Quiz: Civil Engineering
Each question carries 1 mark
Negative marking: 1/4 mark
Time: 8 Minutes
Q1. What is the tensile stress (in MPa) in a rod of cross section 20 mm × 30 mm, carrying an axial tensile load of 20 kN?
Q2. The plasticity to mould bricks in suitable shape is contributed by
Q3. As per the general rules for the measurement of a building, all works shall be measured subject to certain tolerance. In this regard the cubic contents shall be worked out to the nearest.
(a) 0.1 cu m
(b) 0.01 cu m
(c) 0.001 cu m
(d) 0.0001 cu m
Q4. The R.F. for 2 cm to a meter is –
Q5. Specific gravity of sand deposit is 2.50 having the void ratio 0.65 the critical hydraulic gradient for the sand deposit:
Q6. The velocity distribution for flow over a flat plate is given by u = (y-y²) in which u is velocity in meters per second at a distance ‘y’ meters above the plate. What is the shear stress value at y = 0.15m? the dynamic viscosity of fluid is 8.0 poise.
(b) 1.24 N/m²
(c) 0.56 N/m²
(d) 5.6 N/m²
Sol. Given that
Tensile load (σ)=20 kN
Cross-section (A) = 20 mm × 30 mm
Tensile stress =(tensile load)/Area
Sol. Alumina imparts plasticity to bricks. If it is in excess then shrinkage and warping of bricks takes place. The percentage of alumina in good brick earth is 20-30 %.
1.Linear measurement shall be measured nearest up to 0.01m.
2.Area shall be measured to the nearest 0.01 m²
3.Cubic contents shall be worked out to be nearest 0.01 m³
4.Wood work shall be measured. Nearest to 2 mm or 0.002m.
5.RCC work in slab/beams/columns measured nearest to 0.5 cm or 0.005m.
Sol. Representative fraction (R.F) = 2cm/1m
Critical hydraulic gradient (i)=(G-1)/(1+e)=(2.50-1)/(1+0.65)
Sol. We know that the shear stress is
τ= μ dv/dy
∵[dv/dy]_(y=0.15)=d/dy [ y-y^2 ]