DFCCIL’21 CE: Daily Practice Quiz. 19-July-2021

Quiz: Civil Engineering
Exam: DFCCIL-JE
Topic: MISCELLANEOUS

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

Q1. A compression member is termed as column or strut if the ratio of its effective length to the least lateral dimension is more than
(a) 1
(b) 2
(c) 3
(d) 5

Q2. A cantilever of length (L) carries a concentrated load (W) at the free end. If the length of the cantilever is doubled, the deflection at the free end, for the same load will be:
(a) 2 times
(b) 4 times
(c) 6 times
(d) 8 times

Q3. To prevent sulphate attack in concrete, for preparing concrete mix, water pH must be within:
(a) 5 – 7
(b) 6 – 9
(c) 7 – 10
(d) 4 – 6

Q4. A water treatment plant treats 6000 m³ of water per day. If it consumes 20 kg chlorine per day, then the chlorine dosage would be
(a) 3.00 mg/l
(b) 3.75 mg/l
(c) 4.25 mg/l
(d) 3.33 mg/l

Q5. The hardness that is equivalent to alkalinity is known as –
(a) total hardness
(b) carbonate hardness
(c) non carbonate hardness
(d) psendo hardness

Q6. Pseudo-plastic substance are non-Newtonian fluids for which:
(a) dynamic viscosity increases as the rate of shear increases
(b) Dynamic viscosity decreases with the time for which shearing forces applied
(c) Dynamic viscosity increases with time for which shearing force applied.
(d) Dynamic viscosity decreases as the rate of shear increases

SOLUTION

S1. Ans.(c)
Sol. The ratio of effective length & least lateral dimension for column is greater then ‘3’.
Slenderness ratio (λ )= leff/(L.L.D.)
λ < 12 → short column
λ ≥12 → Long column

▭(∆_2= 8∆_1 )

S3. Ans.(b)
Sol. the P^H value of water should not be less then ‘6’
S4. Ans.(d)
Sol. Quantity of water treated per day = 6000 m³
Quantity of chlorine consumed per day = 20 kg.
Chlorine dosage = (Consumed chlorine per day)/(Quantity of water treated per day)
= (20×10^6 mg.)/(6000× 10^3 l.)
= 3.33 mg/l.

S5. Ans.(b)
Sol. the hardness that is equivalent to alkalinity is known as carbonate hardness. It is also termed as temporary hardness. carbonate hardness is also defined as the minimum of these two i.e. alkalinity and total hardness.

Which indicates that as the rate of shear increases than dynamic viscosity is decreases.

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