NHPC-JE'21 CE: Daily Practices Quiz. 15-Nov-2021

Know your strengths and practice your concepts with this quiz on NHPC JE Recruitment 2021. This quiz for NHPC JE Recruitment 2021 is designed specially according to NHPC Syllabus 2021.

Quiz: Civil Engineering
Exam: NHPC-JE
Topic: Miscellaneous

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

Q1. The ingredient of paint which are used to hide the surface irregularities and imparts color is known as__________.
(a) Adultrants
(b) Drier
(c) Pigments
(d) Solvents

Q2. The weight of a 20 mm dia, bar per meter length is approximately:
(a) 2.47 kg
(b) 2.98 kg
(c) 3.85 kg
(d) 1.85 kg

Q3. A stream has flow of 20 cumecs and BOD concentration of 10 mg/I receive the industrial waste water having flow of 1.5 cumecs and BOD concentration of 250 mg/I. What is the BOD concentration (mg/l) of stream at downstream point of meeting of stream with industrial waste?
(a) 2.67
(b) 12.09
(c) 13
(d) 26.74

Q4. Which one of the following assumptions in the theory of pure torsion is false?
(a) The twist is uniform along the length
(b) The shaft is of uniform circular section throughout
(c) Cross-section plane before torsion remain plane after torsion
(d) All radii get twisted due to torsion

Q5. Which of the following types of rain-gauge is used for measuring rain in remote areas?
(a) Tipping bucket type
(b) Weighing bucket type
(c) Floating type
(d) Simon’s rain-gauge

Q6. A sand deposit has a porosity of 1/3 and its specific gravity is 2.5. The critical hydraulic gradient to cause sand boiling in the stratum will be
(a) 1.5
(b) 1.25
(c) 1.0
(d) 0.75

Solutions

S1. Ans.(c)
Sol. Pigments is used to hide the surface irregularities and imparts desired color to paints.

S2. Ans.(a)
Sol. The weight of bar per metre length is given by-
M/L=d^2/162=0.00618d^2
= 0.00618×(20)²
= 2.472 kg

S3. Ans.(d)
Sol. Given Q_stream=20 cumecs
Q_waste=1.5 cumecs
BOD_stream=10 mg/l
BOD_waste=250 mg/l
BOD_mix= ?
BOD_mix=(Q_stream×BOD_stream+Q_Waste×BOD_waste)/(Q_Stream+Q_waste )
= (20×10+250×1.5)/(20+1.5)
= 26.74 mg/l.

S4. Ans.(a)
Sol. We know that, the torsion equation
T/J=τ/r=Gθ/L
θ=TL/GJ
θ α L
Twist is varying with the length linearly so it is not uniform throughout the length.

S5. Ans.(a)
Sol. Tipping bucket type of rain gauge is used for measuring rain in remote areas. It is recording type of rain gauge means produce continuous plot of rainfall against time.

S6. Ans.(c)
Sol. Porosity (n) = 1/3
G = 2.5
Critical hydraulic gradient (i_c) = ?
e = n/(1-n )=(1\/3)/(2\/3)=0.5
▭(e=0.5)
i_c=(G-1)/(1+e)=(2.5-1)/(1+0.5)=1.5/1.5
▭(i_c=1 )