Building Materials

111. Cast steel is manufactured by

1. Cementation process
2. Crucible process
3. Bessemer process
4. Open hearth process

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112. Based on the following rocks and minerals, select the correct statement, quartz, shale, basalt, granite, marble, gypsum, mica

1. Basalt and marble are the only metamorphic rocks
2. There is no sedimentary rock
3. Granite is the only igneous rock
4. Quartz and mica are minerals

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113. The foliated structure is very common in

1. Sedimentary rocks
2. Igneous rocks
3. Metamorphic rocks
4. None of these

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114. Cross cut saw is used for

1. Cutting soft stones
2. Cutting hard stones
3. Cutting large blocks of stones
4. Dressing stones

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115. Pick up the correct statement from the following:

1. Catalysts are added to assist and accelerate the hardening of resin
2. The fillers are inert materials and they impart strength and hardness
3. Fibrous fillers increase thermal resistance
4. All the above

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116. A first class brick when immersed in cold water for 24 hours should not absorb water more than

1. 15%
2. 20
3. 22%
4. 25%

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117. The minimum compressive strength of 2nd class bricks should be

1. 75 kg/cm²
2. 90 kg/cm²
3. 100 kg/cm²
4. 120 kg/cm²

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

1. Over-burnt bricks
2. Under-burnt bricks
3. Refractory bricks
4. First class bricks

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119. Bulking of sand is caused due to

1. Surface moisture
2. Air voids
3. Viscosity
4. Clay contents

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120. According to IS specifications, the compressive strength of ordinary Portland cement after three days should not be less than

1. 7 MPa
2. 11.5 MPa
3. 16 MPa
4. 21 MPa

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