Quiz — CHAP12.DOC

Question 1 sur 10 20:00

[{"id":7255,"question":"Quelle est la formule de la loi d'Ohm ?","option_a":"U = R\/I","option_b":"U = R × I","option_c":"I = R × U","option_d":"R = U × I","option_e":"","option_f":"","bonne_reponse":"b","explication":"La loi d'Ohm stipule que la tension U aux bornes d'un conducteur est égale au produit de la résistance R par l'intensité du courant I (U = R × I).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"U = R\/I\", \"b\": \"U = R × I\", \"c\": \"I = R × U\", \"d\": \"R = U × I\"","_debug_options_count":4},{"id":7256,"question":"Une réaction chimique est-elle toujours exothermique ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"Une réaction chimique peut être exothermique (libère de la chaleur) ou endothermique (absorbe de la chaleur).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":7257,"question":"Quel est le symbole de l'élément chimique 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, tandis que O2 représente sa forme moléculaire diatomique.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"O\", \"b\": \"Ox\", \"c\": \"O2\", \"d\": \"Oxy\"}}","_debug_options_count":4},{"id":7258,"question":"La force de frottement est-elle toujours opposée au mouvement ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"La force de frottement s'oppose toujours au mouvement relatif entre deux surfaces en contact.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":7259,"question":"Quelle est l'unité de mesure de la puissance électrique ?","option_a":"Volt","option_b":"Ampère","option_c":"Watt","option_d":"Ohm","option_e":"","option_f":"","bonne_reponse":"c","explication":"La puissance électrique se mesure en watts (W), symbolisant l'énergie consommée par unité de temps.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"c\", \"options\": {\"a\": \"Volt\", \"b\": \"Ampère\", \"c\": \"Watt\", \"d\": \"Ohm\"}}","_debug_options_count":4},{"id":7260,"question":"Un acide a toujours un pH inférieur à 7 ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Un acide a un pH inférieur à 7, tandis qu'une base a un pH supérieur à 7. Le pH 7 correspond à une solution neutre.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":7261,"question":"Quel est le principe de conservation de l'énergie ?","option_a":"L'énergie se crée","option_b":"L'énergie se détruit","option_c":"L'énergie se transforme","option_d":"L'énergie disparaît","option_e":"","option_f":"","bonne_reponse":"c","explication":"Le principe de conservation de l'énergie stipule que l'énergie ne peut ni se créer ni se détruire, mais seulement se transformer d'une forme à une autre.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"c\", \"options\": {\"a\": \"L'énergie se crée\", \"b\": \"L'énergie se détruit\", \"c\": \"L'éne","_debug_options_count":4},{"id":7262,"question":"La vitesse d'un objet est-elle une grandeur vectorielle ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"La vitesse est une grandeur vectorielle car elle possède une direction, un sens et une intensité (module).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":7263,"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":"b","explication":"La pression P est définie comme le rapport de la force F exercée sur une surface S (P = F\/S).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"P = F × S\", \"b\": \"P = F\/S\", \"c\": \"P = S\/F\", \"d\": \"P = F + S\"}}","_debug_options_count":4},{"id":7264,"question":"Une solution saturée contient-elle la quantité maximale de soluté dissous ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Une solution saturée contient la quantité maximale de soluté dissous à une température donnée. Toute augmentation de soluté entraînera un dépôt.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4}]