Building Materials

121. Pick up the correct statement from the following:

1. Plastics have generally low melting point
2. The coefficient of thermal expansion of plastics is about three times than that of steel
3. The acoustical boards prepared by impregnating fibre-glass with phenolic resins has absorption coefficient of about 0.67
4. All the above

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122. The amount of water used for one kg of distemper is

1. 0.2 liter
2. 0.4 liter
3. 0.6 liter
4. 0.8 liter

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123. Smith's test of stones is performed to find out

1. The presence of soluble matter of stone
2. The compressive strength of the stone
3. The hardness of the stone
4. The toughness of the stone

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124. The most important tool in brick laying for lifting and spreading mortar and for forming joints is

1. Trowel
2. Square
3. Bolster
4. Scutch

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125. The weight of 1 m³ of brick earth, is about

1. 1200 kg
2. 1500 kg
3. 1800 kg
4. 2000 kg

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126. Which of the following is a mineral?

1. Basalt
2. Granite
3. Quartz
4. Syenite

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127. Age of a tree may be ascertained by

1. Radius of its stem
2. Circumference of its stem
3. Number of branches
4. Number of annual rings

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128. Crushing strength of a good building stone should be more than

1. 50 MPa
2. 100 MPa
3. 150 MPa
4. 200 MPa

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129. Generally wooden moulds are made from

1. Ply wood
2. Shishum wood
3. Deodar wood
4. Teak wood

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130. The nominal size of the modular brick is

1. 190 mm × 90 mm × 80 mm
2. 190 mm × 190 mm × 90 mm
3. 200 mm × 100 mm × 100 mm
4. 200 mm × 200 mm × 100 mm

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