Quiz — dl130809.pdf

Question 1 sur 10 20:00

[{"id":14294,"question":"Quelle est la formule de la vitesse moyenne d'un mobile ?","option_a":"v = d\/t","option_b":"v = t\/d","option_c":"v = a*t","option_d":"v = d*a","option_e":"","option_f":"","bonne_reponse":"a","explication":"La vitesse moyenne se calcule en divisant la distance parcourue (d) par le temps écoulé (t).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"v = d\/t\", \"b\": \"v = t\/d\", \"c\": \"v = a*t\", \"d\": \"v = d*a\"}}","_debug_options_count":4},{"id":14295,"question":"En chimie, le pH d'une solution acide est toujours inférieur à 7.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Un pH inférieur à 7 caractérise une solution acide, tandis qu'un pH supérieur à 7 indique une solution basique.","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":14296,"question":"Quelle est la loi de Newton qui décrit l'action et la réaction ?","option_a":"1ère loi (principe d'inertie)","option_b":"2ème loi (F = m*a)","option_c":"3ème loi (action-réaction)","option_d":"Loi de gravitation","option_e":"","option_f":"","bonne_reponse":"c","explication":"La 3ème loi de Newton stipule que toute action s'accompagne d'une réaction de même intensité mais de sens opposé.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"c\", \"options\": {\"a\": \"1ère loi (principe d'inertie)\", \"b\": \"2ème loi (F = m*a)\", \"c\":","_debug_options_count":4},{"id":14297,"question":"Quel est le rôle principal des mitochondries dans une cellule ?","option_a":"Stockage de l'ADN","option_b":"Production d'énergie (respiration cellulaire)","option_c":"Synthèse des protéines","option_d":"Digestion des déchets","option_e":"","option_f":"","bonne_reponse":"b","explication":"Les mitochondries sont les centrales énergétiques de la cellule, produisant de l'ATP via la respiration cellulaire.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Stockage de l'ADN\", \"b\": \"Production d'énergie (respiration cell","_debug_options_count":4},{"id":14298,"question":"La tension aux bornes d'un conducteur ohmique est proportionnelle à l'intensité du courant qui le traverse.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"C'est la loi d'Ohm : U = R*I, où U est la tension, R la résistance et I l'intensité du courant.","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":14299,"question":"Quelle est la formule de la concentration molaire d'une solution ?","option_a":"C = n\/V","option_b":"C = m\/V","option_c":"C = V\/n","option_d":"C = n*m","option_e":"","option_f":"","bonne_reponse":"a","explication":"La concentration molaire (C) est le rapport entre la quantité de matière (n, en moles) et le volume de la solution (V, en litres).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"C = n\/V\", \"b\": \"C = m\/V\", \"c\": \"C = V\/n\", \"d\": \"C = n*m\"}}","_debug_options_count":4},{"id":14300,"question":"En optique, l'angle d'incidence est toujours égal à l'angle de réflexion.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"C'est la loi de la réflexion : l'angle d'incidence est égal à l'angle de réflexion par rapport à la normale.","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":14301,"question":"Quel est le produit de la réaction entre un acide et une base ?","option_a":"Un sel et de l'eau","option_b":"Un gaz et de l'eau","option_c":"Un oxyde et de l'hydrogène","option_d":"Un métal et un gaz","option_e":"","option_f":"","bonne_reponse":"a","explication":"La réaction acido-basique produit un sel et de l'eau (neutralisation).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Un sel et de l'eau\", \"b\": \"Un gaz et de l'eau\", \"c\": \"Un oxyde et","_debug_options_count":4},{"id":14302,"question":"La photosynthèse permet aux plantes de produire de l'oxygène.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"La photosynthèse libère de l'oxygène comme sous-produit de la conversion du CO2 en glucose.","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":14303,"question":"Quelle est l'unité de la constante de Planck (h) ?","option_a":"Joule (J)","option_b":"Joule-seconde (J·s)","option_c":"Watt (W)","option_d":"Newton (N)","option_e":"","option_f":"","bonne_reponse":"b","explication":"La constante de Planck s'exprime en joule-seconde (J·s) et intervient dans les phénomènes quantiques.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Joule (J)\", \"b\": \"Joule-seconde (J·s)\", \"c\": \"Watt (W)\", \"d\": \"N","_debug_options_count":4}]