Questions & Answers about इस काम का मकसद क्या है?
Because इस is the oblique form of यह.
In Hindi, when a noun phrase is followed by a postposition such as का, को, में, से, etc., words like यह / वह usually change to their oblique forms:
- यह → इस
- वह → उस
So:
- यह काम = this work/task
- इस काम का... = of this work/task...
Here, the phrase इस काम is followed by का, so यह becomes इस.
Because का / की / ke agrees with the noun that comes after it here, namely मकसद.
मकसद is treated as masculine singular, so the correct form is का:
- इस काम का मकसद = the purpose of this work
Compare:
- इस काम की वजह = the reason for this work
because वजह is feminine - इन कामों के मकसद = the purposes of these tasks
because मकसद is plural there
So in this sentence, का matches मकसद.