MCQ Practice Mathematics 📖 একটি সরল দোলকের দৈর্ঘ্য অপরটির দ্বিগুণ । দ্বিতী... Favorite Practice Add to Book Explanation & Answer Detailed explanations and answers are restricted. Unlock full access by logging in to your account. 🔒 Unlock the detailed explanation and answers Log In / Sign Up This question appeared in KA Unit - 2013-14 [] Question 7 KA Unit - 2013-14 [] Question 7