Quantitative Aptitude: http://onlineindiaeducation.com/questions-answers/Aptitude/
Reasoning: http://onlineindiaeducation.com/reasoning/questions-answers/
General Knowledge: http://onlineindiaeducation.com/questions-answers/General-Knowledge/
Professional Knowledge (Engineering): http://www.indiabix.com/engineering/
Interviews: http://onlineindiaeducation.com/interview-questions-answers/
I think It would also be worth it to include http://www.inqueba.com as it as all the questions for preparing bank, govt exams and placements for IT Companies
nice site