Light & Energy Why does the flame of a diya always point upward, even if you tilt the lamp? Which uses more energy: lighting 20 diyas for 4 hours, or keeping one 100-watt bulb on for 1 hour? Why do oil diyas sometimes flicker more than candles? Crackers & Chemistry Firecrackers get their colours from …
CBSE is changing exams so students focus on learning, not just memorizing. About half the paper will now have multiple-choice and real-life questions that test thinking and problem-solving. Shorter answers will be more important than long ones. Around 20–30% marks will come from projects, classwork, and oral tests done during the year. Question papers will …
