Be honest. Also mention keywords such as challenging, steep learning curve, good work culture, demanding, rewarding, opportunities for advancement and growth, team environment, opportunity to build and maintain client relationships etc.
8. Why are you looking to make a career change?
Mention your interests and make sure you bring up all skills/ experience however insignificant that can support your move in this new direction. It is quite common in this day and age to make a career switch. You need however to show that you have very carefully thought about the change, have a strong interest in the new career and can use some of your previous skills/ education/ relationships to make that move.
9. Why did you leave your last job?
Do NOT use this as an opportunity to badmouth past employers or peers or talk about a failure of any sort. Any of these answers are acceptable: you were looking for a new challenge, your learning curve had flattened out in the previous job and you were looking for a new learning opportunity, the company or department were restructuring, you were ready to start something new after achieving your career goals at the previous company etc.