SSC CGL Physics · Free notes
Sound: SSC CGL Physics
Sound has seven questions in the SSC CGL Tier I bank: one from the 2024 shifts and six from the 2025 shifts, and none from the 2023 shifts. Four are on the wave equation and what changes between air and water; the rest are on the Doppler effect and hearing. One page gives the formula and the rules.
The handout has every subtopic, worked example, formula and trap with answers shown. The formula sheet is the chapter’s formulas and traps alone, on one page.
Subtopic notes
Formula & revision sheet
1 formulas · 1 reference tables · 2 gotchas across all subtopics — the exam-eve cheat-sheet
Formula & revision sheet
1 formulas · 1 reference tables · 2 gotchas across all subtopics — the exam-eve cheat-sheet
Formulas (1)
Reference tables (1)
Watch out for (2)
- Faster medium, longer wavelength→ The wave equation
- No relative motion, no change→ The Doppler effect and hearing
PYQ weightage by concept
2 concepts · 7 PYQs — where the marks actually sit, so you know what to drill first
PYQ weightage by concept
2 concepts · 7 PYQs — where the marks actually sit, so you know what to drill first
| Concept | PYQs | Share |
|---|---|---|
| The wave equation | 4 | 57% |
| The Doppler effect and hearing | 3 | 43% |
Test yourself on a real paper
Sit a past SSC CGL paper, timed and marked the way the exam marks it. You see your score and every answer the moment you finish. Free to start.