Heat | Physics | RRB NTPC Exam

Prepare the important Physics topic Heat (ऊष्मा) for RRB NTPC, Railway Exams, SSC and other competitive examinations with Dharmendra Shukla Sir. In this lecture, you will learn the fundamental concepts of Heat in simple language, along with important definitions, daily-life examples and exam-oriented concepts to strengthen your Physics preparation. 📚 Topics Covered in This Lecture: ✅ What is Heat? Definition and transfer of thermal energy ✅ SI and CGS Units of Heat: Joule and Calorie ✅ Three Modes of Heat Transfer: Conduction, Convection and Radiation ✅ Conductors and Insulators with Practical Examples ✅ Conduction: Igloos, Iron vs Wooden Chairs and Metal vs Ceramic Cups ✅ Convection Currents in Liquids and Gases ✅ Radiation: Heat Transfer Through Vacuum and Solar Energy ✅ Specific Heat Capacity and Land vs Water ✅ Latent Heat: Latent Heat of Fusion and Vaporization ✅ Why Does Steam Cause More Severe Burns Than Boiling Water? ✅ Evaporation and Cooling Effect: Earthen Pots (Matka) and Fans ✅ Thermal Expansion and Its Applications ✅ Anomalous Expansion of Water ✅ Thermal Expansion in Railway Tracks and Wheel Rims ✅ Important Physics Concepts for Competitive Exams ⏱️ Video Timeline / Timestamps 00:00 – Introduction to Heat (ऊष्मा) 01:02 – What Is Heat? Definition and Direction of Heat Transfer 04:06 – SI and CGS Units of Heat: Joule and Calorie 05:09 – Modes of Heat Transfer 08:28 – Conduction: Definition, Conductors and Insulators 15:02 – Practical Examples of Conduction 19:04 – Convection: Heat Transfer in Liquids and Gases 23:31 – Radiation: Heat Transfer Through Vacuum 28:02 – Specific Heat Capacity 33:17 – Latent Heat: Fusion and Vaporization 40:09 – Evaporation and Cooling Effect 45:37 – Thermal Expansion and Its Applications 🎯 Who Should Watch This Lecture? RRB NTPC aspirants Railway Group D candidates SSC CGL, CHSL and other SSC exam aspirants Students preparing for competitive exams Anyone who wants to understand basic Physics concepts in Hindi 💡 Preparation Tip: Revise the definitions, units, differences between conduction, convection and radiation, and practical applications after watching the lecture. These concepts are useful for Physics-based objective questions. 👍 If this lecture helps you in your exam preparation, LIKE the video, SHARE it with fellow aspirants and SUBSCRIBE to the channel for more Physics and competitive exam preparation lectures. 🔔 Turn on notifications so you don't miss upcoming lectures. #RRBNTPC #Physics #Heat 📚 Free Course Playlist for NTPC Exam:    • RRB NTPC 2026 Complete Course | GK, Maths,...   👉 Subscribe for regular Railway exam preparation videos.