Geotechnical Engineering II Mcqs

Q:

The exposure of the geotextiles to the elements tween lay down and covering should be a maximum of ____ days.

A) 1 B) 14
C) 150 D) 365
 
Answer & Explanation Answer: B) 14

Explanation: The geotextiles must be protected from sun light, UV rays, debris, etc. as it can potentially damage the geotextile. The exposure of the geotextiles to the elements tween lay down and covering should be a maximum of 14 days.

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6
Q:

The geotextiles are also used for fluid transmission and drainage function.

A) True B) False
 
Answer & Explanation Answer: A) True

Explanation: Since the geotextiles are permeable materials, the geotextiles with high porosity is used for fluid transmission and drainage function. They should have substantial thickness and high horizontal permeability.

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6
Q:

The geotextiles can withstand differential settlements.

A) True B) False
 
Answer & Explanation Answer: A) True

Explanation: Since the geotextiles are used to provide tensile strength in places where the shear stresses are generated, the use of geotextiles leads to redistribution of the stresses and hence it can withstand differential settlements.

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5
Q:

The GCL is a composite of ________

A) geotextiles and bentonite clay B) silt and gravel
C) gravel and bentonite clay D) geotextiles and gravels
 
Answer & Explanation Answer: A) geotextiles and bentonite clay

Explanation: The Bentofix Thermal Lock Geosynthetic clay liner (GCL) is a patented registered trade mark. It is a sandwiched composite of geotextiles and bentonite clay that is used to provide appositive barrier to liquids in containment applications.

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6
Q:

The geocells or geowebs are stitched together at _________ intervals.

A) 100 cm B) 200 to 50 mm
C) upto 600 m D) 1 km
 
Answer & Explanation Answer: C) upto 600 m

Explanation: The geocells or geowebs are stitched together at 200 to 50 mm intervals. They can even be welded together. The hexagonal or rhomboidal cells can be made of geosynthetic honeycomb design.

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6
Q:

The geotextiles are available in rolls of length _____

A) 100 cm B) 5m
C) up to 600m D) 1 km
 
Answer & Explanation Answer: C) up to 600m

Explanation: The geotextiles are permeable sheets of synthetic fibres that are available in thickness varying from 10 to 300 mils, widths up to 10 m and in rolls of length up to 600 m. The permeability of geotextile is comparable in range from coarse gravel to fine sand.

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4
Q:

If geotextiles are used as reinforcements, then they should have __________

A) low modulus of deformation B) high modulus of deformation
C) low coefficient of friction D) low breaking strength
 
Answer & Explanation Answer: B) high modulus of deformation

Explanation: When the geotextiles are used as reinforcements in the soil, they should take up some of the tensile stresses and help to distribute them more evenly. Therefore, they must have high modulus of deformation.

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4
Q:

Geotextiles are available in thickness varying from ________

A) 1 to 5 mils B) 5 to 10 mils
C) 10 to 20 mils D) 10 to 300 mils
 
Answer & Explanation Answer: D) 10 to 300 mils

Explanation: The geotextiles are permeable sheets of synthetic fibres that are available in thickness varying from 10 to 300 mils. 1 mil=1/100 inch=0.254 mm. Due to their fine thickness, they are permeable.

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