Building Materials MCQ

41. The stretcher bond in brick masonry can be used only when the thickness of the wall is

A. 90mm

B. 180mm

C. 190mm

D. 280 mm

A. 90mm

42. plywood

A. Has good strength along the panel only

B. Can be spilled in the plane of the panel

C. Has greater impact resistance to blows than ordinary wood

D. Cannot be bent more easily than ordinary wood of the same thickness

C. Has greater impact resistance to blows than ordinary wood

43.Pick up the correct statement from the following

A. The phenol is carbolicacid

B. The phenol is either extracted from coal-tar or prepared from benzene

C. Phenol reacts with formaldehyde, to form phenol formaldehyde resin

D. All the above

D. All the above

44. Pick up the correct statement from the following

A. Solder material is an alloy which melts at a temperature above400°C

B. Brazing is done at temperature above 600°C to1100°C

C. Brazing joint is stronger than the solderjoint

D. All the above

D. All the above

45. Assertion A : Pure lime takes a long time to develop adequate strength. Reason R : Pure lime has slow hardening characteristics. Select your answer according to the coding system given below

A. Both A and R is true and R is correct explanation of A

B. Both A and R is true and R is not a correct explanation ofA

C. A is true but R isfalse

D. A is false but R is true

A. Both A and R is true and R is correct explanation of A

46. During pudding

A. Molten metal is kept clear of the fuel

B. Carbon is converted into carbonic acid gas

C. Silicon forms a slag

D. All the above Answer

D. All the above Answer

47. Early attainment of strength in rapid hardening cement is mainly due to

A. Gypsum

B. Fine grinding

C. Tri-calcium silicate

D. Tri-calcium aluminate

B. Fine grinding

48. Which of the following cement contains the maximum percentage of dicalcium silicate?

A. Ordinary Portland cement

B. Low heat cement

C. Rapid hardeningcement

D. Sulfate resisting

B. Low heat cement

49. If ‘P’ is the percentage of water required for normal consistency, water to be added for determination of the initial setting time, is

A. 0.70P

B. 0.75P

C. 0.80P

D. 0.85P

50. The basic purpose of a retarder in concrete is

A. To increase the initial setting time of cement paste in concrete

B. To improve the workability of concrete mix

C. To decrease the initial setting time of cement paste inconcrete

D. To render the concrete more water tight

A. To increase the initial setting time of cement paste in concrete

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