Soil Mechanics Questions and Answers – Modified Proctor Test and Harvard Miniature Compaction Test

This set of Soil Mechanics Questions & Answers for Exams focuses on “Modified Proctor Test and Harvard Miniature Compaction Test”.

1. The air voids line contains ___________
a) constant percentage air voids
b) water voids
c) varying percentage air voids
d) specific gravity of solids
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2. The zero air voids line is also known as ___________
a) density line
b) saturation line
c) specific gravity line
d) unit weight line
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3. The theoretical maximum compaction for any given water content corresponds to ______
a) least specific gravity
b) maximum specific gravity
c) zero air void condition
d) only air voids present without the presence of water
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4. The zero air void line shows the _________
a) dry density as a function of water content for soil containing no air voids
b) saturated density as a function of water content
c) partially saturated density as a function of water content
d) dry density as a function of specific gravity
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5. The zero air voids line is established by equation of __________
a) \(ρ_d=\frac{G}{1+wG}\)
b) \(ρ_d=\frac{Gρ_w}{wG}\)
c) \(ρ_d=\frac{ρ_w}{1+wG}\)
d) \(ρ_d=\frac{Gρ_w}{1+wG}\)
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6. For a line showing the relation between water content and dry density for a constant degree of saturation is __________
a) \(ρ_d=\frac{G}{1+wG}S\)
b) \(ρ_d=\frac{Gρ_w}{wG}S\)
c) \(ρ_d=\frac{ρ_w S}{1+wG}\)
d) \(ρ_d=\frac{Gρ_w}{1+\frac{wG}{S}}\)
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7. The Modified Proctor test was standardised by ____________
a) IS
b) AASHO
c) ASCE
d) CBR
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8. In Modified Proctor test the number of layers of the soil is compacted is ___________
a) 1
b) 2
c) 5
d) 3
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9. The weight of rammer in Modified proctor test is ______________
a) 4.5 kg
b) 2.5 kg
c) 18 lb
d) 22 lb
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10. The free fall height of rammer in Modified Proctor test is __________ inches.
a) 5
b) 12
c) 16
d) 18
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11. The Modified Proctor test curve of the water content – dry density curve lies __________ the SPT curve.
a) above
b) below
c) left side
d) right side
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12. The Modified Proctor test has its peak relatively towards ____________ in water content – dry density curve.
a) right
b) left
c) centre
d) near origin
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13. For same soil, the effect of heavier compaction is in ________
a) increase in the maximum dry density
b) decrease in the maximum dry density
c) decrease in stability
d) decrease in strength
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14. For same soil, the effect of heavier compaction is to ________
a) decrease the optimum water content
b) decrease in the maximum dry density
c) decrease in stability
d) decrease in strength
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15. In Harvard miniature compaction test, the soil is compacted by _______
a) vibration
b) kneading action
c) impact
d) dynamic
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