भौतिक विज्ञान – Physics MCQ
भौतिक विज्ञान – IT प्रवेश
Physics · IT Entrance – B.Sc. CSIT, BIT & BCA · ३९९ प्रश्न
३९९ 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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A meter bridge works on the principle of:
सही उत्तर: क) Wheatstone bridge
A meter bridge is a practical form of the Wheatstone bridge, using the balance condition P/Q = R/S to find an unknown resistance. A potentiometer is a different instrument based on potential drop along a wire.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The resistance of the filament of a bulb rated 220 V, 100 W is:
सही उत्तर: घ) 484 Ω
R = V²/P = 220²/100 = 48,400/100 = 484 Ω. Using V/P gives the meaningless value 2.2.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Three resistors of 2 Ω, 3 Ω and 6 Ω are connected in parallel. The equivalent resistance is:
सही उत्तर: क) 1 Ω
1/R = 1/2 + 1/3 + 1/6 = 1, so R = 1 Ω. 11 Ω would be their series combination.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The SI unit of electric field intensity is:
सही उत्तर: ग) N/C
Electric field E = F/q, so its unit is newton per coulomb (N/C), which is equivalent to volt per metre (V/m), not V·m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The energy stored in a 2 μF capacitor charged to 100 V is:
सही उत्तर: ख) 0.01 J
U = ½CV² = 0.5 × 2 × 10⁻⁶ × 100² = 0.01 J. Forgetting the factor ½ gives 0.02 J.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two capacitors of 2 μF and 3 μF are connected in series. Their equivalent capacitance is:
सही उत्तर: क) 1.2 μF
For series combination 1/C = 1/2 + 1/3 = 5/6, so C = 6/5 = 1.2 μF. 5 μF would be the parallel combination.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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According to Brewster's law, the polarizing angle θp and refractive index n are related by:
सही उत्तर: क) tan θp = n
Brewster's law is n = tan θp; at this angle the reflected and refracted rays are perpendicular. sin C = 1/n is instead the relation for the critical angle.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The phenomenon that shows light waves are transverse in nature is:
सही उत्तर: घ) Polarization
Only transverse waves can be polarized, so polarization proves that light is transverse. Interference and diffraction show wave nature but occur for longitudinal waves (such as sound) too.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In Young's double-slit experiment, λ = 600 nm, slit separation d = 1 mm and screen distance D = 1 m. The fringe width is:
सही उत्तर: ग) 0.6 mm
β = λD/d = (600 × 10⁻⁹ × 1)/(1 × 10⁻³) = 6 × 10⁻⁴ m = 0.6 mm. A unit slip with nanometres commonly gives 6 mm or 0.06 mm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When white light passes through a glass prism, the colour that is deviated the most is:
सही उत्तर: क) Violet
Violet light has the shortest wavelength and the highest refractive index in glass, so it bends the most. Red is deviated the least.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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