त्रिवि IT प्रवेश BIT र BCA प्रवेश तयारी
त्रिवि IT प्रवेश – BIT र BCA प्रवेश
TU BIT & BCA Entrance · TU IT Entrance (B.Sc. CSIT, BIT, BCA)
२,६०५ प्रश्न उपलब्ध। मोड छान्नुहोस्:
IT 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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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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The splitting of white light into its constituent colours by a prism is called:
सही उत्तर: घ) Dispersion
Dispersion occurs because the refractive index of glass differs for different wavelengths. Diffraction is bending of light around obstacles and edges.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The focal length of a plane mirror is:
सही उत्तर: ग) Infinite
A plane mirror is a spherical mirror of infinite radius of curvature, so f = R/2 is infinite and its power is zero.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An object is placed 30 cm from a convex lens of focal length 20 cm. The image is formed at:
सही उत्तर: ख) 60 cm on the other side of the lens
Using 1/v − 1/u = 1/f with u = −30 cm: 1/v = 1/20 − 1/30 = 1/60, so v = +60 cm (real image). 12 cm comes from wrongly adding 1/20 and 1/30.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An object is placed 20 cm in front of a concave mirror of focal length 10 cm. The image is formed at a distance of:
सही उत्तर: क) 20 cm in front of the mirror
The object is at the centre of curvature (2f), so the image is also at C, 20 cm in front, real, inverted and same size. An object at the focus would give an image at infinity.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The speed of light in glass of refractive index 1.5 is:
सही उत्तर: ख) 2 × 10⁸ m/s
n = c/v, so v = c/n = (3 × 10⁸)/1.5 = 2 × 10⁸ m/s. Light slows down in a denser medium, so a value larger than c is impossible.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The mode of heat transfer that does not require any material medium is:
सही उत्तर: क) Radiation
Radiation travels as electromagnetic waves and can cross vacuum, which is how the Sun's heat reaches the Earth. Conduction and convection both need a medium.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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According to Wien's displacement law, as the temperature of a black body increases, the wavelength at which its emission is maximum:
सही उत्तर: घ) Decreases
Wien's law states λ_max × T = constant, so λ_max decreases as T rises. That is why very hot bodies glow bluish-white rather than red.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If the absolute temperature of a black body is doubled, the power it radiates becomes:
सही उत्तर: ग) 16 times
By the Stefan–Boltzmann law, E ∝ T⁴, so doubling T gives 2⁴ = 16 times the power. 4 times would be the case if E were proportional to T².
💬 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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