Quiz — Correction de quelques exercices 2eme trimestre Sc 2019.pdf

Question 1 sur 10 20:00

[{"id":35160,"question":"Quel est l'état physique de l'eau à 25°C et 1 atm ?","option_a":"Solide","option_b":"Liquide","option_c":"Gaz","option_d":"Plasma","option_e":"","option_f":"","bonne_reponse":"b","explication":"À 25°C et 1 atm, l'eau est à l'état liquide, car sa température est comprise entre 0°C et 100°C (point de fusion et d'ébullition).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Solide\", \"b\": \"Liquide\", \"c\": \"Gaz\", \"d\": \"Plasma\"}}","_debug_options_count":4},{"id":35161,"question":"Une transformation chimique modifie la nature des substances.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Vrai. Une transformation chimique change la nature des substances initiales pour former de nouvelles substances (ex : combustion, oxydation).","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":35162,"question":"Quelle est la formule de la tension électrique dans un circuit en série ?","option_a":"U = R × I","option_b":"U1 + U2 + ... + Un = U totale","option_c":"U = P \/ I","option_d":"U = I \/ R","option_e":"","option_f":"","bonne_reponse":"b","explication":"Dans un circuit en série, la tension totale est la somme des tensions aux bornes de chaque dipôle : U1 + U2 + ... + Un = U totale.","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\": \"U1 + U2 + ... + Un = U totale\", \"c\": \"U = P \/ ","_debug_options_count":4},{"id":35163,"question":"Le noyau d'un atome est chargé positivement.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Vrai. Le noyau contient des protons (chargés positivement) et des neutrons (neutres), donc il est globalement positif.","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":35164,"question":"Quelle est la relation entre la masse volumique (ρ), la masse (m) et le volume (V) ?","option_a":"ρ = m × V","option_b":"ρ = m \/ V","option_c":"ρ = V \/ m","option_d":"ρ = m + V","option_e":"","option_f":"","bonne_reponse":"b","explication":"La masse volumique est définie par la formule ρ = m \/ V, où m est la masse et V le volume.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"ρ = m × V\", \"b\": \"ρ = m \/ V\", \"c\": \"ρ = V \/ m\", \"d\": \"ρ = m ","_debug_options_count":4},{"id":35165,"question":"Un corps qui tombe en chute libre accélère à cause de la force de frottement.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"Faux. Un corps en chute libre accélère sous l'effet de la force de gravité (poids), et non des frottements (qui ralentissent la chute).","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":35166,"question":"Quelle est l'unité de mesure de la résistance électrique ?","option_a":"Volt (V)","option_b":"Ampère (A)","option_c":"Ohm (Ω)","option_d":"Watt (W)","option_e":"","option_f":"","bonne_reponse":"c","explication":"L'unité de la résistance électrique est l'ohm (Ω), d'après la loi d'Ohm U = R × 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\": \"Ohm (Ω)\", \"d\": \"Watt (W)\"}}","_debug_options_count":4},{"id":35167,"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":"Vrai. La photosynthèse est le processus par lequel les plantes utilisent la lumière pour produire du glucose et libérer de l'oxygène.","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":35168,"question":"Quel est le rôle principal des fusibles dans un circuit électrique ?","option_a":"Augmenter la tension","option_b":"Protéger le circuit contre les surintensités","option_c":"Stocker l'énergie","option_d":"Convertir l'énergie électrique en lumière","option_e":"","option_f":"","bonne_reponse":"b","explication":"Les fusibles protègent les circuits électriques en fondant et coupant le courant en cas de surintensité, évitant ainsi les risques d'incendie.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Augmenter la tension\", \"b\": \"Protéger le circuit contre les suri","_debug_options_count":4},{"id":35169,"question":"La vitesse de la lumière dans le vide est d'environ 300 000 km\/s.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Vrai. La vitesse de la lumière dans le vide est une constante fondamentale de la physique, égale à environ 300 000 km\/s.","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}]