P Pradeep Sikarwar 🎓 Tutor III ⭐ 9.01K Points 📊 Computer Q. When was vacuum tube invented? (A) 1900 (B) 1906 (C) 1910 (D) 1880 👁️ Show Answer 🔗 Share ⚡Menu ✅ Correct Answer: (B) 1906 You must be Logged in to update hint/solution 💬 Discussion 💬 Comment