Before getting all smug about how easy the questions are and expressing mock outrage that anyone could get them wrong, it's worth considering that we're all chatting here on a science themed forum - suggesting that everyone here has an above average interest in science, and thus should be expected to do better than average at a test of science literacy.
I think it's more interesting to look at which questions people were bad at. Most of the questions were answered correctly by the majority, two by slightly less than half - only one did the overwhelming majority (4 out of 5) get wrong - the question about the most common gas in the atmosphere. Knowledge of this one seemed to decline with age as well.
By contrast, the one that the highest number of people got right was about sun-tan lotion protecting us from UV. Do we have advertising to thank for this?