Compaction

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This page contains MCQs based on Compaction, its effect, tests on compaction, the result of compaction 

1. In the Compaction test, with the increase in compaction energy

A) Both dry density and Optimum Moisture Content increases
B) Maximum dry density increases but Optimum Moisture Content decreases
C) Maximum dry density decreases but Optimum Moisture Content increases
D) Both dry density and Optimum Moisture Content decreases

... Answer is B
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2. What is the number of blows required for compacting each layer for 2.25L mould in compaction test?

A) 36
B) 25
C) 56
D) 31

... Answer is C
For 1L mould 25 blows per each layer shall be provided
 

3. Which among the following has highest OMC?

A) Gravel
B) Silt
C) Sand
D) Clay

... Answer is A
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4. Factors affecting the compaction are

A) Water content
B) Compactive energy
C) Soil type
D) All the above

... Answer is D

 

5. Vibrator roller are useful for compacting__________

A) Cohesion less soil
B) Crushed rocks
C) Clayey soil
D) Gravel

... Answer is A

 

6. Clayey soil are best compacted by

A) Vibration
B) Impact
C) Kneading
D) All the above

... Answer is C

 

7. Compaction of soil is measured in terms of

A) dry density
B) Compressibility
C) Permeability
D) Specific gravity

... Answer is A

 

8. Optimum moisture content is the moisture content at which

A) Permeability is more
B) Settelment is maximum
C) Shear stength is less
D) dry density is maximum

... Answer is D

 

9. Clay particles on the wet side of optimum moisture content exibits

A) Honeycomb structure
B) Flocculent structure
C) Dispersed structure
D) Single grained structure

... Answer is C
For a given compactive effort, soils have a flocculated structure on the dry side (i.e. soil particles are oriented randomly), whereas they have a dispersed structure on the wet side (i.e. particles are more oriented in a parallel arrangement perpendicular to the direction of applied stress)
 

10. The 95% saturation line and 5% air voids line are______

A) Different
B) Same
C) May or may not be same
D) Can not be said

... Answer is A
100% saturation line and 0% sair void line are same
 

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