CTEVT डिप्लोमा इन्जिनियरिङ डिप्लोमा इन सिभिल/कम्प्युटर/इलेक्ट्रिकल प्रवेश तयारी
CTEVT डिप्लोमा इन्जिनियरिङ – डिप्लोमा इन सिभिल/कम्प्युटर/इलेक्ट्रिकल प्रवेश
CTEVT Diploma Entrance · CTEVT Diploma in Engineering
१,५७१ प्रश्न उपलब्ध। मोड छान्नुहोस्:
CTEVT डिप्लोमा 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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The percentage of nitrogen by mass in ammonia (NH₃) is about (N = 14, H = 1):
सही उत्तर: घ) 82.4%
% N = 14/17 × 100 ≈ 82.4%. 17.6% is the percentage of hydrogen.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The number of molecules present in 0.5 mole of a gas is:
सही उत्तर: ग) 3.011 × 10²³
Number of molecules = moles × Avogadro's number = 0.5 × 6.022 × 10²³ = 3.011 × 10²³. 6.022 × 10²³ is for one full mole.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The number of moles in 36 g of water is (H = 1, O = 16):
सही उत्तर: क) 2
Molar mass of H₂O = 18 g/mol, so moles = 36/18 = 2. 648 comes from multiplying instead of dividing.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 50 kg person stands on a planet where the acceleration due to gravity is twice that on Earth (take Earth's g = 10 m/s²). The person's weight there is:
सही उत्तर: ग) 1000 N
Weight = m × g = 50 × 20 = 1000 N. The mass remains 50 kg; 500 N is the weight on Earth.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Light from the Sun travels about 1.5 × 10⁸ km to reach the Earth at 3 × 10⁵ km/s. The time taken is about:
सही उत्तर: ग) 8.3 minutes
t = d/v = 1.5 × 10⁸ / 3 × 10⁵ = 500 s ≈ 8.3 minutes. This is why we see the Sun as it was about 8 minutes ago.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A bicycle dynamo lights a lamp when the wheel turns. It works on the principle of:
सही उत्तर: ख) Electromagnetic induction
Rotating a magnet near a coil changes the magnetic flux and induces a current (electromagnetic induction). An electric motor, in contrast, converts electrical energy into mechanical energy.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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To find the direction of force on a current-carrying conductor placed in a magnetic field (as in an electric motor), we use:
सही उत्तर: क) Fleming's left-hand rule
Fleming's left-hand rule gives the direction of force in motors. The right-hand rule is used for the direction of induced current in generators.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A transformer has 200 turns in the primary and 1000 turns in the secondary. If the input is 220 V AC, the output voltage is:
सही उत्तर: घ) 1100 V
Vs/Vp = Ns/Np, so Vs = 220 × 1000/200 = 1100 V; it is a step-up transformer. 44 V would result from inverting the turns ratio.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A current of 2 A flows through a wire for 1 minute. The charge passing through it is:
सही उत्तर: क) 120 C
Q = I × t = 2 × 60 = 120 C. Time must be converted to seconds; using t = 1 gives the wrong answer 2 C.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Four bulbs of 60 W each are used for 5 hours. The electrical energy consumed is:
सही उत्तर: क) 1.2 kWh
Energy = 4 × 60 W × 5 h = 1200 Wh = 1.2 kWh. 1200 is the value in Wh, not kWh.
💬 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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