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91. The basic purpose of a 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 watertight
D. to improve the workability of concrete mix

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

A. cast iron
B. wrought iron
C. mild steel
D. high carbon steel

93. Assertion A: Normally turpentine oil is recommended as thinner for indoor painting. Reason R: Turpentine oil is costlier than other thinners. Select your answer according to the coding system given below?

A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not the correct explanation of A
C. A is true but R is false
D. A is false but R is true

94. The amount of water used for one kg of distemper is_____________?

A. 0.2 liter
B. 0.4 liter
C. 0.6 liter
D. 0.8 liter

95. The most commonly used retarder in cement is_________________?

A. gypsum
B. calcium chloride
C. calcium carbonate
D. none of the above

96. In brick masonry the bond produced by laying alternate headers and stretchers in each course is known as_______________?

A. English bond
B. double flemish bond
C. zigzag bond
D. single flemish bond

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

A. iron
B. carbon
C. manganese
D. sulphur

98. 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 limestone
D. iron ore, carbon and limestone

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

A. ordinary Portland cement
B. low heat cement
C. rapid hardening cement
D. sulphate resisting cement

100. The ultimate tensile strength of structural mild steel is about_________________?

A. 160N/mm2
B. 260N/mm2
C. 420 N/mm2
D. 520 N/mm2