Quiz — Phy_dvr_synthese-2_mustafa.pdf

Question 1 sur 10 20:00

[{"id":39800,"question":"Quelle est l'unité de la puissance électrique ?","option_a":"Ampère (A)","option_b":"Volt (V)","option_c":"Watt (W)","option_d":"Ohm (Ω)","option_e":"","option_f":"","bonne_reponse":"c","explication":"La puissance électrique s'exprime en watts (W), symbolisée par la lettre P dans les formules.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"c\", \"options\": {\"a\": \"Ampère (A)\", \"b\": \"Volt (V)\", \"c\": \"Watt (W)\", \"d\": \"Ohm (Ω)\"}}","_debug_options_count":4},{"id":39801,"question":"La résistance d'un conducteur ohmique est-elle indépendante de la température ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"La résistance d'un conducteur dépend généralement de la température, selon la loi R = R₀(1 + αΔT).","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":39802,"question":"Quelle loi relie la tension, l'intensité et la résistance dans un circuit électrique ?","option_a":"Loi de Joule","option_b":"Loi d'Ohm","option_c":"Loi de Faraday","option_d":"Loi de Coulomb","option_e":"","option_f":"","bonne_reponse":"b","explication":"La loi d'Ohm stipule que 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\": \"b\", \"options\": {\"a\": \"Loi de Joule\", \"b\": \"Loi d'Ohm\", \"c\": \"Loi de Faraday\", \"d\": \"Loi","_debug_options_count":4},{"id":39803,"question":"Une onde mécanique peut-elle se propager dans le vide ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"Les ondes mécaniques nécessitent un milieu matériel pour se propager (ex : son, vagues).","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":39804,"question":"Quelle grandeur physique est conservée dans un système isolé selon le principe de conservation de l'énergie ?","option_a":"La vitesse","option_b":"L'énergie mécanique","option_c":"L'accélération","option_d":"La force","option_e":"","option_f":"","bonne_reponse":"b","explication":"Dans un système isolé, l'énergie mécanique totale (cinétique + potentielle) est conservée.","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 vitesse\", \"b\": \"L'énergie mécanique\", \"c\": \"L'accélération","_debug_options_count":4},{"id":39805,"question":"La fréquence d'une onde est-elle inversement proportionnelle à sa période ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"La fréquence f et la période T sont liées par la relation f = 1\/T, donc elles sont inversement proportionnelles.","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":39806,"question":"Quel est le rendement d'une machine thermique idéale fonctionnant entre deux sources à 300 K et 600 K ?","option_a":"25%","option_b":"50%","option_c":"75%","option_d":"100%","option_e":"","option_f":"","bonne_reponse":"b","explication":"Le rendement théorique maximal est donné par η = 1 - T_froide\/T_chaude = 1 - 300\/600 = 0,5 (50%).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"25%\", \"b\": \"50%\", \"c\": \"75%\", \"d\": \"100%\"}}","_debug_options_count":4},{"id":39807,"question":"La force de Lorentz s'applique-t-elle à une particule chargée en mouvement dans un champ magnétique ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"La force de Lorentz s'applique bien à une particule chargée en mouvement dans un champ magnétique : F = q(v × B).","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":39808,"question":"Quelle est l'expression de l'énergie cinétique d'un corps de masse m et de vitesse v ?","option_a":"E_c = mgh","option_b":"E_c = ½mv²","option_c":"E_c = mgh + ½mv²","option_d":"E_c = mv","option_e":"","option_f":"","bonne_reponse":"b","explication":"L'énergie cinétique est donnée par E_c = ½mv², où m est la masse et v la vitesse.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"E_c = mgh\", \"b\": \"E_c = ½mv²\", \"c\": \"E_c = mgh + ½mv²\", \"d\": ","_debug_options_count":4},{"id":39809,"question":"Un miroir concave peut-il former une image réelle d'un objet placé au-delà de son foyer ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Oui, un miroir concave forme une image réelle si l'objet est placé au-delà du foyer (distance focale).","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}]