Solution:
The most important law enforcing Article 24 prohibiting the employment of children below the age of 14 years in any factory of other hazardous activities is the child Labour (Prohibition and Regulation) Act 1986.

Solution:
The writ issued by the court to enquire into the legality of claim of a person to a public office (and thereby preventing illegal usurpation of that office) is known as Quo Warranto.

Solution:
National emergency in India can be declared under the provisions of Article-352. As per provisions of this article, if the country is threatened by war or external aggression or internal armed rebellion, National Emergency can be imposed by President for 6 months at a time. It can be declared for whole country or part of it.

Solution:
To become the Prime Minister of India, a person should be a member of either house of Parliament. In case of his membership in Rajya Sabha, minimum age required is 30 years whereas in case of membership in Lok Sabha, it is 25 years.

Solution:
Bi-cameral system. is the system of having two chambers i.e. lower house and upper house. Generally, the concept of upper house is related with representation of states at central legislature, which can be a requirement in federal setup. Therefore it is a feature of Federal system. Example- India.

Solution:
Article-352 of constitutional deals with National Emergency. President can promulgate on emergency in case of war, external aggression or armed rebellion. Proclamation of National Emergency needs to be approved Parliament within one month.

Solution:
The members of constituent assembly were elected indirectly by the members of Provincial Assemblies in the ratio of one member per one million population by method of proportional representation through single transferable vote system.