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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The Sun is seen a little before it actually rises above the horizon because of:
सही उत्तर: ग) atmospheric refraction
Light bends as it passes through the denser lower atmosphere, raising the Sun's apparent position (about 2 minutes earlier sunrise).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Stars appear to twinkle mainly because of:
सही उत्तर: ख) atmospheric refraction of their light
Starlight passes through layers of air of changing refractive index, so its apparent position and brightness keep fluctuating.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The power of a concave lens of focal length 25 cm is:
सही उत्तर: घ) −4 D
P = 1/f (in metres) = 1/(−0.25) = −4 D; a concave lens has negative power.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Convex mirrors are used as rear-view mirrors in vehicles because they:
सही उत्तर: क) give a wider field of view with erect images
A convex mirror always gives an erect, diminished image and covers a wide area behind the vehicle.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The image formed by a plane mirror is:
सही उत्तर: ख) virtual, erect, of the same size and laterally inverted
A plane mirror forms a virtual, upright, same-size image as far behind the mirror as the object is in front, with left and right interchanged.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A ship's SONAR receives the echo from the sea bed 2 s after sending an ultrasonic pulse. If sound travels at 1500 m/s in sea water, the depth of the sea is:
सही उत्तर: ख) 1500 m
The pulse travels down and back, so depth = vt/2 = 1500 × 2 / 2 = 1500 m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Soldiers are ordered to break step while crossing a suspension bridge to avoid:
सही उत्तर: घ) resonance
If the marching frequency matched the bridge's natural frequency, the amplitude could build up dangerously (resonance).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Ten waves pass a point in 2 s, and the distance between successive crests is 2 m. The speed of the waves is:
सही उत्तर: ग) 10 m/s
f = 10/2 = 5 Hz and λ = 2 m, so v = fλ = 5 × 2 = 10 m/s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Thunder is heard 3 s after a lightning flash is seen. Taking the speed of sound as 340 m/s, the distance of the lightning is about:
सही उत्तर: ग) 1020 m
Light arrives almost instantly, so distance = speed of sound × time = 340 × 3 = 1020 m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Bats find their way in the dark by emitting and receiving:
सही उत्तर: ग) ultrasonic waves
Bats use echolocation with ultrasound above 20 kHz.
💬 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।
नमस्ते! पाठ्यक्रम, सामान्य ज्ञान, भाषा परीक्षा वा कुनै प्रश्नको उत्तर बुझ्न सोध्नुहोस्।
AI ले गल्ती गर्न सक्छ। महत्वपूर्ण कुरा आधिकारिक स्रोतमा जाँच्नुहोस्।