इन्जिनियरिङ प्रवेश – Mathematics, Physics, Chemistry, English
इन्जिनियरिङ प्रवेश – Mathematics, Physics, Chemistry, English
Engineering Entrance – Mathematics, Physics, Chemistry & English · ३,८४१ प्रश्न
३,८४१ प्रश्न उपलब्ध। मोड छान्नुहोस्:
इन्जिनियरिङ 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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If n(A) = n(B) = n(C) = 10, n(A ∩ B) = n(B ∩ C) = n(C ∩ A) = 4 and n(A ∩ B ∩ C) = 2, then n(A ∪ B ∪ C) is:
सही उत्तर: ग) 20
n(A ∪ B ∪ C) = 30 − (4 + 4 + 4) + 2 = 20.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For any two sets A and B, the complement (A ∪ B)' equals:
सही उत्तर: घ) A' ∩ B'
By De Morgan's law, the complement of a union is the intersection of the complements: (A ∪ B)' = A' ∩ B'.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a group of 100 students, 60 study Physics, 50 study Chemistry and 20 study both. The number of students who study neither subject is:
सही उत्तर: ख) 10
n(P ∪ C) = 60 + 50 − 20 = 90, so the number studying neither = 100 − 90 = 10.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Chromatography separates the components of a mixture on the basis of their:
सही उत्तर: घ) different adsorption or partition between a stationary and a mobile phase
Components distribute differently between the stationary phase and the moving phase, so they travel at different rates and separate.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Aniline, which is immiscible with water and volatile in steam, is purified by:
सही उत्तर: ग) steam distillation
Steam distillation suits water-immiscible liquids that are steam-volatile; the mixture boils below 100 °C, avoiding decomposition.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Starch is a polymer of:
सही उत्तर: ख) α-D-glucose
Starch (amylose and amylopectin) consists of α-D-glucose units joined by glycosidic linkages; cellulose is made of β-D-glucose.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Bakelite is a thermosetting polymer obtained from:
सही उत्तर: क) phenol and formaldehyde
Bakelite is formed by condensation polymerisation of phenol with formaldehyde, forming a cross-linked network.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Gabriel phthalimide synthesis is used to prepare:
सही उत्तर: घ) pure primary aliphatic amines
Potassium phthalimide is alkylated and then hydrolysed to give only primary amines; aryl halides do not react, so aniline cannot be made this way.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The reduction of an acid chloride to an aldehyde with H₂ over palladium on barium sulphate is called the:
सही उत्तर: ग) Rosenmund reduction
In the Rosenmund reduction, BaSO₄ (often with sulphur or quinoline) poisons the Pd catalyst so the aldehyde is not reduced further.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Addition of HCN to an aldehyde or ketone gives a:
सही उत्तर: ख) cyanohydrin
CN⁻ adds to the carbonyl carbon (nucleophilic addition) and the oxygen is protonated, forming a cyanohydrin R₂C(OH)CN.
💬 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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