Practice Test: Question Set - 23
1. The maximum thickness of concrete floor of a cement warehouse, is
- (A) 10 cm
- (B) 15 cm
- (C) 20 cm
- (D) 25 cm
2. Too wet concrete may cause
- (A) Weakness
of concrete
- (B) Excessive
laitance
- (C) Segregation
- (D) All the
above
3. Maximum percentage reinforcement in case of slabs is limited to
- (A) 2
- (B) 4
- (C) 6
- (D) 8
4. The commonly used material in the manufacture of cement is
- (A) Sand stone
- (B) Slate
- (C) Lime stone
- (D) Graphite
5. According to I.S. : 456, the number of grades of concrete mixes, is
- (A) 3
- (B) 4
- (C) 5
- (D) 7
6. Grading of sand causes great variation in
- (A) Workability
of concrete
- (B) Strength
of concrete
- (C) Durability
of concrete
- (D) All the
above
7. The percentage of the aggregate of F.M. 2.6 to be combined with coarse aggregate of F.M. 6.8 for obtaining the aggregates of F.M. 5.4, is
- (A) 30 %
- (B) 40 %
- (C) 50 %
- (D) 60 %
8. The ratio of various ingredients (cement, sand, aggregates) in concrete of grade M 200, is
- (A) 1 : 2 : 4
- (B) 1 : 3 : 6
- (C) 1 : 1½
: 3
- (D) 1 : 1 : 2
9. Joints in concrete structures, are provided
- (A) To reduce
the tensile stresses likely to be developed due to evaporation of water
- (B) To
minimize the change in the dimensions of the slab
- (C) To
minimize the necessary cracking
- (D) All the
above
10. For the construction of R.C.C. slabs, columns, beams, walls, etc. the grade of concrete mix used, is
- (A) 1 : 3 : 6
- (B) 1 : 1½
: 3
- (C) 1 : 2 : 4
- (D) 1 : 1 : 2
11. Pick up the correct statement from the following:
- (A) Water
enables chemical reaction to take place with cement
- (B) Water
lubricates the mixture of gravel, sand and cement
- (C) Strength
of concrete structure largely depends upon its workability
- (D) All the
above
12. The final operation of finishing floors, is known as
- (A) Screeding
- (B) Floating
- (C) Trowelling
- (D) Finishing
13. Transport of concrete by pumps, is done for a distance of
- (A) 100 m
- (B) 200 m
- (C) 300 m
- (D) 400 m
14. Curing
- (A) Reduces
the shrinkage of concrete
- (B) Preserves
the properties of concrete
- (C) Prevents
the loss of water by evaporation
- (D) All of the
above
15. The datum temperature for maturity by Plowman, is
- (A) 23°C
- (B) 0°
- (C) - 5.6°C
- (D) - 11.7°C
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