भौतिक विज्ञान – Physics MCQ
भौतिक विज्ञान – IT प्रवेश
Physics · IT Entrance – B.Sc. CSIT, BIT & BCA · ३९९ प्रश्न
३९९ 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 5 kg block is pulled along a horizontal floor at constant velocity by a horizontal force of 15 N. The coefficient of kinetic friction is (g = 10 m/s²):
सही उत्तर: ख) 0.3
At constant velocity, friction = applied force: μ × 50 = 15, so μ = 0.3.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
A body falls freely from rest through 20 m. Its speed just before hitting the ground is (g = 10 m/s²):
सही उत्तर: ग) 20 m/s
v = √(2gh) = √(2 × 10 × 20) = 20 m/s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
A stone is dropped from rest from a height of 45 m. The time it takes to reach the ground is (g = 10 m/s²):
सही उत्तर: ख) 3 s
h = ½gt² gives 45 = 5t², so t = 3 s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
A car's speed increases uniformly from 10 m/s to 30 m/s in 5 s. Its acceleration is:
सही उत्तर: ग) 4 m/s²
a = (v − u)/t = (30 − 10)/5 = 4 m/s².
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
One light year is approximately equal to:
सही उत्तर: ख) 9.46 × 10¹⁵ m
A light year is the distance light travels in one year: 3 × 10⁸ m/s × 3.15 × 10⁷ s ≈ 9.46 × 10¹⁵ m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
The SI unit of impulse is:
सही उत्तर: घ) N s
Impulse = force × time, so its SI unit is newton second (N s), which equals kg m/s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
In the photoelectric effect, the maximum kinetic energy of emitted photoelectrons depends on the:
सही उत्तर: ख) Frequency of the incident light
By Einstein's equation KE_max = hν − φ, it depends on frequency and the work function. Intensity only changes the number of photoelectrons, i.e. the photocurrent.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
The rms value of an alternating voltage whose peak value is 100√2 V is:
सही उत्तर: ग) 100 V
V_rms = V₀/√2 = 100√2/√2 = 100 V. 70.7 V would be the rms value for a peak of 100 V.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
A step-up 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: ख) 1100 V
Vs/Vp = Ns/Np, so Vs = 220 × 500/100 = 1100 V. 44 V would result from using the inverse ratio as in a step-down transformer.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
-
Lenz's law gives the:
सही उत्तर: घ) Direction of the induced current
Lenz's law states that the induced current flows in a direction that opposes the change producing it. The magnitude of induced emf is given by Faraday's law.
💬 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।