Quiz: Civil Engineering
Each question carries 1 mark
Negative marking: 1/3 mark
Time: 10 Minutes
Q1. A 30 m, metric chain is found to be 0.1 m too short throughout the measurement. If the distance measured is recorded as 300 m, then the actual distance measured will be :
(a) 300.1 m
(b) 299.0 m
(c) 301.0 m
(d) 310.0 m
Q2. The depth of water below the spillway and after hydraulic jump are 1 m and 6m respectively. The head loss will be ……………
(a) 174 m
(b) 5.2 m
(c) 1.7 m
(d) None of these
Q3. The maximum safe permissible limit of sulphates in domestic water supply is
(a) 200 mg/l
(b) 600 mg/l
(c) 100 mg/l
(d) 500 mg/l
Q4. According to IS 456, the approximate estimated flexural strength (MPa) of concrete of grade M50 (fck = 50 MPa) would be:
Q5. The maximum allowable slenderness ratio for members carrying compressive load due to wind and seismic force only is
Q6. The correct sequence of workability test/method in the order of their application from low to high workability is
(a) vee-vee consistometer, compacting factor test and slump test
(b) slump test, compacting factor test and vee-bee consistometer
(c) compacting factor test, vee-bee consistometer and slump test
(d) vee-bee consistometer, slump test and compacting factor test.
Q7. At sharp horizontal curve of highways of radius ‘R’ (in metres), the percentage reduction in gradient provided to compensate the loss of traction force due to curvature is:
(d) None of these
Q8. If the pH of the water is more than 8.5, then which of the following chloramines will be
(a) Only monochloramine
(b) Only dichloramine
(c) Only trichloramine
(d) Both monochloramine and dichloramine
Q9. As per IS specifications, the nominal concrete cover for moderate exposure should not be less than…………..
(a) 20 mm
(b) 30 mm
(c) 45 mm
(d) 50 mm
Q10. You are asked to construct a massive concrete dam. The type of cement you will use is:
(a) Ordinary Portland cement
(b) Rapid hardening Portland cement
(c) Low heat cement
(d)Blast furnace slag cement
Sol. True length of chain (L) = 30 m.
False length of chain (L^1) = 29.9 m.
False length of chain (l^1) = 300 m.
True length of chain (l) = ?
S2. Ans. (b)
Sol. y_1 = 1 m.
y_2 = 6 m.
Head loss (h_L) = ((y_2-y_1)³)/(4y_1 y_2 )
= ((6-1)³)/(4 × 6 ×1)
h_L = 5.20 m
Sol. The maximum safe-limits in domestic water supply are:
Chloride ≤ 250 mg/l
Nitrates ≤ 45 mg/l
Sulphates ≤ 200 mg/l
Fluorides ≤ 1.5 mg/l
Sol. Flexure strength (fc) = 0.7√fck
Sol. maximum slenderness ratio
|(1)||A member carrying compressive load resulting from dead load & live load||180|
|(2)||A member subjected to compressive force resulting from combinations with wind load & earthquake load provided the deformation of such member does not effect any port of the structure.||250|
|(3)||Compressive flange of a beam laterally restrained against torsional buckling||300|
|Vee-bee consistometer test||Suitable for stiff concrete mixes having low and very low workability.|
|Compacting factor||Suitable for medium and low workability having compacting factor of 0.9 – 0.8 or slump 25 – 50 mm.|
|Slump test||Most widely used and suitable for medium to high workability having slump value 25 mm to 125 mm.|
Sol. At sharp horizontal curve of highways of radius ‘R’, the percentage reduction in gradient provided to compensate the loss of traction force due to curvature is 75/R. Grade compensation is applicable for horizontal curve with gradient.
|Exposure condition||Minimum grade||Minimum cover|
Sol. Low heat cement is preferred to construct a massive concrete dam because it has less heat of hydration.