Correct Answer: Three times 

Solution : The correct answer is Three times. 

Part XVIII of the Indian Constitution contains the emergency clauses in Articles 352 to 360.

A national emergency has been declared in each of the following three situations:

• 1962 to 1968: During the India-China war, when “the security of India” was declared as being “threatened by external aggression”.
• 1971: During the Indo-Pakistan war. V.V. Giri was the president at that time.
• 1975 to 1977: Under controversial circumstances of political instability. The emergency was declared based on “internal disturbance”. Fakhruddin Ali Ahmed was the president during the third emergency.