CBSE Class 12 Physics 2026: Electrostatics + Current Electricity (Top 20 Most Expected Q &A with Solutions)

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 CBSE Class 12 Physics के Electrostatics और Current Electricity के सबसे महत्वपूर्ण 20 सवाल–जवाब, formulas, derivations और numericals के साथ। Q1) Coulomb’s Law लिखिए और SI unit बताइए। Solution: F = 1 4 π ε 0 q 1 q 2 r 2 F=\frac{1}{4\pi\varepsilon_0}\frac{q_1q_2}{r^2} F = 4 π ε 0 ​ 1 ​ r 2 q 1 ​ q 2 ​ ​ F F F की unit: Newton (N) ε 0 \varepsilon_0 ε 0 ​ : permittivity of free space Force line joining charges के along होता है। Q2) Point charge के कारण Electric Field का सूत्र (vector form)। Solution: E ⃗ = 1 4 π ε 0 q r 2 r ^ \vec E=\frac{1}{4\pi\varepsilon_0}\frac{q}{r^2}\hat r E = 4 π ε 0 ​ 1 ​ r 2 q ​ r ^ दिशा: + q +q + q से बाहर, − q -q − q की तरफ। Q3) Electric Flux की परिभाषा और unit। Solution: Φ E = E ⃗ ⋅ A ⃗ = E A cos ⁡ θ \Phi_E=\vec E\cdot \vec A = EA\cos\theta Φ E ​ = E ⋅ A = E A cos θ Unit: N   m 2 / C N\,m^2/C N m 2 / C Q4) Gauss Law लिखिए। Solution: ∮ E ⃗ ⋅ d A ⃗ = Q e n c ε 0 \oint \vec E\cdot d\vec A=\frac{Q_{enc}}{\varepsilon_0} ∮ E ⋅ d A...
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CBSE 2026 Biology: Most Important Short Questions (With Answers)

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CBSE 2026 ke liye Biology ke most important short questions yahan diye gaye hain. Ye questions quick revision, viva, unit test aur board preparation ke liye helpful hain. Neeche questions ke saath short answer key bhi di gayi hai. Is post ko daily 20–30 minutes revise karke aap scoring improve kar sakte ho.

  • Cell theory kya hai?

  • Prokaryotic aur eukaryotic cell me 2 differences.

  • Plasma membrane ka main function kya hai?

  • Diffusion aur osmosis me difference.

  • Mitochondria ko “powerhouse” kyu kehte hain?

  • Ribosome ka function kya hai?

  • Photosynthesis ka overall equation likho.

  • Chlorophyll ka role kya hai?

  • Respiration aur breathing me difference.

  • Enzyme kya hota hai?

  • DNA aur RNA me 2 differences.

  • Gene kya hota hai?

  • Mitosis ka importance (2 points).

  • Meiosis kyu important hai?

  • Mutation kya hota hai?

  • Vaccine kya hota hai?

  • Innate aur adaptive immunity me difference.

  • Antibiotics kya hote hain?

  • Food chain aur food web me difference.

  • Decomposers ka role ecosystem me kya hai?























































  • Cell theory: organisms cells se bane hote hain; cell basic unit of life.

  • Prokaryotic: true nucleus nahi; Eukaryotic: true nucleus hota hai (etc.).

  • Selective permeability + protection + transport control.

  • Diffusion: particles move high→low; Osmosis: water movement through semipermeable membrane.

  • ATP produce karta hai.

  • Protein synthesis.

  • CO₂ + H₂O → Glucose + O₂ (sunlight & chlorophyll).

  • Light energy absorb karke photosynthesis me help.

  • Respiration: energy release; breathing: air in/out.

  • Biological catalyst.

  • DNA: deoxyribose, thymine; RNA: ribose, uracil.

  • Hereditary unit (DNA segment).

  • Growth + repair + identical cells.

  • Gamete formation + chromosome number half.

  • Genetic material me sudden change.

  • Vaccine se immunity develop hoti hai.

  • Innate: birth se; Adaptive: exposure/vaccine se develop.

  • Bacteria ko kill/inhibit karne wali medicines.

  • Chain: single path; web: multiple paths.

  • Dead matter ko nutrients me break karte hain


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    CBSE Class 12 Physics 2026: Electrostatics + Current Electricity (Top 20 Most Expected Q &A with Solutions)

    -
     CBSE Class 12 Physics के Electrostatics और Current Electricity के सबसे महत्वपूर्ण 20 सवाल–जवाब, formulas, derivations और numericals के साथ। Q1) Coulomb’s Law लिखिए और SI unit बताइए। Solution: F = 1 4 π ε 0 q 1 q 2 r 2 F=\frac{1}{4\pi\varepsilon_0}\frac{q_1q_2}{r^2} F = 4 π ε 0 ​ 1 ​ r 2 q 1 ​ q 2 ​ ​ F F F की unit: Newton (N) ε 0 \varepsilon_0 ε 0 ​ : permittivity of free space Force line joining charges के along होता है। Q2) Point charge के कारण Electric Field का सूत्र (vector form)। Solution: E ⃗ = 1 4 π ε 0 q r 2 r ^ \vec E=\frac{1}{4\pi\varepsilon_0}\frac{q}{r^2}\hat r E = 4 π ε 0 ​ 1 ​ r 2 q ​ r ^ दिशा: + q +q + q से बाहर, − q -q − q की तरफ। Q3) Electric Flux की परिभाषा और unit। Solution: Φ E = E ⃗ ⋅ A ⃗ = E A cos ⁡ θ \Phi_E=\vec E\cdot \vec A = EA\cos\theta Φ E ​ = E ⋅ A = E A cos θ Unit: N   m 2 / C N\,m^2/C N m 2 / C Q4) Gauss Law लिखिए। Solution: ∮ E ⃗ ⋅ d A ⃗ = Q e n c ε 0 \oint \vec E\cdot d\vec A=\frac{Q_{enc}}{\varepsilon_0} ∮ E ⋅ d A...
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    CBSE 2026 Class 11 Physics: Questions (With Answers)

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