Day 28-Oct 16 worksheetBtech-Determin. of soil properties part 2

Which method gives the most accurate value of specific gravity of soil solids?

• Core cutter method

• Sand replacement method

• Density bottle method

• Water displacement method

In core cutter method, the test is applicable mainly for —

• Cohesive soils

• Sandy soils

• Gravelly soils

• Loamy soils

The rammer used in the core cutter method generally weighs about —

• 5 kg

• 7.5 kg

• 9 kg

• 12 kg

In sand replacement method, the sand used should generally pass through —

• 300 µ and retained on 150 µ

• 600 µ and retained on 300 µ

• 425 µ and retained on 212 µ

• 2 mm and retained on 600 µ

The water displacement method is best suited for —

• Dry and cohesionless soils

• Saturated sand samples

• Highly cohesive and sticky soils forming lump samples

• Any type of disturbed soil sample

The pycnometer method gives the most precise result than density bottle method for determining the specific gravity of fine grained soils.

• True

• False

In sand replacement method, density of sand is determined by calibrating cylinder and pouring cone.

• True

• False

Assertion (A): The core cutter method cannot be used for sandy soils. Reason (R): Because the soil is cohesive and stay intact when the cutter is driven.

• Both A and R are true, and R is the correct explanation of A.

• A is true, but R is false.

• A is false, but R is true.

• Both A and R are false.

The capacity of the density bottle used for specific gravity test is (a)   .

The core cutter mould has an approximate volume of (a)   .