भौतिक विज्ञान – Physics MCQ
भौतिक विज्ञान – कृषि/वन प्रवेश
Physics · Agriculture, Veterinary & Forestry Entrance · ४२५ प्रश्न
४२५ प्रश्न उपलब्ध। मोड छान्नुहोस्:
भौतिक विज्ञान: 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 runner goes halfway round a circular track of radius 7 m. The magnitude of the runner's displacement is:
सही उत्तर: ख) 14 m
Displacement is the straight line from start to finish, which is a diameter: 2 × 7 = 14 m (the distance covered is πr = 22 m).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
The scalar (dot) product of two perpendicular vectors is:
सही उत्तर: क) zero
A·B = AB cos 90° = 0.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
The most suitable instrument for measuring the diameter of a thin wire accurately is a:
सही उत्तर: ख) screw gauge
A screw gauge has a least count of about 0.01 mm, fine enough for wire diameters.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
Which of the following is a derived physical quantity?
सही उत्तर: क) Velocity
Velocity = displacement/time is derived from the base quantities length and time; length, mass and time are base quantities.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
A p-n junction diode is forward biased when:
सही उत्तर: ख) the p-side is connected to the positive terminal and the n-side to the negative terminal
Forward bias lowers the barrier potential so that current flows easily.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
In the photoelectric effect, the maximum kinetic energy of the emitted electrons depends on:
सही उत्तर: ग) the frequency of the incident light
KE_max = hf − φ; intensity only changes the number of electrons emitted.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
The inductive reactance of a coil:
सही उत्तर: घ) increases as the AC frequency increases
X_L = 2πfL, so it is directly proportional to frequency (and zero for DC).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
In a balanced Wheatstone bridge with resistances P, Q, R and S in the four arms, the condition is:
सही उत्तर: घ) P/Q = R/S
At balance no current flows through the galvanometer and P/Q = R/S.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
A cell of emf 12 V and internal resistance 1 Ω is connected to an external resistance of 5 Ω. The current in the circuit is:
सही उत्तर: घ) 2 A
I = E/(R + r) = 12/(5 + 1) = 2 A.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
A rainbow is formed due to:
सही उत्तर: क) refraction, dispersion and total internal reflection of sunlight in raindrops
Sunlight is refracted and dispersed on entering a drop, totally internally reflected inside, and refracted again on leaving.
💬 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।