i) Under Article 352, the President can declare emergency if he is satisfied that India's security is threatened due to war, external aggression or armed rebellion or if there is an imminent danger or threat.
ii) When a national emergency is declared on the ground of war or external aggression it is known as external emergency.
iii) When it is declared on the ground of armed rebellion it is known as internal emergency.

i) The centre-state relations can be studied under three heads
ii) They are,     
a) Legislative relations
b) Administrative relations
c) Financial relations.

i) A writ is an order or command issued by a court in writing under its seal.
ii) It is in the nature of a command or prohibition from performing certain acts that are specified in the orders of the court.
iii) Both the Supreme Court and the High Courts are empowered to issue five kinds of writs.
iv) They are Habeas Corpus, Mandamus, Prohibition, Certiorari and Quo Warranto.

i) Right to Equality
ii) Right to Freedom
iii) Right against Exploitation
iv) Right to Religion
v) Cultural & Educational Rights
vi) Right to Constitutional Remedies

i) The Constitution is the fundamental law of a country which reflects the fundamental principles on which the government of that country is based
ii) It is the vehicle of a Nation's progress.
iii) The concept of Constitution first originated in USA