ভৌত জগৎ ও পরিমাপ-১

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image

একটি বক্রতলের ব্যাসার্ধ নির্ণয়ের জন্য ব্যবহার করা হয় -
(i) স্ক্রু-গজ
(ii) স্ফেরোমিটার
(iii) স্লাইড ক্যালিপার্স
নিচের কোনটি সঠিক ?

(i)
(ii)
(i) ও (iii)
(i), (ii) ও (iii)
উপরের কোনোটিই নয়

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Ans: (ii)
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