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RSMSSB-JE’21 CE: Daily Practices Quiz. 24-Aug-2021

Quiz: Civil Engineering
Exam: RSMSSB-JEn
Topic: Miscellaneous

Each question carries 1 mark
Negative marking: 1/3 mark
Time: 8 Minutes

Q1. Coefficient of permeability of soil varies approximately as
(a) D_10^2
(b) √(D_10 )
(c) D_10^3
(d) D_10^(3\/2)

Q2. If specific yield of particular sand is 30% and its porosity is 50%, then the specific retention of the sand will be
(a) 80%
(b) 55%
(c) 40%
(d) 20%

Q3. The thin wall cylindrical vessel has the wall thickness t and diameter d is subjected to the gauge pressure of p. if the diameter of the vessel is doubled, then what is the ratio of hoop stress as compared to initial value?
(a) 1: 1
(b) 2: 1
(c) 1: 2
(d) 1: 4

Q4. The type of aggregates not suitable for high strength concrete and for pavements subjected to tension is
(a) Round aggregates
(b) Irregular aggregates
(c) Angular aggregates
(d) Flaky aggregates

Q5. At a hydraulic jump, the depths at the two sides are 0.4 m and 1.4 m. The head loss in the jump is nearly?
(a) 1.0 m
(a) 0.9 m
(c) 0.7 m
(d) 0.45 m

Q6. If the distance between two-point A and B is 1 km, the combined correction for curvature and refraction will be
(a) 0.6730 m
(b) 0.06735
(c) 1.0673
(d) 1.6730

Solutions

S1. Ans.(a)
Sol. ▭(Coefficient of permeability (K)=100 D_10^2 )
▭(KαD_10^2 )

S2. Ans.(d)
Sol. Given,
Specific yield (S_y) = 30%
Porosity (n) = 50%
Specific retention (SR) =?
S_y+S_R=n
30%+S_R= 50%
S_R=20%

S3. Ans.(b)
Sol.
σ_h1=pd/2t
σ_h2=P(2d)/2t
σ_h1/σ_h2 =(P(2d)\/2t)/(pd\/2t)=2/1
σ_h1:σ_h2=2∶1

S4. Ans.(a)
Sol. Rounded aggregates have poor interlocking bond hence they are not suitable for high strength concrete and pavements subjected to tension.

S5. Ans.(d)
Sol. Given, conjugate depths y_1=0.4 m.
y_2=1.4 m.
E_L= ?
E_L=(y_2-y_1 )^3/(4y_1 y_2 )
=(1.4-0.4)^3/(4×1.4×0.4)
▭(E_L=0.446≈0.45m)

S6. Ans.(b)
Sol. Combined correction due to curvature & Refraction (Cc) =0.0673 d^2
=0.0673×1^2
=0.0673 m

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