Quiz — Physique.ép.syn.pdf

Question 1 sur 10 20:00

[{"id":47868,"question":"Quelle est la relation entre la tension U, l'intensité I et la résistance R dans un circuit série selon 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 s'exprime par U = R × I, où U est la tension en volts, R la résistance en ohms et I l'intensité en ampères.","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":47869,"question":"Un objet est placé à 20 cm d'une lentille convergente de distance focale 10 cm. L'image formée est-elle réelle ou virtuelle ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"L'image est réelle car l'objet est placé au-delà du foyer objet (20 cm \u003E 10 cm).","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":47870,"question":"Quelle est l'énergie cinétique d'un corps de masse 2 kg se déplaçant à une vitesse de 3 m\/s ?","option_a":"3 J","option_b":"6 J","option_c":"9 J","option_d":"18 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.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"c\", \"options\": {\"a\": \"3 J\", \"b\": \"6 J\", \"c\": \"9 J\", \"d\": \"18 J\"}}","_debug_options_count":4},{"id":47871,"question":"La puissance électrique P dissipée par un dipôle ohmique est donnée par P = U × I. Cette formule est-elle toujours valable ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Oui, cette formule est valable pour tout dipôle ohmique, quelle que soit la tension ou l'intensité.","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":47872,"question":"Quelle est la bonne relation entre la période T et la fréquence f d'un signal périodique ?","option_a":"T = f","option_b":"T = 1\/f","option_c":"f = 1\/T","option_d":"T = f²","option_e":"","option_f":"","bonne_reponse":"c","explication":"La fréquence f est l'inverse de la période T : f = 1\/T.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"c\", \"options\": {\"a\": \"T = f\", \"b\": \"T = 1\/f\", \"c\": \"f = 1\/T\", \"d\": \"T = f²\"}}","_debug_options_count":4},{"id":47873,"question":"Un mobile en mouvement rectiligne uniforme a une accélération nulle. Cette affirmation est-elle correcte ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Oui, un mouvement rectiligne uniforme implique une accélération 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":47874,"question":"Quelle est la distance focale d'une lentille convergente si sa vergence est de +5 dioptries ?","option_a":"0,2 m","option_b":"5 m","option_c":"20 cm","option_d":"50 cm","option_e":"","option_f":"","bonne_reponse":"a","explication":"La vergence C = 1\/f, donc f = 1\/C = 1\/5 = 0,2 m = 20 cm.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"0,2 m\", \"b\": \"5 m\", \"c\": \"20 cm\", \"d\": \"50 cm\"}}","_debug_options_count":4},{"id":47875,"question":"La force de gravitation entre deux corps est proportionnelle au produit de leurs masses et inversement proportionnelle au carré de la distance qui les sépare. Cette loi est-elle celle de Newton ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Oui, c'est la loi de la gravitation universelle de Newton.","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":47876,"question":"Un circuit électrique est composé de deux résistances R1 = 10 Ω et R2 = 20 Ω en parallèle. Quelle est la résistance équivalente Req ?","option_a":"6,67 Ω","option_b":"30 Ω","option_c":"15 Ω","option_d":"10 Ω","option_e":"","option_f":"","bonne_reponse":"a","explication":"Pour des résistances en parallèle, 1\/Req = 1\/R1 + 1\/R2 → Req = (R1 × R2)\/(R1 + R2) = 200\/30 ≈ 6,67 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\": \"6,67 Ω\", \"b\": \"30 Ω\", \"c\": \"15 Ω\", \"d\": \"10 Ω\"}}","_debug_options_count":4},{"id":47877,"question":"L'indice de réfraction d'un milieu est toujours supérieur à 1. Cette affirmation est-elle vraie ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Oui, l'indice de réfraction n d'un milieu est toujours supérieur ou égal à 1 (n = 1 dans le vide).","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}]