इन्जिनियरिङ प्रवेश – Mathematics, Physics, Chemistry, English
इन्जिनियरिङ प्रवेश – Mathematics, Physics, Chemistry, English
Engineering Entrance – Mathematics, Physics, Chemistry & English · ३,८४१ प्रश्न
३,८४१ प्रश्न उपलब्ध। मोड छान्नुहोस्:
इन्जिनियरिङ 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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When white light passes through a glass prism, the colour deviated the most is:
सही उत्तर: घ) Violet
Glass has the highest refractive index for violet light (shortest wavelength among visible colours), so it deviates most. Red deviates the least.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The blue colour of the clear sky is mainly due to:
सही उत्तर: ग) Scattering of light
Rayleigh scattering is proportional to 1/λ⁴, so shorter (blue) wavelengths are scattered much more by air molecules. Dispersion explains the rainbow, not the blue sky.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two thin convex lenses each of focal length 20 cm are placed in contact. The focal length of the combination is:
सही उत्तर: ख) 10 cm
1/F = 1/20 + 1/20 = 1/10, so F = 10 cm. Powers add in contact, so the combination is stronger and has a shorter focal length.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Total internal reflection can occur when light travels:
सही उत्तर: घ) From a denser to a rarer medium at an angle of incidence greater than the critical angle
Both conditions are needed: denser to rarer medium and angle of incidence exceeding the critical angle. Optical fibres work on this principle.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The speed of light in a glass of refractive index 1.5 is:
सही उत्तर: ग) 2 × 10⁸ m/s
v = c/n = 3 × 10⁸ / 1.5 = 2 × 10⁸ m/s. Light is slower in an optically denser medium, so it can never exceed 3 × 10⁸ m/s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If the intensity of a sound is increased by a factor of 10, the sound level increases by:
सही उत्तर: ख) 10 dB
β = 10 log₁₀(I/I₀); multiplying I by 10 adds 10 log₁₀10 = 10 dB. 20 dB corresponds to a 100-fold increase in intensity.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a stationary wave, the distance between a node and the adjacent antinode is:
सही उत्तर: क) λ/4
Consecutive nodes are λ/2 apart, and an antinode lies midway between them, so node-to-antinode distance is λ/4.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The speed of a transverse wave on a string under tension 100 N with linear mass density 0.01 kg/m is:
सही उत्तर: घ) 100 m/s
v = √(T/μ) = √(100/0.01) = √10⁴ = 100 m/s. 10⁴ m/s is T/μ without taking the square root.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When a sound source moves towards a stationary observer, the frequency heard by the observer:
सही उत्तर: ग) Increases
By the Doppler effect, the waves get compressed in front of an approaching source, so the apparent frequency increases. It decreases when the source moves away.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The fundamental frequency of a pipe of length 0.85 m closed at one end is (speed of sound = 340 m/s):
सही उत्तर: ख) 100 Hz
For a closed pipe f = v/(4L) = 340/(4 × 0.85) = 100 Hz. 200 Hz would be the fundamental if the pipe were open at both ends.
💬 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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