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
-
A capacitor of 10 µF is charged to 100 V. The energy stored in it is:
सही उत्तर: ख) 0.05 J
U = ½CV² = ½ × 10 × 10⁻⁶ × 10⁴ = 0.05 J. 0.1 J results from omitting the factor ½.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
Two capacitors of 2 µF and 3 µF are connected in series. The equivalent capacitance is:
सही उत्तर: क) 1.2 µF
For series, 1/C = 1/2 + 1/3 = 5/6, so C = 1.2 µF. 5 µF is the parallel combination.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
The electric field inside a charged hollow conductor (in electrostatic equilibrium) is:
सही उत्तर: घ) Zero
Charges reside on the outer surface and the field inside a conductor is zero; this is the basis of electrostatic shielding. The potential inside, however, is constant and equal to the surface potential.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
If the distance between two point charges is doubled, the electrostatic force between them becomes:
सही उत्तर: ग) One-fourth
Coulomb's law gives F ∝ 1/r², so doubling r reduces F to 1/4. Half would follow from an incorrect 1/r dependence.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
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)
-
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)
-
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)
-
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)
-
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)
-
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)
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।
नमस्ते! पाठ्यक्रम, सामान्य ज्ञान, भाषा परीक्षा वा कुनै प्रश्नको उत्तर बुझ्न सोध्नुहोस्।
AI ले गल्ती गर्न सक्छ। महत्वपूर्ण कुरा आधिकारिक स्रोतमा जाँच्नुहोस्।