This is a very tough and tricky question. This is not a type of question that has a fix and exact answer. The answer to this question can be varied from person to person. No two aspirants will give the same answer.
However, you can answer this question by serving the nation, power and prestige associated with this job, being in a leadership position, various assignments, etc.
You can answer this as follow:
IAS as a job I believe is best in India. This is a job where you don't think about salary. This job provides opportunities to serve in leadership and key positions in government. India is a developing and welfare-oriented nation, And IAS are involved in the formulation and implementation of national policies, which gives an IAS officer ample opportunity to problem-solving, innovating, and bringing ideas to life. Moreover, professional growth in IAS is rapid. They get a chance to serve in various departments of government. This variety of assignments and rapid professional growth and are enough for high job satisfaction for me.
Last but not least, IAS's prestige and pride are also a reason I want to join IAS.
Another Ans: Everyone who prepares for this examination has some thinking and mindset about civil services or IAS. You can tell yours to the interview panel very clearly and in a very straightforward manner.
Don't try to impress the interview panel by telling lies and boasting stuff like:
I will remove corruption.
I will make India the best of the best country.
IAS can give me power, so I will make everything correct wherever I will be posted.
I will eradicate poverty.
See, these statements are vague. You will get bashed in the interview if you won't be able to put up the fact and give back your statement logically.
So, you should always say meaningful things and always be ready to follow up questions.
If you don't know anything, then you can say I don't know.
Saying irrelevant things will lead one thing to another, and you will end up with a bad interview experience. They are really smart folks. Be simple nice genuine, and speak clearly.
