DFCCIL’21 CE: Daily Practice Quiz. 17-July-2021

Quiz: Civil Engineering
Exam: DFCCIL
Topic: Miscellaneous

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

Q1. If a point load acting at the mid span of a fixed beam of uniform section produces fixed end moment of 60 kNm, then same load spread uniformly over the entire span will produce fixed end moments equal to:
(a) 20 kNm
(b) 30 kNm
(c) 40 kNm
(d) 45 kNm

Q2. The amount of oxygen available in the effluent in any form to the total amount of oxygen required in 1st stage of BOD is
(a) Theoretical oxygen demand
(b) Total organic carbon
(c) Relative stability
(d) Relative BOD

Q3. The meniscus and dispersing agent corrections, in the hydrometer analysis, respectively are
(a) Positive and negative
(b) Negative and positive
(c) Positive and positive
(d) Negative and negative

Q4. If E_c and E_s are modulus of elasticity of concrete and steel respectively, then the modular ratio (m) will be
(a) E_c/E_s
(b) E_s/E_c
(c) (E_c+E_s)/(E_s-E_c )
(d) (4E_c)/E_s

Q5. The representative fraction of the scale 1 cm = 100 km will be:
(a) 1/10000
(b) 1/100
(c) 1/100000
(d) 1/10000000

Q6. The operation of converting lime stone into quick lime by heating it to temperatures up to 900° C and releasing carbon dioxide is known as:
(a) Calcining
(b) Hydrating
(c) Drawing
(d) Charging

Solutions

S1. Ans.(c)
Sol. If a point load acting at the mid span of a fixed beam, then fixed end moment will be
M=wl/8=60 kN.m (given)—(1)
Give, same load spread as UDL then fixed end moment will be –
M^’=(wl^2)/12
=(w×l×l)/12
=Wl/12 (∵W=w×l)
1/12×wl/8×8
=1/12×60×8 (wl/8=60 from eq^n (1)
▭(M^’=40 kN.m)

S2. Ans.(c)
Sol. ▭(Relative stability (S_r )=(Amount of oxygen available in effluent)/(Total amount of oxygen required in 1st stage BOD))

S3. Ans.(a)
Sol. The observed hydrometer reading is further being corrected by following –
Meniscus correction (Cm)
Temperature correction (C_T )
Dispersing agent correction (C_D )
→ Meniscus correction is always positive & dispersing agent correction is always negative.
→ If temperature greater than 27°c then temperature correction is Positive and when temperature is less than 27°C then temperature correction is negative.

S4. Ans.(b)
Sol. ▭(Modular Ratio (m)=(Modulas of elasticity of steel(E_s ))/(Modulus of plasticity of concrete(E_c ) ))
E_s=2×10^5 N\/mm^2
E_c=5000 √fck (Acc. To IS 456:2000)

S5. Ans.(d)
Sol. 1 cm = 100 km.
1 cm = 100,000,00 cm
▭(R.F.1/100,000,00)

S6. Ans.(a)
Sol. Calcining is the process of converting limestone into quick lime by heating it to temperature up to 900°C and releasing carbon di-oxide. It is also known as calcination.

CaCO_3 —————— CaO+CO_2
CaCO_3=Limestone or Calcium Carbonate
CaO=Quick lime

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