soil mechanics and foundation engineering




1).
In a liquid limit test, the moisture content at 10 blows was 70% and that at 100 blows was 20%. The liquid limit of the soil, is
A   35%   
B   50%   
C   65%   
D   none of these.   
ANS: C - 65%

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2).
The active earth pressure of a soil is proportional to (where φ is the angle of friction of the soil)
A   tan (45° - φ)   
B   tan2 (45° + φ/2)   
C   tan2 (45° - φ/2)   
D   tan (45° + φ)   
ANS: C - tan2 (45° - φ/2)

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3).
The minimum water content at which the soil just begins to crumble when rolled into threads 3 mm in diameter, is known
A   liquid limit   
B   plastic limit   
C   shrinkage limit   
D   permeability limit   
ANS: B - plastic limit

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6).
The lateral earth pressure on a retaining wall
A   is equal to mass of the soil retained   
B    proportional to the depth of the soil   
C   proportional to the square of the depth of the soil   
D   proportional to the internal friction of the soil   
E   none of these.   
ANS: D - proportional to the internal friction of the soil

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7).
The internal molecular attraction of a soil, the cohesion
A   decreases as the moisture content increases   
B   increases as the moisture content decreases   
C   is more in well compacted clays   
D   depends upon the external applied load.   
ANS: B - increases as the moisture content decreases

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8).
The quantity of seepage of water through soils is proportional to
A   coefficient of permeability of soil   
B   total head loss through the soil   
C   neither (a) nor (b)   
D   both (a) and (b).   
ANS: D - both (a) and (b).

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9).
When drainage is permitted under initially applied normal stress only and full primarily consolidation is allowed to take place, the test is known as
A   quick test   
B   drained test   
C   consolidated undrained test   
D   none of these.   
ANS: C - consolidated undrained test

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10).
The minimum water content at which the soil retains its liquid state and also possesses a small shearing strength against flowing, is known
A   liquid limit   
B   plastic limit   
C   shrinkage limit   
D   permeability limit   
ANS: A - liquid limit

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