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
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A boy of mass 60 kg runs up a staircase of vertical height 10 m in 20 s. His power is (g = 10 m/s²):
सही उत्तर: क) 300 W
P = mgh/t = 60 × 10 × 10 / 20 = 300 W.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A machine does 300 J of useful work when 400 J of work is put into it. Its efficiency is:
सही उत्तर: ग) 75%
Efficiency = output/input × 100 = 300/400 × 100 = 75%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A car of mass 800 kg moving at 20 m/s is stopped by its brakes in a distance of 40 m. The average braking force is:
सही उत्तर: क) 4000 N
a = u²/2s = 400/80 = 5 m/s²; F = ma = 800 × 5 = 4000 N.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A constant force brings a 2 kg body moving at 10 m/s to rest in 4 s. The magnitude of the force is:
सही उत्तर: ख) 5 N
a = 10/4 = 2.5 m/s²; F = ma = 2 × 2.5 = 5 N (or F = Δp/t = 20/4 = 5 N).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A person has a mass of 60 kg on the Earth. If g on the Moon is one-sixth of that on the Earth (g = 9.8 m/s²), the person's weight on the Moon is:
सही उत्तर: घ) 98 N
W = m × g/6 = 60 × 9.8/6 = 98 N; the mass stays 60 kg.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A fielder pulls his hands back while catching a fast cricket ball in order to:
सही उत्तर: ग) increase the time of impact and so reduce the force on his hands
The change in momentum is fixed; spreading it over a longer time reduces the average force (F = Δp/Δt).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When a moving bus stops suddenly, the passengers fall forward. This is due to:
सही उत्तर: क) inertia of motion
The passengers' bodies tend to keep moving forward even after the bus stops (Newton's first law).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If the speed of a car is doubled, its minimum stopping distance for the same braking retardation becomes:
सही उत्तर: घ) 4 times
s = u²/2a, so s ∝ u²; doubling u makes s four times.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For a body thrown horizontally from a height (air resistance neglected), the horizontal component of its velocity:
सही उत्तर: ग) remains constant
No horizontal force acts on it, so the horizontal velocity stays the same; only the vertical velocity changes due to gravity.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In uniform circular motion, the acceleration of the body is directed:
सही उत्तर: घ) towards the centre of the circle
The centripetal acceleration v²/r always points towards the centre, perpendicular to the velocity.
💬 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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