Analysis of information sources in references of the Wikipedia article "Hindustani phonology" in English language version.
These letters—q, kh, gh, z, f—occur in words of Arabic or Persian origin. Many speakers maintain these sounds in their speech, but others often pronounce them as k, kh, g, j and ph, respectively.
... showed extremely regular patterns. As is not uncommon in a study of subphonemic detail, the objective data patterned much more cleanly than intuitive judgments ... [w] occurs when /व و/ is in onglide position ... [v] occurs otherwise ...
Only in Hindi 10 Phonemes व /v/ क़ /q/ ञ /ɲ/ य /j/ ष /ʂ/ ख़ /x/ ग़ /ɣ/ ज़ /z/ झ़ /ʒ/ फ़ /f/
Only in Hindi 10 Phonemes व /v/ क़ /q/ ञ /ɲ/ य /j/ ष /ʂ/ ख़ /x/ ग़ /ɣ/ ज़ /z/ झ़ /ʒ/ फ़ /f/