Number = Quotient * divisor + remainder
7/5 means 1*5 + 2 (1 quotient, 5 divisor and 2 remainder)
19/5 means 3*5 + 4 (3 quotient, 5 divisor and 4 remainder)
Quotient represents how many times the divisor is contained in the number.
Now coming to your question: 1/5
how many times is 5 contained in 1? ZERO
What is the left over? ONE
can we write 1/5 = 0*5 + 1. Yes we can
Hence 1/5 has 0 quotient and 1 remainder.