haha i put so many books on my personal statement that i hadnt read properly or had not read at all. (i said i worked in a charity shop too. that was a lie.) they never check really lol at least not in Physics interviews
I thought a Brief History of Time was good actually. Quite clear and accessible.
Feynman has the best writing style of any pop-physics writer you'll find. He even managed to make me genuinely laugh and smile at some points. Read '6 not so easy pieces' if your up to it (some very complicated stuff [I'll admit, i didnt understand some bits of it] but their explained very clearly using great analogies, examples etc)
However my fav pop-science book would definately be:
Chaos- James Gleick
I read it three times because i found it so interesting. Bits are conseptually quite hard but its the most interesing thing when you get it. Its like all these things you just presume, are totally proven wrong and you understand exactly why. Chaos Theory is more interesting than quantum physics and astrology to read about too. Great read