1. No, it accelerates like a petrol car. For brisk acceleration use Sport mode.
2. Engine's in and out all the time, you don't always get a electric/petrol switch at the same point. This time of year the ICE starts first thing every day, to get the cabin warm. It'll always kick in for hard acceleration - the motor/battery alone aren't big enough for that.
3. Depends ho hard you want to accelerate. Floor it in sport and the revs will rise at sit at 6000 as long as your keep your foot in.
4. Check the figures but Corolla 2 id quicker on paper, probably down to the electric motor boost low down. But bear in mind all those figures are achieved using methods no sensible driver ever would!! In reality it's plenty quick enough.
Best is to get a test drive and see, especially if you're NOT going for the Excel. That grade has better soundproofing, so lesser grades will be noisier.