Question

(determiners)1.My brother is ...... NCC cadet​

Answer 1

Here in this sentence the in the blank it will be an, so the whole sentence will be My brother is an NCC cadet​.

As it goes against the normal rule of grammar but it is actually called determinant.

In determinant the articles used differently than what is generally known.

As the N the first letter of the word is a consonant and but pronounced like a vowel so instead of a it will be an.