आईओई इन्जिनियरिङ प्रवेश (त्रिवि) BE / B.Arch प्रवेश परीक्षा तयारी
आईओई इन्जिनियरिङ प्रवेश (त्रिवि) – BE / B.Arch प्रवेश परीक्षा
IOE BE / B.Arch Entrance · IOE Entrance (TU)
३,८४१ प्रश्न उपलब्ध। मोड छान्नुहोस्:
BE/B.Arch 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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Lenses of power +2 D and −0.5 D are placed in contact. The focal length of the combination is about:
सही उत्तर: ख) 66.7 cm
P = 2 − 0.5 = +1.5 D, so f = 1/1.5 m ≈ 0.667 m = 66.7 cm (converging).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The image of a real object formed by a convex mirror is always:
सही उत्तर: क) virtual, erect and diminished
A convex mirror diverges light, so for any real object the image is virtual, erect, diminished and lies between the pole and focus.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An object is placed 15 cm in front of a concave mirror of focal length 10 cm. The image is formed:
सही उत्तर: घ) 30 cm in front of the mirror
With u = −15 cm and f = −10 cm, 1/v = 1/f − 1/u = −1/10 + 1/15 = −1/30, so v = −30 cm: a real image 30 cm in front.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When one prong of a tuning fork is loaded with a little wax, its frequency:
सही उत्तर: ग) decreases
Loading increases the vibrating mass, which lowers the natural frequency of the fork.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Ultrasonic waves are sound waves of frequency:
सही उत्तर: ख) above 20 kHz
Human hearing ranges from about 20 Hz to 20 kHz; waves above 20 kHz are ultrasonic.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A string 1 m long, fixed at both ends, carries transverse waves at 200 m/s. Its fundamental frequency is:
सही उत्तर: क) 100 Hz
For the fundamental mode λ = 2L = 2 m, so f = v/λ = 200/2 = 100 Hz.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A stationary source emits 400 Hz. An observer moves directly away from it at one-tenth the speed of sound. The frequency heard is:
सही उत्तर: घ) 360 Hz
f′ = f(v − v₀)/v = 400 × (1 − 0.1) = 360 Hz.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The second overtone of an organ pipe closed at one end is its:
सही उत्तर: ग) fifth harmonic
A closed pipe has only odd harmonics: fundamental = 1st, first overtone = 3rd, second overtone = 5th harmonic.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If the amplitude of a sound wave is doubled (frequency unchanged), its intensity becomes:
सही उत्तर: ख) 4 times
Intensity is proportional to the square of the amplitude, so it becomes 2² = 4 times.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When a sound wave passes from air into water, the quantity that remains unchanged is its:
सही उत्तर: क) frequency
Frequency is fixed by the source; speed and wavelength change in the new medium.
💬 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।