Interrogative Adjectives — Les adjectifs interrogatifs
Interrogative adjectives are used to ask questions about nouns, equivalent to 'which' or 'what' in English. They agree in gender and number with the noun they modify.
Rules
Quel — used before masculine singular nouns (Quel livre ? = Which book?)
Quelle — used before feminine singular nouns (Quelle heure ? = What time?)
Quels — used before masculine plural nouns (Quels films ? = Which films?)
Quelles — used before feminine plural nouns (Quelles couleurs ? = Which colours?)
They can be used in exclamations too (Quel beau temps ! = What beautiful weather!)
Examples
Quel âge as-tu ? — How old are you? (What age do you have?)
Quelle est ta couleur préférée ? — What is your favourite colour?
Quels sports aimes-tu ? — Which sports do you like?
Quelles langues parlez-vous ? — Which languages do you speak?
Quel beau paysage ! — What a beautiful landscape!
Quelle surprise ! — What a surprise!