IMO Practice Test — Word Formation
8 Questions • 15 min • Olympiad level
15:00
Question 1 of 8
Form the opposite with the correct prefix: 'legal'.
unlegal
illegal
dislegal
mislegal
Explanation: The opposite of 'legal' is 'illegal' (prefix il-).
Question 2 of 8
Choose the correctly spelled word.
unneccessary
unnecessary
unecessary
unnecesary
Explanation: un + necessary = unnecessary (double n, double s).
Question 3 of 8
Which suffix turns 'create' into a noun?
-ful
-ion
-ly
-less
Explanation: create → creation (-ion makes a noun).
Question 4 of 8
Identify the root: 'irresponsibility'.
ir
response
responsible
ity
Explanation: Remove ir- and -ity → 'responsible' (root sense 'response').
Question 5 of 8
Choose the correct prefix for the opposite of 'regular'.
un-
ir-
dis-
mis-
Explanation: 'irregular' uses the prefix ir-.
Question 6 of 8
Which word is an adjective?
beautify
beautiful
beauty
beautifully
Explanation: '-ful' makes the adjective 'beautiful'.
Question 7 of 8
Rearrange to form a word: 'ness / care / less'
carelessness
lessnesscare
nesscareless
carenessless
Explanation: care + less + ness = carelessness.
Question 8 of 8
Choose the word that means 'judge wrongly'.
rejudge
prejudge
misjudge
unjudge
Explanation: 'mis-' = wrongly: misjudge.