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 beam of monochromatic light is incident on a single slit of width 'd'. The central bright fringe in the diffraction pattern is observed to be three times wider than the central fringe. What is the value of 'd'?
सही उत्तर: क) 1/3λ
The width of the central maximum in single-slit diffraction is proportional to λ/a, where λ is the wavelength and a is the slit width. Here, the central bright fringe is three times wider than the central fringe so 3 = (λ/d) * d/d implies that d = 1/3λ. The other options are incorrect as they don't correctly relate to the relationship of width and wavelength.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Heat can be transferred through conduction by:
सही उत्तर: ग) Transferring heat via molecular collisions between objects at different temperatures
Conduction is the transfer of heat through direct contact and molecular vibrations. Option 1 is radiation, option 3 describes thermal conductivity, and option 4 is related to thermodynamics.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A particle moves with uniform angular velocity ω. Which of the following statements is correct?
सही उत्तर: ख) Its direction changes continuously
Uniform angular velocity means the rate at which an object rotates (or revolves) remains constant. This translates to a consistent rotational speed, and therefore, its speed is constant. Options 2,3 & 4 are incorrect because they describe changes in other physical quantities.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A circuit consists of a 24 V battery connected to a series of three resistors: R1 = 10 Ω, R2 = 20 Ω, and R3 = 30 Ω. What is the current flowing through R2?
सही उत्तर: ख) 1.0 A
The total resistance in the circuit is (10 + 20 + 30) = 60 Ω. Using Ohm's Law (V=IR), the current flowing through R2 (which is part of the entire series) is I = V/R = 24V / 60Ω = 0.4 A. Option 1, 0.5A is closest due to rounding.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The speed of sound in air depends primarily on:
सही उत्तर: घ) All of the above
The speed of sound is directly proportional to the square root of the density and temperature of the medium (air) through which it travels. While all factors contribute, 'all of the above' is the most accurate reflection of the relationship. Options A, B, and C are only partially correct.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If the angle of incidence of a ray of light on a surface is 60°, then the angle of reflection will be:
सही उत्तर: ग) 90°
The law of reflection states that the angle of incidence equals the angle of reflection. Therefore, if the angle of incidence is 60°, the angle of reflection must also be 60°. Options A, B, and C are incorrect as they represent different angles.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The phenomenon where an object appears distorted due to the bending of light around it is known as:
सही उत्तर: घ) Aberration
Aberration (or chromatic aberration) refers to the distortion of images caused by the refraction of different wavelengths of light by a lens. This leads to blurred edges and distortions in the image. Options A, B, and C describe other optical phenomena.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A light ray traveling from glass (n=1.5) into air (n=1) will experience:
सही उत्तर: ख) Refraction away from the normal
When a light ray transitions from a medium with a higher refractive index (glass) to a medium with a lower refractive index (air), it bends away from the normal. This is because the speed of light decreases in air. Options A and C are incorrect as they describe refraction towards the normal; option D describes total internal reflection.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The SI unit of wave velocity is:
सही उत्तर: क) m/s
Wave velocity (v) is defined as the distance traveled by a wave per unit time. The SI unit for distance is meter (m) and the SI unit for time is second (s). Therefore, the correct unit of wave velocity is m/s. Option B is incorrect because kg/m² is the unit of density, option C is incorrect as it's the unit of energy, and option D is incorrect due to its association with force.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A beam of light is incident on a water surface at an angle of 30 degrees to the normal. What is the angle of refraction? (Assume refractive index of water is 1.33)
सही उत्तर: घ) 60°
Snell's law states: n₁sinθ₁ = n₂sinθ₂, where n₁ and n₂ are the refractive indices of the two media, and θ₁ and θ₂ are the angles of incidence and refraction respectively. In this case, n₁ = 1 (air), θ₁ = 30°, and n₂ = 1.33. Solving for θ₂: 1 * sin(30°) = 1.33 * sin(θ₂) => sin(θ₂) = 0.5 => θ₂ = 30° (approximately). The options are all incorrect as they don't accurately apply Snell's Law.
💬 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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