
(b) 0.65 m
(c) 0.75 m
(d) 0.85 m
Ans. ( c )
7. A bench mark has been established at the soffit of an ornamental arch at the known elevation of 100.0 m above mean sea level. The back sight used to establish height of instrument is a inverted staff reading of 2.105 m. A forward sight reading with normally held staff of 1.105 m is taken on a recently constructed plinth. The elevation of the plinth is
(a) 103.210 m
(b) 101.000 m
(c) 99.0000 m
(d) 96.790 m
Ans. ( d )
8. Carbonate hardness (mg/L as CaCO3) present in the above water sample is
(a) 205
(b) 250
(c) 275
(d) 289
Ans. ( a )
9. The capacity of irrigation system to irrigate crop ‘X’ in 36 hectares is
(a) 83 liters/sec
(b) 67 liters/sec
(c) 57 liters/sec
(d) 53 liters/sec
Ans. ( b )
10. The area of crop ‘Y’ that can be irrigated when the available capacity of irrigation system is 40 litres/sec is
(a) 40 hectares
(b) 36 hectares
(c) 30 hectares
(d) 27 hectares
Ans. ( d )
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