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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In Young's double-slit experiment, the separation between the slits is doubled and the distance of the screen from the slits is halved. The fringe width becomes:
सही उत्तर: ख) one-fourth
β = λD/d; D halved and d doubled make β = (1/2)/2 = 1/4 of its original value.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An object is placed 30 cm in front of a convex lens of focal length 10 cm. The magnification of the image is:
सही उत्तर: ग) −0.5
1/v − 1/u = 1/f with u = −30 cm gives v = +15 cm; m = v/u = 15/(−30) = −0.5 (real, inverted, diminished).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A coin lies at the bottom of a beaker filled with water (μ = 4/3) to a depth of 20 cm. Viewed from above, the coin appears to be raised by:
सही उत्तर: घ) 5 cm
Apparent depth = 20/(4/3) = 15 cm, so the coin appears raised by 20 − 15 = 5 cm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The refractive indices of a glass for violet, red and mean (yellow) light are 1.66, 1.64 and 1.65 respectively. The dispersive power of the glass is about:
सही उत्तर: क) 0.031
ω = (μᵥ − μᵣ)/(μ − 1) = (1.66 − 1.64)/(1.65 − 1) = 0.02/0.65 ≈ 0.031.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a compound microscope, the intermediate image formed by the objective lens is:
सही उत्तर: ग) real, inverted and magnified
The object is placed just beyond the focus of the short-focus objective, so it forms a real, inverted and magnified image, which the eyepiece then magnifies further.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A thin prism of angle 5° is made of glass of refractive index 1.6. The deviation produced by it is:
सही उत्तर: ख) 3°
For a thin prism δ = (μ − 1)A = 0.6 × 5° = 3°.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A convex lens of focal length 20 cm is placed in contact with a concave lens of focal length 40 cm. The combination behaves as a:
सही उत्तर: घ) convex lens of focal length 40 cm
1/F = 1/20 − 1/40 = 1/40, so F = +40 cm (converging).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The time taken by light to pass normally through a glass slab 3 cm thick (refractive index 1.5) is (c = 3 × 10⁸ m/s):
सही उत्तर: क) 1.5 × 10⁻¹⁰ s
Speed in glass = c/μ = 2 × 10⁸ m/s; t = 0.03/(2 × 10⁸) = 1.5 × 10⁻¹⁰ s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A source of sound of frequency 500 Hz moves towards a stationary observer with a speed equal to one-fifth of the speed of sound. The frequency heard is:
सही उत्तर: क) 625 Hz
f′ = f × v/(v − v_s) = 500 × v/(v − v/5) = 500 × 5/4 = 625 Hz.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A pipe 0.5 m long is open at both ends. If the speed of sound is 340 m/s, the frequency of its second overtone is:
सही उत्तर: घ) 1020 Hz
For an open pipe all harmonics occur; the second overtone is the third harmonic, f = 3v/2L = 3 × 340/(2 × 0.5) = 1020 Hz.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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