निर्माण सामग्री – Construction Materials MCQ
निर्माण सामग्री – सिभिल इन्जिनियरिङ
Construction Materials · Civil Engineering · १,००८ प्रश्न
१,००८ प्रश्न उपलब्ध। मोड छान्नुहोस्:
निर्माण सामग्री: प्रश्न र उत्तर
सही लागेको विकल्पमा थिच्नुहोस्। सही भए हरियो, गलत भए रातो देखिन्छ; ३ सेकेन्डपछि सही उत्तर र व्याख्या देखिन्छ।
सही: ० / ०
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For the flexural strength test of concrete with aggregate up to 20 mm, the standard beam specimen size is:
सही उत्तर: क) 150 mm × 150 mm × 700 mm
Beams of 150 × 150 × 700 mm tested under two-point loading on a 600 mm span are used to find the modulus of rupture.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When the strength of concrete in an existing structure is doubtful, a cylindrical sample is drilled out of the member and tested. This is called the:
सही उत्तर: घ) Core test
The core test gives the actual compressive strength of in-place concrete and is partially destructive.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The Poisson's ratio of normal concrete generally lies in the range:
सही उत्तर: ग) 0.15 to 0.20
For design purposes the Poisson's ratio of concrete is usually taken as about 0.15 to 0.20.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The direct tensile strength of normal concrete is roughly what fraction of its compressive strength?
सही उत्तर: ख) About one-tenth
Concrete is weak in tension; its tensile strength is typically around 8% to 12% of its compressive strength.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Drying shrinkage of hardened concrete is mainly caused by:
सही उत्तर: क) Loss of water held in the fine pores of the cement paste
As concrete dries, water is lost from capillary and gel pores of the paste, causing it to contract.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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IS 456 limits the cement content (excluding fly ash and slag) in concrete to not more than:
सही उत्तर: घ) 450 kg/m³
Cement content above 450 kg/m³ increases shrinkage and heat of hydration, so it should not be exceeded unless specially considered.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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As per IS 456, the minimum cement content for reinforced concrete under 'mild' exposure is:
सही उत्तर: ग) 300 kg/m³
For RCC in mild exposure the minimum cement content is 300 kg/m³ (with maximum w/c 0.55 and minimum grade M20).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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As per IS 456, the nominal concrete cover to reinforcement for 'moderate' exposure conditions is:
सही उत्तर: ख) 30 mm
IS 456 specifies nominal cover of 20, 30, 45, 50 and 75 mm for mild, moderate, severe, very severe and extreme exposure respectively.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For placing concrete under water, the method commonly used is the:
सही उत्तर: क) Tremie pipe method
A tremie pipe keeps its lower end embedded in fresh concrete so that it is placed without washing out the cement.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In an aggregate impact value test, the oven-dried sample weighs 350 g and the fines passing the 2.36 mm sieve after the test weigh 70 g. The aggregate impact value is:
सही उत्तर: घ) 20%
AIV = weight of fines / total weight × 100 = 70/350 × 100 = 20%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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