Quiz — ipeis-ds2-pc-t-2018-c.pdf

Question 1 sur 10 20:00

[{"id":26354,"question":"Quelle est l'unité SI de la constante de Planck (h) ?","option_a":"J·s","option_b":"eV","option_c":"kg·m²\/s","option_d":"C·V","option_e":"","option_f":"","bonne_reponse":"a","explication":"La constante de Planck s'exprime en joule-seconde (J·s) dans le système international. Elle est fondamentale en mécanique quantique.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"J·s\", \"b\": \"eV\", \"c\": \"kg·m²\/s\", \"d\": \"C·V\"}}","_debug_options_count":4},{"id":26355,"question":"Une réaction chimique est dite exothermique si elle libère de l'énergie sous forme de chaleur.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Une réaction exothermique libère effectivement de l'énergie thermique, ce qui correspond à une diminution de l'enthalpie du système (ΔH \u003C 0).","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":26356,"question":"La loi de Beer-Lambert relie l'absorbance (A) à la concentration (c) par la formule :","option_a":"A = ε·l·c","option_b":"A = ε·c\/l","option_c":"A = l\/(ε·c)","option_d":"A = ε\/(l·c)","option_e":"","option_f":"","bonne_reponse":"a","explication":"La loi de Beer-Lambert s'écrit A = ε·l·c, où ε est le coefficient d'absorption molaire, l la longueur de la cuve et c la concentration.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"A = ε·l·c\", \"b\": \"A = ε·c\/l\", \"c\": \"A = l\/(ε·c)\", \"d\": \"A ","_debug_options_count":4},{"id":26357,"question":"Le mouvement d'un projectile est toujours rectiligne.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"Le mouvement d'un projectile est parabolique sous l'effet de la gravité (trajectoire courbe), sauf si la vitesse initiale est verticale.","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":26358,"question":"Quelle est la formule de l'énergie cinétique (Ec) d'un corps de masse m et de vitesse v ?","option_a":"Ec = ½·m·v²","option_b":"Ec = m·v","option_c":"Ec = m·g·h","option_d":"Ec = ½·m·v","option_e":"","option_f":"","bonne_reponse":"a","explication":"L'énergie cinétique s'exprime par Ec = ½·m·v², où m est la masse et v la vitesse du corps.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Ec = ½·m·v²\", \"b\": \"Ec = m·v\", \"c\": \"Ec = m·g·h\", \"d\": \"Ec","_debug_options_count":4},{"id":26359,"question":"La tension aux bornes d'un conducteur ohmique est proportionnelle à l'intensité du courant qui le traverse.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"C'est la loi d'Ohm : U = R·I, où U est la tension, R la résistance et I l'intensité. La tension est donc bien proportionnelle à 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":26360,"question":"Quel est le nombre quantique principal (n) correspondant à la couche K d'un atome ?","option_a":"n = 1","option_b":"n = 2","option_c":"n = 3","option_d":"n = 4","option_e":"","option_f":"","bonne_reponse":"a","explication":"La couche K correspond à n = 1, la couche L à n = 2, etc. Le nombre quantique principal définit l'énergie et la taille de l'orbitale.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"n = 1\", \"b\": \"n = 2\", \"c\": \"n = 3\", \"d\": \"n = 4\"}}","_debug_options_count":4},{"id":26361,"question":"La réaction de combustion du méthane (CH4) produit du dioxyde de carbone et de l'eau.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"L'équation de combustion complète du méthane est : CH4 + 2O2 → CO2 + 2H2O. Elle produit bien du CO2 et de l'eau.","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":26362,"question":"Quelle est l'unité SI de la résistance électrique ?","option_a":"Ohm (Ω)","option_b":"Ampère (A)","option_c":"Volt (V)","option_d":"Watt (W)","option_e":"","option_f":"","bonne_reponse":"a","explication":"L'unité de la résistance électrique est l'ohm (Ω), définie par 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\": \"a\", \"options\": {\"a\": \"Ohm (Ω)\", \"b\": \"Ampère (A)\", \"c\": \"Volt (V)\", \"d\": \"Watt (W)\"}}","_debug_options_count":4},{"id":26363,"question":"La vitesse de réaction augmente toujours avec la température.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"La vitesse de réaction augmente généralement avec la température selon la loi d'Arrhenius, car les molécules ont plus d'énergie cinétique pour franchir la barrière d'activation.","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}]