निर्माण सामग्री – Construction Materials MCQ

निर्माण सामग्री: प्रश्न र उत्तर

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सही: ० / ०

561. Annealing of glass during manufacture is done in order to:

     कMake the glass shatter into small granules खColour the glass गRelieve internal stresses by slow, controlled cooling घCoat the glass with tin
     💬 टिप्पणी / गल्ती रिपोर्ट (०)

     छलफल / प्रश्न उत्तरमा गल्ती छ

     पठाउनुहोस्

     टिप्पणी जाँचपछि मात्र देखिन्छ।

562. Structurally, ordinary glass is best described as:

     कA crystalline metal खAn amorphous (non-crystalline) solid, often called a super-cooled liquid गA thermosetting plastic घA sedimentary rock
     💬 टिप्पणी / गल्ती रिपोर्ट (०)

     छलफल / प्रश्न उत्तरमा गल्ती छ

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     टिप्पणी जाँचपछि मात्र देखिन्छ।

563. The spreading rate (covering capacity) of a paint is usually expressed in:

     कSquare metres per litre खLitres per cubic metre गKilograms per square metre घMetres per second
     💬 टिप्पणी / गल्ती रिपोर्ट (०)

     छलफल / प्रश्न उत्तरमा गल्ती छ

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     टिप्पणी जाँचपछि मात्र देखिन्छ।

564. Aluminium paint is often used on water tanks, pipes and roofs because it:

     कCan be applied only on wood खIs the cheapest paint available गAbsorbs heat strongly घReflects heat and light well and resists corrosion
     💬 टिप्पणी / गल्ती रिपोर्ट (०)

     छलफल / प्रश्न उत्तरमा गल्ती छ

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     टिप्पणी जाँचपछि मात्र देखिन्छ।

565. Wrinkling of a paint film is mainly caused by:

     कUsing a very thin coat खApplying paint on a perfectly dry surface गApplying the paint too thickly, so that the surface dries faster than the paint below घAdding extender to the paint
     💬 टिप्पणी / गल्ती रिपोर्ट (०)

     छलफल / प्रश्न उत्तरमा गल्ती छ

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     टिप्पणी जाँचपछि मात्र देखिन्छ।

566. In painting new woodwork, 'knotting' refers to:

     कFilling nail holes with putty खCovering knots with a sealer such as shellac so that resin does not exude and spoil the paint गApplying the final glossy coat घSanding the surface with a coarse paper
     💬 टिप्पणी / गल्ती रिपोर्ट (०)

     छलफल / प्रश्न उत्तरमा गल्ती छ

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     टिप्पणी जाँचपछि मात्र देखिन्छ।

567. A brick with bed face dimensions 190 mm × 90 mm fails under a compressive load of 280 kN. Its compressive strength is about:

     क16.4 N/mm² ख1.64 N/mm² ग31.1 N/mm² घ164 N/mm²
     💬 टिप्पणी / गल्ती रिपोर्ट (०)

     छलफल / प्रश्न उत्तरमा गल्ती छ

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568. Corrosion of reinforcement causes cracking and spalling of concrete cover mainly because:

     कRust increases the strength of steel खRust dissolves the cement paste गRust makes the steel contract घThe rust formed occupies a much larger volume than the original steel
     💬 टिप्पणी / गल्ती रिपोर्ट (०)

     छलफल / प्रश्न उत्तरमा गल्ती छ

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     टिप्पणी जाँचपछि मात्र देखिन्छ।

569. Hardening of steel is done by heating it above the critical temperature and then:

     कCooling it in still air खCooling it very slowly in the furnace गCooling it rapidly by quenching in water or oil घKeeping it at that temperature for several days
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570. A TMT reinforcing bar, as a result of quenching followed by self-tempering, has:

     कA uniform soft structure throughout खA hard tempered martensite outer rim and a soft, ductile ferrite-pearlite core गA hard core and a soft outer surface घA twisted surface produced by cold working
     💬 टिप्पणी / गल्ती रिपोर्ट (०)

     छलफल / प्रश्न उत्तरमा गल्ती छ

     पठाउनुहोस्

     टिप्पणी जाँचपछि मात्र देखिन्छ।