Translation:Will you read this book?
You know by context. If your teacher hands you your next book assignment but knows you're considering skipping your homework tonight and asks, paqvam DalaD'a'? you can be fairly certain they're asking about your intentions for the future rather than anything else.
Without context, as an isolated sentence, there is no way to know when the sentence takes place. Klingon does not mark its verbs for tense, or when an action happens.
By the way, Did you read this book is most likely asking about whether you completed an activity. As a completed action, it needs a completed suffix: -pu' or -ta'. If, instead, it's asking something like whether this is the book your class had to read last week, not whether you completed reading it, then no completed suffix is warranted. Be careful when translating the past tense in English: determine whether you're talking about a completed activity or not.