4, 4, 8, 24, 96, 480, (?)

127, 131, 139, ?, 151, 157, 163, 167, 

Name the first Indian private company to successfully test solid fuel rocket engine dubbed as Kalam-5?

In which field did the Indian and Vietnamese Navy conduct their PASSEX exercises?

Sunil Kothari, who has died recently, was a famous historian of ___________.

Who is the author of the book "Sutranivednachi sutra- ek anbav" ("Sutarnavanachi Sutra-ik Ambav")?

PM Modi recently flagged off India's 100th Farmers Rail. This new service has been started to connect which states?

In which city has PM Modi inaugurated the first fully automated driverless train service in India?