Quiz : Les sciences en 3ème — Testez vos connaissances !

Question 1 sur 10 10:00

[{"id":21928,"question":"Quel est le symbole chimique de l'oxygène ?","option_a":"O","option_b":"Ox","option_c":"O2","option_d":"Oxy","option_e":"","option_f":"","bonne_reponse":"A","explication":"Le symbole chimique de l'oxygène est O. O2 représente la molécule de dioxygène, mais l'atome seul est noté O.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":21929,"question":"Un changement d'état physique est toujours réversible.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"Un changement d'état physique (solide → liquide → gaz) est réversible, car il ne modifie pas la nature de la matière.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":21930,"question":"Quelle est la formule de la vitesse ?","option_a":"v = d × t","option_b":"v = d \/ t","option_c":"v = t \/ d","option_d":"v = d + t","option_e":"","option_f":"","bonne_reponse":"B","explication":"La vitesse est calculée par la formule v = d \/ t, où d est la distance et t le temps.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":21931,"question":"La photosynthèse produit de l'oxygène.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"La photosynthèse, réalisée par les plantes, produit de l'oxygène comme sous-produit.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":21932,"question":"Quel est le pH d'une solution neutre ?","option_a":"0","option_b":"7","option_c":"14","option_d":"10","option_e":"","option_f":"","bonne_reponse":"B","explication":"Une solution neutre a un pH de 7. Les solutions acides ont un pH \u003C 7, et les basiques un pH \u003E 7.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":21933,"question":"La gravité est une force qui attire les objets vers le centre de la Terre.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"La gravité est bien une force d'attraction exercée par la Terre sur les objets.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":21934,"question":"Quelle est l'unité de mesure de la force ?","option_a":"Newton (N)","option_b":"Watt (W)","option_c":"Joule (J)","option_d":"Pascal (Pa)","option_e":"","option_f":"","bonne_reponse":"A","explication":"L'unité de mesure de la force est le Newton (N), en hommage à Isaac Newton.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":21935,"question":"Un atome est toujours électriquement neutre.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"Un atome est électriquement neutre car il contient autant de protons (chargés +) que d'électrons (chargés -).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":21936,"question":"Quelle est la formule de la pression ?","option_a":"P = F \/ S","option_b":"P = F × S","option_c":"P = S \/ F","option_d":"P = F + S","option_e":"","option_f":"","bonne_reponse":"A","explication":"La pression est calculée par la formule P = F \/ S, où F est la force et S la surface.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":21937,"question":"Les métaux sont de bons conducteurs de chaleur.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"Les métaux sont effectivement d'excellents conducteurs de chaleur et d'électricité.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0}]