Yes, but shut it off when you are taking of, and landing . For the cause of pressure breaking it.
no
Yes, with most airlines you can.
No, it is not recommended to put a watch in your checked luggage as valuable items should be kept in your carry-on bag to prevent loss or damage.
No but you can put the handbag inside a larger bag which will have the rest of your hand luggage in. You can only normally take one bag per person.
yes you can, it is only hand luggage that you cannot take aerosols in
If this is sealed, then you can but if not, better to put this in the checked bagage
No, it is not safe to put your computer in checked luggage. It is recommended to keep valuable and fragile items, such as laptops, with you in your carry-on bag to prevent damage or theft during travel.
yes all you have to do is put it in there simples!!
Probably in checked luggage. If you must carry it on, I'd put it in a plastic bag and pull it out for inspection with my toiletries. Electric toothbrush does not appear on the TSA list of prohibited items. For countries other than USA, please check those regulations.
Yes you can put a skateboard in a luggage that is not a carry on.
You can't put it on carry-on luggage, but you can put it in the luggage that goes under the plane
You cannot put in water when you just come into the airport. You can put anything other than liquid in you hand luggage.