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RRB Objective Type Questions-Civil Engineering
1. Concrete is strong in
(a) Compression (Ans)
(b) Tension
(c) Buckling
2. On tension stone concrete has
(a) More strength
(b) Zero strength (Ans)
(c) Medium strength
3. In concrete cement is added
(a) To take heavy loads
(b) To increase the volume of concrete
(c) To act as a binding material (Ans)
4. In an ordinary portland cement, the composition of lime is
(a) 50%
(b) 63% (Ans)
(c) 21%
5. For ordinary portland cement the fineness should not be less than
(a) 50,000 mm2/g
(b) 20,000 mm2/g
(c) 225,000 mm2/g (Ans)
6. In cement-fineness test the percentage of residue should not exceed
(a) 20% of good cement
(b) 10 of good cement (Ans)
(c) 25.5 of good cement
7. Soundness of cement is defined by
(a) the amount of expansion of the cement paste (Ans)
(b) the amount of contraction of the cement paste
(c) the sound produced while placing the concrete
8. The apparatus used to find normal consistency of cement is
(a) Le-Chatlier apparatus
(b) Vicat plunger apparatus (Ans)
(c) Rankines apparatus
9. Lower the normal consistency value,
(a) Lower will be the strength of concrete
(b) Medium will be the strength of concrete
(c) Higher will be the strength of concrete (Ans)
10. The size of vicat needle, used to conduct setting of cement is
(a) 10mm dia
(b) 1mm Square (Ans)
(c) 3mm Square
11. Fine aggregates are the aggregates having the size less than:
(a) 5mm
(b) 4.75mm (Ans)
(c) 3.50mm
12. In concrete the material used as a fine aggregate is
(a) cement
(b) sand (Ans)
(c) jelly
13. In concrete the fine aggregates is used to
(a) Fill up the voids in cement
(b) Fill up the voids in coarse aggregate (Ans)
(c) Fill up the voids in sand
14. In concrete, coarse aggregate is mainly used for
(a) providing bulk to the concrete (Ans)
(b) increasing the volume of concrete
(c) eliminating bulk to the concrete
15. For R.C.C. 1:2:4, the size of broken stone used is
(a) 25mm
(b) 20mm (Ans)
(c) Less than 20mm
16. For plain C.C. 1:4:8, the size of broken stone used is
(a) 40mm (Ans)
(b) below 40mm
(c) 20mm
17. In concrete, steel is used to
(a) Take up the buckling strength
(b) Take up the compression strength
(c) Take up the Tensile strength (Ans)
18. Mild steel having a carbon content of
(a) Low carbon steel (Ans)
(b) Medium carbon steel
(c) High carbon steel
19. Mild steel having a carbon content of
(a) 25%
(b) 0.25% (Ans)
(c) 0.5%
20. The carbon content in the steel should not exceed
(a) 0.5%
(b) 0.8%
(c) 0.3% (Ans)
21. High carbon steel is a steel having a carbon content of
(a) More than 0.50% (Ans)
(b) More than 50%
(c) Less than 0.50%
22. In concrete grade M15 - "M" indicates
(a) Mortar
(b) Mix (Ans)
(c) Mild steel
23. In concrete grade M15 - "15" indicates
(a) Characteristic strength of 75mm size concrete cube after 7 days curing in N/mm2
(b) Characteristic strength of 10mm size concrete cube after 22 days curing in N/mm2
(c) Characteristic strength of 150mm size concrete cube after 28 days curing in N/mm2 (Ans)
24. Workability of concrete is termed as
(a) the ease of work with which the concrete can be mixed, placed in position and compacted (Ans)
(b) the life of concrete after placing
(c) the maximum load taken by the concrete
25. Good workability is obtained by
(a) Adding more cement
(b) Adding more water (Ans)
(c) Adding less water
26. But, which reduces
(a) Weakness of concrete
(b) Life of concrete
(c) Strength of concrete (Ans)
27. When compared to machine mixing, hand mixing is not preferable because hand mixing requires
(a) More cement (Ans)
(b) More skill
(c) More Labours
28. Modular ratio is the ratio between the Young's modulus of:
(a) sand and steel
(b) steel and concrete (Ans)
(c) steel and cement
29. Modular ratio is obtained by using the formula
(a) m = 250/3 scbc
(b) m = 280/5 scbc
(c) m = 280/3 scbc (Ans)
30. For M15 Grade concrete, the value of modular ratio 'm is
(a) 13.3
(b) 18.7 (Ans)
(c) 17.5
31. For M20 Grade concrete, the value of modular ratio 'm' is
(a) 13.3 (Ans)
(b) 18.7
(c) 17.5
32. Shrinkage of concrete develops
(a) spalling in concrete
(b) bends in concrete
(c) cracks in concrete (Ans)
33. The total methods, used to design R.C.C. members are
(a) Three methods (Ans)
(b) Five methods
(c) Two methods
34. The conventional method and mostly adopted in R.C.C. Structures Design is
(a) Working stress method (Ans)
(b) Limit state method
(c) Method based on experimental investigation
35. On working stress method, adopted factor of safety for concrete is
(a) 0.5 to 1
(b) 3 to 4 (Ans)
(c) 1.8 to 2
36. In working stress method, adopted factor of safety for steel is
(a) 0.5 to 1
(b) 3 to 4
(c) 1.8 to 2 (Ans)
37. scbc indicates
(a) permissible stress in concrete in bending compression (Ans)
(b) permissible stress in steel in bending compression
(c) None of the above
38. Curing of concrete is done, to
(a) keep the moisture content inside the concrete as it is (Ans)
(b) remove the moisture content inside the concrete
(c) increase the workability of concrete
39. Any concrete attains 100% strength only after
(a) 28 days curing
(b) 24 days curing
(c) One year (Ans)
40. The test conducted for identifying the mix of concrete is
(a) slump test
(b) cube test (Ans)
(c) compacting factor test
41. In concrete cube test, the standard size of cube is
(a) 15 cm x 15 cm x 15 cm (Ans)
(b) 10 cm x 10 cm x 10 cm
(c) 25 cm x 25 cm x 25 cm
42. W.C. ratio is the ratio between
(a) water and concrete
(b) water and cement (Ans)
(c) workability and concrete
43. The wet density of concrete mix is
(a) 24,000 kg/m3
(b) 25,000 kg/m3
(c) 2,400 kg/m3 (Ans)
44. For 1:2:4 mix concrete the amount of cement added is
(a) 310 kg/m3
(b) 663 kg/m3
(c) 290 kg/m3 (Ans)
45. When the characteristic strength is specified the K factor is
(a) 1.00
(b) 1.64 (Ans)
(c) 2.00
46. Which of the following slumps would be most commonly applicable for pumped concrete?
(a) 50mm
(b) 100mm
(c) 75mm (Ans)
47. A throw compaction of concrete is obtained only by using
(a) Mixers
(b) Vibrators (Ans)
(c) Compacting Rods
48. Pre-cast concretes are compacted well by using
(a) Surface vibrators
(b) Needle vibrators
(c) Vibrating Tables (Ans)
49. For Beams, the compaction of concrete is done by
(a) Needle vibrators
(b) Surface vibrators (Ans)
(c) Vibrating Tables
50. Dry lean concrete bases to roads etc-can be compacted by
(a) vibrating rollers (Ans)
(b) immersion vibrators
(c) beam vibrators
