CTEP-TECHNICAL QUIZ-1

1.Initial setting time of cement: 40 to 60min 30 to 60min 15 to 60min 35 to 60min

2. Role of GYPSM in cement is a) Control initial setting time b) Increase the strength c) Increase the durability d) Reduce crack

3. Maximum size of aggregate for general R.C.C works

A. 20mmB. 40mmC. 50mmD. 60mm

4. The test is used to detect presence of uncombined lime in cement

A. FinenessB. SoundnessC. Setting time D. Compressive strength

5. Soundness test is performed with the help of

A. Le-chatelier apparatus B. Autoclave testC. Vicat’s needleD. Normal consistency

6. Compressive strength at the end of 3days should not be less than

A. 11.5 N/sq.mmB. 12.5 N/sq.mmC. 17.5 N/sq.mmD. 18.5 N/sq.mm

7. Crushing strength of good concrete aggregate should be

A. MaximumB. MinimumC. AverageD. None of the above

8. Weight of a single cement bag isA. 30 kg B. 40 kgC. 50 kgD. 60 kg

9. The slump value of ordinary R.C.C works for beams and slabs is

A. 20 to 30mmB. 50 to 100mmC. 75 to 150mmD. 12 to 25mm

10. Factor affecting workability of concrete:A. Water in the mixB. Maximum size of particleC. Ratio of coarse and fine aggregate D. All the above

11. The size of coarse aggregate decreases, workability of concrete

A. Decrease B. IncreaseC. Doesn’t a matter D. None of the above

12. Height of the slump cone isA. 10cmB. 20cmC. 30cmD. 40cm

13. Specific gravity of cementA. 2.15B. 1C. 1.5D. 3.15

14. The curing period of an ordinary Portland cement is

A. 3 to 7 daysB. 7 to 14daysC. 14 to 21 daysD. None of the above

15. The entrained air in concrete A. Increase workabilityB. Decrease workabilityC. Increase strengthD. None of the above

16. Workability of concrete can be improved by

A. More sand B. More cementC. More fine aggregateD. Fineness of coarse aggregate

17. Workability of concrete can be improved by adding

A. IronB. SodiumC. Zinc D. Sulphur

18. After casting, an ordinary cement concrete on drying

A. ShrinksB. Expands C. Remains unchanged D. Can expand or shrink

19. Strength of concrete is directly proportional to

A. Cement water ratioB. Water cement ratioC. Sand cement ratio D. Water aggregate ratio

20. The poison ratio for concrete ranges between

A. 0.10 and 0.15B. 0.15 and 0.25C. 0.25 and 0.30D. 0.30 and 0.35

21. Slump test is a measure of A. Tensile strengthB. Compressive strengthC. Impact valueD. Consistency

22. Durability of concrete is affected byA. Cider B. VinegarC. Alcohol D. Both (a) and (b)

23. Light weight concrete is used in A. Heat resistance B. Air conditioning of buildingC. Non load bearing wallD. Reducing thickness

24. ISI specified full strength of concrete after

A. 7daysB. 15daysC. 21daysD. 28days

25. High temperature A. Increase the strength of concreteB. Decrease the strength of concreteC. No effect on the strength of concreteD. Low effect on the strength of concrete

26. Early strength of cement is caused by A. Tri calcium silicate B. Di calcium silicateC. Tri calcium aluminateD. Gypsum

27. Three main raw material used for Portland cement as

A. Lime stone, sandstone clayB. Lime, silica and clayC. Lime, clay and gypsumD. Silica, alumina, gypsum

28. When water is added to cement A. Heat is generated B. Heat is absorbedC. Chemical reaction is started D. Impurities are washed out

29. White cement is produced inA. Flyash kilnB. Coal kilnC. Oil fired kilnD. Electrical form kiln

30.If cement is very fine, thenA. More is the surface areaB. More is the separation of water at top of

concreteC. The reaction with water gets retardedD. Less shrinkage and cracking of concrete

31. Percentage void ration of cement isA. 50B. 40C. 30D. 20

32. Specific gravity of portland cement isA. 3.50B. 3.30C. 3.15D. 3.00

33. Vicat’s apparatus is used for A. Fineness testB. Consistency testC. Soundness testD. Final setting time

34. Gypsum containA. Carbon dioxide and calciumB. Water and calcium suphateC. Hydrogen sulphide and calciumD. Lime

35. Percentage of gypsum added in cement is

A. 0.25 B. 1C. 2D. 8

36. Bulking of aggregate is due to A. Moisture content B. Absorbed waterC. Voids D. Less compaction

37. Maximum bulking factor of sand is A. 1.00B. 1.10C. 1.2D. 1.4

38. Increase in fineness modulus of aggregate indicates

A. Finer gradingB. Irregular grading C. Gap grading D. None of these

39. Loss angeles machine is used to test aggregate for

A. Crushing strengthB. Abrasion resistanceC. Water absorptionD. None of these

40. Factor safety of concrete is based on itsA. Yield stressB. Ultimate stressC. Both (a) and (b)D. None of these

41. The portion of brick cut across its widthA. BatB. Half brickC. Both (a) and (b)D. None of these

42. pH value of water for quality concrete shall not be less than

A. 2 B. 4C. 6D. 12

43. Workability of cement concrete is more for

A. Big size aggregateB. Round shape aggregateC. Properly graded aggregateD. All of these

44. Bulk density of aggregate is expressed as

A. Kg/litre B. Kg/m3

C. T/ m3

D. None of these

45.Which of the following is not a mortar?A. Lime mortarB. Surki mortarC. Surki sand mortarD. Fire resistance mortar

46. Segregation means separation of A. Water from aggregates and cementB. Fine aggregate from coarse aggregateC. Cement paste from coarse aggregateD. All of these

47. Admixture in ordinary concrete is A. Expoxy resinB. Fly ashC. CaOD. Quartzite

48. Normal curing period of lime mortar isA. 3daysB. 7daysC. 10daysD. 14days

49. Compacting factor test of cement concrete determines its

A. StrengthB. PorosityC. Degree of compacting under loadsD. Workability

50. Sand in mortar is needed forA. Decreasing the quantity of cementB. Reducing shrinkageC. Increasing the strengthD. All of these

51. Curing of concrete at high temperature results in

A. Increase in ultimate strengthB. Cracking of concreteC. Decrease in ultimate strengthD. Early development of ultimate strength

52. A good aggregate should beA. Colored B. Hard and durableC. Strong and chemically inertD. All of these

53. Unit weight of cement in kg/ m3

A. 1600B. 2000C. 2400D. 2500

54. Percentage of gypsum added in cement is

A. 0.25B. 1C. 2D. 8

55. Gypsum is a A. Slow setting materialB. Quick setting material C. Setting agent D. Heat resisting material

56. If sea water is used for preparing concrete, it

A. Will cause efflorescenceB. May corrode the reinforcementC. Will cause dampnessD. All of these

57. Presence of entrained air in air results inA. Reduced bleeding B. Lower densityC. Decreased strength at all gasesD. All of these

58. Expansion joints are provided if length of the concrete exceeds

A. 20mB. 45mC. 60mD. 75m

59. Workability can be measured byA. K-slump testerB. Compaction factor testC. Vee-Bee testD. All of these

60. Size of fine aggregate should not exceed

A. 2.75mmB. 3.75mmC. 4.75mmD. 5.75mm