Soil Mechanics - Soil and Water Conservation Engineering - Agricultural Engineering Previous Year Questions

1

2007 · Agricultural Engineering · Soil and Water Conservation Engineering · Soil Mechanics

Agricultural Engineering (AG) 2007

The specific gravity and void ratio of a soil sample are \(G\) and \(e\) respectively. The hydraulic gradient is

A

\(\frac{G-1}{1+e}\)

B

\(\frac{G+1}{1-e}\)

C

\(\frac{1-G}{1+e}\)

D

\(\frac{1+G}{1+e}\)

Open complete paper

2

2007 · Agricultural Engineering · Soil and Water Conservation Engineering · Soil Mechanics

Agricultural Engineering (AG) 2007

A cohesive soil has an angle of shearing of 15° and a cohesion of 35 kPa. The value of lateral pressure in the cell for failure to occur at a total stress of 300 kPa during the triaxial test is

A

59.58 kPa

B

122.92 kPa

C

140.41 kPa

D

230.34 kPa

Open complete paper

3

2007 · Agricultural Engineering · Soil and Water Conservation Engineering · Soil Mechanics

Agricultural Engineering (AG) 2007

A drop spillway is subjected to horizontal and vertical forces of 40.8 kN and 36.5 kN respectively. The area of plane of sliding is 10 m². Angle of internal friction and cohesive resistance of foundation material are 25° and 4.9 kPa respectively. The factor of safety against sliding is

A

0.53

B

0.61

C

1.62

D

1.86

Open complete paper

4

2009 · Agricultural Engineering · Soil and Water Conservation Engineering · Soil Mechanics

Agricultural Engineering (AG) 2009

The intensity of active earth pressure in kPa at a depth of 10 m in dry cohesionless sand with an angle of internal friction of 25° and specific weight of 15 kN m^-3 is

A

39

B

61

C

79

D

129

Open complete paper

5

2010 · Agricultural Engineering · Soil and Water Conservation Engineering · Soil Mechanics

Agricultural Engineering (AG) 2010

The mass of a 3.0 mm crumbled soil thread is 17.5 × 10^-3 kg. On oven-drying, the mass of the soil thread reduces to 14.9 × 10^-3 kg. The liquid limit of the soil sample is 35.4%. The plasticity index of the soil sample is

A

14.9

B

18.0

C

32.8

D

35.4

Open complete paper

6

2011 · Agricultural Engineering · Soil and Water Conservation Engineering · Soil Mechanics

Agricultural Engineering (AG) 2011

A completely saturated clay soil has particle density of 2600 kg m\(^{-3}\) and bulk density of 1400 kg m\(^{-3}\). It has a moisture fraction of 40% on volume basis. The porosity of the soil is

A

0.46

B

0.54

C

0.74

D

0.86

Open complete paper

7

2011 · Agricultural Engineering · Soil and Water Conservation Engineering · Soil Mechanics

Agricultural Engineering (AG) 2011

In a falling head permeameter test, the initial head is 0.30 m. The head drops to 0.10 m in 40 min. The permeability of a soil sample, 0.06 m high and 50 × 10^-4 m² in cross-sectional area, is found to be 1.0 × 10^-8 m s^-1. The size of the stand pipe in m² is

A

1.82

B

1.82 × 10^-1

C

1.82 × 10^-2

D

1.82 × 10^-4

Open complete paper

8

2013 · Agricultural Engineering · Soil and Water Conservation Engineering · Soil Mechanics

Agricultural Engineering (AG) 2013

A soil has a void ratio of 0.75 and a specific gravity of 2.66. The value of critical hydraulic gradient at which quick sand condition will occur is

A

0.95

B

1.05

C

2.09

D

6.64

Open complete paper

9

2013 · Agricultural Engineering · Soil and Water Conservation Engineering · Soil Mechanics

Agricultural Engineering (AG) 2013

The pressure that does not have any measurable influence on the void ratio or shearing resistance of the soil mass is

A

pore water pressure

B

intergranular pressure

C

capillary pressure

D

surcharge pressure

Open complete paper

10

2016 · Agricultural Engineering · Soil and Water Conservation Engineering · Soil Mechanics

Agricultural Engineering (AG) 2016

A 3 m high retaining wall supports sandy soil of unit weight 18.5 kN m^-3. The angle of shearing resistance (\(\phi\)) is 30° and the surface of soil is horizontal. The magnitude of the active thrust (in kN m^-1) and its acting point from the top (in m) are

A

27.75 and 1

B

249.75 and 1

C

27.75 and 2

D

249.75 and 2

Open complete paper

11

2016 · Agricultural Engineering · Soil and Water Conservation Engineering · Soil Mechanics

Agricultural Engineering (AG) 2016

A soil has bulk density and particle density of 1.48 Mg m^-3 and 2.64 Mg m^-3, respectively. The saturated volumetric moisture content of soil is 36%. The porosity and void ratio of the soil are

A

0.36 and 0.56

B

0.44 and 0.79

C

0.79 and 0.44

D

0.56 and 0.36

Open complete paper

12

2017 · Agricultural Engineering · Soil and Water Conservation Engineering · Soil Mechanics

Agricultural Engineering (AG) 2017

The seepage analysis in earthen dams is carried out by drawing flownet which consists of equipotential and stream lines. For a homogeneous and isotropic earthen dam, these two lines are always

A

orthogonal to each other

B

parallel to each other

C

divergent to each other

D

convergent to each other

Open complete paper

13

2018 · Agricultural Engineering · Soil and Water Conservation Engineering · Soil Mechanics

Agricultural Engineering (AG) 2018

If the void ratio of a soil column is 0.43, the soil porosity is

A

0.30

B

0.40

C

0.70

D

0.75

Open complete paper

14

2019 · Agricultural Engineering · Soil and Water Conservation Engineering · Soil Mechanics

Agricultural Engineering (AG) 2019

Angle of internal friction of a certain grain (bulk density = 650 kg m−3) is 30°. A bin filled with this grain experiences a pressure of 60 kPa at its base. Ignoring the factor of safety, the safe height (in meter) to which water (density = 1000 kg m−3) can be filled in this bin (rounded off to two decimal places) is ________.

Check answer

Open complete paper

15

2020 · Agricultural Engineering · Soil and Water Conservation Engineering · Soil Mechanics

Agricultural Engineering (AG) 2020

A retaining wall of 5 m height retains cohesionless dry soil having density of 1.9 Mg m⁻³ and angle of internal friction of 28°. The surface of the backfill soil is horizontal. The active and passive earth pressures per meter length of the wall in kN are ______________ and ______________, respectively. [Take g = 9.81 m s⁻²]

A

84.11, 645.38

B

645.38, 84.11

C

142.12, 381.63

D

381.63, 142.12

Open complete paper

16

2021 · Agricultural Engineering · Soil and Water Conservation Engineering · Soil Mechanics

Agricultural Engineering (AG) 2021

Cohesionless soil is naturally deposited and makes a slope of infinite extent having slope angle of 25°. If the effective angle of internal friction of this soil is 30°, the factor of safety of slope is ______. [round off to 2 decimal places]

Check answer

Open complete paper

17

2021 · Agricultural Engineering · Soil and Water Conservation Engineering · Soil Mechanics

Agricultural Engineering (AG) 2021

A shear annulus with inner and outer diameters of 240 mm and 300 mm, respectively is used to measure shear strength of soil in the field. When it is inserted into the soil and rotated, the torque measured at the soil failure is 50 N·m. Shear strength of the soil in kPa is (Take \( \pi = 3.14 \))

A

14.49

B

18.94

C

21.54

D

28.98

Open complete paper

18

2021 · Agricultural Engineering · Soil and Water Conservation Engineering · Soil Mechanics

Agricultural Engineering (AG) 2021

A sample of wet sandy-clay loam soil of mass 135 kg is collected for laboratory tests. The wet density, water content (weight basis) and specific gravity of solids of this soil sample are 1.8 g·cm^-3, 18%, and 2.7, respectively. The dry density (in g·cm^-3) and porosity (in per cent) of the soil sample, respectively, are

A

1.53 and 43.50

B

1.53 and 77.00

C

1.65 and 43.50

D

1.65 and 77.00

Open complete paper

19

2022 · Agricultural Engineering · Soil and Water Conservation Engineering · Soil Mechanics

Agricultural Engineering (AG) 2022

A sample of 90% saturated clay soil has void ratio and specific gravity of 0.8 and 2.7, respectively. The bulk unit weight of soil in N m^-3 is ______. (Take unit weight of water = 9.81×10³ N m^-3)

A

10594.80

B

18639.00

C

18.64

D

10.60

Open complete paper

20

2022 · Agricultural Engineering · Soil and Water Conservation Engineering · Soil Mechanics

Agricultural Engineering (AG) 2022

A cylindrical metallic silo of 3 m internal diameter and 10 m depth is loaded with maize grain having bulk density of 720 kg m⁻³. The angle of internal friction between the maize grains is 24°, and that between the grain and wall is 22°. Using Airy’s theory, the calculated lateral pressure in kPa at the bottom of the silo is _______. [round off to two decimal place]
(Take g = 9.81 m s⁻²)

Check answer

Open complete paper