माटो र जग – Soil Mechanics & Foundation MCQ
माटो र जग – सिभिल इन्जिनियरिङ
Soil Mechanics & Foundation · Civil Engineering · ४०१ प्रश्न
४०१ प्रश्न उपलब्ध। मोड छान्नुहोस्:
माटो र जग: 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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Using Hazen's formula k = C·D10² with C = 100 (k in cm/s, D10 in cm), the permeability of a sand with D10 = 0.2 mm is:
सही उत्तर: ख) 0.04 cm/s
D10 = 0.02 cm; k = 100 × 0.02² = 0.04 cm/s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In clays, a flocculated structure is characterised by:
सही उत्तर: ख) Edge-to-face contacts between particles due to net attractive forces
Flocculated clay has random edge-to-face contacts (attraction dominant); dispersed clay has parallel, face-to-face particles.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Among the common clay minerals, the one that is most stable and shows the least swelling is:
सही उत्तर: घ) Kaolinite
Kaolinite layers are held by strong hydrogen bonds, so it absorbs little water and swells least; montmorillonite swells most.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For a sand to be classified as well graded (SW), the coefficient of uniformity Cu and coefficient of curvature Cc should be:
सही उत्तर: ख) Cu greater than 6 and Cc between 1 and 3
Well-graded sand needs Cu > 6 and 1 ≤ Cc ≤ 3; for well-graded gravel Cu > 4.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the IS classification system, the group symbol 'CI' represents:
सही उत्तर: घ) Clay of intermediate plasticity (LL 35% to 50%)
IS divides fine soils by LL into L (below 35), I (35–50) and H (above 50); 'CI' is clay of intermediate plasticity.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the IS soil classification, the particle size range of silt is:
सही उत्तर: क) 75 μm to 2 μm
Silt lies between 75 μm and 2 μm; particles finer than 2 μm are clay size.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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As per the IS classification of soils, the particle size boundary between gravel and sand is:
सही उत्तर: क) 4.75 mm
Gravel is coarser than 4.75 mm, sand is from 4.75 mm to 75 μm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The toughness index of a soil is defined as the ratio of:
सही उत्तर: घ) Plasticity index to flow index
It = Ip/If, where If is the slope of the flow curve (water content vs log of number of blows).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the cone penetration method (IS 2720 Part 5) for liquid limit, the liquid limit is the water content at which the standard cone penetrates:
सही उत्तर: घ) 20 mm
The liquid limit by the cone penetrometer is the water content corresponding to 20 mm penetration of the standard cone.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A soil has liquid limit 50%, plastic limit 25% and natural water content 30%. Its consistency index is:
सही उत्तर: ग) 0.8
Ic = (LL − w)/PI = (50 − 30)/25 = 0.8; a value near 1 indicates a stiff soil.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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