Quiz: Civil Engineering 24 june 2020

Quiz: Civil Engineering
Topic: Miscellaneous

Each question carries 1 mark
Negative marking: 1/4 mark
Time: 10 Minutes

Q1. In Versenate method (Hardness test) the water is titrated against EDTA salt solution using Eriochrome Black T as indicator solution. Here at the end titration, the color changes from
(a) Wine red to blue
(b) Blue to sea green
(c) Yellow to blue
(d) Blue to yellow

Q2. Plain cement concrete is strong in taking:
(a) Tensile stresses
(b) Compressive stresses
(c) Shear stresses
(d) Tear stresses

Q3. If pan evaporation is denoted E_p and actual evaporation by E, then
(a) E_p>E
(b) E>E_p
(c) E = E_p
(d) E ≷ E_p

Q4. If the coefficient of permeability for the soil is 10^(-7)cm/sec, then the soil can be classified as
(a) clay
(b) silt
(c) sand
(d) gravel

Q5. Minimum reinforcement in circular concrete column as per IS – 456 is –
(a) 4 bars of 12 mm
(b) Greater 0.80% of cross – sectional area 4 bars of 12 mm
(c) 6 bars of 12 mm
(d) Greater of 0.80% of cross – sectional area and 6 bars of 12 mm

Q6. Gradually varied flow is
(a) Steady uniform
(b) non-steady non-uniform
(c) non-steady uniform
(d) steady non-uniform

Q7. The method of levelling used to carry out reconnaissance of area is:
(a) Check levelling
(b) Fly levelling
(c) Profile levelling
(d) Simple levelling

Q8. In which of the following studies desire lines is used
(a) Speed studies
(b) Origin and destination studies
(c) Accident studies
(d) None of the above

Q9. Compound of cement which reacts immediately with water and sets first
(a) Tricalcium silicate
(b) Tricalcium aluminate
(c) Dicalcium silicate
(d) All of the above

Q10. The point of contraflexure is the point where:
(a) bending moment changes sign
(b) bending moment is maximum
(c) bending moment is minimum
(d) shear force is zero


S1. Ans.(a)
Sol. In versenate method (hardness test), when the water is titrated against EDTA salt solution using Eriochrome Black T as indicator, Then the color of solution changes from wine red to blue.

S2. Ans.(b)
Sol. The concrete in which no reinforcement is provided called plain concrete. Plain concrete is strong in taking Compressive stresses. The tensile strength of concrete is 10 to 15% of compressive strength.

S3. Ans.(a)
Sol. If pan evaporation is E_p and actual evaporation is E, then E_p>E
Pan coefficient (C_p )=(Lake evaporation)/(Pan evaporation)

S. no. Pan Pan co-efficent (C_p)
1. Class-A 0.7
2. Indian Standard 0.8
3. Colorado Sunken 0.78

S4. Ans.(a)
Soil                              Coefficient of permeability (Cm/sec)
Gravel                                                 > 1
Sand                                                1 – 10^(-3)
Silt                                               10^(-3)- 10^(-6)
Clay                                                 < 10^(-6)

S5. Ans.(d)
Sol. → minimum % reinforcement in column = 0.8% of gross area
→ max^m % reinforcement = 4% of gross area (if bar’s are lapped)
= 6% of gross area (it bar’s are not lapped)
→ No. of bar’s in circular column equal to ‘6’
→ No. of bar’s in rectangular column equal to ‘4’

S6. Ans.(d)
Sol. Gradually varied flow is steady non-uniform flow with the condition that depth will be constant because there is no change in velocity with respect to time.

S7. Ans.(b)
Sol. fly levelling is used for reconnaissance of the area. Purpose of this levelling for determination of approximate elevation of points.

S8. Ans.(b)
Sol. desire lines is used in Origin and destination studies.

S9. Ans.(b)
Sol. Tricalcium aluminate is responsible for flash setting of cement.

S10. Ans.(a)
Sol. Point of contraflexure (POC) is the point where bending moment changes sign.
→ When function changes from concave to convex or vice versa that point is called point of inflection.


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