Can anyone please confirm the answers of following mcqs?.

1). Sky appears blue due to:
2). Largest museum in the world: Louvre Museum in France OR Museum of Washington
3). How many members National Security Council (Pakistan) has: 15 or 20
4). Pakistan conduct first-ever joint military drills with Russia at which place:
5). First private airline of Pakistan is: Orient or Hajvari
6). Sohni Mahiwal is related to which river:

Thanks in advance.