Q.1

If the pump head ism, discharge is 0.m3/s and the motor speed isrpm at rated condition, the specific speed of the pump is about

  • 4
  • 26
  • 38
  • 1440
Q.2

At the same mean velocity, the ratio of head loss per unit length for a sewer pipe flowing full to that for the same pipe flowing half full would be :

  • 2.0
  • 1.63
  • 1.00
  • 0.61
Q.3

The value of bearing capacity factor for cohesion, Nc, for piles as per Meyerhof, is taken as :

  • 6.2
  • 12.0
  • 9.0
  • 5.14
Q.4

If the porosity of a soil sample is 20%, the void ratio is

  • 0.20
  • 0.80
  • 1.00
  • 0.25
Q.5

A wastewater sample contains 10-5.6 mmol/l of OH ions atC. The pH of this sample is

  • 8.6
  • 8.4
  • 5.6
  • 5.4
Q.6

The modulus of rupture of concrete gives

  • the direct tensile strength of the concrete
  • the direct compressive strength of the concrete
  • the tensile strength of the concrete under bending
  • the characteristic strength of the concrete
Q.7

The appropriate field test to determine the insitu undrained shear strength of soft clay is :

  • plate load test
  • static cone penetration test
  • standard penetration test
  • vane shear test
Q.8

In a river, discharge ism3/s; water surface slope is 1 inand stage at the gauge station is 10.0 m. If during a flood, the stage at the gauge station is same and the water surface slope is 1 inthe flood discharge in m3/s, is approximately

  • 371
  • 100
  • 519
  • 300
Q.9

Rapid curing cut back bitumen is produced by blending bitumen with

  • Kerosene
  • Benzene
  • Diesel
  • Petrol
Q.10

In using the data from a plate bearing test for determining the modulus of subgrade reaction, the value of settlement to be used is :

  • 1.25 mm
  • 2.50 mm
  • 3.75 mm
  • 1.75 mm
Q.11

According to Darcy's law for flow through porous media, the velocity is proportional to

  • Effective stress
  • hydraulic gradient
  • cohesion
  • stability number
Q.12

Compaction by vibratory roller is the best method of compaction in case of

  • moist silty sand
  • well graded dry sand
  • clay of medium compressibility
  • silt of high compressibility
Q.13

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

  • 3000 mm
  • 4600 mm
  • 4750 mm
  • 6400 mm
Q.14

Two samples of water A and B have pH values of 4.4 and 6.4 respectively. How many times more acidic sample A is than sample B ?

  • 0
  • 50
  • 100
  • 200
Q.15

The consistency of a saturated cohesive soil is affected by

  • water content
  • particle size distribution
  • density index
  • coefficient of permeability
Q.16

When a retaining wall moves away from the backfill, the pressure exerted on the wall is termed as

  • passive earth pressure
  • swelling pressure
  • pore pressure
  • active earth pressure
Q.17

As per IS : 800-the minimum pitch of rivets in a row is recommended as the diameter of the rivet times

  • 2.0
  • 2.5
  • 3.0
  • 4.0
Q.18

Permissible bending tensile stress in high yield strength deformed bars of gradeN/mm2 in a beam is :

  • 190 N/mm2
  • 230 N/mm2
  • 140 N/mm2
  • None of the above
Q.19

At a rated capacity ofCumecs, a centrifugal pump developsm of head when operating atrpm. Its specific speed is :

  • 654
  • 509
  • 700
  • 90
Q.20

In an area ofhectare, water table drops by 4 m. If the porosity is 0.and the specific retention is 0.change in volume of storage in the aquifer is

  • 160 m3
  • 1.6 x 106 m
  • 8 x 106 m3
  • 1.6 x 103 m3
Q.21

Chemical oxygen Demand (COD) of a sample is always greater than Biochemical Oxygen Demand (BOD) since it represents :

  • biodegradable organic matter only
  • biodegradable and non-biodegradable organic matter
  • non-biodegradable organic matter
  • inorganic matter
Q.22

The most commonly used sampler for obtaining a disturbed sample of the soil is

  • split spoon sampler
  • open drive sampler
  • piston sampler
  • thin wall shelby tube sampler
Q.23

Two primary air pollutants are

  • sulphur oxide and ozone
  • nitrogen oxide and peroxyacetylnitrate
  • sulphur oxide and hydrocarbon
  • ozone and peroxyacetynitrate
Q.24

The ordinate of the Instantaneous Unit Hydrograph (IUH) of a catchment at any time t, is

  • The slope of the 1-hour unit hydrograph at that time
  • The slope of the direct runoff unit hydrograph at that time
  • Difference in the slope of the S-curve and 1-hour unit hydrograph
  • The slope of the S-curve with effective rainfall intensity of 1 cm/hr
Q.25

A soil sample has a void ratio of 0.5 and its porosity will be close to

  • 50%
  • 66%
  • 100%
  • 33%
Q.26

Presence of ifluoride in water greater than permissible level of 1.5 mg/l causes

  • cardiovascular disease
  • methemoglobinemia
  • hepatitis
  • dental fluorosis
Q.27

The unit of dynamic viscosity of a fluid is

  • m2/s
  • Ns/m2
  • Pa s/m2
  • kg s2/m2
Q.28

Compaction by vibratory roller is the best method of compaction in case of

  • moist silty sand
  • well graded dry sand
  • clay of medium compressibility
  • silt of high compressibility
Q.29

Flocculation is a process

  • that removes algae from stabilization pond effluent
  • that promotes the aggregation of small particles into larger particles to enhance their removal by gravity
  • both (a) and (b)
  • none of these.
Q.30

Bending moments at joint b and c of the portal frame are respectively :

  • + p l/2, - p l/2
  • + p l/2, + p l/2
  • + p l/4, - p l/4
  • + p l/4, + p l/4
0 h : 0 m : 1 s