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Plz. let me know which one of these is the correct / better usage of 'subject'.

If the item was subjected to Quality Control tests, it's authenticity stands validated.
If the item was subject to Quality Control tests, it's authenticity stands validated.

Thanks a lot in advance.....
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Hi,

To answer your specific question, the following sentence is better.

If the item was subjected to Quality Control tests, it's authenticity stands validated.

It is better because WAS is past tense, so subject needs to be past tense too (subjected).

Now that we have addressed your specific question, if you have freedom to change your sentence, you might wish to write something like:

If the item passed the quality control tests, then we know it is authentic.

But that wasn't the request you made. So if helps, then great. If not, disregard.
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The main difference between
1. "was subjected"
and
2. "was subject"
is that in #1 you have a verb (to subject) in the passive voice: the simple past of "to be" + the past participle (not simple past) of "to subject". "Was subjected to" indicares an action that was performed on the item in question.
In #2 "subject" is an adjective and it indicates a state, not an action.

Miriam
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Comments  
Hi MoutainHiker,
Thanks a lot, I'll use your suggestion.
Yep, in adition to what MountainHiker said, if you were to use the second sentence, you'd essentially be saying that it's authenticity would be validated if it were required to pass through quality control tests, but it isn't necessary for the quality control tests to have actually been performed on the item. That's almost certainly NOT what you want to say. You'd say that if you were trying to make a jab at an organisation because quality control tests were prescribed but not actually performed.

Isn't English wonderful? No matter what you say it almost certainly means something, but it rarely means what you are actually trying to say. Emotion: tongue tied
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 miriam's reply was promoted to an answer.