चिकित्सा शिक्षा आयोग (CEE) बीएस्सी नर्सिङ र बीएनएस प्रवेश तयारी
चिकित्सा शिक्षा आयोग (CEE) – बीएस्सी नर्सिङ र बीएनएस प्रवेश
B.Sc. Nursing & BNS Entrance · Medical Education Commission – CEE
२,०३९ प्रश्न उपलब्ध। मोड छान्नुहोस्:
MBBS/BDS/Nursing प्रवेश: 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 polarizing (Brewster) angle for a transparent medium of refractive index √3 is:
सही उत्तर: ख) 60°
Brewster's law: tan θp = n = √3, so θp = 60°. At this angle the reflected and refracted rays are perpendicular to each other.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The phenomenon that proves light is a transverse wave is:
सही उत्तर: क) Polarization
Only transverse waves can be polarized, because their vibrations have a direction perpendicular to propagation. Interference and diffraction occur for longitudinal waves such as sound as well.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In Young's double-slit experiment, λ = 600 nm, slit separation = 1 mm and screen distance = 1 m. The fringe width is:
सही उत्तर: घ) 0.6 mm
β = λD/d = (600 × 10⁻⁹ × 1)/(1 × 10⁻³) = 6 × 10⁻⁴ m = 0.6 mm. Errors in converting nm to m usually give 6 mm or 0.06 mm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Myopia (short-sightedness) is corrected by using a:
सही उत्तर: ग) Concave lens
In myopia the image forms in front of the retina; a diverging (concave) lens moves it back onto the retina. Convex lenses correct hypermetropia.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The blue colour of the clear sky is due to:
सही उत्तर: ख) Scattering of light
Air molecules scatter shorter wavelengths much more strongly (Rayleigh scattering, ∝ 1/λ⁴), so blue light reaches the eye from all directions. Dispersion explains the rainbow, not the sky's colour.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A convex lens of focal length 25 cm is placed in contact with a concave lens of focal length 50 cm. The power of the combination is:
सही उत्तर: क) +2 D
P = 100/25 + 100/(−50) = +4 − 2 = +2 D. +6 D results from adding the powers without the negative sign of the concave lens.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An object is placed 30 cm in front of a concave mirror of focal length 10 cm. The image is formed at:
सही उत्तर: घ) 15 cm in front of the mirror
Using 1/v + 1/u = 1/f with u = −30 cm, f = −10 cm gives v = −15 cm, a real image in front of the mirror. The image lies between F and C because the object is beyond C.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The critical angle for a medium of refractive index √2 (with respect to air) is:
सही उत्तर: ग) 45°
sin C = 1/n = 1/√2, so C = 45°. Total internal reflection occurs for angles of incidence greater than this, going from denser to rarer medium.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The speed of light in a glass is 2 × 10⁸ m/s. The refractive index of the glass is (c = 3 × 10⁸ m/s):
सही उत्तर: ख) 1.5
n = c/v = 3 × 10⁸/(2 × 10⁸) = 1.5. 0.67 is v/c, which is inverted.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When a source of sound moves towards a stationary listener, the apparent frequency heard is:
सही उत्तर: क) Higher than the actual frequency
Waves get compressed ahead of an approaching source, so the observed frequency increases (Doppler effect). It decreases when the source moves away.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
यी अभ्यास प्रश्न हुन्, आधिकारिक प्रश्न होइनन्। पाठ्यक्रम, विज्ञापन र नतिजाका लागि सम्बन्धित निकायको आधिकारिक वेबसाइट हेर्नुहोस्। उत्तरमा गल्ती भेटे प्रश्नमुनिको "टिप्पणी / गल्ती रिपोर्ट" मा लेख्नुहोस्।
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