कृषि, पशु र वन विज्ञान B.Sc. Ag र B.V.Sc. & A.H. प्रवेश तयारी
कृषि, पशु र वन विज्ञान – B.Sc. Ag र B.V.Sc. & A.H. प्रवेश
B.Sc. Ag & B.V.Sc. Entrance · Agriculture, Veterinary & Forestry Entrance
२,४९३ प्रश्न उपलब्ध। मोड छान्नुहोस्:
कृषि, पशु र वन विज्ञान प्रवेश: 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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A stone is projected vertically upward at 30 m/s. Taking g = 10 m/s², the time after which it returns to the point of projection is:
सही उत्तर: ग) 6 s
Total time of flight T = 2u/g = 2 × 30/10 = 6 s. 3 s is only the time to reach the highest point.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Planck's constant has the same dimensions as:
सही उत्तर: ग) Angular momentum
h = E/f has units J·s = kg m² s⁻¹, which is the same as angular momentum (mvr). Energy alone lacks the extra time factor.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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During electrolysis, the process occurring at the cathode is:
सही उत्तर: क) Reduction
Cations move to the cathode and gain electrons, which is reduction. Oxidation always occurs at the anode in both electrolytic and galvanic cells.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A radioactive sample of 16 g has a half-life of 5 days. The mass left after 15 days is:
सही उत्तर: ग) 2 g
15 days is three half-lives, so 16 → 8 → 4 → 2 g. 4 g would remain after only two half-lives (10 days).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Rutherford's gold foil (α-particle scattering) experiment led to the discovery of the:
सही उत्तर: ग) Atomic nucleus
Most α-particles passed through but a few were deflected sharply, showing a tiny, dense, positive nucleus. The electron had already been discovered by Thomson.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Addition of HBr to propene (in the absence of peroxide) mainly gives:
सही उत्तर: ग) 2-Bromopropane
By Markovnikov's rule, H adds to the carbon already bearing more hydrogens, so Br goes to the middle carbon. In the presence of peroxide (Kharasch effect), 1-bromopropane is the main product.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The hybridisation of carbon in methane (CH₄) is:
सही उत्तर: ग) sp³
Carbon forms four equivalent σ bonds in a tetrahedral arrangement, which requires sp³ hybridisation. sp² is found in ethene and sp in ethyne.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The percentage by mass of oxygen in water (H₂O) is approximately:
सही उत्तर: क) 88.9%
Oxygen contributes 16 g out of 18 g per mole, i.e. 16/18 × 100 ≈ 88.9%. 66.7% is the mole (atom) fraction of hydrogen atoms, not a mass percentage of oxygen.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For an endothermic reaction, the enthalpy change ΔH is:
सही उत्तर: घ) Positive
An endothermic reaction absorbs heat, so the products have higher enthalpy and ΔH > 0. Exothermic reactions have negative ΔH.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Muriate of potash, a common potassic fertilizer, is chemically:
सही उत्तर: घ) Potassium chloride
'Muriate' is an old name for chloride, so muriate of potash (MOP) is KCl. Potassium sulphate is sold as sulphate of potash (SOP).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
यी अभ्यास प्रश्न हुन्, आधिकारिक प्रश्न होइनन्। पाठ्यक्रम, विज्ञापन र नतिजाका लागि सम्बन्धित निकायको आधिकारिक वेबसाइट हेर्नुहोस्। उत्तरमा गल्ती भेटे प्रश्नमुनिको "टिप्पणी / गल्ती रिपोर्ट" मा लेख्नुहोस्।
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