Q. Which country's first nuclear test was known as "Gerboise Bleue"?
Answer: France
Notes: Gerboise Bleue was the codename of the first French nuclear test. It was conducted by the Nuclear Experiments Operational Group (GOEN), a unit of the Joint Special Weapons Command on 13 February 1960, at the Saharan Military Experiments Centre near Reggane, French Algeria in the Sahara desert region of Tanezrouft, during the Algerian War. General Pierre Marie Gallois was instrumental in the endeavour and earned the nickname "father of the A-bomb".