बाल पेन किस सिद्धान्त पर काम करता है? Ball Pen Ke Siddhant Per Karya Karta Hai?
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बाल पेन किस सिद्धान्त पर काम करता है? Ball Pen Ke Siddhant Per Karya Karta Hai?

(A) श्यानता

(B) बॉयल का नियम

(C) पृष्ठीय तनाव

(D) गुरुत्वीय बल
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पृष्ठ तनाव के सिद्धांत पर वाल पेन कार्य करता है। अतः इन विकल्पों में से विकल्प (C) सही उत्तर होगा।

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