विज्ञान – Science MCQ
विज्ञान – डिप्लोमा प्रवेश
Science · CTEVT Diploma Engineering Entrance · ३९५ प्रश्न
३९५ प्रश्न उपलब्ध। मोड छान्नुहोस्:
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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Which mirror is used as a rear-view mirror in vehicles?
सही उत्तर: घ) Convex mirror
A convex mirror always forms a small, erect, virtual image and gives a wide field of view. Concave mirrors are used in torches and as shaving mirrors.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The image formed by a plane mirror is:
सही उत्तर: ग) Virtual and erect
A plane mirror forms a virtual, erect image of the same size, as far behind the mirror as the object is in front. It is also laterally inverted (left-right reversed).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A concave lens is also known as a:
सही उत्तर: क) Diverging lens
A concave lens spreads parallel rays outward, so it is diverging. A convex lens converges rays and is called a converging lens.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The splitting of white light into seven colours by a prism is called:
सही उत्तर: घ) Dispersion
Different colours have different refractive indices in glass and bend by different amounts, producing a spectrum. Violet deviates the most and red the least.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The bending of light when it passes from one medium to another is called:
सही उत्तर: ग) Refraction
Refraction occurs because light changes speed in different media. Reflection is the bouncing back of light from a surface.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Sound of frequency above 20,000 Hz is called:
सही उत्तर: ख) Ultrasonic sound
Humans hear roughly 20 Hz to 20,000 Hz; above this range is ultrasound. 'Supersonic' refers to speed greater than the speed of sound, not frequency.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The amount of heat required to raise the temperature of 1 kg of a substance by 1 °C (or 1 K) is called its:
सही उत्तर: ख) Specific heat capacity
Specific heat capacity is measured in J/(kg K); for water it is about 4200 J/(kg K). Latent heat is absorbed during change of state without any rise in temperature.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The transfer of heat in a vacuum takes place by:
सही उत्तर: क) Radiation
Radiation needs no material medium, which is how heat from the Sun reaches the Earth. Conduction and convection both require a medium.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The SI unit of temperature is:
सही उत्तर: ग) Kelvin
The kelvin (K) is the SI base unit of temperature; T(K) = T(°C) + 273. The calorie is an old unit of heat energy.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Heat flows from one body to another due to a difference in:
सही उत्तर: ख) Temperature
Heat always flows from a body at higher temperature to one at lower temperature until both reach the same temperature. A large mass at low temperature does not give heat to a small hot body.
💬 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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