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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A wire of resistance R is stretched uniformly until its radius becomes half of the original. Its new resistance is:
सही उत्तर: क) 16R
Volume constant: radius halved means area becomes 1/4 and length 4 times; R ∝ L/A becomes 4 × 4 = 16 times.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A galvanometer of resistance 50 Ω gives full-scale deflection for a current of 1 mA. To convert it into a voltmeter of range 0–10 V, the resistance needed in series is:
सही उत्तर: घ) 9950 Ω
R = V/I_g − G = 10/10⁻³ − 50 = 10000 − 50 = 9950 Ω.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A cell drives a current of 0.9 A through a 2 Ω resistor and 0.3 A through a 7 Ω resistor. The internal resistance of the cell is:
सही उत्तर: घ) 0.5 Ω
E = 0.9(2 + r) = 0.3(7 + r) gives 1.8 + 0.9r = 2.1 + 0.3r, so 0.6r = 0.3 and r = 0.5 Ω (E = 2.25 V).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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n identical cells, each of emf E, are connected in series, but one of them is connected with its terminals reversed. The net emf of the battery is:
सही उत्तर: ग) (n − 2)E
The reversed cell does not add E but subtracts E, so net emf = (n − 1)E − E = (n − 2)E.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A battery of emf 12 V and internal resistance 0.5 Ω has its terminals accidentally joined by a thick copper wire of negligible resistance. The current that flows is:
सही उत्तर: ख) 24 A
On short circuit the only resistance is the internal resistance, so I = E/r = 12/0.5 = 24 A.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 2 μF capacitor charged to 100 V is connected across an uncharged 3 μF capacitor. The energy lost in the process is:
सही उत्तर: ख) 6 mJ
Energy lost = ½ (C₁C₂/(C₁ + C₂)) V² = ½ × 1.2 × 10⁻⁶ × 100² = 6 × 10⁻³ J = 6 mJ (initial 10 mJ, final 4 mJ).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The work done in moving a charge of 2 μC between two points having a potential difference of 50 V is:
सही उत्तर: क) 1 × 10⁻⁴ J
W = qV = 2 × 10⁻⁶ × 50 = 1 × 10⁻⁴ J.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The electric potential at a distance of 9 cm from a point charge of 1 μC in air is (1/4πε₀ = 9 × 10⁹ N m² C⁻²):
सही उत्तर: ग) 1 × 10⁵ V
V = kq/r = 9 × 10⁹ × 10⁻⁶/0.09 = 1 × 10⁵ V.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Light of wavelength 500 nm falls normally on a single slit of width 0.1 mm. The width of the central maximum on a screen 1 m away is:
सही उत्तर: क) 10 mm
Width of central maximum = 2λD/a = 2 × 500 × 10⁻⁹ × 1/10⁻⁴ = 10⁻² m = 10 mm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In Young's double-slit experiment, the path difference between the two waves at the third dark fringe from the centre is:
सही उत्तर: क) 5λ/2
Dark fringes occur at path difference (2n − 1)λ/2; for n = 3 it is 5λ/2.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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