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 …
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 metals. Match the pair:
Green → ?
Red → ?
Blue → ?
Which harmful gas, also found in cigarette smoke, is released during cracker explosions?
Why do animals and babies get more disturbed by cracker sounds than most adults?
Environment & Health
On Diwali nights, why does a smoky haze stay trapped near the ground the next morning?
Which is safer for your lungs: a sparkler or an anar (fountain cracker) — and why?
Name one way solar-powered string lights are better than electric fairy lights.
What simple natural material can be used instead of chemical rangoli powders to make eco-friendly patterns?
Answer Key
Hot air rises (convection pulls flame upward).
Diyas: ~240 Wh; bulb: 100 Wh → Diyas use more.
Oil flow is uneven and wind disturbs open flame.
Green = Barium, Red = Strontium, Blue = Copper.
Carbon monoxide.
Their ears detect higher frequencies and are more sensitive.
Smoke mixes with cool night air and gets trapped near ground (temperature inversion).
Sparkler — burns less fuel and makes less smoke.
Solar lights save electricity, run on renewable energy, no wiring needed.
Flower petals, rice flour, turmeric, coffee powder, leaves. ————————————————
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