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

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

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

If the President of India exercises his power as provided under Article 356 of the Constitution of a particular State, then:

Under Article 356 of the Constitution of India, President’s Rule was imposed for the first time in –

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 ?