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 man of mass 60 kg stands in a lift accelerating upward at 2 m/s². Taking g = 10 m/s², his apparent weight is:
सही उत्तर: ग) 720 N
Apparent weight R = m(g + a) = 60 × 12 = 720 N. 480 N would be the reading if the lift accelerated downward.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A stone is dropped from the top of a 45 m high tower. Taking g = 10 m/s², the time taken to reach the ground is:
सही उत्तर: ग) 3 s
h = ½gt², so t = √(2h/g) = √(90/10) = 3 s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Food cooks faster in a pressure cooker because:
सही उत्तर: ख) The boiling point of water increases with pressure
Higher pressure raises water's boiling point above 100 °C, so food is cooked at a higher temperature. At high altitudes, lower pressure lowers the boiling point, making cooking slower.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a vernier calliper, 10 vernier scale divisions coincide with 9 main scale divisions, and 1 MSD = 1 mm. Its least count is:
सही उत्तर: ग) 0.1 mm
LC = 1 MSD − 1 VSD = 1 − 0.9 = 0.1 mm. 0.01 mm is the typical least count of a screw gauge.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The greenhouse effect is mainly due to the trapping of:
सही उत्तर: ख) Infrared radiation
Earth re-emits absorbed solar energy as infrared radiation, which gases like CO₂, methane and water vapour absorb, warming the lower atmosphere.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The ozone layer protects living organisms from harmful:
सही उत्तर: घ) Ultraviolet radiation
Stratospheric ozone absorbs most of the Sun's harmful UV rays, which can cause skin cancer and damage plants. Infrared is felt as heat.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the electromagnetic spectrum, which radiation has the longest wavelength?
सही उत्तर: ख) Radio waves
Radio waves have the longest wavelength and lowest frequency; gamma rays have the shortest wavelength.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The output of a two-input AND gate when the inputs are 1 and 0 is:
सही उत्तर: ख) 0
An AND gate gives output 1 only when all inputs are 1. With inputs 1 and 0, the output is 0 (an OR gate would give 1).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a p-type semiconductor, the majority charge carriers are:
सही उत्तर: घ) Holes
Trivalent impurities create holes, which are the majority carriers in p-type material; electrons are the minority carriers.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When pure silicon is doped with phosphorus (a pentavalent element), the semiconductor formed is:
सही उत्तर: ग) n-type
Phosphorus has 5 valence electrons; the extra electron becomes a free charge carrier, giving an n-type semiconductor. Trivalent dopants like boron give p-type.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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