Exam-Style Answers (Short, Clear & Scoring Format) For Himachal Pradesh Board of School Education --- 🔬 PHYSICS – Viva Answers Q1. State Ohm’s Law. Ans: At constant temperature, the current flowing through a conductor is directly proportional to the potential difference across its ends. V \propto I \quad \Rightarrow \quad V = IR Q2. SI unit of resistance? Ans: Ohm (Ω) Q3. Define focal length. Ans: The distance between the optical centre of a lens and its principal focus is called focal length. Q4. Define magnification. Ans: Magnification is the ratio of height of image to height of object. M = \frac{h_i}{h_o} Q5. Define power of lens. Ans: Power of lens is the reciprocal of focal length (in metre). P = \frac{1}{f} Q6. Real vs Virtual image (one line difference) Ans: Real image can be obtained on screen; virtual image cannot be obtained on screen. --- 🧪 CHEMISTRY – Viva Answers Q1. What is pH? Ans: pH is a scale used to measure acidity or basicity of a solution (range 0–14). Q2. D...

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