SSC-Junior Engineer (Civil & Structural) Online Exam 2018 (Part-IV)

Total Questions: 50

11. A load value obtained by multiplying the characteristic load with load factor is known as:

Correct Answer: A. Designed load
Solution:

12. For inspection of welded joint, the method in which iron fillings are spread over the weld and it is then subjected to an electric current is known as:

Correct Answer: C. Magnetic particle method
Solution:Magnetic Particle Method: Iron fillings are spread over the weld and it is then subjected to an electric current. The fillings form pattern which are interpreted to locate surface cracks.

Dye Penetration Method: The depth of a crack can be estimated by this method. A dye is applied over the weld surface and then the surplus is removed.

Ultrasonic Method: Ultrasonic sound waves are sent through the weld. Defects like flaws, blow holes etc. affect the time interval of sound transmission identifying the defect.

Radiography: X-rays or gamma rays are used to locate defects. This method is used in butt weld only.

13. The degree of curve for a 30 m chain is:

Correct Answer: A. 1718.9/R
Solution:

14. For under-water construction _________ cement is used.

Correct Answer: A. quick setting
Solution:Quick setting cement: Quick setting cement is produced by reducing the gypsum or calcium sulphate content and addition of small amount of aluminium sulphate in Portland cement; these modification along with finer grinding of cement results in quick setting properties.

The setting of cement starts within five minutes of addition of water and setting process is complete in 30 minutes, i.e., cement becomes hard. All the operations of mixing, placing and finishing should be completed within this period. Quick setting cement may be used for concreting under water or for concreting in running water.

15. The least count of a prismatic compass is:

Correct Answer: B. 30 seconds
Solution:The Least Count (L.C.) of Prismatic Compass is 30'. It means compass can read only those observations which are multiples of 30 minutes. And The L.C. of Surveyor Compass is 15'.

16. For most economical section using Chezy's formula, depth of flow for maximum discharge through circular channel of diameter D is:

Correct Answer: B. 0.95 D
Solution:Most economical circular channel gives maximum discharge while flow depth D = 0.95 diameter.

17. Street inlets for draining rain water are located along the road side on straight roads at an interval of __________.

Correct Answer: C. 30 to 60 m
Solution:Street inlets for draining rain water are located along the road side on street road at an interval of 30 m to 60 m.

18. Sarda type fall was designed to:

Correct Answer: A. minimise the depth of cutting
Solution:Sarda Type Fall: This type of falls are constructed on Sarda canal in Uttar Pradesh. It is a fall with raised crest and with vertical impact.

The soils in Sarda command comprised sandy stratum overlain by sandy-clay on which depth of cutting was to be kept minimum. This made it obligatory to provide number of falls with small drops.

In Sarda type falls (q) discharge intensity varied from 1.6 to 3.5 cumec/m and drop varied from 0.6 to 2.5 m.

19. The slope of a bending moment diagram gives _________.

Correct Answer: A. shear force
Solution:The slope of the bending moment curve at any point is equal to the magnitude of the shearing force at that point.

General shapes for moment curves relating to corresponding shearing force curves.

20. The process of taking out stones from natural rock is known as:

Correct Answer: D. quarrying
Solution:The process of extracting or taking out stones from natural rock beds is known as quarrying of stones. The term 'quarry' is used to indicate the exposed surface of a natural rock. The place or site from where stones are taken out is called quarry site.

It is to be noted that in the case of a 'quarry' the operations are carried out almost at the ground level, in an exposed condition. In contrast to this, a mine is the one in which the operations are carried out at a great depth below the ground surface.