RRB JE exam Civil Engineering Soil Important MCQs – 4

32. When the plastic limit of a soil is greater than the liquid limit, then the plasticity index is reported as
a)
 negative
b)
 zero
c)
 non-plastic (NP)
d)
 1
Correct Option:b

33. Toughness index is defined as the ratio of
a)
 plasticity index to consistency index
b)
 plasticity index to flow index
c)
 liquidity index to flow index
d)
 consistency index to liquidity index
Correct Option:b

34. If the plasticity index of a soil mass is zero, the soil is
a)
 sand
b)
 silt
c)
 clay
d)
 clayey silt
Correct Option:a

35. The admixture of coarser particles like sand or silt to clay causes
a)
 decrease in liquid limit and increase in plasticity index
b)
 decrease in liquid limit and no change in plasticity index
c)
 decrease in both liquid limit and plasticity index
d)
 increase in both liquid limit and plasticity index
Correct Option:c

36. Select the correct statement.
a)
 A uniform soil has more strength and stability than a non-uniform soil.
b) A uniform soil has less strength and stability than a non-uniform soil.
c)
 Uniformity coefficient does not affect strength and stability.
d)   Uniformity  coefficient of a poorly graded soil is more than that of a well graded soil.

Correct Option:b

38. The water content of soil, which represents the boundary between plastic state and liquid state, is known as
a)
 liquid limit
b)
 plastic limit
c)
 shrinkage limit
d)
 plasticity index
Correct Option:a

39. Which of the following soils has more plasticity index ?
a)
 sand
b)
 silt
c)
 clay
d)
 gravel
Correct Option:c

40. At liquid limit, all soils possess
a)
 same shear strength of small magnitude
b)
 same shear strength of large magnitude
c)
 different shear strengths of small magnitude
d)
 different shear strengths of large magnitude
Correct Option:a