कृषि, पशु र वन विज्ञान B.Sc. Forestry प्रवेश तयारी
कृषि, पशु र वन विज्ञान – B.Sc. Forestry प्रवेश
B.Sc. Forestry Entrance · Agriculture, Veterinary & Forestry Entrance
२,४९३ प्रश्न उपलब्ध। मोड छान्नुहोस्:
कृषि, पशु र वन विज्ञान प्रवेश: 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 0.5 kg metal block at 100 °C is dropped into 1 kg of water at 20 °C. The final temperature is 25 °C. Taking the specific heat of water as 4200 J/kg K and ignoring losses, the specific heat of the metal is:
सही उत्तर: ख) 560 J/kg K
Heat lost by metal = heat gained by water: 0.5 × c × 75 = 1 × 4200 × 5 = 21,000, so c = 21,000/37.5 = 560 J/kg K.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Light-coloured clothes are preferred in summer because they:
सही उत्तर: घ) reflect most of the heat radiation falling on them
Dark surfaces are good absorbers of radiation, while light surfaces reflect most of it.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The heat needed to convert 2 kg of water at 100 °C completely into steam at 100 °C is (latent heat of vaporisation = 2.26 × 10⁶ J/kg):
सही उत्तर: ग) 4.52 × 10⁶ J
Q = mL = 2 × 2.26 × 10⁶ = 4.52 × 10⁶ J.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In metals, heat is conducted mainly by:
सही उत्तर: ग) free electrons
The free electrons in a metal carry energy quickly from hot to cold regions, which also explains why good electrical conductors are good heat conductors.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A glass greenhouse stays warm because the glass:
सही उत्तर: क) lets in short-wavelength sunlight but blocks the long-wavelength infrared emitted inside
Plants and soil absorb sunlight and re-emit infrared, which glass does not let out easily, so heat is trapped.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The instrument used to measure the relative humidity of air is a:
सही उत्तर: घ) hygrometer
A hygrometer (for example, a wet-and-dry bulb hygrometer) measures humidity; an anemometer measures wind speed.
💬 टिप्पणी / गल्ती रिपोर्ट (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)
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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