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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Atoms of the same element having the same atomic number but different mass numbers are called:
सही उत्तर: ख) Isotopes
Isotopes, such as protium, deuterium and tritium of hydrogen, differ in the number of neutrons. Isobars have the same mass number but different atomic numbers.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The atomic number of an element is equal to the number of:
सही उत्तर: क) Protons in its nucleus
Atomic number (Z) = number of protons, which also equals the number of electrons in a neutral atom. Protons plus neutrons gives the mass number.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The negatively charged particle of an atom is the:
सही उत्तर: घ) Electron
Electrons carry negative charge and revolve around the nucleus. Protons are positive and neutrons carry no charge.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The smallest particle of an element that can take part in a chemical reaction is called:
सही उत्तर: ग) Atom
An atom is the smallest particle of an element that can take part in a chemical reaction. A molecule is the smallest particle that can exist independently.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The safety device that breaks a circuit when excess current flows is a:
सही उत्तर: ख) Fuse
A fuse wire has a low melting point and melts when excessive current flows, breaking the circuit. A switch only opens or closes a circuit manually.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A step-up transformer:
सही उत्तर: क) Increases voltage
A step-up transformer has more turns in the secondary coil, so it increases voltage (and reduces current). It cannot increase power; ideally power stays the same.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A transformer works on the principle of:
सही उत्तर: घ) Electromagnetic induction
A changing current in the primary coil produces a changing magnetic flux that induces an emf in the secondary coil. That is why a transformer works only on AC, not steady DC.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The device that converts mechanical energy into electrical energy is:
सही उत्तर: ग) Generator (dynamo)
A generator works on electromagnetic induction to convert mechanical energy into electrical energy. An electric motor does the opposite.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The commercial unit of electrical energy is:
सही उत्तर: ख) Kilowatt-hour
One kilowatt-hour (1 unit) is the energy used by a 1 kW appliance in one hour and equals 3.6 × 10⁶ J. The kilowatt is a unit of power, not energy.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Ohm's law states that, at constant temperature, current through a conductor is:
सही उत्तर: क) Directly proportional to the potential difference
Ohm's law: V = IR, so I ∝ V when temperature and other physical conditions stay constant. Resistance is the constant of proportionality.
💬 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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