भौतिक विज्ञान – Physics MCQ
भौतिक विज्ञान – कृषि/वन प्रवेश
Physics · Agriculture, Veterinary & Forestry Entrance · ४२५ प्रश्न
४२५ प्रश्न उपलब्ध। मोड छान्नुहोस्:
भौतिक विज्ञान: 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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Resistors of 4 Ω and 12 Ω are connected in parallel across a 6 V battery of negligible internal resistance. The total current drawn is:
सही उत्तर: ग) 2 A
Currents are 6/4 = 1.5 A and 6/12 = 0.5 A; total = 2 A (equivalently 6 V ÷ 3 Ω).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A heater coil is cut into two equal halves and only one half is used on the same supply voltage. Its power becomes:
सही उत्तर: ख) double
Halving the length halves the resistance; P = V²/R, so the power doubles.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Three resistors of 6 Ω each are connected so that two are in parallel and this pair is in series with the third. The equivalent resistance is:
सही उत्तर: ख) 9 Ω
Two 6 Ω in parallel give 3 Ω; adding the third in series gives 3 + 6 = 9 Ω.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An electric iron rated 1000 W works on a 250 V supply. The current it draws is:
सही उत्तर: क) 4 A
I = P/V = 1000/250 = 4 A.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Household appliances are connected in parallel mainly because:
सही उत्तर: क) each gets the full supply voltage and can be switched independently
In parallel every appliance gets the same mains voltage, and one can be turned off without affecting the others.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A good fuse wire should have:
सही उत्तर: ग) a low melting point
When excess current flows, the fuse wire must heat up and melt quickly, breaking the circuit.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An object is placed 30 cm in front of a convex lens of focal length 15 cm. The image is formed:
सही उत्तर: क) 30 cm behind the lens, real, inverted and of the same size
The object is at 2f, so 1/v = 1/15 − 1/30 = 1/30 gives v = 30 cm; m = −1 (real, inverted, same size).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The warmth we feel when sitting near a fire is mainly due to:
सही उत्तर: ख) infrared radiation
Hot bodies emit most of their heat radiation in the infrared region.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Leaves look green because chlorophyll:
सही उत्तर: ग) absorbs mainly red and blue light and reflects green light
Chlorophyll absorbs strongly in the blue and red regions used for photosynthesis, and green light is largely reflected.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The least distance of distinct vision for a normal human eye is about:
सही उत्तर: घ) 25 cm
A normal eye sees nearby objects most clearly at about 25 cm (the near point); its far point is at infinity.
💬 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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