QUIZ: CIVIL ENGINEERING 29 Jan 2021

Quiz: CIVIL ENGINEERING
Exam: NPCIL-SCIENTIFIC ASSISTANT (CIVIL)
Topic: MISCELLANEOUS

Each question carries 1 mark
Negative marking: No negative marking
Time: 10 Minutes

Q1. Sewage sickness occurs when
(a) Sewers get clogged due to accumulation of solids
(b) Voids of soil get clogged due to continuous application of sewage on a piece of land
(c) Sewage contains pathogenic organisms
(d) Sewage enters the water supply system

Q2. Slate, laterite, and kaoline are example of which type of stone?
(a) Argillaceous rock
(b) Siliceous rock
(c) Sedimentary rock
(d) Igneous rock

Q3. For a given elastic material, the elastic modules E is 210 GPa and its Poisson’s Ratio is 0.27. What is the approximate value of its modules of rigidity?
(a) 105 GPa
(b) 83 GPa
(c) 159 GPa
(d) 165 GPa

Q4. The following three stages are known to occur in the biological action involved in the process of sludge digestion.

  1. Acid fermentation
  2. Alkaline fermentation
  3. Acid regression
    The correct sequence of three stages is
    (a) 3, 1, 2
    (b) 1, 2, 3
    (c) 2, 3, 1
    (d) 1, 3, 2

Q5. A material has identical properties in all directions is said to be
(a) Homogeneous
(b) Isotropic
(c) Anisotropic
(d) Orthotropic

Q6. Minimum diameter of a longitudinal reinforcement in a RCC column as per IS codal provisions shall be:
(a) 16 mm
(b) 12 mm
(c) 10 mm
(d) 8 mm

Q7. Double mass curve technique is followed to
(a) check the consistency of rain gauge record
(b) find the average rainfall over a number of year
(c) find the number of rain gauge required
(d) estimate the missing precipitation values

Q8. If the fore bearing of the line AB is 119°48’ then back baring is:
(a) 299° 48’
(b) 209°48’
(c) 119°48’
(d) 319°48’

Q9. In tri-axial compression test, the deviator stress is given by
(a) σ_1+σ¬¬_3
(b) σ_1-σ_3
(c) 1/2 (σ_1+σ_3)
(d) 1/2 (σ_1-σ_3)

Q10. Newton’s law of viscosity is a relationship between-
(a) Rate of shear strain & temperature
(b) Shear stress & rate of shear strain
(c) Pressure, velocity & temperature
(d) Shear stress & velocity

Solutions

S1. Ans.(b)
Sol. Sewage sickness occurs when voids of soil get clogged due to continuous application of sewage on a piece of land.
There are some preventive measures of sewage sickness are-
(i) Choice of land
(ii) Giving rest to land and rotation of crops
(iii) Primary treatment of sewage.

S2. Ans.(a)
Sol. Argillaceous rocks→ The principal compound in argillaceous rocks is clay (Alumina).
Ex. Slate, laterite and Kaoline.

Siliceous rocks→ The principal compound in Siliceous rocks is Silica.
Ex. Granite, Sandstone and Quartzite.

S3. Ans.(b)
Sol. Given, Elastic modulus (E) = 210 GPa
Poison ratio (μ) = 0.27
Modulus of rigidity (G) = ?
E = 2G(1+μ)
G =E/2(1+μ)
=210/2(1+0.27)
▭(G=82.67 GPa≈83 GPa)

S4. Ans.(a)
Sol. The correct sequence of three stages in sludge digestion process:
(i) Acid regression
(ii) Acid fermentation
(iii) Alkaline fermentation

S5. Ans.(b)
Sol. Isotropic → A material is said to be isotropic when it has same properties in all direction.
Anisotropic → A material is said to be anisotropic when it has different properties in all direction.
Homogenous → Same property at each cross-section.
Orthotropic → Different property in three mutually perpendicular direction.

S6. Ans.(b)
Sol. In column minimum diameter for longitudinal reinforcement is 12mm. for Transverse reinforcement minimum diameter is 6 mm.

S7. Ans.(a)
Sol. Double mass curve technique is followed to check the consistency of rain gauge record. It is used to correct the inconsistency of precipitation records.

S8. Ans.(a)
Sol. fore bearing of line ‘AB’ = 119°48’
Fore baring is less than 180° so we calculate back bearing by adding 180°. If fore bearing greater than 180° than we subtract 180° from it.
Back bearing of line AB = 180°+〖119°48〗^’=〖299°48〗^’

S9. Ans.(b)
Sol. In tri-axial compression test →
Minor principal stress = confining pressure
σ_C=σ_3
Major Principal stress σ_1=σ_2+σ_d
σ_d is deviator stress
∵ ▭(σ_d=σ_1-σ_3 )

S10. Ans.(b)
Sol. Newton’s law states that the shear stress is directly proportional to the rate of shear strain for Newtonian fluid.
τ α dv/dy
▭(τ=μ.dv/dy)

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