Answer : 1. "एक मानव रहित हवाई वाहन"
Explanation :

1. In technical language, the drone is an unmanned aircraft. These drones are formally known as Unmanned Aerial Vehicles (UAVs) or Unmanned Aircraft Systems (UASs). Drones are flying robots that are controlled via remote or fly automatically through software-controlled flight plans, which are embedded systems that work with the help of sensors and GPS.