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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Food cooks faster in a pressure cooker because:
सही उत्तर: ग) the increased pressure raises the boiling point of water
Inside the sealed cooker the pressure is higher, so water boils at about 120 °C and food cooks faster.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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At high altitudes such as in the Himalayan region, water boils at a temperature:
सही उत्तर: ग) below 100 °C because the air pressure is lower
The boiling point falls as the external pressure falls, so cooking takes longer at high altitude.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Water kept in an earthen pot (ghaito) stays cool in summer because of:
सही उत्तर: घ) evaporation of water through its pores
Water seeps through the pores and evaporates; evaporation takes latent heat from the remaining water, cooling it.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Water is used in hot-water bags because:
सही उत्तर: क) it has a high specific heat capacity
A high specific heat lets water store a lot of heat and release it slowly.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The rise of water through fine pores of the soil towards the surface is due to:
सही उत्तर: ख) capillary action
Soil pores act like fine capillary tubes, so water rises through them because of surface tension (capillarity).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A heavy iron ship floats on water because:
सही उत्तर: ग) it displaces water whose weight equals its own weight
By the law of flotation, its hollow shape displaces enough water for the upthrust to equal its weight.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A lactometer, used to test the purity of milk, works on the principle of:
सही उत्तर: ग) flotation (Archimedes' principle)
It floats deeper in a less dense liquid; its depth of floating indicates the density of the milk.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Hydraulic brakes of vehicles work on:
सही उत्तर: ख) Pascal's law
Pressure applied to an enclosed liquid is transmitted equally in all directions, so a small pedal force acts on all wheel cylinders.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The total (absolute) pressure at a depth of 5 m in fresh water is (atmospheric pressure = 1 × 10⁵ Pa, ρ = 1000 kg/m³, g = 10 m/s²):
सही उत्तर: ग) 1.5 × 10⁵ Pa
P = P₀ + ρgh = 1 × 10⁵ + 1000 × 10 × 5 = 1.5 × 10⁵ Pa.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A sharp knife cuts more easily than a blunt one because:
सही उत्तर: घ) the same force acts on a smaller area, giving greater pressure
Pressure = force/area; the thin edge has a tiny area, so the pressure is very large.
💬 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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