Building Materials MCQ

81. Gypsum is a

A. Mechanically formed sedimentary rock

B. Igneous rock

C. Chemically precipitated sedimentary rock

D. Metamorphic rock

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82. Seasoning of timber is done

A. To make it waterproof

B. To paint its surface

C. To increase its temperature

D. To remove water

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83. Pick up the correct statement from the following

A. Styrene resin is produced from ethylene which is made from petroleum

B. Styrene resin is light in weight

C. Styrene resin transmits ultraviolet waves of light

D. All the above

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84. The initial setting time for ordinary Portland cement as per IS specifications should not be less than

A. 10minutes

B.30minutes

C. 60minutes

D. 600 minutes

85. Rapid hardening cement attains early strength due to

A. A larger proportion of lime grounded finer than normal cement

B. A lesser proportion of lime grounded coarser than normal cement

C. A lesser proportion of lime grounded finer than normal cement

D. Excess percentage of gypsum

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86. With an increase in moisture content, the bulking of sand

A. Increases

B. Decreases

C. First increases to a certain maximum value and then decreases

D. First decrease to a certain minimum value and then increases

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87. Compared to mild steel, cast iron has

A. High compressive strength

B. High tensile strength

C. Low compressive strength

D. Low tensile strength The correct

A. (i) and(ii)

B. (ii) and(iii)

C. (iii) and(iv)

D. (i) and (iv)

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88. In a mortar, the binding material is

A. Cement

B. Sand

C. Sakhi

D. Cinder

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89. The vehicle used in the case of enamel paints is usually

A. Linseed oil

B. Water

C. Varnish

D. None of the

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90. A proper amount of entrained air in concrete results in

i. Better workability

ii. Better resistance to freezing and thawing

iii. Lesserworkability

iv. Less resistance to freezing and thawing

A.(i) and(ii)

B. (i) and (iv)

C.(ii) and(iii)

D.(iii) and (iv)

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