1. No it won't affect as long as you do not over utilize them. There is no hard and fast rule about 70% or anything, but the credit controllers will apply 5% of the outstanding balance as your commitment when calculating your DSR. If you utilize more than 100% (yest it is possible, by not paying your minimum 5% for the month), then your score will likely drop.
2. Not necessarily. There is NO hard and fast rule about it. The way the credit controllers see these credit card applications are similar to other application, that is each credit application (not just credit card) will appear in your CCRIS. Is too many bad? Yes. But how many is too many. No one can give a definite answer since each credit controllers are human, each bank has an SOP but differences between the credit officers matter as well. I find that people who claim so and so is "too man" simply doesn't have experience working in a bank previously - they based their "findings" on hearsays
Are you referring to the CTOS score? Banks' credit controllers don't look at those. Those are arbitrary numbers set by CTOS, with some guidelines that they made up. It is a good score for your own reference, but it doesn't mean your score would decide everything on your loan applications
Most likely the score reported when you print out the CTOS report. The
most important "score" is your CCRIS report, but there is no "score" to speak off. Just records of your repayment, current and under-application of credits/loans