भौतिक विज्ञान (Physics) – Physics MCQ
भौतिक विज्ञान (Physics) – CEE प्रवेश
Physics · Medical Entrance (CEE) – Physics, Chemistry, Biology & MAT · ४०७ प्रश्न
४०७ प्रश्न उपलब्ध। मोड छान्नुहोस्:
भौतिक विज्ञान (Physics): 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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Which of the following substances is diamagnetic?
सही उत्तर: घ) Bismuth
Bismuth has a small negative magnetic susceptibility and is weakly repelled by a magnet. Aluminium is paramagnetic, while iron and nickel are ferromagnetic.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A galvanometer is converted into an ammeter by connecting:
सही उत्तर: ग) A low resistance in parallel
A small shunt in parallel carries most of the current, so the ammeter has low total resistance. A high resistance in series converts it into a voltmeter.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A charged particle enters a uniform magnetic field with its velocity perpendicular to the field. Its path is:
सही उत्तर: ख) A circle
The magnetic force qvB is always perpendicular to velocity and acts as the centripetal force, giving circular motion. A helix results when the velocity has a component along the field.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The magnetic field at the centre of a circular loop of radius R carrying current I is:
सही उत्तर: क) μ₀I/2R
From the Biot–Savart law, B at the centre of a circular loop is μ₀I/2R. μ₀I/2πR is the field near a long straight wire.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A cell of emf 12 V and internal resistance 1 Ω is connected to an external resistance of 5 Ω. The current in the circuit is:
सही उत्तर: घ) 2 A
I = E/(R + r) = 12/(5 + 1) = 2 A. 2.4 A ignores the internal resistance.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a balanced Wheatstone bridge, P = 10 Ω, Q = 20 Ω and R = 15 Ω. The value of S is:
सही उत्तर: ग) 30 Ω
At balance P/Q = R/S, so S = RQ/P = 15 × 20/10 = 30 Ω. 7.5 Ω results from inverting the ratio.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The resistance of the filament of a bulb rated 100 W, 220 V is:
सही उत्तर: ख) 484 Ω
R = V²/P = 220²/100 = 48400/100 = 484 Ω. 2.2 Ω results from dividing V by P.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Kirchhoff's junction (current) law is based on the conservation of:
सही उत्तर: क) Charge
The sum of currents entering a junction equals the sum leaving because charge cannot accumulate there. The loop (voltage) law is based on conservation of energy.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A wire of resistance R is stretched uniformly to twice its original length. Its new resistance is:
सही उत्तर: घ) 4R
Volume is constant, so doubling the length halves the area; R = ρL/A becomes ρ(2L)/(A/2) = 4R. 2R ignores the decrease in area.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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According to Gauss's law, the total electric flux through a closed surface enclosing a charge q (in vacuum) is:
सही उत्तर: ग) q/ε₀
Gauss's law states φ = q_enclosed/ε₀, independent of the shape of the surface. The flux is zero only when the net enclosed charge is zero.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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