Chapter 14 Sources of Energy of class 10th Science has 24 questions. 14 questions are in between chapter 14, and 10 questions are in the back exercise of chapter 14. All questions of this chapter are good and important. But some questions are most important which are compulsory to do, and students can’t skip these questions for exams. These questions are questions 1, 2 (page 243), questions 1, 2 (page 248), questions 1, 2, 3, 4 (page 253), question 1 (page 253), questions 1, 2 (page 254) and questions 4, 5, 6, 8, 9, 10 of back exercise.