Building Materials Quiz

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61. After addition of cement, the gauged mortar should be used within -

A) 30 times
B) 1-2 hours
C) 8-10 hours
D) 24 hours

... Answer : B) 1-2 hours
Explanation : After addition of cement, the gauged mortar should be used within 1-2 hours.

62. Which of the following test is used to determine the rate of wear of stones? -

A) Crushing test
B) Abrasion test
C) Attrition test
D) Impact test

... Answer : C) Attrition test
Explanation : Attrition test is used to determine the rate of wear of stones.

63. What is efflorescence?

A) Formatting of white patches on the brick surface due to insoluble salts in the brick clay
B) Swelling of brick due to presence of carbonaceous matter and gas
C) Deformation of brick due to exposure to rain
D) Impurities in the brick clay which show after burning.

... Answer : A)
Explanation : Formatting of white patches on the brick surface due to insoluble salts in the brick clay

64. For a given environment, the most significant factor that influences the total shrinkage of concrete is -

A) Cement content of mix
B) Total amount of water added at the time of mixing
C) Size of the member concreted
D) Maximum size of the coarse aggregate used

... Answer : B)
Explanation : Total amount of water added at the time of mixing

65. As a construction material, plywood is preferred to thin planks of timber because of -

A) Good strength and dimensional stability in both lateral and longitudinal directions
B) Good dimensional stability in both longitudinal and lateral directions
C) Good strength in both longitudinal and lateral directions.
D) Savings in cost and environmental considerations

... Answer : A)
Explanation : Good strength and dimensional stability in both lateral and longitudinal directions

66. The aggregate crushing value of coarse aggregates which is used for making concrete, which in turn is used for purposes other than wearing surfaces, should not exceed-

A) 30%
B) 40%
C) 45%
D) 50%

... Answer : C) 45%
Explanation : The aggregate crushing value of coarse aggregates which is used for making concrete, which in turn is used for purposes other than wearing surfaces, should not exceed 45%.

67. Vanadium steel is normally used in the manufacture of -

A) Axles and springs
B) Ball bearing
C) Magnets
D) Railway switches and crossings

... Answer : A)
Explanation : Axles and springs

68. Neoprene is suitable for use in -

A) Bearings of bridges
B) Hard duty rubber coatings of floors
C) Joinery works
D) Floors of dance halls

... Answer : B)
Explanation : Hard duty rubber coatings of floors

69. Which of the following pairs is correctly matched?

A) Sandstone …. Igneous rock
B) Limestone ….. sedimentary rock
C) Basalt …… metamorphic rock
D) Granite …..argillaceous rock

... Answer : B)
Explanation : Limestone ….. sedimentary rock

70. To produce low heat cements, necessary to reduce the compound-

A) C3S
B) C2S
C) C3A
D) C4AF

... Answer : C)
Explanation : C3A

71. Timber can be made more fire resistant by -

A) Dipping and steeping process
B) Sir abel’s process
C) Charring
D) Hot and cold open tank treatment

... Answer : B)
Explanation : Sir abel’s process

72. The wood preservative "Creosote" is derived from-

A) Wood or coal
B) Acidic cupric chromate
C) Chromate zinc chloride
D) Pentachlorophenol

... Answer : A)
Explanation : Wood or coal

73. Distemper is used to coat -

A) External concrete surface
B) Internal surfaces not exposed to weather
C) Wood work
D) Compound walls

... Answer : B) Internal surfaces not exposed to weather
Explanation : Distemper is used to coat Internal surfaces not exposed to weather.

74. Putty is made up -

A) White lead and turpentine
B) Powered chalk and raw linseed oil
C) Red lead and linseed oil
D) Zinc oxide and boiled linseed oil

... Answer : B) Powered chalk and raw linseed oil
Explanation :

75. The process of mixing clay water & other ingredients to make brick is known

A) Kneading
B) Moulding
C) Plugging
D) Drying

... Answer : A) Kneading
Explanation :

76. Advantage of a clamp compared to a kiln for burning brick is that

A) It takes less time of burning
B) It gives more output of first-class bricks.
C) It has less initial cost
D) It is suitable when bricks are required in large numbers

... Answer : C) It has less initial cost
Explanation :

77. The internal size of mould used in brick preparation is

A) Equal to the size of fully burnt brick.
B) Smaller than the size of fully burnt brick
C) Greater than the size of a fully burnt brick
D) None of the above

... Answer : C) Greater than the size of a fully burnt brick
Explanation :

78. Pug mill is used for

A) Preparation of clay
B) Moulding of clay
C) Drying of bricks
D) Burning of brick

... Answer : A) Preparation of clay
Explanation :

79. Which of the following bricks are used for lining of furnaces?

A) Over burnt bricks
B) Under burnt bricks
C) Refractory bricks
D) First class brick

... Answer : C) Refractory bricks
Explanation :

80. The frog of the brick in a brick masonry is generally kept on

A) Bottom face
B) Top face
C) Shorter side
D) Longer side

... Answer : B) Top face
Explanation :

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