Under which Article of the Constitution of India can the President proclaim National Emergency?

Which Article of the Indian Constitution deals with the proclamation of Emergency ?

Which one of the following is not a circumstance for proclamation of Emergency by the President of India under Article 352 of the Constitution of India ?

Under which Article of the Indian Constitution President’s Rule can be imposed in a State?

According to which Article ‘National Emergency may be declared by the president of India?

Under which article of the Constitution the President can take over the administration of a State in his own hand?