I've underlined my correction:
1. What is the name of the current Prime Minister of Pakistan?
3. What city in Pakistan is famous for its sporting goods?
5. What is the name of the National flower of Pakistan?
11. What are the names of the four Muslim Caliph?
13. What is the name of the first shuttle to orbit the Earth?
16. What country's name means "Land of the Rising Sun"?
Note, "which" refers to a choice; e.g., Which do you prefer, strawberry or chocolate?