Quiz: Civil Engineering
Exam: RSMSSB-JEn
Topic: Miscellaneous
Each question carries 1 mark
Negative marking: 1/3 mark
Time: 8 Minutes
Q1. An area of a field is 250 square centimeters from a shrunk map having shrunk factor of 0.9. Calculate the original area (Square meters) on the field, if the original scale of the map is 1 cm = 50m.
(a) 309
(b) 625000
(c) 694444
(d) 771600
Q2. A cohesive soil yields a maximum dry density of 16 kN/m³ during a standard proctor Compaction test. What would be its void ratio the specific gravity is 2.60 –
(a) 0.552
(b) 0.625
(c) 0.712
(d) 0.583
Q3. The pressure sustained per unit deformation of subgrade at specified deformation level using specified plate size is termed as
(a) CBR
(b) Safe bearing capacity
(c) Tangent modulus
(d) Modulus of subgrade reaction
Q4. In a Sutro weir, the discharge is proportional to
(a) H^(1/2)
(b) H^(3/2)
(c) H^(5/2)
(d) H^
Q5. The detention period of a septic tank is of the order of
(a) 2-6 hours
(b) 2-4 hours
(c) 12-36 hours
(d) 4-8 hours
Q6. As per IS:800-1984, what is the axial tension for mild steel power driven rivets?
(a) 100 Mpa
(b) 250 Mpa
(c) 415 Mpa
(d) 1000 Mpa
Solutions
S1. Ans.(d)
Sol. Measured Area of field on map = 250 cm²
Shrinkage factor (S.F) = 0.9
Original scale (S) = 1 cm = 50 m.
Original area of map =(Measured area )/(S.F.)^2
=250/(0.9)^2
=308.64 cm^2
Scale (S) = 1 cm = 50 m.
Hence, Area of field = 308.64 × (50)^2 = 771600 m²
S2. Ans.(b)
Sol. dry density (r_d )= 16kN/m³
G= 2.60
r_d=(Gr_w)/(1+e)
1+e=(2.60×9.81)/16
e=0.5941
▭(e=0.60)
S3. Ans.(d)
Sol. The pressure sustained per unit deformation of subgrade at specified deformation level using specified plate size is termed as modulus of subgrade reaction.
▭(Moduius of subgrade reaction (K)=(pressure (P))/(Deflection (D)))
(unit = kg/m³)
It is generally calculated at 0.125 cm or 1.25 mm.
S4. Ans. (d)
Sol. Relation for discharge over weir
Q ∝ H^n
n = 3/2 for Reatangular weir
n = 5/2 for triangular weir
n = 1 for Proportional or Sutro weir
S5. Ans.(c)
Sol. The detention period of septic tank is 12 to 36 hours.
S6. Ans.(a)
Sol. Maximum permissible stress.
| Axial tension | Shearing | Bearing | |
| Power driven Shop rivet | 100 | 100 | 300 |
| Hand driver shop rivet | 80 | 80 | 250 |
