SSC-JUNIOR ENGINEER (Civil & Structural) Online Exam 2020 (Exam held on 23/03/2021) (Part-IV)

GENERAL ENGINEERING CIVIL AND  STRUCTURAL

Total Questions: 50

21. On a right angle two-lane road intersection with two-way traffic, the total number of potential conflict points are:

Correct Answer: A. 24
Solution:Number of possible conflict points at any intersection depends on the number of approaches, turning movements and type of traffic control at the intersection.

22. Select the INCORRECT obstacle in chaining in a chain survey.

Correct Answer: B. Obstacle to plotting
Solution:Obstacles to plotting or levelling is not a kind of obstacles to chaining. Obstacles of chaining are of three kinds. They are obstacles to ranging, obstacles to chaining, obstacles to both chaining and ranging.

23. A construction firm has estimated a net annual rent of ₹90,000 on a building, at the prevailing annual rate of interest of 9%. If the annual interest rate is revised to 5%, determine the increase in the capitalized value of the property.

Correct Answer: C. ₹ 8,00,000
Solution:

24. Among the following corrections applied for tape measurement, identify the correction which is NOT always negative in sign.

Correct Answer: B. Pull
Solution:Pull Correction (Cₚ): During measurement, the applied pull may be either more or less than the pull at which the chain or tape was standardised. Due to the elastic property of materials, the strain will vary according to the variation of applied pull, and hence necessary correction should be applied. This correction is given by the expression

The sign of correction will be positive or negative according as Pₘ is greater or less than Pₒ.

25. Among the following river training works, which are aligned either parallel or at an angle to the banks, identify the one having a difference in alignment when compared to others.

Correct Answer: C. Groynes
Solution:Groynes or spurs:
  • Structures constructed transverse to the river flow extending from the bank into the river.
  • Can be aligned either perpendicular to the bank or at an angle pointing d/s or u/s.
  • Also known as spur dike or transverse dikes and constitute the most widely used river training works.
  • Nose of the groyne is subjected to a tremendous action of water and has to be heavily protected by pitching.

26. As per IRC (Indian Roads Congress) recomm-endation, what will be the designed stopping sight distance (in metres) at the vehicle speed of 80 km/h on a rural highway?

Correct Answer: C. 120
Solution:Recommended value of stopping sight distance as per IRC
Design speed (km/h)Safe stopping distance (m)
5060 m
6080 m
6590 m
80120 m

27. The liquid limit and plastic limit of clay materials is 45% and 25% respectively, what is the activity of clay materials if 20% by weight of particles of size less than 2 microns?

Correct Answer: D. 1
Solution:No explanation given in the book

28. Which of the following CANNOT be considered as a hard surface lining of canal?

Correct Answer: D. Soil cement lining
Solution:Canal linings are classified into two major types based on the nature of surface and they are:

1. Earthen type lining
2. Hard surface lining

Earthen Type linings are again classified into two types and they are as follows:

  • Compacted Earth Lining
  • Soil Cement Lining

Soil Cement Lining: Soil-cement linings are constructed with mixtures of sandy soil, cement and water, which harden to a concrete-like material.

Hard Surface Canal Linings: It is sub divided into 4 types and they are:

  • Cement Concrete Lining
  • Brick Lining
  • Plastic Lining
  • Boulder Lining

29. Select the correct statement with respect to a slow sand filter.

Correct Answer: C. The effective size of sand particles shall be 0.15 to 0.3 mm, and their uniformity coefficient shall be preferably below 3.
Solution:Slow sand filter: They consist of fine sand, supported by gravel. They capture particles near the surface of the bed and are usually cleaned by scraping away the top layer of sand that contains the particles.

In SSF the effective size ranges between 0.2 to 0.4 mm and uniformity coefficient between 1.8 to 2.5 or 3.0. In RSF the effective size ranges between 0.35 to 0.55 and uniformity coefficient between 1.2 to 1.8.

30. Solve the question.

Correct Answer: D. 5/3
Solution: