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
Each question carries 1 mark
Negative marking: 1/4 mark
Time: 8 Minutes
Q1. The bottom diameter, top diameter and the height of a slump mould are …………
(a) 30 cm, 20 cm, 10 cm
(b) 10 cm, 30 cm, 20 cm
(c) 20 cm, 30 cm, 10 cm
(d) 20 cm, 10 cm, 30 cm
Q2. A soil sample has a porosity of 40%. The specific gravity of soil is 2.7. The dry density of the soil sample would be.
Q3. If the ratio of all the corresponding linear dimensions are equals, then the model and the prototype are said to have:
(a) Geometric similarity
(b) Kinematic similarity
(c) Dynamic similarity
(d) Static similarity
Q4. Creep is the gradual increase of
(a) plastic strain with time at constant load
(b) elastic strain with time at constant load
(c) plastic strain with time at varying load
(d) elastic strain with time at varying load
Q5. Which of the following is the correct sequence of plasticity of minerals in soil in an increasing order?
(a) Kaolinite, silica, montmorillonite, illite
(b) Kaolinite, silica, illite, montmorillonite
(c) Silica, kaolinite, illite, montmorillonite
(d) Silica, kaolinite, montmorillonite, illite
Q6. What is the mechanical widening required for a pavement of width 7m on a horizontal curve of radius 490m, if the longest wheel base of vehicle expected on the road is 7.0m?
(a) 0.07 m
(b) 0.05 m
Sol. Mould for slump –
Slump test is performed for measurement of workability.
Dry density (Υ_d )=?
Sol. Geomatic similarity ⇒ Ratio of all the corresponding linear dimensions is equal. In this each & every dimension of prototype is scaled in the same ratio.
Sol. Creep is the property of a specimen undergoes additional deformation with the passage of time under sustained loading within elastic limit. It cannot be recovered hence plastic in nature.
Sol. Increasing order of plasticity in clay mineral –
Silica → kaolinite → Illite → montmorillonite
Sol. Given, length of wheel base (l) = 7m
Radius (R) = 490m.
No. of lanes (n) = 2
mechanical widening W_me = (nl^2)/2R
= (2×(7)^2)/(2×490) = 0.1