Science & Its Pedagogy
Natural Phenomena — Light, Sound & Heat (VI–VIII)
Science & Pedagogy
Paper II
4 topics
What this chapter covers
The 4 topics below make up Natural Phenomena — Light, Sound & Heat (VI–VIII) in the CTET syllabus. Open any topic for notes, solved examples and a practice MCQ test.
1Light & Reflection
2Sound
3Heat & Temperature
4Rain, Thunder, Lightning & Earthquakes
Study material & tests
📚 Study this chapter
Concept notes, key points, solved examples and hint-guided practice for every topic.
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🎯 Topic MCQ tests
8 auto-graded CTET-style questions per topic, with full explanations.
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📝 Chapter test
25 fresh mixed-difficulty questions, timed, with solutions.
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Key Concepts — Quick Reference
This chapter
Light & reflection
| Rectilinear propagation | Light travels in a straight line (gives sharp shadows, pinhole image) |
|---|---|
| Law of reflection | Angle of incidence = angle of reflection (i = r) |
| Plane mirror image | Virtual, erect, same size, as far behind as object is in front, laterally inverted |
| Lateral inversion | Left appears right & right appears left (why AMBULANCE is mirror-written) |
| Regular vs diffused | Smooth surface → regular reflection; rough surface → diffused (still obeys i = r at each point) |
Sound & heat
| Sound source | Produced by a vibrating object; needs a material medium to travel |
|---|---|
| Sound in vacuum | Cannot travel through vacuum (no particles to pass the vibration) |
| Pitch & loudness | Higher frequency → higher pitch; larger amplitude → louder sound |
| Heat flow | Heat always flows from a hotter body to a colder body until temperatures are equal |
| Three modes of heat transfer | Conduction (solids), Convection (liquids/gases), Radiation (no medium needed) |