In which of the following countries has the Indian Army launched a major bridge project under Operation Sagar Bandhu?

Under the leadership of which of the following, the Cold Response military exercise is being organised by the North Atlantic Treaty Organisation (NATO)? 

Which of the following has developed a long-range swarm attack drone called Sheshnag-150?

On which of the following days is World Glaucoma Day observed every year?

Madurai Airport located in which state has been approved to be given international status?