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NHPC-JE’21 CE: Daily Practices Quiz. 16-Sep-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. What shall be the minimum effective throat thickness of a fillet weld in case of structural steel design?
(a) 4 mm
(b) 3 mm
(c) 5 mm
(d) 2 mm

Q2. Which of the following test is not used to for building stones?
(a) Hardness test
(b) Acid Test
(c) Crystallization test
(d) Color test

Q3. Which of the following is added as a vehicle in paints?
(a) Read lead
(b) White lead
(c) Turpentine oil
(d) Tung oil

Q4. A rod of dimension 20 mm × 20 mm is carrying an axial tensile load of 10 kN. The tensile stress developed is _________.
(a) 0.025 MPa
(b) 0.25 MPa
(c) 25 MPa
(d) 250 MPa

Q5. The intensity of pressure developed by surface tension of 0.075 N/m in a droplet of water of 0.075 mm diameter is-
(a) 0.8 N/ cm²
(b) 0.6 N/ cm²
(c) 0.4 N/ cm²
(d) 400 N/ cm²

Q6. Turbidity is the measure of relative clarity of a liquid (water), and one of its units of measurement is
(a) MPN
(b) NTU
(c) Moles
(d) Grams

Solutions

S1. Ans.(d)
Sol. ▭(Throat Thickness (t)=kS)
k → Throat coefficient
S → size of weld.
→ Minimum size of weld up to 10 mm thick plate equal to 3 mm.
→ Throat coefficient for 60° angle between fusion faces equal to 0.7
So, Throat Thickness (t) = 0.7 × 3
= 2.1 mm.

S2. Ans.(d)
Sol. Color test is not used for building stone
→ There are some tests used for building stone-
1.Smith’s test → It is used to find out presence of soluble matters in stone.
2.Acid test → It is used to investigate that how much atmospheric action can be resisted by stone.
3.Crystalline test → It is used to determine the durability and weathering quality of stone.
4.Specific gravity test → It is used to find the specific gravity of stone.
5.Crushing strength test → It is used to find the Crushing strength of stone.
6.Attrition test → It is used to find out rate of wear of stone.

S3. Ans.(d)
Sol. Vehicle/Carrier/Binder → It is a liquid substance which is used with base. The main function of vehicle is to hold the solid ingredient of paint in suspension. They act as binder in paint. It also helps in spreading of paints evenly.
Ex. Linseed oil, Tung oil, Nut oil etc.

S4. Ans.(c)
Sol. Tensile stress in an axial rod of dimension 20 mm × 20mm = P/A=(10×10^3)/(20×20×10^(-6) )
σ_axial=25MPa

S5. Ans. (c)
Sol. ΔP = 2σ/R
= (2 ×0.075 × 2 ×10 )/(0.075 × 100)
= 0.4 N/cm²

S6. Ans.(b)
Sol. As per GOI, the turbidity of water is measured in NTU (Nephelometric turbid unit). The permissible limit of turbidity in in drinking water is 1-10 NTU.

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