EVERYDAY SCIENCE
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
ایک ڈپلائیڈ خلیے کی میوسس کے بعد نتیجہ کیا ہوتا ہے؟
- Two diploid cells
- Four haploid cells
- One diploid cell
- None of these
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Explanation
- Meiosis is a special type of cell division in living organisms.
- It occurs in reproductive cells (germ cells).
- It reduces chromosome number from diploid (2n) to haploid (n).
- It produces genetically different cells.
- Final result is formation of gametes.
Last verified on 20-05-2026
- 3:1
- 1:2:1
- 2:1:1
- None of these
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Explanation
- A cross between two heterozygous individuals (Aa × Aa) is a monohybrid cross.
- Each parent produces two types of gametes: A and a.
- Offspring combinations are AA, Aa, Aa, and aa.
- This gives a characteristic Mendelian ratio in genotype.
- It follows simple inheritance laws proposed by Mendel.
Last verified on 20-05-2026
مینڈل کا آزادانہ درجہ بندی کا قانون کب لاگو ہوتا ہے؟
- On same chromosome and close together
- On different chromosomes or far apart on the same chromosome
- Always linked genes
- None of these
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Explanation
- Mendel’s law of independent assortment explains how traits are inherited independently.
- It works during gamete formation (meiosis).
- Genes are inherited independently if they are not physically linked.
- This usually happens when genes are on different chromosomes.
- It can also apply when genes are far apart on the same chromosome (due to crossing over).
Last verified on 20-05-2026
کاپر کے مرکبات کا نیلا رنگ کس وجہ سے ہوتا ہے؟
- Metallic bonding
- Charge transfer
- d–d transition
- None of these
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Explanation
- Transition metal compounds show color due to electronic transitions.
- In copper compounds (especially Cu²⁺), d-orbitals are partially filled.
- Electrons absorb specific wavelengths of light and get excited between d-orbitals.
- The remaining reflected/transmitted light appears blue.
- This phenomenon is called d–d transition.
Last verified on 20-05-2026
- Secondary alkyl halide
- Primary alkyl halide
- Methyl bromide
- None of these
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Explanation
- SN2 reaction occurs in one step via backside attack.
- Steric hindrance strongly affects reaction rate.
- Less crowded substrates allow easier nucleophilic attack.
- Methyl halides have no alkyl groups blocking the carbon center.
- So they react the fastest in SN2 mechanism.
Last verified on 20-05-2026
ہیس کے قانون کے مطابق اینتھالپی کیوں حساب کی جا سکتی ہے؟
- State function
- Path function
- Intensive property
- None of these
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Explanation
- Hess’s law states that total enthalpy change is independent of path.
- It depends only on initial and final states of a reaction.
- This is possible because enthalpy does not depend on the route taken.
- Such properties are called state functions.
- Therefore, enthalpy follows path independence.
Last verified on 20-05-2026
پروپین کی اوزونولائسز سے کون سی مصنوعات بنتی ہیں؟
- Ethanol and methanol
- Ethanal and methanal
- Ethanoic acid and methanoic acid
- None of these
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Explanation
- Ozonolysis breaks the double bond of alkenes using ozone (O₃).
- Propene has structure: CH₃–CH=CH₂.
- Double bond cleavage forms two carbonyl compounds.
- One side gives ethanal (CH₃CHO) and the other gives methanal (HCHO).
- Therefore, these are the final products after ozonolysis.
Last verified on 20-05-2026
الکائل بینزین کو بینزوئک ایسڈ میں تبدیل کرنے کے لیے کیا استعمال ہوتا ہے؟
- NaOH
- KMnO₄, acidified
- H₂/Ni
- None of these
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Explanation
- Alkyl benzene undergoes side-chain oxidation to form benzoic acid.
- A strong oxidizing agent is required for this conversion.
- Potassium permanganate (KMnO₄) in acidic medium is commonly used.
- It converts the alkyl side chain completely into –COOH group.
- Example: Toluene → Benzoic acid.
Last verified on 20-05-2026
گیبریل فثالیمائڈ سنتھیسس کس کے لیے استعمال ہوتا ہے؟
- 1° amine
- 2° amine
- 3° amine
- None of these
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Explanation
- Gabriel phthalimide synthesis is a method to prepare amines.
- It involves alkylation of phthalimide followed by hydrolysis.
- This method specifically gives only primary amines.
- It avoids formation of secondary and tertiary amines.
- Therefore, it is a selective and controlled preparation method.
Last verified on 20-05-2026
- r = [A]¹[B]²
- r = [A]²[B]¹
- r = [A]²[B]⁰
- None of these
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Explanation
- Rate law shows how reaction rate depends on reactant concentrations.
- If rate does NOT change when B changes, then B has no effect on rate.
- This means the order of reaction with respect to B is zero.
- So B appears with exponent 0 in the rate law.
- Therefore, rate depends only on A.
Last verified on 20-05-2026
