Ch 1 · Ratio, Proportion, Indices and Logarithms

5 concept points · 5 formulas · 4 exam-critical points.

⭐ Important points (exam-critical)

• ⭐Duplicate ratio of a:b = a²:b². Sub-duplicate = √a:√b.
• ⭐Watch unit consistency — convert to same unit before forming ratio.
• ⭐Antilog: anti(log x) = 10ˣ for common log.
• ⭐ICAI loves 2-mark direct application MCQs from log tables.