भौतिक विज्ञान (Physics) – Physics MCQ
भौतिक विज्ञान (Physics) – इन्जिनियरिङ प्रवेश
Physics · Engineering Entrance – Mathematics, Physics, Chemistry & English · १,३९८ प्रश्न
१,३९८ 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 uniform wire of resistance R is bent into the shape of a square. The resistance between two adjacent corners is:
सही उत्तर: ख) 3R/16
Each side is R/4; between adjacent corners R/4 is in parallel with 3R/4, giving (R/4)(3R/4)/R = 3R/16.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A wire of resistance 10 Ω is cut into 5 equal parts, and the parts are connected in parallel. The equivalent resistance is:
सही उत्तर: घ) 0.4 Ω
Each part is 2 Ω; five of them in parallel give 2/5 = 0.4 Ω.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Four equal point charges q are placed at the four corners of a square. The electric field at the centre of the square is:
सही उत्तर: ख) zero
The fields due to charges at opposite corners are equal and opposite, so they cancel in pairs at the centre.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An electric dipole of moment p is in a uniform electric field E, initially aligned along the field. The work needed to rotate it through 180° is:
सही उत्तर: ख) 2pE
W = pE(cos 0° − cos 180°) = 2pE.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The energy stored per unit volume in an electric field E in vacuum is:
सही उत्तर: क) ½ε₀E²
Energy density of an electric field u = ½ε₀E².
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The electrostatic potential energy of a system of charges +1 μC and −1 μC placed 1 m apart in vacuum is (1/(4πε₀) = 9 × 10⁹ N m² C⁻²):
सही उत्तर: घ) −9 × 10⁻³ J
U = kq₁q₂/r = 9 × 10⁹ × (10⁻⁶)(−10⁻⁶)/1 = −9 × 10⁻³ J.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following values of electric charge can NOT exist on a body? (e = 1.6 × 10⁻¹⁹ C)
सही उत्तर: ख) 2.4 × 10⁻¹⁹ C
Charge is quantised (q = ne); 2.4 × 10⁻¹⁹ C would be 1.5e, which is not an integral multiple of e.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In single-slit Fraunhofer diffraction, the central maximum is:
सही उत्तर: क) twice as wide as each secondary maximum
The central maximum extends between the first minima on either side (angular width 2λ/a), twice that of the secondary maxima (λ/a).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In an interference experiment the amplitudes of the two interfering waves are in the ratio 2 : 1. The ratio of the maximum to the minimum intensity in the pattern is:
सही उत्तर: क) 9 : 1
I_max : I_min = (a₁ + a₂)² : (a₁ − a₂)² = 9 : 1.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Astigmatism of the human eye is corrected by using:
सही उत्तर: क) cylindrical lenses
Astigmatism arises from unequal curvature of the cornea in different planes and is corrected with cylindrical lenses.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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