रसायन विज्ञान – Chemistry MCQ
रसायन विज्ञान – कृषि/वन प्रवेश
Chemistry · Agriculture, Veterinary & Forestry Entrance · ४०९ प्रश्न
४०९ प्रश्न उपलब्ध। मोड छान्नुहोस्:
रसायन विज्ञान: 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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During lightning, atmospheric nitrogen is fixed mainly as:
सही उत्तर: घ) oxides of nitrogen, which form nitrates in the soil
The high temperature makes N₂ combine with O₂ to form NO, which is converted to nitric acid and reaches the soil as nitrates.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Urea is manufactured industrially from:
सही उत्तर: ख) ammonia and carbon dioxide
2NH₃ + CO₂ → NH₂CONH₂ + H₂O under high pressure and temperature.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Single superphosphate is manufactured by treating rock phosphate with:
सही उत्तर: क) sulphuric acid
Ca₃(PO₄)₂ + 2H₂SO₄ gives water-soluble Ca(H₂PO₄)₂ mixed with calcium sulphate.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Diammonium phosphate (DAP), (NH₄)₂HPO₄, supplies which plant nutrients?
सही उत्तर: क) Nitrogen and phosphorus
DAP contains about 18% N and 46% P₂O₅.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The three primary (major) plant nutrients supplied by NPK fertilisers are:
सही उत्तर: घ) nitrogen, phosphorus and potassium
N, P and K are needed in the largest amounts; Ca, Mg and S are secondary nutrients.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The monomer of polythene (polyethylene) is:
सही उत्तर: क) ethene
Addition polymerisation of ethene, CH₂=CH₂, gives polyethylene.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The chemical name of vitamin C is:
सही उत्तर: ग) ascorbic acid
Vitamin C is ascorbic acid; its deficiency causes scurvy. Retinol is vitamin A.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Fats and oils are chemically:
सही उत्तर: ख) esters of glycerol and fatty acids
They are triglycerides, i.e. triesters formed from glycerol and three fatty acid molecules.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Cellulose, the main constituent of plant cell walls, is a polymer of:
सही उत्तर: ग) β-D-glucose
Cellulose consists of β-glucose units joined by β(1→4) links, which humans cannot digest; starch is made of α-glucose.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Proteins are polymers made up of:
सही उत्तर: ग) amino acids
Amino acids are joined by peptide bonds to form proteins.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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