AMA KOI HAE KA NHI????????
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the scientific study of natural forces such as light, sound, heat, electricity, pressure, etc.
प्रकाश, ध्वनि, ताप, विद्युत, दाब आदि प्राकृतिक शक्तियों का वैज्ञानिक अध्ययन; भौतिक विज्ञान
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