Quiznetik

Building Materials | Set 8

1. The compressive strength of a good Portland cement and standard sand mortar after 3 days of curing should not be less than

Correct : B. 11.5 MN/m2

2. The compressive strength of second elass bricks should bot be less than

Correct : A. 7.5 MN/m2

3. The shrinkage of ordinary concrete is about

Correct : B. 0.3 to 0.6 mm/m

4. A limestone containing about 30% of alumina and silica is called

Correct : D. kankar

5. The frog of a brick is normally made on its

Correct : D. top face

6. The normal consistency of Portland cement is about

Correct : D. 25%

7. The lime which consists almost entirely of calcium oxide, is called

Correct : B. rich lime

8. The commonly used lime for works under water or in damp situations is

Correct : D. eminently hydraulic lime

9. The natural drying of bricks is also called hack drying.

Correct : A. True

10. The dry process of mixing is usually employed in the manufacture of Portland cement when the raw material is

Correct : A. blast furnace slag

11. A good refractory brick should withstand high temperature. It should also have low coefficient of expansion and contraction.

Correct : A. Yes

12. The time required for air seasoning of soft wood is

Correct : C. 60 to 90 days

13. The silicious sandstone which has been subjected to metamorphic action, is called

Correct : C. quartzite

14. The lime which contains more than 30% of clayey impurities in the form of silica, alumina and iron oxide, is known as

Correct : A. poor lime

15. Siliceous rocks have alumina or clay as their major constituent.

Correct : A. Yes

16. A good building stone is one which does not absorb more than

Correct : A. 5%

17. According to Indian standard specifications, the temperature for curing is

Correct : C. 27?C

18. The hydraulic lime which resembles very much with Portland cement in its chemical composition is called.

Correct : C. eminently hydraulic lime

19. The initial setting of cement is caused due to

Correct : C. tri-calcium aluminate

20. Which of the following constituent, when present in excess quantity in clay causes the bricks to melt and distort during burning?

Correct : C. Lime

21. The drier in an oil paint should not be more than

Correct : B. 10%

22. The addition of pozzolana to Portland cement causes

Correct : D. all of these

23. The commonly used lime in white washing is

Correct : B. fat lime

24. The greater the percentage of tri-calcium silicate in the cement, the better will be the cement.

Correct : A. Correct

25. The cementing property in cement is mainly due to

Correct : A. lime

26. The vehicle used in bronze paints is usually

Correct : D. nitro-cellulose lacquer

27. The base in a paint is added to

Correct : C. hide the surface to be painted

28. The commonly used extender in a paint is

Correct : D. any one of these

29. Argillaceous rocks have their main constituent as

Correct : B. clay or alumina

30. The commonly base used in a paint is

Correct : D. any one of these

31. The compressive strength of paving bricks should not be less than

Correct : C. 40 MN/m2

32. Quick lime on reaction with water gives

Correct : B. slaked lime

33. The compressive strength of granite is

Correct : B. 70 to 130 MN/m2

34. The timber whose thickness is less than 5 cm and the width exceeds 12 cm, is called a

Correct : A. board

35. A limestone found in seams of great thickness in non-crystalline texture with earthy appearance, is called

Correct : B. compact limestone

36. The process of mixing clay, water and other ingredients to make bricks, is known as

Correct : C. kneading

37. The compound responsible for the initial setting of cement, is

Correct : C. both (a) and (b)

38. Eminently hydraulic lime is one in which the percentage of silica, alumina and iron oxide is

Correct : C. 25 to 30%

39. The time required for seasoning of timber in kilm seasoning is

Correct : C. 10 to 20 days

40. The thin radial fibres extending from the pith to the cambium layer is called medullary rays.

Correct : A. Yes

41. The percentage of alumina in a good brick clay should vary from

Correct : A. 20 to 30%

42. Laterite is chemically classified as

Correct : B. argillaceous rock

43. The alkaline salt present in the bricks, absorbs moisture from the air which on drying

Correct : B. leaves high powder deposit on the brick

44. The shrinkage of concrete

Correct : B. increases

45. The compressive strength of felspar is

Correct : B. less than

46. The hand made bricks are

Correct : A. superior

47. The bricks after burning in kilns require about

Correct : D. 12

48. The average out-turn of first class bricks in clamp burning is about

Correct : B. 60%

49. The advantage of adding pozzolana (or surkhi) to lime is to

Correct : D. all of these

50. An assembled product made up of veneers and adhesives is called

Correct : C. plywood

51. The shrinkage of concrete

Correct : C. increases with increase in the percentage of concrete

52. The liquid part of the paint is called

Correct : B. vehicle

53. The base material for distemper is

Correct : A. chalk

54. Marble is an example of

Correct : B. metamorphic rock

55. The compressive strength of sandstone is

Correct : C. 65 MN/m2

56. The main constituent of a Portland cement is

Correct : A. lime

57. Hydraulic lime generates

Correct : B. less

58. Linseed oil is rapidly soluble in

Correct : D. all of these

59. Which of the following statements is wrong?

Correct : A. A stone with large percentage of quartz is very soft.

60. The amount of gypsum, usually, added in the manufacture of cement is

Correct : C. 1 to 3%

61. The length of a curved tile varies from

Correct : C. 15 to 20 cm

62. The dressing of stone is done

Correct : A. immediately after quarrying

63. The rapid hardening Portland cement has a

Correct : B. higher heat of hydration

64. The percentage of the residue left after sieving good Portland cement in 90 micron sieve should not exceed

Correct : B. 10%

65. Marble contains mostly lime and silica.

Correct : A. True

66. The attrition test on stones is performed

Correct : D. for determining the rate of wear of stone due to grinding action under traffic

67. Linseed oil in paint is used as a

Correct : C. carrier

68. The lime mortar is made from

Correct : D. hydraulic lime

69. Which of the following is an example of agrillaceous rock?

Correct : D. all of these

70. Which of the following paint is highly resistant to fire?

Correct : B. Asbestos paint

71. Seasoning of tunber

Correct : B. improves strength properties of timber

72. Gypsum is added in the manufacture of Portland cement in order to

Correct : B. lengthen the setting time of cement

73. Lacquer paints are more durable than enamel paints.

Correct : A. Yes

74. The thickness of five-ply sheet varies from

Correct : B. 6 to 9 mm

75. Which of the following statement is wrong?

Correct : D. none of the above

76. The expansion in Portland cement can be tested by

Correct : B. soundness test

77. The hapd hardening Portland cement is obtained by

Correct : A. grinding the clinker to a high degree of fineness

78. Limestone is physically classified as

Correct : A. stratified

79. The solvent used in cement paints is

Correct : C. water

80. Vicat's apparatus is used to determine the

Correct : D. all of these

81. The bricks after moulding should be dried in

Correct : C. air for 3 to 8 days but not in sun

82. The strength of cement concrete increases with

Correct : D. all of the above

83. The compressive strength of ordinary cement is less than its tensile strength.

Correct : B. Wrong

84. The percentage of the slag component of Portland-slag cement varies from

Correct : B. 40 to 70%

85. The commonly used solvent in oil paints is

Correct : C. either (a) or (b)

86. The rocks formed due to solidification of molten mass laying below or above the earth surface, are called

Correct : D. igneous rocks

87. The density of concrete

Correct : B. increases

88. The type of briek suitable for panal walls for multi-storeyed buildings is

Correct : C. either (a) or (b)

89. Sprit varnish consists of

Correct : B. spirit and shellac

90. The defect caused due to over-maturity and unventilated storage of the wood during its transit, is called

Correct : C. foxiness

91. The initial setting time of rapid hardening cement should not be less than

Correct : A. 30 min

92. Snocem is an oil paint.

Correct : B. False

93. Sandstone consists of

Correct : C. quartz, lime and silica

94. A first class brick should have a minimum crushing strength of

Correct : B. 10.5 MN/m2

95. The specific surface (in cm2/g) of a good Portland cement should not be less than

Correct : C. 2250

96. The calcareour rocks have

Correct : A. lime or calcium carbonate

97. The expansion of Portland cement is caused by

Correct : D. both (a) and (c)