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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The gas that turns lime water milky is:
सही उत्तर: ख) Carbon dioxide
CO₂ reacts with lime water Ca(OH)₂ to form insoluble calcium carbonate, making it milky. Hydrogen is tested by a 'pop' sound with a burning splint.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The gas evolved when a metal like zinc reacts with dilute hydrochloric acid is:
सही उत्तर: क) Hydrogen
Zn + 2HCl → ZnCl₂ + H₂; active metals displace hydrogen from dilute acids. Carbon dioxide is released when acids react with carbonates.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The reaction between an acid and a base to form salt and water is called:
सही उत्तर: घ) Neutralization
Acid + base → salt + water is a neutralization reaction, for example HCl + NaOH → NaCl + H₂O. Antacids neutralize excess stomach acid this way.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Acids turn blue litmus paper:
सही उत्तर: ग) Red
Acids turn blue litmus red, while bases turn red litmus blue. Phenolphthalein stays colourless in acids and turns pink in bases.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A solution with pH less than 7 is:
सही उत्तर: ख) Acidic
On the pH scale, values below 7 are acidic, 7 is neutral and above 7 is basic. Pure water at 25 °C has pH 7.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The chemical name of quicklime is:
सही उत्तर: क) Calcium oxide
Quicklime is calcium oxide (CaO), made by heating limestone. Calcium hydroxide, Ca(OH)₂, is slaked lime.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following is an alkali metal?
सही उत्तर: ख) Potassium
Potassium is in group 1 with sodium and lithium, the alkali metals. Calcium and magnesium are alkaline earth metals in group 2.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The modern periodic table arranges elements in increasing order of their:
सही उत्तर: क) Atomic number
The modern periodic law states that properties of elements are periodic functions of their atomic numbers. Mendeleev's earlier table was based on atomic mass.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The elements of group 18 of the modern periodic table are called:
सही उत्तर: घ) Noble (inert) gases
Group 18 (helium, neon, argon, etc.) have stable outer electron shells and are very unreactive. Halogens are in group 17.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The maximum number of electrons that the second shell (L-shell) can hold is:
सही उत्तर: ग) 8
The maximum capacity of a shell is 2n²; for n = 2 this gives 8. The first (K) shell holds a maximum of 2 electrons.
💬 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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