Only sentence (b) is correct. I checked whether the battery is charged. (Capitalise "I".
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????(a) My laptop doesn't get turned on.If you meant " My laptop won't power up ", the equivalent will be: " I can't get my laptop to boot up (successfully) ". You can also say " I can't get my laptop to turn on / power up". "...Get turned on " doesn't sound right.
????(b) My laptop isn't turned on.This means you laptop
????i checked whether the battery is charged?I agree with tam's suggestions, except that I'd say/write: I checked whether the battery was charged (or not). The reason is that you checked in the past whether it was charged (or not), and now you're reporting what you checked.
Laborious ????i checked whether the battery is charged?I agree with tam's suggestions, except that I'd say/write: I checked whether the battery was charged (or not). The reason is that you checked in the past whether it was charged (or not), and now you're reporting what you checked.You are correct. Should be "was". Overlooked.