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Answer -
(i) It is a set. Since, collection of all natural numbers less than 50 forms a set as it is well defined.
(ii) It is not a set. Since, the term ‘good’ is not well defined.
(iii) It is a set. Since, a collection of all the girls in your class it is a definite quantity hence it is a set.
(iv) It is not a set. Since, the term ‘most’ is not well defined. A writer may be talented in the eye of one person, but he may not be talented in the eye of some other person.
(v) It is not a set. Since, the term ‘difficult’ is not well defined. A topic may be difficult for one person, but may not be difficult for another person.
(vi) It is a set. Since, a collection of novels written by Munshi Prem Chand it is a definite quantity hence it is a set.
(vii) It is a set. Since, a collection of all the questions in this chapter. It is a definite quantity hence it is a set.
(viii) It is a set. Since, a collection of all months of a year beginning with the letter J. It is a definite quantity hence it is a set.
(ix) It is not a set. Since, the term ‘most dangerous’ is not well defined. The notion of dangerous animals differs from person to person.
(x) It is a set. Since, a collection of prime integers. It is a definite quantity hence it is a set.