What will be quality grading for excellent concrete as per UPV test

What will be the quality grading for excellent concrete as per the UPV test?

A) > 4.5 km/s
B) 3.5 to 4.5 km/s
C) 3.0 to 3.5 km/s
D) < 3 km/s

ANSWER= (A) > 4.5 km/s
Explain:- Correct answer for question What will be the quality grading for excellent concrete as per UPV test is (A) > 4.5 km/s
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