Determination of Unit Weight and Specific Gravity

Q.

The dry density of a soil is 1.5 g/cc. If the saturation water content were 50% then its saturated density and submerged density would, respectively, be

1. 1.5 g/cc and 1.0 g/cc
2. 2.0 g/cc and 1.0 g/cc
3. 2.25 g/cc and 1.25 g/cc
4. 2.50 g/cc and 1.50 g/cc

Q. The water content of a saturated soil and specific gravity of soil solids were found to be 30% and 2.70 respectively. Assuming the unit wt of water to be $10kN/m^3$, the saturated unit wt (kN/$m^3$) and the void ratio of the soil are

1. 19.4, 0.81
2. 18.5, 0.30
3. 19.4, 0.45
4. 18.5, 0.45

Q. A soil sample in its natural state has mass of 2.290 kg and a volume of 1.15 $\times$ ${10}^{-3}$$m^3$. After being oven dried, the mass of the sample is 2.035 kg. $G_s$ for soil is 2.68. The void ratio of the natural soil is

1. 0.40
2. 0.45
3. 0.55
4. 0.53

Q. What are the respective values of void ratio, porosity ratio and saturated density $\left(inkN/m^3\right)$ for a soil sample which has saturation moisture content of 20% and specific gravity of grains as 2.6? (take density of water as $\left(10kN/m^3\right)$

1. 0.52, 1.08, 18.07
2. 0.52, 0.34, 18.07
3. 0.77, 1.08, 16.64
4. 0.52, 0.34, 20.14

Q. A $588c{m}^3$ volume of moist sand weighs 1010 gm. Its dry weight is 918 gm and G is 2.67. Assuming density of water as 1 gm/cc, the void ratio is

1. 0.71

Q. What is the dry unit weight of a clay soil when the void ratio of a sample there of is 0.50, the degree of saturation is 70% and the specific gravity of soil grains is 2.7? Take the value of ${\gamma }_w$ to be $9.81kN/m^3$.

1. $13.651kN/m^2$

2. $19.951kN/m^2$
3. $23.651kN/m^2$
4. $29.95kN/m^2$

Q. Which one the following represents relative density of saturated sand deposit having moisture content of 25%, if maximum and minimum void ratio of sand are 0.95 and 0.45 respectively and specific gravity of sand particles is 2.6?

1. 40%
2. 50%
3. 60%
4. 70%

Q. The ratio of dry unit weight to unit weight of water represents

1. specific gravity of soil solids
2. specific gravity of soil mass
3. specific gravity of dry soil
4. shrinkage ratio

Q. A saturated specimen of clay was immersed in mercury and displaced volume of 30 cc and weight of sample obtained was 45 gm. After oven drying for 48 hours, weight reduced to 30 gm. While the volume came down to 18cc. The specific gravity of clay specimen is

1. 2.5
2. 3.2
3. 2
4. 1.75

Q. In specific gravity test the following observations were made
Weight of dry soil : 50 N
Weight of bottle + soil + water : 100 N
Weight of bottle + water : 85.5 N

If while obtaining the weight 100 N, 3 ml air remained entrapped in suspension, then the percentage error obtained in measuring the specific gravity of soil solids is

1. 0.08%
2. 0.06%
3. 0.04%
4. 0.03%

Q.

The dry density of a soil is 1.5 g/cc. If the saturation water content were 50% then its saturated density and submerged density would, respectively, be

1. 1.5 g/cc and 1.0 g/cc
2. 2.0 g/cc and 1.0 g/cc
3. 2.25 g/cc and 1.25 g/cc
4. 2.50 g/cc and 1.50 g/cc

Q. While boring was being done, the soil sample was found to be saturated with kerosene oil. The saturated unit weight of soil was found to be 2.5 gm/cc. If the specific gravity of soil grains and kerosene oil be 2.7 and 0.9 respectively, the dry unit weight is..... g/cc

1. 2.4
2. 1.8
3. 1.6
4. 2.6

Q. A sample of 500 g dry sand, when poured into a 2 litre capacity cylinder which is partially filled with water, displaces 188 $c{m}^3$ of water. The density of water is $1g/c{m}^3$. The specific gravity of the sand is

1. 2.66
2. 2.52
3. 2.72
4. 2.55

Q.

The dry density of a soil is 1.5 g/cc. If the saturation water content were 50% then its saturated density and submerged density would, respectively, be

1. 1.5 g/cc and 1.0 g/cc
2. 2.0 g/cc and 1.0 g/cc
3. 2.25 g/cc and 1.25 g/cc
4. 2.50 g/cc and 1.50 g/cc