Quiz — Devoir de Synthèse N°2 Lycée pilote - Sciences physiques - 3ème Math (2013-2014) Mme LARIF HAYET .pdf

Question 1 sur 10 20:00

[{"id":60109,"question":"Quelle est la relation entre la force, la masse et l'accélération selon la 2ème loi de Newton ?","option_a":"F = m × a","option_b":"F = m \/ a","option_c":"F = a \/ m","option_d":"F = m + a","option_e":"","option_f":"","bonne_reponse":"a","explication":"La 2ème loi de Newton stipule que la force résultante est égale au produit de la masse par l'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\": \"a\", \"options\": {\"a\": \"F = m × a\", \"b\": \"F = m \/ a\", \"c\": \"F = a \/ m\", \"d\": \"F = m + a\"","_debug_options_count":4},{"id":60110,"question":"Dans un circuit électrique, si la tension aux bornes d'une résistance augmente, l'intensité du courant traversant cette résistance...","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Selon la loi d'Ohm (U = R × I), si U augmente et R est constante, alors I augmente également.","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":60111,"question":"Quelle est l'unité de la concentration molaire (molarité) dans le système international ?","option_a":"mol\/L","option_b":"g\/L","option_c":"mol\/m³","option_d":"g\/mL","option_e":"","option_f":"","bonne_reponse":"a","explication":"La concentration molaire s'exprime en moles par litre (mol\/L), notée aussi M.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"mol\/L\", \"b\": \"g\/L\", \"c\": \"mol\/m³\", \"d\": \"g\/mL\"}}","_debug_options_count":4},{"id":60112,"question":"Un objet placé à 20 cm d'une lentille convergente de distance focale 10 cm formera une image...","option_a":"Réelle, inversée et agrandie","option_b":"Réelle, inversée et réduite","option_c":"Virtuelle, droite et agrandie","option_d":"Aucune image ne se forme","option_e":"","option_f":"","bonne_reponse":"a","explication":"Avec un objet placé au-delà du foyer (2f \u003E 20 cm \u003E f), l'image est réelle, inversée et agrandie.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Réelle, inversée et agrandie\", \"b\": \"Réelle, inversée et réd","_debug_options_count":4},{"id":60113,"question":"La réaction entre un acide et une base produit toujours de l'eau et un sel.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Cette affirmation est vraie : une réaction acido-basique produit de l'eau (H₂O) et un sel (ex: NaCl).","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":60114,"question":"Quelle est la formule de la puissance électrique P en fonction de la tension U et de l'intensité I ?","option_a":"P = U × I","option_b":"P = U \/ I","option_c":"P = I² × R","option_d":"P = U² \/ R","option_e":"","option_f":"","bonne_reponse":"a","explication":"La puissance électrique P est donnée par P = U × I, où U est la tension 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\": \"P = U × I\", \"b\": \"P = U \/ I\", \"c\": \"P = I² × R\", \"d\": \"P = U²","_debug_options_count":4},{"id":60115,"question":"Dans une solution saturée de chlorure de sodium (NaCl), si on ajoute plus de NaCl...","option_a":"La concentration reste constante","option_b":"La concentration augmente","option_c":"Le NaCl ne se dissout plus","option_d":"La solution devient acide","option_e":"","option_f":"","bonne_reponse":"c","explication":"Une solution saturée ne peut plus dissoudre davantage de soluté à température donnée, le NaCl en excès reste solide.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"c\", \"options\": {\"a\": \"La concentration reste constante\", \"b\": \"La concentration augment","_debug_options_count":4},{"id":60116,"question":"La vitesse de la lumière dans le vide est-elle indépendante du référentiel ?","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 (c ≈ 3×10⁸ m\/s) est une constante universelle, indépendante du référentiel.","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":60117,"question":"Quel est le pH d'une solution de HCl à 0,01 mol\/L ?","option_a":"pH = 2","option_b":"pH = 1","option_c":"pH = 7","option_d":"pH = 12","option_e":"","option_f":"","bonne_reponse":"a","explication":"Le pH d'une solution acide se calcule par pH = -log[H⁺]. Ici, [H⁺] = 0,01 mol\/L, donc pH = -log(0,01) = 2.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"pH = 2\", \"b\": \"pH = 1\", \"c\": \"pH = 7\", \"d\": \"pH = 12\"}}","_debug_options_count":4},{"id":60118,"question":"La loi de conservation de l'énergie s'applique-t-elle aux systèmes mécaniques isolés ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Vrai : dans un système mécanique isolé, l'énergie mécanique totale (cinétique + potentielle) se conserve.","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}]