A few years ago the Gambling Commission tried to stop these easy quiz questions and make the answers harder, as they felt that by having such easy question there was no skill involved and this type of quiz was effectively an illegal lottery. I dont think it has worked.
For their part the TV companies claim they are just trying to appeal to the Lowest Common Denominator widest audience! They must make huge profits of they wouldn't do it.
I remember a comedy sketch about this where the question related to racing car drivers, the answers were something like a) Mrs Thatcher, b) Nigel Mansell, c) Vera Duckworth. The presenter asked for anwers on a post card to The Nigel Mansell Competion, PO BOX 123, Broadcasting House. London. But that was back in the day before premium phone line scams.