RSMSSB-JE'21 CE: Daily Practices Quiz. 07-Aug-2021

Quiz: Civil Engineering
Exam: RSMSSB-JEn
Topic: Miscellaneous

Each question carries 1 mark
Negative marking: 1/3 mark
Time: 8 Minutes

Q1. If the radial acceleration of transition curve is 30cm/sec², radius is 200m and the velocity is 14m/sec. the length of the transition curve is
(a) 46.0 m
(b) 46.5 m
(c) 45.0 m
(d) 45.5 m

Q2. In the coefficient of passive earth pressure is 1/3 then the coefficient of active earth pressure is:
(a) 1/3
(b) 1
(c) 3/2
(d) 3

Q3. As per the working stress method of reinforced concrete design, if a concrete has permissible compressive stress of p, then the modular ratio is approximately given as:
(a) 93/p
(b) 140/p
(c) 210/p
(d) 280/p

Q4. Poisson’s ratio is defined as the ratio of
(a) longitudinal stress and longitudinal strain
(b) longitudinal stress and lateral stress
(c) lateral strain and longitudinal strain
(d) lateral stress and lateral strain

Q5. When waste water is disposed of into a running stream, four zones are formed. In which of the following zones will the minimum level of dissolved oxygen be found?
(a) Zone of degradation
(b) Zone of active decomposition
(c) Zone of recovery
(d) Zone of clear water

Q6. Oleic acid may be used in the manufacture of:
(a) White cement
(b) Hydrophobic cement
(c) Anti-bacterial cement
(d) Portland pozzolana cement

Solutions
S1. Ans.(a)
Sol. C = 30 cm/sec²
= 0.30 m/sec²
R = 200 m.
V = 14 m/sec.
Length of transition curve (L) = V^3/(C.R)
= (14)^3/(0.3×200)
= 45.7 m.
= 46 m.

S2. Ans.(d)
Sol. ▭(K_p=1/3)
K_a= ?
K_a.K_p=1
K_a×1/3=1
▭(K_a=3)

S3. Ans.(a)
Sol. modular ratio (m) =280/3σcbc
▭(σcbc=p)
M=280/3p
▭(m=93/p)

S4. Ans.(c)
Sol. Poisson’s ratio is defined as the ratio of lateral strain to longitudinal strain
Poisson^’ sratio (μ)=(lateral strain)/(Longitdinal strain)

S5. Ans.(b)
Sol. There are four zones are formed when waste water is disposed off into a running stream
1. Zone of degradation
2. Zone of active decomposition
3. Zone of recovery
4. Zone of clear water
In zone of active decomposition water is more dark and more turbid and dissolved oxygen may go up to zero.

S6. Ans.(b)
Sol. Hydrophobic cement → A film of stearic acid and oleic acid is formed which reduces the rate of deterioration of cement during long storage.