⚠️ Auditor's Corrected Strategy: Yahan examiner tumhara "Memory Recall" aur "Dimensional Logic" test karta hai. Q1 (MCQ) me hamesha Compound Units aur Ratios puchte hain. Q2 (VSA) me aisi Definitions aati hain jinme ek specific 'Keyword' zaroori hota hai (jaise 'Minimum' ya 'Normal'). In 5 pools ko master kar lo, 12 me se 12 marks pakke.
Pool 1: Constants, Units & Dimensions (2-3 Marks Sure)
- Dimensions
Permittivity ($\epsilon_0$) aur Permeability ($\mu_0$) ki Unit aur Dimension.
$$ [\epsilon_0] = M^{-1}L^{-3}T^4 A^2 \quad ; \quad [\mu_0] = MLT^{-2}A^{-2} $$
- Compound Units
Velocity of light ka relation aur Impedance ki dimension.
$$ c = \frac{1}{\sqrt{\mu_0 \epsilon_0}} \quad ; \quad \text{Unit of } \sqrt{\frac{\mu_0}{\epsilon_0}} \text{ is Ohm } (\Omega) $$
- Trap Alert
$L/R$, $RC$, aur $\sqrt{LC}$ in teeno ki dimension Time $[T]$ hoti hai. MCQ me confuse karne ke liye inka ratio puchte hain.
Pool 2: AC, EMI & Current Electricity (2-3 Marks)
- Direct Formula
Specific Conductivity (विशिष्ट चालकता) ka unit ($\Omega^{-1}m^{-1}$ ya $S/m$).
RMS vs Peak values ka relation.
$$ V_{rms} = \frac{V_0}{\sqrt{2}} \quad ; \quad P = V_{rms} I_{rms} \cos\phi $$
- Keywords
Lenz's Law kis conservation par based hai? (Answer: Energy Conservation).
Power Factor ($\cos\phi$) pure inductor/capacitor ke liye ZERO aur pure resistor ke liye ONE hota hai.
- Trap Alert
MCQ me equation $I = I_0 \sin(100\pi t)$ dekar frequency puchenge. Bache sidha 100 likh dete hain, jabki $\omega = 100\pi = 2\pi f \implies f = 50\text{Hz}$ hota hai.
Pool 3: Ray & Wave Optics (2-3 Marks)
- Direct Formula
Refractive Index aur Critical Angle ka relation ($\mu = 1/\sin i_c$). Lens Power combination ($P = P_1 + P_2$). Angular separation in single slit diffraction.
- Order/Spectrum
Electromagnetic Spectrum me Wavelength/Frequency ka order. (Gamma ki frequency sabse zyada, Radio ki wavelength sabse zyada).
- Trap Alert
Puchenge: "Agar lens ko pani me duboya jaye toh focal length par kya asar padega?" (Answer: Focal length badh jayegi, almost 4 guna).
Pool 4: Modern Physics (2-3 Marks)
- Ratios
de Broglie wavelength ratio questions. (Electron, Proton, Alpha particle ko same voltage se accelerate kiya jaye toh $\lambda$ ka anupaat).
$$ \lambda = \frac{h}{\sqrt{2mK}} = \frac{h}{\sqrt{2mqV}} $$
- Definitions
Work Function, Threshold Frequency, aur Pair Production (युग्म उत्पादन) ki 1-line definition with example (Gamma photon $\rightarrow$ Electron + Positron).
- Trap Alert
Rydberg formula me Balmer series ki 'First line' ($n_2=3 \rightarrow n_1=2$) aur 'Series limit' ($n_2=\infty \rightarrow n_1=2$) ka concept MCQ me ghumata hai.
Pool 5: Semiconductors (1-2 Marks)
- Factual Logic
n-type dopants: Pentavalent (P, As, Sb).
p-type dopants: Trivalent (B, Al, Ga).
- Concept
Depletion layer thickness forward bias me ghatti hai (decreases) aur reverse bias me badhti hai (increases).
- Trap Alert
Absolute zero (0 K) par semiconductor kaisa behave karta hai? (Answer: Perfect Insulator).