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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The resistance of a metallic conductor ___ with increase in temperature.
सही उत्तर: ख) increases
Higher temperature increases lattice vibrations and collisions of electrons, so the resistivity of metals rises.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An electric dipole held at an angle to a uniform electric field experiences:
सही उत्तर: ख) a torque but no net force
The forces qE and −qE cancel, but they form a couple of torque pE sin θ.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A parallel-plate capacitor is charged and then disconnected from the battery. A dielectric slab of constant K is then inserted to fill the gap. The stored energy:
सही उत्तर: ख) becomes 1/K times
Charge Q stays constant while C becomes KC, so U = Q²/(2C) becomes 1/K times.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The work done in moving a charge between two points on an equipotential surface is:
सही उत्तर: ख) zero
W = q(V_B − V_A) and V_B = V_A on an equipotential surface, so W = 0.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The electric potential at a distance of 0.1 m from a point charge of 1 μC is (1/(4πε₀) = 9 × 10⁹ N m² C⁻²):
सही उत्तर: क) 9 × 10⁴ V
V = kq/r = 9 × 10⁹ × 10⁻⁶/0.1 = 9 × 10⁴ V.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two sources of light are said to be coherent when they:
सही उत्तर: ग) have a constant phase difference
Coherent sources maintain a constant phase difference (and the same frequency), which gives a stable interference pattern.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In Fraunhofer diffraction at a single slit of width a, the first minimum occurs at an angle θ given by:
सही उत्तर: ख) a sin θ = λ
Minima occur where a sin θ = nλ; the first minimum is at a sin θ = λ.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An astronomical telescope in normal adjustment has an objective of focal length 100 cm and an eyepiece of focal length 5 cm. Its magnifying power is:
सही उत्तर: क) 20
M = f_o/f_e = 100/5 = 20 (the tube length would be 105 cm).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Light is completely plane-polarised on reflection from glass of refractive index √3 when the angle of incidence is:
सही उत्तर: ग) 60°
Brewster's law: tan i_p = μ = √3, so i_p = 60°.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Total internal reflection can take place when light travels:
सही उत्तर: ग) from a denser to a rarer medium with angle of incidence greater than the critical angle
Both conditions are needed: denser to rarer medium, and incidence angle exceeding the critical angle.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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