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DFCCIL’21 CE: Daily Practice Quiz. 07-Aug-2021

Quiz: Civil Engineering
Exam: DFCCIL
Topic: Miscellaneous

Each question carries 1 mark
Negative marking: 1/4 mark
Time: 8 Minutes

Q1. If L is the length of rail and R is the radius of a curve, the versine of the curve is
(a) h = L^2/4R
(b) h = L^2/8R
(c) h = L^2/16R
(d) h = L^2/32R

Q2. Match List – I (term) with List – II (Brief description) and select the correct answer using the codes given below the list:
List – I
A. Heart shakes
B. Knot
C. Rot
D. Sap wood
List – II
1. Disintegration caused by fungi
2. Cracks widest at centre and diminishing towards the outer circumference
3. Outer layers of a log of wood
4. A branch base embedded in timber by natural growth.

Codes:

A          B          C          D

(a)        2          4          3          1

(b)        2          4          1          3

(c)        1          3          2          4

(d)        1          2          3          4

Q3. In a closed helical spring subjected to an axial load, other quantities remaining the same, if the wire diameter is doubled and mean radius of the wire diameter is doubled and mean radius of the coil is also doubled, then stiffness of spring when compared to original one will become________.
(a) Twice
(b) Four times
(c) Eight times
(d) Sixteen times

Q4. Which one of the following defines Aridity index (AI)?
(a) AI=(PET-AET)/PET×100
(b) AI=PET/AET×100
(c) AI=AET/PET×100
(d) AI=(AET-PET)/AET×100
(where AET = Actual Evapotranspiration and PET = Potential Evapotranspiration)

Q5. A soil sample is having a specific gravity 2.60 and a void ratio of 0.78. The water content required to fully saturate, the soil at the void ratio would be
(a) 10%
(b) 30%
(c) 50%
(d) 70%

Q6. The volume (in milliliters) occupied by aerated mixed liquor containing one gram of dry solids after setting for 30 minutes is termed as:
(a) Allowable solids content
(b) Sludge volume index
(c) Liquor index
(d) Chlorination limit

Solutions

S1. Ans.(b)
Sol. Versine of curve having Length (L) and radius (R) is given by–
▭(h=L^2/8R)

S2. Ans.(b)
Sol. Heart shakes → Cracks widest at center and diminishing towards the outer circumference.
Knot → A branch base embedded in timber by natural growth.
Rot → Disintegration caused by fungi.
Sap wood → Outer layers of a log of wood.

S3. Ans.(a)
Sol. Spring stiffness, K=(Gd^4)/(8D^3 N)
K^’=(G×2^4.d^4)/(8×2^3×D^3 N)=2[(Gd^4)/(8D^3 N)]
=2K

S4. Ans.(a)
Sol. ▭(Aridity Index (AI)=(PET-AET)/PET×100)
Where, AET = Actual Evapotranspiration
PET = Potential Evapotranspiration

S5. Ans.(b)
Sol.
Specific gravity (G)=2.60
Void ratio (e)=0.78
Water content (w)=?
Fully saturated i.e. S=1
se=wG
1×0.78=w×2.60
▭(w=30%)

S6. Ans.(b)
Sol. Sludge volume index → Sludge volume index is defined as volume occupied in ml. by 1 gm. Of solid in the mix liquor when allow to settle for 30 min.
▭(SVI=(Settled Sludge volume (ml))/(MLSS(gm.)))

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