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For testing compressive and tensile strength of cement, the cement mortar is made by mixing cement and standard sand in the proportions of
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Inner part of a timber log surrounding the pitch, is called
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The constituent of cement which is responsible for all the undesirable properties of cement is
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Pick up the correct statement from the following:
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Excess of alumina in brick earth makes the brick
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Due to attack of dry rot, the timber
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The rocks which are formed due to cooling of magma at a considerable depth from earth’s surface are called
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Which of the following has more fire resisting characteristics?
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For better C.O.P of refrigerator, the pressure range corresponding to temperature in evaporator and condenser must be
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The Freon group of refrigerants are
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