मेडिकल प्रवेश (CEE) – Physics, Chemistry, Zoology, Botany, MAT
मेडिकल प्रवेश (CEE) – Physics, Chemistry, Zoology, Botany, MAT
Medical Entrance (CEE) – Physics, Chemistry, Biology & MAT · २,०३९ प्रश्न
२,०३९ प्रश्न उपलब्ध। मोड छान्नुहोस्:
CEE 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
-
At resonance in a series LCR circuit, the impedance of the circuit is:
सही उत्तर: ख) Equal to R (minimum)
At resonance X_L = X_C, so Z = √(R² + (X_L − X_C)²) = R, its minimum value, and current is maximum. A parallel LC circuit, by contrast, has maximum impedance at resonance.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
In a purely inductive AC circuit, the current:
सही उत्तर: क) Lags the voltage by 90°
The back emf of the inductor delays the current by a quarter cycle (π/2). In a purely capacitive circuit the current leads the voltage by 90°.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
The rms value of the domestic AC supply is 220 V. Its peak value is approximately:
सही उत्तर: घ) 311 V
V₀ = √2 × V_rms = 1.414 × 220 ≈ 311 V. 156 V results from dividing by √2 instead of multiplying.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
A transformer has 100 turns in the primary and 500 turns in the secondary. If 220 V AC is applied to the primary, the secondary voltage is:
सही उत्तर: ग) 1100 V
For an ideal transformer Vs/Vp = Ns/Np, so Vs = 220 × 5 = 1100 V. 44 V would be obtained if the turns ratio were inverted, as in a step-down transformer.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
According to Faraday's law of electromagnetic induction, the induced emf in a circuit equals:
सही उत्तर: ख) The rate of change of magnetic flux linked with it
ε = −dφ/dt: a steady flux, however large, induces no emf. The negative sign expresses Lenz's law.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
Lenz's law is a consequence of the law of conservation of:
सही उत्तर: क) Energy
The induced current opposes the change producing it, so work must be done to sustain it; otherwise energy would be created. Kirchhoff's junction law, by contrast, comes from charge conservation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
Which of the following substances is diamagnetic?
सही उत्तर: घ) Bismuth
Bismuth has a small negative magnetic susceptibility and is weakly repelled by a magnet. Aluminium is paramagnetic, while iron and nickel are ferromagnetic.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
A galvanometer is converted into an ammeter by connecting:
सही उत्तर: ग) A low resistance in parallel
A small shunt in parallel carries most of the current, so the ammeter has low total resistance. A high resistance in series converts it into a voltmeter.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
A charged particle enters a uniform magnetic field with its velocity perpendicular to the field. Its path is:
सही उत्तर: ख) A circle
The magnetic force qvB is always perpendicular to velocity and acts as the centripetal force, giving circular motion. A helix results when the velocity has a component along the field.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
The magnetic field at the centre of a circular loop of radius R carrying current I is:
सही उत्तर: क) μ₀I/2R
From the Biot–Savart law, B at the centre of a circular loop is μ₀I/2R. μ₀I/2πR is the field near a long straight wire.
💬 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।