CTEVT डिप्लोमा इन्जिनियरिङ प्रवेश
CTEVT डिप्लोमा इन्जिनियरिङ प्रवेश
CTEVT Diploma Engineering Entrance · १,५७१ प्रश्न
१,५७१ प्रश्न उपलब्ध। मोड छान्नुहोस्:
डिप्लोमा 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 refractive index of glass is 1.5. If light travels at 3 × 10⁸ m/s in vacuum, its speed in glass is:
सही उत्तर: ग) 2 × 10⁸ m/s
v = c/n = 3 × 10⁸ / 1.5 = 2 × 10⁸ m/s. Light slows down in a denser medium, so 4.5 × 10⁸ m/s is impossible.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A person standing in front of a cliff hears the echo of a shout 2 s later. If sound travels at 340 m/s, the distance to the cliff is:
सही उत्तर: ग) 340 m
Sound travels to the cliff and back, so distance = (v × t)/2 = (340 × 2)/2 = 340 m. 680 m is the total to-and-fro path.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A temperature of 77 °F is equal to:
सही उत्तर: क) 25 °C
C = (F − 32) × 5/9 = (77 − 32) × 5/9 = 25 °C. 45 is (F − 32) before multiplying by 5/9.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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2 kg of water at 60 °C is mixed with 1 kg of water at 30 °C. Neglecting heat loss, the final temperature is:
सही उत्तर: ग) 50 °C
2(60 − T) = 1(T − 30) gives 3T = 150, T = 50 °C. 45 °C is the simple average, which is wrong because the masses are unequal.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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1 kg of water at 80 °C is mixed with 1 kg of water at 20 °C. Neglecting heat loss, the final temperature is:
सही उत्तर: ख) 50 °C
Heat lost = heat gained: 1 × c × (80 − T) = 1 × c × (T − 20), so T = 50 °C. For equal masses of the same liquid the final temperature is the simple average.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The heat needed to raise the temperature of 2 kg of water by 10 °C (specific heat of water = 4200 J/kg°C) is:
सही उत्तर: क) 84000 J
Q = mcΔT = 2 × 4200 × 10 = 84000 J. 42000 J is the heat for only 1 kg.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A load of 300 N is lifted using a single ideal movable pulley. The effort needed is:
सही उत्तर: घ) 150 N
A single movable pulley has a mechanical advantage of 2 (ideal), so effort = 300/2 = 150 N. A single fixed pulley would need 300 N because its MA is 1.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a lever, the effort arm is 2 m and the load arm is 0.5 m. Neglecting friction, the effort needed to lift a 400 N load is:
सही उत्तर: ख) 100 N
By the principle of moments, E × 2 = 400 × 0.5, so E = 100 N. A longer effort arm reduces the effort needed.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A machine is supplied 500 J of energy and does 400 J of useful work. Its efficiency is:
सही उत्तर: ख) 80%
Efficiency = output/input × 100 = 400/500 × 100 = 80%. Efficiency of a real machine can never exceed 100%, so 125% is impossible.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A ball is dropped from a height of 20 m. Neglecting air resistance (g = 10 m/s²), its speed just before hitting the ground is:
सही उत्तर: घ) 20 m/s
Using energy conservation, mgh = ½mv², so v = √(2gh) = √400 = 20 m/s. 400 is v², not v.
💬 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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