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13.

A cylindrical specimen of saturated soil failed under an axial vertical stress of 100kN/m2 when it was laterally unconfmed. The failure plane was inclined to the horizontal plane at an angle of 45.The values of cohesion and angle of internal friction for the soil are respectively                        
A. 0.5 N/mm2 and 30 B. 0.05 N/mm2 and 0
C. 0.2 N/mm2 and 0 D. 0.05 N/mm2 and 45



14.

A normally consolidated clay settled 10 mm when effective stress was increased from 100 kN/m2 to 200 kN/ m2. If the effective stress is further increased from 200 kN/ m2 to 400 kN/ m2, then the settlement of the same clay is                        
A. 10 mm B. 20 mm
C. 40 mm D. none of the above



15.

A pycnometer is used to determine                        
A. water content and voids ratio B. specific gravity and dry density
C. water content and specific gravity D. voids ratio and dry density




16.

According to Atterberg, the soil is said to be of medium plasticity if the plasticity index PI is                        
A. 0 < PI < 7 B. 7
C. 17 D. PI>27



17.

According to IS classification, the range of silt size particles is                        
A. 4.75 mm to 2.00 mm B. 2.00 mm to 0.425 mm
C. 0.425 mm to 0.075 mm D. 0.075 mm to 0.002 mm



18.

At liquid limit, all soils possess                        
A. same shear strength of small magni-tude B. same shear strength of large magni-tude
C. different shear strengths of small magnitude D. different shear strengths of large magnitude



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