Quiz — 149-182 Fyzia Cls9.pdf

Question 1 sur 10 20:00

[{"id":145477,"question":"Quelle est l'unité de mesure de l'intensité du courant électrique ?","option_a":"Volt","option_b":"Ampère","option_c":"Ohm","option_d":"Watt","option_e":"","option_f":"","bonne_reponse":"b","explication":"L'intensité du courant électrique se mesure en ampères (A), d'après la loi d'Ohm et les unités du système international.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Volt\", \"b\": \"Ampère\", \"c\": \"Ohm\", \"d\": \"Watt\"}}","_debug_options_count":4},{"id":145478,"question":"Dans un circuit en série, si une lampe grille, les autres lampes continuent de briller.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"Dans un circuit en série, si une lampe grille, le circuit est ouvert et toutes les lampes s'éteignent.","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":145479,"question":"Quelle formule relie la tension (U), l'intensité (I) et la résistance (R) dans un circuit ?","option_a":"U = R\/I","option_b":"U = I × R","option_c":"R = U × I","option_d":"I = U + R","option_e":"","option_f":"","bonne_reponse":"b","explication":"La loi d'Ohm s'exprime par la formule U = R × I, où U est la tension, R la résistance et I l'intensité.","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 = I × R\", \"c\": \"R = U × I\", \"d\": \"I = U + R\"}","_debug_options_count":4},{"id":145480,"question":"Un objet en mouvement rectiligne uniforme a une accélération nulle.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Un mouvement rectiligne uniforme signifie que la vitesse est constante, donc l'accélération est bien nulle.","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":145481,"question":"Quelle est la valeur de la résistance équivalente dans un circuit en parallèle de deux résistances de 10 Ω chacune ?","option_a":"5 Ω","option_b":"10 Ω","option_c":"20 Ω","option_d":"40 Ω","option_e":"","option_f":"","bonne_reponse":"a","explication":"Pour des résistances en parallèle, la résistance équivalente R_eq est donnée par 1\/R_eq = 1\/R1 + 1\/R2. Ici, R_eq = 5 Ω.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"5 Ω\", \"b\": \"10 Ω\", \"c\": \"20 Ω\", \"d\": \"40 Ω\"}}","_debug_options_count":4},{"id":145482,"question":"La force de frottement s'oppose toujours au mouvement d'un objet.","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":145483,"question":"Quelle est l'unité de mesure de la puissance électrique ?","option_a":"Volt","option_b":"Ampère","option_c":"Watt","option_d":"Joule","option_e":"","option_f":"","bonne_reponse":"c","explication":"La puissance électrique se mesure en watts (W), d'après la formule 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\", \"b\": \"Ampère\", \"c\": \"Watt\", \"d\": \"Joule\"}}","_debug_options_count":4},{"id":145484,"question":"Dans un circuit en dérivation, l'intensité du courant dans chaque branche dépend de la résistance de cette branche.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Dans un circuit en dérivation, l'intensité se répartit selon la résistance de chaque branche (loi des nœuds).","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":145485,"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 = d × t","option_d":"v = a × t","option_e":"","option_f":"","bonne_reponse":"a","explication":"La vitesse moyenne se calcule par v = d\/t, où d est la distance parcourue et t le temps écoulé.","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 = d × t\", \"d\": \"v = a × t\"}}","_debug_options_count":4},{"id":145486,"question":"Un générateur électrique transforme l'énergie chimique en énergie électrique.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Un générateur électrique, comme une pile, convertit l'énergie chimique en énergie électrique.","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}]