1. Which is the busiest river of Europe?   River Rhone   River Ruhr   River Rhine   Hint Half-n-half Clue   2. Which of the following is a west-flowing river of France?   River Don   River Vistula   River Garrone   Half-n-half Clue   3. Which is the river famous for its picturesque rift valley?   River Thames   River Garrone   River Rhine   River Ruhr   Half-n-half Clue   4. Which is the second-longest river of Europe?   River Danube   River Dnieper   River Volga   Half-n-half Clue   5. Which river of Europe forms the fertile Lombardy Plain?   River Douro   River Tagus   River Po   Half-n-half Clue   6. Which of the following is a well-known tributary of River Rhine?   River Ruhr   River Rhone   River Oder   Half-n-half Clue   7. Which of the following is a river of Germany?   River Tagus   River Oder   River Po   Half-n-half Clue