हाइड्रोलिक्स र सिँचाइ – Hydraulics & Irrigation MCQ
हाइड्रोलिक्स र सिँचाइ – सिभिल इन्जिनियरिङ
Hydraulics & Irrigation · Civil Engineering · ४०९ प्रश्न
४०९ प्रश्न उपलब्ध। मोड छान्नुहोस्:
हाइड्रोलिक्स र सिँचाइ: 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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The time factor of a canal is defined as the ratio of:
सही उत्तर: घ) Number of days the canal actually runs to the number of days of the irrigation period
Time factor = days of actual running/days of the irrigation period; capacity factor is mean supply/full supply discharge.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The 'outlet factor' in canal irrigation refers to the:
सही उत्तर: ख) Duty of water at the head of the watercourse (outlet)
Outlet factor is the duty measured at the outlet (head of the watercourse), expressed in hectares per cumec.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Waterlogging of agricultural land occurs when:
सही उत्तर: घ) The water table rises so high that the root zone becomes saturated
A high water table (often due to canal seepage and poor drainage) saturates the root zone, cutting off aeration and causing salinity.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Irrigation water contains Na⁺ = 10, Ca²⁺ = 4 and Mg²⁺ = 4 meq/L. Its sodium adsorption ratio is:
सही उत्तर: क) 5.0
SAR = 10/√[(4 + 4)/2] = 10/√4 = 5.0.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The sodium hazard of irrigation water is assessed by the:
सही उत्तर: ग) Sodium Adsorption Ratio (SAR)
SAR = Na⁺/√[(Ca²⁺ + Mg²⁺)/2] (in meq/L); high SAR water disperses soil and reduces permeability.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A soil has field capacity 25%, and irrigation is applied when moisture falls to 18% (dry weight basis). Dry density is 1.4 times that of water, root zone 0.6 m and consumptive use 5 mm/day. The irrigation interval is about:
सही उत्तर: ख) 12 days
Depth of water = (0.25 − 0.18) × 1.4 × 0.6 = 0.0588 m = 58.8 mm; interval = 58.8/5 ≈ 11.8 ≈ 12 days.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Water application efficiency in irrigation is the ratio of:
सही उत्तर: ख) Water stored in the root zone to water delivered to the field
ηa = water stored in root zone/water delivered to field; losses are surface runoff and deep percolation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A canal headworks diverts 10 m³/s, and 8 m³/s reaches the fields. The water conveyance efficiency is:
सही उत्तर: ख) 80%
ηc = water delivered to fields/water diverted × 100 = 8/10 × 100 = 80%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following is a Kharif (monsoon) crop in Nepal?
सही उत्तर: ग) Paddy (rice)
Kharif crops are sown with the monsoon (June–July) and harvested in autumn, e.g. rice and maize; wheat, mustard and barley are Rabi crops.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A current meter is used in stream gauging to measure:
सही उत्तर: ग) Velocity of flow at points in a river cross-section
The current meter's rotation rate gives point velocity; discharge is then computed by the area-velocity method.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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