Building Materials and Construction

1 A heavy stone is suitable for-retaining walls.

2 The stone suitable for rubble masonry should be-hard.

3 A good building stone should not absorb water more than-5%.

4 Jumper is a tool used for-quarrying of stones.

5 Crushing strength of a good building stone. should be more than-100 Mpa.

6 Specific gravity for most of the building stones lies between-2.5 to 3.0.

7 Spalling hammer is used for- rough dressing of stones.

8 Cross cut saw is used for-cutting hard stones.

9 Sapwood consists of portion of timber between heartwood and cambium layer

10 First class timber has an average life of-more than 10 years.

11 A first class brick when immersed in cold water for 24 hours should not absorb

water more than-20%.

12 Crushing strength of a first class brick should not be less than-10.5 N/mm^2.

13 The percentage of alumina in a good brick earth lies between-20 to 30%.

14 The nominal size of the modular brick is-200 mm x 100 mm x 100 mm.

15 Percentage of silica in a good brick earth lies between-50 to 60%.

16 Excess of silica in brick earth results in-loss of cohesion.

17 The process of mixing clay, water and other ingredients to make brick is known

as-kneading.

18 Pug mill is used for-preparation of clay.

19 Which of the following bricks are used for lining of furnaces -refractory bricks.

20 The frog of the brick in a brick masonry is generally kept on-top face.

21 Number of bricks required for one cubic metre of brick masonry is-500.

22 Glazing is used to make earthenware-impervious.

23 Quick lime is- calcium oxide.

24 Hydraulic lime is obtained by-burning of kankar.

25 The main ingredients of Portland cement are-lime and silica.

26 Le Chatelier's device is used for determining the-soundness of cement.

27 The main constituent of cement which is responsible for initial setting of cement is-tricalcium aluminate.

28 The initial setting time for ordinary Portland cement as per IS specifications

should not be less than-30 minutes.

29 As per IS specifications, the maximum final setting time for ordinary Portland

cement should be-10 hours.

30 For testing compressive strength of cement, the size of cube used is-50 mm.

31 The normal consistency of ordinary Portland cement is about-30%.

32 After storage, the strength of cement-decreases.

33 According to IS specifications, the compressive strength of ordinary portland

cement after three days should not be less than-16 Mpa.

34 Addition of pozzolana to ordinary Portland cement increases-shrinkage.

35 Gypsum consists of-CaS04 and H20.

36 The slump recommended for mass concrete is about-25 mm to 50 mm.

37 Which of the following cements is suitable for use in massive concrete structures such as large dams-low heat cement.

38 The most common admixture which is used to accelerate the initial set of concrete is-calcium chloride.

39 The basic purpose of a retarder in concrete is-to increase the initial setting time of cement paste in concrete.

40 The most commonly used retarder in cement is-gypsum.

41 Which of the following gradients exerts maximum influence on properties of steel-carbon.

42 Which of the following is the purest form of iron-wrought iron.

43 The ultimate tensile strength of structural mild steel is about-420 N/mm²

44 Percentage of carbon content in mild steel is-less than 0.25.

45 Which of the following stresses is used for identifying the quality of structural steel -yield stress.

46 The amount of water used for one kg of distemper is-0.6 litre.

47 Expansion Joints in masonry walls are provided in wall lengths greater than 40 m.

48 The type of bond provided in brick masonry.for carrying heavy loads is-English bond.

49 A mortar joint in masonry which is normal to the face of wall is known as-cross joint.

50 The slendemess ratio for masonry walls should not be more than-20.

51 The proportions of lime and sand in the mortar normally used in brick construction-1:2.

52 The differential settlement in case of foundations on sandv soils should not

exceed-25mm.

53 In case of foundations on black cotton soils, the most suitable method to increase the bearing capacity of soils is to-replace the poor soil.

54 The type of footing which is used to transmit heavy loads through steel columns is-grillage foundation.

55 The maximum total settlement for isolated foundations on clayey soils should be limited to-65mm.

56 The bearing capacity of a water logged soil can be improved by-draining the soil.

57 The maximum number of steps in a flight should generally be restricted to-12.

58 The number of steps in a flight generally should not be less than-3.

59 Sum of tread and rise must lie between 400 to 450.

60 Half turn stairs are the stairs which change their direction through-180.

61 Doglegged stairs are-half turn stairs .

62 Which of the following mortar is most suitable for construction work in waterlogged areas -cement mortar.

63 After addition of cement, the gauged mortar should be used within-1-2 hour.

64 What is efflorescence-Formation of white patches on the brick surface due to insoluble salts in the brick clay.

65 Vanadium steel is normally used in the manufacture of-axles and springs.

66 Neoprene is suitable for use in-bearings of bridges.

67 Seasoning of timber results in-increased strength,increased durability

68 Timber can be made more fire resistant by-Sir Abel's process.

69 Distemper is used to coat-interior surfaces not exposed to weather.

70 Putty is made up of-powered chalk and raw linseed oil.

71 The compacting factor test of cement concrete determines its-workability.

72 For good bonding in brick masonry-the vertical joints in alternate courses

should fall in plumb.

73 A good brick, when immersed in water bath for 24 hours, should not absorb more than-20% of its dry weight.

74 For complete hydration of cement the w/c ratio needed is-more than 0.35 but less than 0.45.

75 The ratio of Young's modulus of high tensile steel to that of mild steel is about-1.0.

76 King closers are related to-brick masonry.

77 The temperature range in a cement kiln is-1300 to l500°C.

78 Before testing setting time of cement one should test for-consistency.

79 Surkhi is added to lime mortar to-impart hydraulicity.

80 Increase in fineness of cement-increases the rate of strength development and leads to higher shrinkage.

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