Here’s a free on-line ear trainer from Rick, who writes the I Was Doing All Right blog. There are full instructions on the page & it has several different customisable options for you to identify note intervals, chords & melodies, so you can make it as hard or easy as you wish.
You’ll need Java running (answer any prompts you receive on-screen & scroll down to the bottom of the page for troubleshooting if you encounter any problems).
Rick’s article also describes other hints & tips for ear training & gives his song mnemonics for learning intervals (you may want to use your own – it;s easier to pick tunes you know well if you use this method).
The ear trainer is also available for free download if you want to use it off-line.
Other quizzes include: PLUC Weekend Workout – EarMaster Reference Songs For Intervals; PLUC Weekend Workout – Speak Ukulele Challenge!; PLUC Weekend Workout – memrise on-line courses; PLUC Weekend Workout – Theta Music Trainer; PLUC Weekend Workout – Flashcard Machine; PLUC Weekend Workout – Music Reading Knowledge; A Question Of Uke – TV & Movie Themes