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Example:
requirement --> requirements
qualification -- qualifications
query -- queries

Are the above nouns are countable nouns?
Can I add "s" after these nouns?

Are there any good way or dictionary which can help us to determine if a particular abstract noun is a countable or uncountable noun.
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Those nouns are countable.
Most good dictionaries show when a noun is countable or uncountable by having the letter 'C' or 'U' next to it. Try the Oxford Advanced Learner's Dictionary. It shows you this.
Comments  
Yeah, they are countable nounsEmotion: smile

It depends on the situation, sometimes an abstract noun can be defined as countable if you mean different thing.

eg time

You can make it a countable noun if you refer to the particular time frame.

eg. I came in several times before and each time I saw different questions postedEmotion: smile
Students: Are you brave enough to let our tutors analyse your pronunciation?
 Woodward's reply was promoted to an answer.
Thank you so much!!!!!!!!!!Emotion: big smile