Emergency Provisions

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1.
The Emergency Provisions of Indian Constitution have been borrowed from:
2.
A National emergency on the grounds of security threat is proclaimed under which among the following articles?
3.
How many types of emergencies are there in Constitution of India?
4.
Which among the following articles gives the power to the central government to take pre-emptive action to protect any state against external aggression & internal disturbances?
5.
What is true about Emergency duration under Articles 356 and 352?