SSC-JUNIOR ENGINEER (Civil & Structural) Online Exam 2017 (Part-IV)

Total Questions: 50

11. Separation of coarse aggregates from mortar during transportation is known

Correct Answer: C. segregation
Solution:No explanation given in the book

12. Pick up the correct statement from the following:

Correct Answer: D. All options are correct
Solution:No explanation given in the book

13. Water cement ratio is

Correct Answer: C. Both 'volume of water to that of cement' and 'weight of water to that of cement'.
Solution:No explanation given in the book

14. Higher workability of a concrete is required if the structure is

Correct Answer: D. thick and heavily reinforced
Solution:No explanation given in the book

15. Workability of concrete mix with low water cement ratio is determined by

Correct Answer: C. compaction factor test
Solution:No explanation given in the book

16. For preparing a test specimen it is necessary

Correct Answer: D. All options are correct
Solution:The following are required to prepare a test specimen
  • For mixing fine mixture and cement done by dry hand.
  • For mixing of coarse aggregate.
  • For mixing of fine aggregate, coarse aggregate, cement and water.

17. The maximum thickness of concrete floor of a cement warehouse is

Correct Answer: D. 25 cm
Solution:The maximum thickness of concrete floor of a cement warehouse should be 25 cm, one method of repair is to grind or scarify the surface and apply a well bonded topping to bring the floor to the required thickness, otherwise it should be torn out and replaced.

18. The compaction of concrete improves

Correct Answer: D. All options are correct
Solution:Compaction of concrete is the application of removing entrapped air from voids in freshly concrete to reach the design the strength, density and low permeability. The main purpose of compaction is to get a dense mass without voids. Compaction improves the fluidity of concrete for compaction we use vibrator who help the settle down denses to concrete.

19. Horizontal construction joints in concrete walls are generally provided at

Correct Answer: D. All options are correct
Solution:Construction joint for concrete's wall given as per window sill level, soffit level and floor level. Joints are placed to prevent the cracks.

The main concern in joint placement is to provide the adequate shear transfer and flexural continuity to the joint. In the column where the footed and slab are joined. A construction joint are given 10 to 15 cm towards in horizontal direction from it.

20. Workability of concrete for a given water content is good if the aggregates are

Correct Answer: A. rounded aggregate
Solution:Workability is depends on the aggregate size. Aggregate size is main impact of low and high workability.

Smaller aggregate are less workable as compared to larger size of aggregates. Elongated, angular or flaky particles are difficult to mix and place and have greater surface to cover, decreasing the workability of concrete. But in case of rounded particles have less surface are to cover which increase the workability of concrete.