कृषि, पशु र वन विज्ञान प्रवेश
कृषि, पशु र वन विज्ञान प्रवेश
Agriculture, Veterinary & Forestry Entrance · २,४९३ प्रश्न
२,४९३ प्रश्न उपलब्ध। मोड छान्नुहोस्:
कृषि/वन 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 p-n junction diode is forward biased when:
सही उत्तर: ख) the p-side is connected to the positive terminal and the n-side to the negative terminal
Forward bias lowers the barrier potential so that current flows easily.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the photoelectric effect, the maximum kinetic energy of the emitted electrons depends on:
सही उत्तर: ग) the frequency of the incident light
KE_max = hf − φ; intensity only changes the number of electrons emitted.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The inductive reactance of a coil:
सही उत्तर: घ) increases as the AC frequency increases
X_L = 2πfL, so it is directly proportional to frequency (and zero for DC).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a balanced Wheatstone bridge with resistances P, Q, R and S in the four arms, the condition is:
सही उत्तर: घ) P/Q = R/S
At balance no current flows through the galvanometer and P/Q = R/S.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A cell of emf 12 V and internal resistance 1 Ω is connected to an external resistance of 5 Ω. The current in the circuit is:
सही उत्तर: घ) 2 A
I = E/(R + r) = 12/(5 + 1) = 2 A.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A rainbow is formed due to:
सही उत्तर: क) refraction, dispersion and total internal reflection of sunlight in raindrops
Sunlight is refracted and dispersed on entering a drop, totally internally reflected inside, and refracted again on leaving.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When a source of sound moves towards a stationary listener, the frequency heard by the listener:
सही उत्तर: ख) is higher than the actual frequency
By the Doppler effect, the waves are crowded together, so the apparent frequency increases.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The heat needed to melt 2 kg of ice at 0 °C into water at 0 °C is (latent heat of fusion = 3.36 × 10⁵ J/kg):
सही उत्तर: घ) 6.72 × 10⁵ J
Q = mL = 2 × 3.36 × 10⁵ = 6.72 × 10⁵ J.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Young's modulus of a material is the ratio of:
सही उत्तर: घ) longitudinal stress to longitudinal strain
Y = (F/A)/(ΔL/L); bulk modulus uses volume, rigidity modulus uses shear, and Poisson's ratio is lateral/longitudinal strain.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If the length of a simple pendulum is made four times, its time period becomes:
सही उत्तर: ग) twice
T = 2π√(l/g) ∝ √l, so T becomes √4 = 2 times.
💬 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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