किस वैज्ञानिक ने सर्वप्रथम बर्फ के दो टुकड़ो को आपस में घिसकर पिघला दिया ? - Which scientist first melted two pieces of ice by rubbing them together? - Kis Vaigyanik Ne Sarwapratham Burf Ke Do Tukadao Ko Aapas Me Ghiskar Pighla Diya ? General Science in hindi, Physics Jule question answers in hindi pdf Devee questions in hindi, Know About Radarford General Science online test General Science notes in hindi quiz book Celcius
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