Soil Mechanics Quiz | Soil Mechanics Objective Type Questions and Answers

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Questions
21 Rise of water table above the ground surface causes
A equal increase in pore water pressure and total stress
B equal decrease in pore water pressure and total stress
C increase in pore water pressure but decrease in total stress
D decrease in pore water pressure but increase in total stress

Answer: equal increase in pore water pressure and total stress
22 Physical properties of a permeant which influence permeability are
A viscosity only
B unit weight only
C both viscosity and unit weight
D none of the above

Answer: both viscosity and unit weight
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23 Select the correct statement.
A The greater the viscosity, the greater is permeability
B The greater the unit weight, the greater is permeability
C The greater the unit weight, the smaller is permeability
D Unit weight does not affect per-meability

Answer: The greater the unit weight, the greater is permeability
24 Effective stress on soil
A increases voids ratio and decreases permeability
B increases both voids ratio and permeability
C decreases both voids ratio and permeability
D decreases voids ratio and increases permeability

Answer: decreases both voids ratio and permeability
25 Which of the following methods is more suitable for the determination of permeability of clayey soil ?
A constant head method
B falling head method
C horizontal permeability test
D none of the above

Answer: falling head method
26 Due to a rise in temperature, the viscosity and the unit weight of the percolating fluid are reduced to 60% and 90% respectively. If other things remain constant, the coefficient of permeability
A increases by 25%
B increases by 50%
C increases by 33.3%
D decreases by 33.3%

Answer: increases by 50%
27 Coefficient of permeability of soil
A does not depend upon temperature
B increases with the increase in temperature
C increases with the decrease in temperature
D none of the above

Answer: increases with the increase in temperature
28 The average coefficient of permeability of natural deposits
A parallel to stratification is always greater than that perpendicular to stratification
B parallel to stratification is always less than that perpendicular to stratification
C is always same in both directions
D parallel to stratification may or may not be greater than that perpendicular to stratification

Answer: parallel to stratification is always greater than that perpendicular to stratification
29 The total discharge from two wells situated near to each other is
A sum of the discharges from individual wells
B less than the sum of the discharges from individual wells
C greater than the sum of the discharges from individual wells
D equal to larger of the two discharges from individual wells

Answer: less than the sum of the discharges from individual wells
30 The most suitable method for drainage of fine grained cohesive soils is
A well ppint system
B vacuum method
C deep well system
D electroosmosis method

Answer: electroosmosis method
31 The slope of isochrone at any point at a given time indicates the rate of change of
A effective stress with time
B effective stress with depth
C pore water pressure with depth
D pore water pressure with time

Answer: pore water pressure with depth
32 Which one of the following clays behaves like a dense sand ?
A over-consolidated ciay with a high over-consolidation ratio
B over-consolidated clay with a low over-consolidation ratio
C normally consolidated clay
D under-consolidated clay

Answer: over-consolidated ciay with a high over-consolidation ratio
33 Coefficient of consolidation of a soil is affected by
A compressibility
B permeability
C both compressibility and permeability
D none of the above

Answer: both compressibility and permeability
34 Degree of consolidation is
A directly proportional to time and inversely proportional to drainage path
B directly proportional to time and inversely proportional to square of drainage path
C directly proportional to drainage path and inversely proportional to time
D directly proportional to square of drainage path and inversely proportional to time

Answer: directly proportional to time and inversely proportional to square of drainage path
35 Time factor for a clay layer is
A a dimensional parameter
B directly proportional to permeability of soil
C inversely proportional to drainage path
D independent of thickness of clay layer

Answer: directly proportional to permeability of soil
36 Coefficient of consolidation for clays normally
A decreases with increase in liquid limit
B increases with increase in liquid limit
C first increases and then decreases with increase in liquid limit
D remains constant at all liquid limits

Answer: decreases with increase in liquid limit
37 Direct measurement of permeability of the specimen at any stage of loading can be made
A only in fixed ring type consolido-meter
B only in floating ring type consolido-meter
C both (a) and (b)
D none of the above

Answer: only in fixed ring type consolido-meter
38 The ultimate consolidation settlement of a soil is
A directly proportional to the voids ratio
B directly proportional to the compression index
C inversely proportional to the compression index
D none of the above

Answer: directly proportional to the compression index
39 The maximum dry density upto which any soil can be compacted depends upon
A moisture content only
B amount of compaction energy only
C both moisture content and amount of compaction energy
D none of the above

Answer: both moisture content and amount of compaction energy
40 For better strength and stability, the fine grained soils and coarse grained soils are compacted respectively as
A dry of OMC and wet of OMC
B wet of OMC and dry of OMC
C wet of OMC and wet of OMC
D dry of OMC and dry of OMC where OMC is optimum moisture content

Answer: wet of OMC and dry of OMC

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