Hello Naresh!!articles used before material nouns.'A' is used before a word beginning with a consonant sound(for singular noun only).'An' is used before a word beginning with vowel sound or voiceless or week H.hope this helps you.do practice examples you can get clarity on the topic.
Question : Which Article of the Constitution of India mentions that business in Parliament shall be transacted in Hindi or English?
Option 1: Article 120
Option 2: Article 121
Option 3: Article 122
Option 4: Article 119
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