There are several errors. The answer to the first question is wrong - the correct answer is Russia. Not sure how you can be sure about the shortest mountain or even more the shortest river. "K2" isn't being accepted as the answer for the second highest mountain. I don't have to add the word "mountain" because it is in the question. You ask for the longest river in Asia twice and give two different answers. Brahmaputra is clearly not correct.
For this quiz I am excluding Russia, I got the information about the shortest mountain or shortest river from google, I am not sure about that myself but people could just go and search about it and I have fixed the problem with the K2 question one. I meant to say "The longest river in south-east Asia" and I made a mistake by typing in the wrong answer, the correct answer was actually the Mekong river. Thanks for pointing out the mistakes for me