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MCQ
21661. 1.5m × 1.0m × 2.0m আয়তনের একটি বস্তুর পানিতে ওজন 3000kg; এর Specific gravity কত? [MOCA-19]
0.8
0.9
1.0
1.1
ব্যাখ্যা: Specific gravity =তরলের ওজন/ সমআয়তনের পানির ওজন = 3000/(3 * 1000) = 1
21662. একটি Soil নমুনার Voids volume = Solids Volume হলে Porosity কত? [MOLE - 19 ]
0.5
1.0
2.0
ব্যাখ্যা: Viod ratio, e = V_(v )/V_(s ) =1 again , n=e/1+e = 1/1+1 = 0.5
21663. The water content in a soil at which just shear strength develops is called-
liquid limit
elastic limit
plastic limit
shrinkage limit
21664. The plasticity index is the ratio of liquidity index and flow index.
Right
Wrong
21665. Which of the following have an influence on the value of permeability?
Grain size
Void ratio
Degree of saturation
all of these
21666. The plastic limit exists in-
sandy soils
gravel soils
silty soils
clays
21667. The unconfined compressive strength of a very soft clay is-
10 to 25kN/m²
150 to 400kN/m²
25 to 150kN/m²
above 400kN/m²
21668. Triaxial apparatus কোন test-এর জন্য ব্যবহৃত হয়? [MOCA-19]
Unconsolidated undrain
Consolidated undrain
Drained
সবগুলো
21669. The liquid limit exists in-
sandy soils
gravel soils
silty soils
clays
21670. The sensitivity of a normal clay is about-
2 to 4
8 to 15
4 to 8
15 to 20
21671. The liquid limit minus plastic limit is termed as-
flow index
plasticity index
shrinkage index
liquidity index
21672. একটি মাটির Porosity ০.৪৫ হলে Void ratio কত? [LGED-19]
০.৩১
১.২২
০.৪১
০.৮২
ব্যাখ্যা: e = n/(1 - n) = (0.45)/(1- 0.45) =0.82
21673. Shrinkage index কী? [MOCA-19]
Liquid limit - Shrinkage limit
Liquid limit + Plastic limit
Plastic limit - Liquid limit
Shrinkage limit - Liquid limit
ব্যাখ্যা: মৃত্তিকার তারল্য সীমা এবং সংকোচন সীমার পার্থক্যকে সংকোচন সূচক বলে। অর্থাৎ, SI = LL - SI Shrinkage index = Liquid limit - Shrinkage limit.
21674. The liquidity index (in percentage) is given by-
(ω_p-ω)*100/I_p
(ω_L-ω)*100/I_p
(ω_L-ω_p )*100/I_p
(ω-ω_p )*100/I_p
ব্যাখ্যা: Here, ω = Natural water content ω_p = Plastic limit I_p= Plasticity index
21675. The unconfined compressive strength of a hard clay is-
10 to 25kN/m²
150 to 400kN/m²
25 to 150kN/m²
above 400kN/m²
21676. The unit weight of a completely saturated soil (γ_sat) is given by-
((G+e)γ_ω)/(1+e)
((1+e)γ_ω)/(G+e)
((G-1)γ_ω)/(1+e)
((1-e)γ_ω)/(G+e)
21677. বিদ্যমান Over-burden pressure-এ মাটি যদি Fully consolidated না হয়, তখন তাকে কী বলে? [MOCA-19]
Pre-consolidated
Normally consolidated
Over consolidated
কোনোটিই নয়
21678. When the consistency index is zero, then the soil is at its-
elastic limit
plastic limit
liquid limit
semi-solid state
21679. The relation between dry unit weight (γ_d), S.G. (G), void ratio (e) or porosity N is-
γ_d=(Gγ_ω)/(1+e)
γ_d=(Gγ_ω)/(1-e)
γ_d=Gγ_ω (1-n)
γ_d=Gγ_ω (1+n)
21680. Which of the following is highly permeable?
Gravel
Sand mixture
Coarse sand
Clay