Quiz — Devoir de révision (3ème trimestre) - Sciences physiques - 2ème Sciences (2010-2011) Mr Adam Bouali.pdf

Question 1 sur 10 20:00

[{"id":14134,"question":"Quelle loi physique relie la force, la masse et l’accélération ?","option_a":"Loi de Boyle-Mariotte","option_b":"Loi de Newton (F = m·a)","option_c":"Loi de Joule","option_d":"Loi d’Ohm","option_e":"","option_f":"","bonne_reponse":"b","explication":"La deuxième loi de Newton stipule que la force nette appliquée à un objet est égale au produit de sa masse par son accélération (F = m·a).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Loi de Boyle-Mariotte\", \"b\": \"Loi de Newton (F = m·a)\", \"c\": \"Lo","_debug_options_count":4},{"id":14135,"question":"Dans un circuit électrique en série, la tension aux bornes de chaque dipôle est-elle la même ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"Dans un circuit en série, la tension totale est répartie entre les dipôles. La tension aux bornes de chaque dipôle dépend de sa résistance.","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":14136,"question":"Quelle est l’unité de la puissance électrique ?","option_a":"Volt (V)","option_b":"Ampère (A)","option_c":"Watt (W)","option_d":"Ohm (Ω)","option_e":"","option_f":"","bonne_reponse":"c","explication":"La puissance électrique s’exprime en watts (W), symbole P = U·I.","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 (V)\", \"b\": \"Ampère (A)\", \"c\": \"Watt (W)\", \"d\": \"Ohm (Ω)\"}}","_debug_options_count":4},{"id":14137,"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 l’énergie) ou endothermique (absorbe de l’énergie).","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":14138,"question":"Quelle est la formule de la loi d’Ohm ?","option_a":"U = R·I","option_b":"P = U·I","option_c":"E = m·g·h","option_d":"F = m·a","option_e":"","option_f":"","bonne_reponse":"a","explication":"La loi d’Ohm s’écrit 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\": \"U = R·I\", \"b\": \"P = U·I\", \"c\": \"E = m·g·h\", \"d\": \"F = m·a\"}}","_debug_options_count":4},{"id":14139,"question":"Quel est le pH d’une solution neutre ?","option_a":"pH = 0","option_b":"pH = 7","option_c":"pH = 14","option_d":"pH = 10","option_e":"","option_f":"","bonne_reponse":"b","explication":"Une solution neutre a un pH de 7. En dessous, elle est acide ; au-dessus, elle est basique.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"pH = 0\", \"b\": \"pH = 7\", \"c\": \"pH = 14\", \"d\": \"pH = 10\"}}","_debug_options_count":4},{"id":14140,"question":"La vitesse d’un objet en chute libre dépend-elle de sa masse ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"En chute libre (sans frottement), tous les objets tombent à la même vitesse, indépendamment de leur masse (accélération = g).","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":14141,"question":"Quelle grandeur physique mesure un ampèremètre ?","option_a":"La tension","option_b":"L’intensité du courant","option_c":"La résistance","option_d":"La puissance","option_e":"","option_f":"","bonne_reponse":"b","explication":"Un ampèremètre mesure l’intensité du courant électrique, exprimée en ampères (A).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"La tension\", \"b\": \"L’intensité du courant\", \"c\": \"La résistan","_debug_options_count":4},{"id":14142,"question":"Dans une réaction acido-basique, l’acide est-il toujours le réactif qui donne des protons (H+) ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Selon la théorie de Brønsted-Lowry, un acide est une espèce capable de céder un proton (H+), tandis qu’une base en accepte un.","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":14143,"question":"Quelle est l’énergie cinétique d’un objet de masse m = 2 kg se déplaçant à une vitesse v = 3 m\/s ?","option_a":"6 J","option_b":"9 J","option_c":"18 J","option_d":"36 J","option_e":"","option_f":"","bonne_reponse":"c","explication":"L’énergie cinétique se calcule avec la formule Ec = ½·m·v² = ½·2·3² = 9 J. La réponse correcte est donc 9 J.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"c\", \"options\": {\"a\": \"6 J\", \"b\": \"9 J\", \"c\": \"18 J\", \"d\": \"36 J\"}}","_debug_options_count":4}]