Smith Albert Edu world : February 2016

Monday, February 29, 2016

Soil Mechanics - Basic Concepts

Q.1. Unit weight of water at ${4^0}C$ is
(a) 1 g/cc
(b) 9.8 kN/ ${m^3}$
(c) both (a) and (b)
(d) neither (a) nor (b)

Q.2. The weight of solid matter in an soil element divided by volume of entire element is called
(a) bulk density
(b) dry density
(c) saturated unit weight
(d) submerged unit weight

Q.3. The formula for bulk density is $\frac{{G{\gamma _w}(1 + w)}}{{1 + e}}$ . G is specific gravity, w is water content, ${\gamma _w}$ is unit weight of water and e is void ratio. If we put w = 0, then we get
(a) saturated unit weight
(b) submerged unit weight
(c) dry unit weight
(d) none of these

Q.4. The formula for bulk density is $\frac{{G{\gamma _w}(1 + w)}}{{1 + e}}$ . The formula for degree of saturation(Sr) is wG/e. Where G is specific gravity, w is water content, ${\gamma _w}$ is unit weight of water and e is void ratio. Saturated unit weight can be calculated by putting
(a) Sr = 0
(b) Sr = 1
(c) w = 0
(d) w = 1

Q.5. A soil sample having a void ratio of 1.3 water content of 50% and a specific gravity of 2.60, is in a state of
(a) partial saturation
(b) full saturation
(c) oversaturation
(d) undersaturation (IES 2001)

Q.6. The unit weight of a soil at zero air voids depends upon
(a) specific gravity
(b) water content
(c) unit weight of water
(d) all these (GATE 1995)

Q.7. A sample of saturated sand has a dry unit weight of 18 $kN/{m^3}$ and a specific gravity of 2.7. If ${\gamma _{water}}$ is 10 $kN/{m^3}$ , the void ratio of the soil sample will be
(a) 0.5
(b) 0.6
(c) 0.4
(d) 0.9 (IES 2000)

Q.8. A soil has a bulk density of 1.80 $g/c{m^3}$ at a water content of 5% if the void ratio remains constant, then its bulk density for a water content of 10% will be
(a) 1.98 $g/c{m^3}$
(b) 1.88 $g/c{m^3}$
(c) 1.80 $g/c{m^3}$
(d) 1.70 $g/c{m^3}$ (IES 1993)

Q.9. Saturated unit weight of the soil is
(a) $\frac{{{\gamma _w}(G - e)}}{{1 + e}}$
(b) $\frac{{{\gamma _w}(G + e)}}{{1 + e}}$
(c) $\frac{{{\gamma _w}(G + w)}}{{1 + e}}$
(d) none of these
Where G is specific gravity, w is water content, ${\gamma _w}$ is unit weight of water and e is void ratio.

Q.10. A dry soil has a mass specific gravity of 1.35. If the specific gravity of solids is 2.7, then the void ratio will be
(a) 0.5
(b) 1.0
(c) 1.5
(d) 2.0 (IES 1996)

Answer:
1. c
2. b
3. c
4. b
5. b
6. d
7. a
8. b
9. b
10. b

Sunday, February 28, 2016

Soil Mechanics - Basic Concepts

Q.1. A dry soil sample has equal amounts of solids and voids by volume. Its ratio and porosity respectively will be
(a) 1.0, 100%
(b) 0.5, 50%
(c) 0.5, 100%
(d) 1.0, 50% (IES 2001)

Q.2. A truck can carry six cubic metres of loose earth at a void ratio of 1.4. This earth is to be excavated from a query where the void ratio e = 0.9. The volume of the earth in cubic metres which needs to be excavated would be
(a) 27/7
(b) 19/4
(c) 28/3
(d) 6 (IES 1992)

Q.3. A fill having a volume of 150,000 cum is to be constructed at a void ratio of 0.8. The borrow pit soil has a void ratio of 1.4. The volume of soil required(in cubic metres) to be excavated from the borrow pit will be
(a) 1,87,500
(b) 2,00,000
(c) 2,10,000
(d) 2,50,000 (IES 1997)

Q.4. In a wet soil mass, air occupies one sixth of its volume and water occupies one third of its volume. The void ratio of the soil is
(a) 0.25
(b) 0.5
(c) 1.00
(d) 1.50 (IES 1995)

Q.5. For a sand of uniform spherical particles, the void ratios in the loosest and densest states are
(a) 0.35 and 0.90
(b) 0.90 and 0.35
(c) 0.50 and 1.00
(d) 1.00 and 0.50 (GATE 1991)

Q.6. The ratio ${V_w}$ / ${V_v}$ is called( ${V_w}$ is volume of water and ${V_v}$ is volume of void)
(a) void ratio(e)
(b) porosity(n)
(c) degree of saturation(S)
(d) water content(w)

Q.7. If for a soil, degree of saturation is zero. The soil would be
(a) saturated soil
(b) partially saturated soil
(c) dry soil*
(d) over saturated soil

Q.8. If for a soil, degree of saturation is 100%. The soil would be
(a) saturated soil
(b) unsaturated soil
(c) dry soil
(d) partially saturated soil

Q.9. Water content of a soil is
(a) ratio between volume of water and volume of soil
(b) ratio between weight of water and weight of soil
(c) ratio between weight of water and volume of soil
(d) ratio between volume of water and weight of soil

Q.10. Weight of entire soil element divided by volume of entire is called
(a) dry density(or dry unit weight)
(b) bulk density(or bulk unit weight)
(c) saturated unit weight
(d) none of these

Answer:
1. d
2. a
3. b
4. b
5. b
6. c
7. c
8. a
9. b
10. b

Saturday, February 27, 2016

Soil Mechanics - Basic Concepts

Q.1. The ratio of void volume to total volume is called
(a) void ratio
(b) water content
(c) the degree of saturation
(d) none of these (IES 1992)

Q.2. In a soil sample, volume of voids to volume to solid is called
(a) void ratio
(b) porosity
(c) the degree of saturation
(d) none of these

Q.3. Porosity is usually expressed in
(a) ratio
(b) decimal value
(c) percentage
(d) any of these

Q.4. Void ratio is expressed in
(a) decimal value
(b) percentage
(c) both (a) and (b)
(d) none of these

Q.5. Value of void ratio
(a) is always less than unity
(b) is always more than unity
(c) can be more than unity
(d) none of these (GATE 1995)

Q.6. The void ratio(e) of a soil can have a value/range
(a) e $\le$ 0
(b) 0 < e < 1
(c) 0 $\le$ e $\le$ 1
(d) 0 < e (AMIE Winter97)

Q.7. The relationship between porosity(n) and void ratio(e) is
(a) n = 1 + e
(b) e = 1 + n
(c) n = e/(1 + e)*
(d) none of these

Q.8. The void ratio of a soil sample is 1, the corresponding porosity of the sample is
(a) 1.5
(b) 0.5*
(c) 2.00
(d) 2.5 (GATE 1994)

Q.9. The porosity of a soil sample is 20%, the void ratio is
(a) 0.20
(b) 0.80
(c) 1.00
(d) 0.25 (GATE 1997)

Q.10. The value of porosity of a soil sample in which the total volume of soil grains is equal to twice the total volume of voids would be
(a) 75%
(b) 66.66%
(c) 50%
(d) 33.33% (IES 2000)

Answers
1. d
2. a
3. c
4. a
5. c
6. d
7. c
8. b
9. d
10. d