1. What is a primary cause that triggers the activation of emergency provisions in the Indian Constitution?
A threat to national security such as war or external aggression
Explication
The source explicitly states that a national emergency is declared under Article 352 on grounds of war, external aggression, or armed rebellion. This indicates that the primary cause for activating emergency provisions related to national security threats, such as war or external aggression, which lead to the declaration of a national emergency.