Building Materials Quiz

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101. Gypsum consists of

A) H2S and CO2
B) CASO4 and H2O
C) Lime and H2O
D) CO2 and calcium

... Answer : B)
Explanation : CASO4 and H2O

102. For testing compressive & tensile strength of cement, the cement mortar is made by mixing cement and standard sand in the proportions of

A) 1:2
B) 1:3
C) 1:4
D) 1:6

... Answer : B)
Explanation : 1:3

103. The slump recommended for mass concrete is about

A) 25 mm to 50 mm
B) 50 mm to 100 mm
C) 100 mm to 125 mm
D) 125 mm to 150 mm

... Answer : A)
Explanation : 25 mm to 50 mm

104. With increase in moisture content, the bulking of sand

A) Increases
B) Decreases
C) First increase to a certain maximum value and the decreases
D) First increase to a certain minimum value and the increases

... Answer : C)
Explanation : First increase to a certain maximum value and the decreases

105. Which of the following cements is suitable for use in massive concrete structures such as large dams?

A) Ordinary Portland cement
B) Low heat cement
C) Rapid hardening cement
D) Sulphate resisting cement

... Answer : B)
Explanation : Low heat cement

106. Proper amount of entrained air in concrete results in: 

                        i) Better workability

                       ii) Better resistance to freezing and thawing

                      iii) Lesser workability

                      iv) Less resistance to freezing and thawing

The correct answer is:

A) (i) and (ii)
B) (i) and (iv )
C) (ii) and (iii)
D) (iii) and (iv)

... Answer : A)
Explanation : (i) and (ii)

107. The most common admixture which is used to accelerate the initial set of concrete is

A) Gypsum
B) Calcium chloride
C) Calcium carbonate
D) None of the above

... Answer : B)
Explanation : Calcium chloride

108. The maximum quantity of calcium chloride used as an accelerator in cement in percentage by weight of cement is

A) 1
B) 2
C) 3
D) 4

... Answer : B)
Explanation : 2

109. The basic purpose of retarder in concrete is

A) To increase the initial setting time of cement paste in concrete
B) To decrease the initial setting time of cement paste in concrete
C) To render the concrete more water tight
D) To improve the workability of concrete mix

... Answer : A)
Explanation : To increase the initial setting time of cement paste in concrete

110. Which of the following cements contains maximum percentage of dicalcium silicate?

A) Ordinary Portland cement
B) Low heat cement
C) Rapid hardening cement
D) Sulphate resisting cement

... Answer : B)
Explanation : Low heat cement

111. The most commonly used retarder in cement is

A) Gypsum
B) Calcium chloride
C) Calcium carbonate
D) None of the above

... Answer : A)
Explanation : Gypsum

112. Three basic raw materials which are needed in large quantities for production of steel are

A) Iron ore, coal and sulphur
B) Iron ore, carbon and sulphur
C) Iron ore, coal and lime stone
D) Iron ore, carbon and lime stone

... Answer : C)
Explanation : Iron ore, coal and lime stone

113. Compared to mild steel cast iron has: 

(i) High compressive strength 
(ii) High tensile strength 
(iii) Low compressive strength 
(iv) Low tensile strength. 

The correct answer is:

A) (i) and (ii)
B) (ii) and (iii)
C) (iii) and (iv)
D) (i) and (iv)

... Answer : D)
Explanation : (i) and (iv)

114. Which of the following gradients exerts maximum influence on properties of steel?

A) Iron
B) Carbon
C) Manganese
D) Sulphur

... Answer : B)
Explanation : Carbon

115. Which of the following is the purest form of iron?

A) Cast iron
B) Wrought iron
C) Mild steel
D) High carbon steel

... Answer : B)
Explanation : Wrought iron

116. The ultimate tensile strength of structural mild steel is about:

A) 160N/mm2
B) 260N/mm2
C) 420N/mm2
D) 529 N/mm2

... Answer : C)
Explanation : 420N/mm2

117. Percentage of carbon content in mild steel is

A) Less than 0.25
B) Between 0.25 and 0.7
C) Between 0.7 and 1.5
D) Greater than 1.5

... Answer : A)
Explanation : Less than 0.25

118. Which of the following stresses is used for identifying the quality of structural steel?

A) Ultimate stress
B) Yield stress
C) Proof stress
D) None of the above

... Answer : B)
Explanation : Yield stress

119. The ratio of the thickness of web to that of flange of steel rolled structural beams and channel is:

A) Less than 1
B) Equal to 1
C) Greater than 1
D) Less than 1 in beams but greater than 1 in channels

... Answer : A)
Explanation : Less than 1

120. Paints with white lead base are suitable for painting of

A) Wood work
B) Iron work
C) Both wood work and iron work
D) None of the above

... Answer : A)
Explanation : Wood work

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