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The correct answer is option 4: Financial emergency. Two types of emergencies have been declared in India internal emergency caused due to internal disturbances (option 1) and external emergency caused due to external threats (option 2). These emergencies are declared when there is a threat to the security or stability of the nation. State emergency (option 3) is declared when there is a failure of the constitutional machinery in the states. However, a financial emergency (option 4) has not been declared in India so far. A financial emergency can be declared when the financial stability of the country is at risk, such as a severe economic crisis. It grants the central government the power to take control of the financial resources of the country.