KP3模拟试题
2023年三级安全评价师考试-专业能力模拟试题2
2022年三级安全评价师考试-专业能力模拟试题2姓名年级学号题型选择题填空题解答题判断题计算题附加题总分得分评卷人得分一、单项选择题1.在安全验收评价中,专项检测、检验或取证资料不包括()。
A.特种设备取证资料汇总B.避雷设施检测报告C.防爆电气设备检验报告D.岗位安全操作规程√2.下列属于化学性危险和有害因素的是()。
A.粉尘与气溶胶√B.信号缺陷C.传染病媒介物D.易燃易爆性物质3.下列不属于安全检查表的作用是()。
A.可以使检查内容较周密和完整B.可以保持现场检查时的连续性和节奏性C.可减少评价人员的随意性D.可以预防不安全事故的发生√4.按照国务院第493号令,生产安全事故分为()个等级。
A.3B.4 √C.5D.65.电路器上的熔断器属于()控制措施。
A.隔离B.利用薄弱环节√C.避难与救援D.个体防护6.抓住评价项目安全评价最直接的关键是()。
A.单元评价结果B.各类评价结果C.单项评价结果√D.综合评价结果7.下列不属于建筑安全生产条件的是()。
A.建立安全生产责任制,制定完备的安全生产规章制度和操作规程B.安全设施投入符合安全生产要求C.安全技术规程和作业安全规程及其持续改进情况√D.主要负责人和安全生产管理人员经考核合格8.下列不属于设备装置防爆意义中预防事故设施的是()。
A.物质组分控制设施B.防止助燃物混入措施C.控制各种点火源√D.压力计、温度计、流量计及各种检测报警设施9.安全对策措施的基本要求不包括()。
A.能消除或减弱生产过程中产生的危险、危险B.遵循提出安全对策的原则√C.预防安装失灵和操作失误产生的危险、危害D.能有效地预防重大事故和职业危害的发生10.适用于净化苯类、醇类、酯类和酮类等有机蒸气的气体净化和回收的方法是()。
A.吸附法√B.洗涤法C.袋滤法D.燃烧法11.下列不属于物理性危险和有害因素的是()。
A.设备和设施缺陷B.信号缺陷C.标志缺陷D.负荷超限√12.信息数据的内容不包括()。
全国化学竞赛模拟考试 33届问题详解
标准文档31届中国化学奥林匹克(初赛)模拟试题第参考答案及评分标准10分)第1题(锰最简单的羰基配合物在液氨中与金属钾作用可得到唯一产物,该产物为一种羰合金1-1属阴离子化合物。
1-1-1写出反应方程式。
分(CO) + 2K = 2 K[Mn(CO)] 1Mn5210规则。
1-1-2说明两羰合物均符合EAN键,总电子Mn - Mn提供2个电子,形成一个0)提供7个电子,CO (十羰基合二锰:Mn 分,符合。
110+2=36=18×2+2××2数7 分,符合。
1-1)提供8个电子,8+10=18K[Mn(CO)]:Mn(5金属铍易溶于氟氢化铵水溶液中,所得溶液的溶质受热分解可用于制备无水氟化铍。
1-2 写出这两个反应的方程式。
BeF + H)Be + 2 NHHF = (NH2442242分)BeF = 2 NHF + BeF(NH22444)作用可产生的合金在乙二胺中与穴状配体(可记作crypt用化学式可表示为NaPb1-32.25元元素或Pb一种含全金属裸簇阴离子的暗红色晶体,且若反应完全进行,则没有Na 素的剩余。
写出反应方程式。
1-3-1 ] 4 NaPb + 4 crypt = [Na(crypt)][Pb分292.254若阴离子中只有一个四重旋转轴,不存在镜面与对称中心,试指出阴离子的结构。
1-3-2分。
加冠四方反棱柱,其中冠加在四边形面上。
1分)题(19第2用溴氧化互为等电子体的盐,盐AA2-1 十硫化四磷与氟化钾作用可得到盐与另一种与A B。
可以得到共价化合物2-1-1写出两个反应的方程式。
FF + 2 KPS+ 6 KF = 2 KPSPS2 410 322分各1SF+ Br = 2KBr + PF 2KPS 224 22 4的结构。
与BA2-1-2画出分 B 2分A 1:B:A实用大全.标准文档,试画C二(二异丙胺基)氯化磷与三氯化铝在液态二氧化硫中作用可得到离子化合物2-2的稳定的共振结构式。
电工三级模拟习题(含参考答案)
电工三级模拟习题(含参考答案)一、单选题(共120题,每题1分,共120分)1.可编程控制器编程灵活,编程语言由梯形图、布尔助记符、( )、功能模块图和语句描述。
A、安装图B、逻辑图C、功能表图D、原理图正确答案:C2.控制按钮主要由按钮帽、动触头、( )、复位弹簧和外壳等所组成。
A、线圈B、齿轮C、手柄D、静触头正确答案:D3.噪声可分为气体动力噪声、机械噪声和( )。
A、电气噪声B、电磁噪声C、电力噪声D、水噪声正确答案:B4.如果中频发电机的端电压达到额定值而其电流不足额定值,则需( )线圈的匝数。
A、减小淬火变压器二次B、增大淬火变压器二次C、增大淬火变压器一次D、减小淬火变压器一次正确答案:D5.检查供电电源时,在电源端子处测量电压是否在标准范围内上限不超过供电电压的( )。
A、60%B、75%C、85%D、110%正确答案:D6.台钻是一种小型钻床,用来钻直径( )以下的孔。
A、13mmB、12mmC、10mmD、11mm正确答案:B7.下列金属及合金的熔点最高的是( )。
A、钨B、黄铜C、铅D、铬正确答案:A8.当锉刀拉回时,应( ),以免磨顿锉齿或划伤工件表面。
A、抬起B、拖回C、轻轻划过D、稍微抬起正确答案:D9.选用功率表时应使电流量程不小于负载电流,电压量程( )负载电压。
A、不大于B、不低于C、不等于D、等于正确答案:B10.在要求零位附近快速频繁改变转动方向,位置控制要求准确的生产机械中,往往用可控环流可逆系统,即在负载电流小于额定值( )时,人为地制造环流,使变流器电流连续。
A、1%~5%B、5%~10%C、10%~15%D、15%~20%正确答案:C11.调频信号输入到方波变换器变成两组互差180°的方波输出,经( ),传送至双稳态触发电路形成两组互差180°的矩形脉冲。
A、积分电路后产生尖脉冲B、微分电路后产生锯齿波C、积分电路后产生锯齿波D、微分电路后产生尖脉冲正确答案:D12.FX系列PLC中,如果只有CJP而无EJP指令时,程序将执行( )指令。
焊工模拟考试试题(含答案)kp
焊工考试试题(含答案)一、单项选择题1.对于金属烟尘的防范,最有效的方式是()。
A.带面罩B.通风措施C.带口罩【答案】B2.进行水下焊割作业时,应使用(),严禁使用()。
A.直流电B.交流电【答案】A3.焊接电源电缆若需接长,应用瓷瓶固定并沿墙架高()米以上A.2.2B.2.5C.2D.3【答案】B4.当压力为0.15MP、温度超过()时,就能使乙炔自行爆炸A.480℃B.580℃C.680℃D.280℃【答案】B5.()焊属于最古老的焊接工艺A.铆B.铅C.钎【答案】D E.熔化【答案】C6.电阻焊的电源电压较高,为防止触电,要求接入焊接变压器一次线圈必须有良好的绝缘,并安装安全()。
A.断电开关B.熔断丝C.刀闸断电【答案】A7.影响爆炸极限的因素很多,可燃物质与空气的混合气体或蒸汽的压力越大,则爆炸极限()危险性越大。
A.越宽B.越窄C.不变8.电流对人体的伤害中,最危险的伤害是()。
A.电击B.电伤C.电磁场生理伤害【答案】A9.乙炔瓶着火时,不宜用()灭火剂扑救。
A.干粉B.CO2C.水【答案】C10.钍钨极和纯钨极氩弧焊相比,主要危害是()A.高频电磁场B.放射性C.弧光辐射【答案】B11.在CO2气体保护焊焊接收弧时,为保护弧坑熔化金属的凝固,则供气系统在收弧时应()断气。
A、提前1~2sB、同时C、滞后2~3s【答案】C12.焊工吸取多量碱性焊条烟尘或其他金属(铜、锌等)烟尘,引起的急性体温升高的现象称为( )。
A、焊工金属烟热B、焊工尘肺C、锰中毒D、皮炎【答案】C13.氧气瓶在阳光下曝晒可能产生( )。
A、泄漏B、氧气不纯C、爆炸D、燃烧【答案】C14.按《特种设备安全法》规定,特种设备使用单位违反本法规定,使用未取得许可生产,未经检验或者检验不合格的特种设备,或者国家明令淘汰、已经报废的特种设备的,( )A、责令停止使用有关特种设备B、责令停止使用有关特种设备,处三万元以上三十万元以下罚款C、责令限期改正;逾期未改正的,处三万元以上三十万元以下罚款D、责令限期改正;逾期未改正的,责令停止使用有关特种设备,处三万元以上三十万元以下罚款15.药芯焊丝CO2气体保护焊属于()保护。
高压电工实操k3试题及答案
高压电工实操k3试题及答案一、单选题(每题2分,共30分)1. 高压电工作业中,下列安全措施不正确的是:A. 佩戴绝缘手套B. 使用绝缘工具C. 配戴安全帽D. 系牢安全带答案:D2. 在高压设备绝缘被打破时,应立即:A. 使用打火机进行紧急修补B. 将设备接地C. 直接进行维修D. 报告上级主管人员答案:B3. 高压变电站的交流电压水平主要按照下列哪种分类方法进行划分?A. 1000V以下B. 1000V~10kVC. 10kV~35kVD. 35kV及以上答案:C4. 高压设备的操作人员应具备的基本素质包括下列哪些?A. 具备高低压电设备操作证B. 熟悉设备工作原理C. 掌握相关安全操作规程D. 健康状况良好答案:B、C、D5. 在高压设备进行维修时,下列哪种做法是错误的?A. 进行漏电检测B. 使用合适的工具C. 单人操作D. 依据工作流程进行答案:C二、判断题(每题2分,共20分)1. 高压电工作业前应进行漏电检测。
答案:正确2. 高压设备操作人员在工作中应穿戴完整的工作防护用品。
答案:正确3. 高压变电站的运维人员必须接受相关岗位培训并持证上岗。
答案:正确4. 高压设备的维修应由专业人员进行。
答案:正确5. 高压设备损坏后,可以不立即报告上级主管人员。
答案:错误三、简答题(每题10分,共30分)1. 请简要说明高压电工作业中的“五不离”原则。
答:高压电工作业中的“五不离”原则包括:不离规定装备、不离可靠信号、不离安全程序、不离重要位置、不离任务要求。
2. 高压设备的楼梯、平台、设备间距等地方存在哪些安全隐患?应如何防范?答:高压设备的楼梯、平台、设备间距等地方存在的安全隐患主要包括缺乏防滑措施、设备摆放不规范、无安全护栏等。
防范措施包括安装防滑垫、设立安全警示标识、加强设备摆放管理,确保设备间距符合安全要求,设置合适的安全护栏等。
3. 高压电工作业过程中,如何正确操作断路器进行带电作业?答:正确操作断路器进行带电作业的步骤包括:首先,检查断路器的状态和工作正常与否;然后,使用绝缘手套和工具进行操作,确保与高压部分绝缘隔离;在操作过程中,确保自身安全,并根据作业需要进行合适的开合操作;最后,检查操作后断路器的状态,确认是否恢复正常。
2023年电工高级等级证三级模拟卷1
电工高级等级证(三级)模拟卷1一、单选题1、中性点直接接地系统中发生单相接地时,非故障相对地电压会( )。
A.不变B.上升C.降低2、在分析用户的负荷率时,选一天24h中负荷最高的一个小时的( )作为高峰负荷。
A.计算负荷B.最大负荷C.平均负荷3、变压器空载合闸时,( )产生较大的冲击电流。
A.会B.不会C.很难4、变压器匝数多的一侧电流小,电压( )。
A.高B.低C.不确定5、当频率为f的沟通电源电压加到一、二次侧绕组匝数分别为N1、N2的变压器的一次绕组后,一次侧绕组中的感应电势为( )。
A.E1=4.44fN1mB.E1=4.44fN2mC.E1=2.22fN1m6、远距离输送电能时,首先要将发电机的输出电压通过升压变压器上升到几万伏或几十万伏,以减小输电线上的( )。
A.电阻B.能量损耗C.电感7、绕组Yy联接的三相变压器的二次侧的额定电压等于( )。
A.变压器额定容量除以一次侧额定相电流的3倍B.变压器额定容量除以二次侧额定电流的根号2倍C.变压器额定容量除以二次侧额定电流的根号3倍8、在单相变压器的两个绕组中,输出电能的一侧叫做( )。
A.一次侧绕组B.二次侧绕组C.高压绕组D.低压绕组9、变压器二次绕组短路,一次绕组施加电压使其( )达到额定值时,变压器从电源吸取的功率称为短路损耗。
A.电流B.电压C.电阻10、容量在( )的变压器,且无人值班的,每周应巡察检查一次。
A.330kVA及以上B.430kVA及以上C.630kVA及以上11、在变压器( )带负载时的调压称为有载调压。
A.一次侧B.二次侧C.高压侧12、仪用互感器包括电压互感器和( )两种。
A.电流互感器B.自耦变压器C.降压变压器13、KYN××800-10型高压开关柜的专用摇把顺时针转动矩形螺杆时,使小车( )。
A.接地B.向前移动C.向后移动14、隔离开关型号为GW5-35/2000,含义是( )。
2023年电工高级等级证三级模拟试卷2
电工高级等级证(三级)模拟试卷2一、单选题单项选择题(每小题2分,共80分)1、在VVVF调速系统中,调频时须同时调整定子电源的( ),在这种状况下,机械特性平行移动,转差功率不变。
A.电抗B.电流C.电压D.转矩2、变频调速系统在基频以下一般采纳( )的掌握方式。
A.恒磁通调速B.恒功率调速C.变阻调速D.调压调速3、若增大SPWM逆变器的输出电压基波频率,可采纳的掌握方法是( )。
A.增大三角波幅度B.增大三角波频率C.增大正弦调制频率D.增大正弦调制波幅度4、通用变频器的滤波电路采纳( )滤波。
A.大电感B.大电容C.大电抗D.大电感或大电容5、一般变频器的电压级别分为()。
A.100V级与200V级B.200V级与400V级C.400V级与600V级D.600V级与800V级6、步进电动机的功能是( )A.测量转速B.功率放大C.把脉冲信号转变成直线位移或角位移D.把输人的电信号转换成电动机轴上的角位移或角速度7、步进电动机是通过( )打算转角位移的一种伺服电动机。
A.脉冲的宽度B.脉冲的数量C.脉冲的相位D.脉冲的占空比8、步进电动机驱动电路般可由( )、功率驱动单元、爱护单元等组成。
A.脉冲发生掌握单元B.脉冲移相单元C.触发单元D.过零触发单元9、在步进电动机驱动电路中,脉冲信号经( )放大器后掌握步进电动机励研绕组。
A.功率B.电流C.电压D.直流10、PLC是在( )基础上进展起来的。
A.电气掌握系统B.单片机C.工业计算机D.机器人11、PLC与继电掌握系统之间存在元件触点数量、工作方式和( )差异。
A.使用寿命B.工作环境C.体积大小D.接线方式12、世界上公认的第一台PLC是( )年美国数字设备公司研制的。
A.1958C.1974D.198013、在调速系统中为了获得挖土机特性,可以引入( )。
A.电压负反馈B.电压微分负反馈C.电流正反馈D.电流截止负反馈14、带有速度、电流双闭环的调速系统,在启动、过载或堵转状况下( )。
新版精编2020年城市电动列车检修工理论知识三级模拟考试题库598题(含答案)
2020城市电动列车检修工理论知识三级题库598题(含参考答案)一、单选题1.以下(D)由KLIP收集。
(A)受电弓的状态信号(B)接触器控制信号(C)ATO给定的参考值(D)以上都是2.(D)由SIBAS KLIP控制。
(A)自动驾驶转换继电器(B)ATP启动继电器(C)ATP切除指示灯(D)8节/6节编组继电器3.逆变器紧急启动的状况下,由逆变器应急电池供电,受电弓工作控制阀和升弓继电器的得电状况为(C)。
(A)升弓继电器先得电,受电弓工作控制阀后得电(B)受电弓工作控制阀先得电,升弓继电器后得电(C)同时得电(D)同时失电4.受电弓工作控制阀得电的条件是升弓继电器(A)。
(A)得电(B)失电(C)不明(D)以上都不对5.了停车制动,每节车单独执行WSP,WSP包括车轮防滑控制系统的(D)。
(A)自监视(B)故障检测(C)相互监视(D)A+B6.除了停车制动,每节车(A)执行WSP,WSP包括车轮防滑控制系统的自监视和故障检测。
(A)单独(B)同时(C)逐一(D)以上都不是7.节车装有一个压力传感器,仅在静止时BECU读取该传感器的信号。
如果传感器发生故障,将使用(A)。
(A)预先设置的负载信号默认值(B)最后一次负载信号的值(C)AW0时的负载信号值(D)AW1时的负载信号的值8.每节车装有一个压力传感器,仅在(A)BECU读取该传感器的信号。
如果传感器发生故障,将使用预先设置的负载信号默认值(A、B、C车数值相同)。
(A)列车0速时(B)速度为12kM/h时(C)速度为30kM/h时(D)速度为60kM/h时9.车施加常用制动时,而(A)发生故障的动车当作拖车处理。
(A)电制动(B)反馈制动(C)停车制动(D)常用制动10.车施加常用制动时,每个BECU评估来自列车的所有制动信号,电制动有优先权,由于电制动负载较高制动力缺少,由(A)补充。
(A)气制动(B)反馈制动(C)电阻制动(D)常用制动11.要使用按落弓按钮来实现落弓操作,须满足紧急停车继电器(A)的条件。
2023年三级安全评价师考试-专业能力模拟试题5
2022年三级安全评价师考试-专业能力模拟试题5姓名年级学号题型选择题填空题解答题判断题计算题附加题总分得分评卷人得分一、问答题二、单项选择题1.反应系统在外界影响下的稳定性、强壮性的是()。
A.可控性B.可观测性C.鲁棒性√D.控制精度2.为科研、医疗、制造药物或者防护目的需要生产()的,应当报国务院化学工业主管部门批准。
A.第一类监控化学品√B.第二类监控化学品C.第三类监控化学品D.第四类监控化学品3.激光属于()。
A.电离辐射B.非电离辐射√C.热辐射D.光辐射4.根据《安全预评价导则》的要求,安全预评价划分评价单元时的内容不包括()。
A.可按组织机构设置、人员管理、物料管理划分单元B.在应急救援管理等方面提出安全管理对策措施C.周边环境适应性和应急救援的有效性√D.在总图布置、功能分布、工艺流程、设施、设备、装置等方面提出安全技术对策措施5.将具有共性危险因素和有害因素的场所和装置划为一个评价单元的是()。
A.综合评价单元B.共性评价单元√C.个别评价单元D.一般评价单元6.事故树分析评价法属于()。
A.定量评价法B.概率风险评价法√C.伤害(或破坏)范围评价法D.危险指数评价法7.()适用于系统的事故模型和初值与边值比较确定的评价系统。
A.定量评价法B.概率风险评价法C.伤害(或破坏)范围评价法√D.危险指数评价法8.下列不属于安全评价方法的确定原则的是()。
A.充分性原则B.科学性原则√C.系统性原则D.适应性原则9.在实际生产条件中,将能预料到将来某个时候会发生事故的分值规定为()。
A.1B.3C.5D.10 √10.以下各种评价方法中,属于定性评价方法的是()。
A.事件树分析法B.故障树分析法C.作业条件危险性评价法√D.危险指数评价法11.以下说法不合适的是()。
A.风险评价方法不是一个单一的、确定的分析方法B.在选择风险评价方法时,应选择最佳的评价方法√C.风险评价方法并不是决定风险评价结果的唯一因素D.风险评价方法的选择依赖于评价人员对评价方法的不断了解和实际评价经验12.()是根据事故的数学模型,应用计算数学方法,求取事故对人员的伤害范围或对物体的破坏范围的安全评价方法。
2023年三级安全评价师考试-专业能力模拟试题4
2022年三级安全评价师考试-专业能力模拟试题4姓名年级学号题型选择题填空题解答题判断题计算题附加题总分得分评卷人得分一、单项选择题1.以下()项不是通过预先危险分析能达到的目的。
A.大体识别与系统相关的主要危险B.鉴别产生危险的原因C.预测事故出现对人体及系统产生的影响D.审查维护和安全检查是否充分√2.在外界的力量作用下,系统中的元素呈()排列状态。
A.无序B.混乱C.静止D.规则√3.安全评价方法的确定过程的一般步骤是()。
A.分析被评价系统、分析安全评价方法、明确有关数据和资料、收集安全评价方法、确定安全评价方法B.分析被评价系统、明确有关数据和资料、收集安全评价方法、分析安全评价方法、确定安全评价方法C.分析安全评价方法、明确有关数据和资料、收集安全评价方法、分析被评价系统、确定安全评价方法D.分析被评价系统、收集安全评价方法、分析安全评价方法、明确有关数据和资料、确定安全评价方法√4.能对人造成伤亡或对物造成突发性损害的因素是()。
A.有害因素B.危险因素√C.损害因素D.风险因素5.下列关于提出评价需求信息的说法中,正确的是()。
A.安全信息的核心是“危险识别”、“隐患控制”和“事故隐患”B.“能量流”通过“信息流”产生的信息为安全评价的“危险识别”提供依据√C.“管理流”通过“信息流”产生的信息可为安全评价提供依据D.有了危险和有害因素“失控”构成“事故隐患”的信息,根据信息反馈控制的理论,要在“能量流”上加强控制6.下列不属于矿山安全生产条件合格证要求的是()。
A.安全设施投入符合安全生产要求B.每个矿山必须持有国土资源部颁发的《采矿许可证》,并且一矿一证C.必须建立健全安全生产责任制和安全管理制度以及各工种的岗位操作规程D.必须配备与本企业生产相适应的专职或兼职安全生产管理人员,并经培训考核合格√7.下列关于定量安全评价方法中伤害范围评价法的说法,错误的是()。
A.伤害范围评价法是根据事故的数学模型,应用计算数学方法,求取事故对人员的伤害范围或对物体的破坏范围的安全评价方法B.伤害范围评价法是应用数学模型进行计算,只要计算模型以及计算所需要的初值和边值选择合理,就可以获得可信的评价结果C.评价结果是事故对人员的伤害范围或对物体的破坏范围,评价结果直观、可靠D.伤害范围法的评价结果可用于危险性分区,但不可用于计算伤害区域内的人员及其人员的伤害程度√8.下列不属于评价单元的方式对策措施的是()。
2023届湖南省株洲市高三下学期适应性模拟考试(三模)物理核心考点试题
2023届湖南省株洲市高三下学期适应性模拟考试(三模)物理核心考点试题一、单项选择题(本题包含8小题,每小题4分,共32分。
在每小题给出的四个选项中,只有一项是符合题目要求的)(共8题)第(1)题2020年爆发了新冠肺炎,该病毒传播能力非常强,因此研究新冠肺炎病毒株的实验室必须全程都在高度无接触物理防护性条件下操作。
武汉病毒研究所是我国防护等级最高的P4实验室,在该实验室中有一种污水流量计,其原理可以简化为如图所示的模型:废液内含有大量正、负离子,从直径为d的圆柱形容器右侧流入,左侧流出。
流量值Q等于单位时间通过横截面的液体的体积。
空间有垂直纸面向里的磁感应强度为B的匀强磁场,下列说法正确的是( )A.带电粒子所受洛伦兹力的方向水平向左B.正、负粒子所受洛伦兹力的方向是相同的C.污水流量计也可以用于测量不带电的液体的流速D.只需要测量M、N两点间的电压就能够推算废液的流量第(2)题取一支按压式圆珠笔,将笔的按压式小钢帽朝下按压在桌面上,如图所示。
将手放开后,笔会向上弹起一定的高度,忽略一切阻力。
下列说法正确的是( )A.当笔刚要离开桌面时,笔的速度达到最大B.从笔开始运动到最高点,笔做匀变速直线运动C.从笔外壳与内芯碰撞结束到笔运动到最高点,笔的机械能守恒D.从笔开始运动到笔刚要离开桌面,桌面对笔的作用力对笔做正功第(3)题如题图所示,有一不带电的金属球壳,在其中心O点处放置一正点电荷,M、N、P、Q点在一条过O点的直线上,P点与N点关于O点对称,Q点位于金属内部,M点位于球壳外部。
当金属球壳处于静电平衡状态时,( )A.M、N点电势相等B.Q点的电场强度不为零C.电子从N点运动到P点的过程中电场力所做总功一定为正D.Q点的电势高于M点的电势第(4)题下列物理量是矢量,且单位正确的是( )A.动量kg·m/s B.电势能JC.加速度m/s D.电荷量C第(5)题如图所示,某行星绕太阳运行的轨道为椭圆,该行星在近日点A受到太阳对它的万有引力为,在远日点B受到太阳对它的万有引力为。
2023届山东省淄博市高三下学期第三次模拟测试物理核心考点试题(基础必刷)
2023届山东省淄博市高三下学期第三次模拟测试物理核心考点试题(基础必刷)一、单项选择题(本题包含8小题,每小题4分,共32分。
在每小题给出的四个选项中,只有一项是符合题目要求的)(共8题)第(1)题某科研小组设计一款超重报警装置,其结构原理图如图所示,主体是导热性能良好的薄壁密闭容器,厚度和质量不计的活塞通过轻杆连接轻质平台。
平台上未放重物时,内部封闭理想气体气柱长度;当活塞进入预警区域时,系统会发出超重预警。
横截面积,底部的预警区域深度,平台上轻放质量为的重物稳定时,活塞刚好触动报警装置。
已知环境温度不变,大气压强,,不计摩擦阻力,下列说法正确的是()A.重物的质量B.重物的质量C.放上重物至活塞最终稳定的过程中,密闭气体对外界放出的热量为D.放上重物至活塞最终稳定的过程中,密闭气体对外界放出的热量为第(2)题密立根油滴实验装置如图所示,两块水平放置的金属板分别与电源的正负极相接,板间产生匀强电场。
用一个喷雾器把密度相同的许多油滴从上板中间的小孔喷入电场,油滴从喷口喷出时由于摩擦而带电。
金属板间电势差为U时,电荷量为q、半径为r的球状油滴在板间保持静止。
若仅将金属板间电势差调整为2U,则在板间能保持静止的球状油滴所带电荷量和半径可以为( )A.q,r B.2q,r C.2q,2r D.4q,2r第(3)题如图甲所示,为一梯形平台截面图,OP为粗糙水平面,PD为斜面,小物块置于粗糙水平面上的O点,每次用水平拉力F将物块由O点从静止开始拉动,当物块运动到斜面顶端P点时撤去拉力。
小物块在大小不同的拉力F作用下落在斜面上的水平射程x不同,其F-x图如图乙所示,若物块与水平面间的动摩擦因数为0.4,斜面与水平地面之间的夹角,g取10m/s2。
设最大静摩擦力等于滑动摩擦力,则下列说法中正确的是( )A.小物块每次落在斜面上的速度方向不同B.不能求出小物块质量C.小物块质量m=1.0kgD.O、P间的距离S=0.625m第(4)题如何堆放重物件常是建筑工人需要考虑的问题。
最新2023年河南省平顶山市中考物理三模试题附解析
2023年河南省平顶山市中考物理三模试题学校:__________ 姓名:__________ 班级:__________ 考号:__________注意事项:1.答题前填写好自己的姓名、班级、考号等信息2.请将答案正确填写在答题卡上一、单选题1.两滴水银接近时能自动结合为一滴较大的水银滴,这一现象说明:()A.分子间存在引力B.分子间存在斥力C.分子间有间隙 D.物质间有扩散现象2.如图所示,将体积相同的物体G1、G2分别挂在杠杆的两端,杠杆处于平衡状态。
若将两个物体G1、G2同时浸没在水中,则......................................................................................................... ()A.杠杆仍能保持平衡B.杠杆不能平衡,A端下沉C.杠杆不能平衡,B端下沉D.无法确定杠杆的状态3.亮亮根据“分类法”将下列杠杆分成了四组,其中属于省力杠杆一组的是 ....... ()A.活塞式抽水机的手柄;起子; B.钓鱼竿;道钉撬;C.天平;理发剪; D.筷子;剪铁皮的剪子。
4.在如图所示的简单机械中,属于费力杠杆的是....................................................... ()5.下列哪个单位不是长度的单位....................................................................................... ()A.m B.光年C.cm D. cm26.在下面几种情况中,不是机械运动的是:()A.行驶中的火车; B.在轨道上运行的人造通讯卫星;C.地球的公转; D.水的蒸发.7.用了多年的铅球,其表面磨损了一些,未发生变化的是铅球的........................... ()A.质量B.体积C.表面积D.密度8.一定量的冰熔化成水,在此过程中,下列说法正确的是:()A.密度不变,体积变大; B.密度变小,体积增大;C.密度变大,体积变小; D.密度不变,体积变小.9.下列关于电磁铁的说法中,正确的是()A .电磁铁是永久磁铁B .电磁铁是应用电磁感应原理制成的C .电磁铁的磁性强弱只与线圈匝数有关D .电磁铁的铁芯是用软磁性材料制成的10.小明在研究“并联电路”特点时,用电流表测得通过灯泡L 1、L 2中的电流分别为1A 和2A ,则下列分析正确的是 ................................................................................................ ( )A .干路电流为3AB .L 1的电阻小于L 2的电阻C .L 1两端的电压小于L 2两端的电压D .并联电路中各支路电流一定不同11.一个人以1m/秒的速度向竖直悬挂的平面镜靠近,他在镜中的像是 ...................... ( )A .以1m/秒的速度向他靠近B .以1m/秒的速度远离镜面C .以2m/秒的速度向他靠近D .以2m/秒的速度远离镜面12.下列图所示的电器工作时,与电磁波应用有关的是:( )二、多选题13.根据密度公式ρ=m V可知:( ) A .密度与质量成正比;B .密度与体积成反比;C .同种物质的质量与体积成正比;D .密度等于某种物质的质量与体积的比值.三、填空题14.吸烟有害健康,吸“二手烟”危害更大,因此公共场所通常有“禁止吸烟”的标志,如图所示。
2023年中考化学第三次模拟考试卷及答案解析(济南卷)
2023年中考化学第三次模拟考试卷及答案解析(济南卷)第Ⅰ卷40分一、选择题(本大题共10小题,每小题2分,共20分。
在每小题给出的四个选项中,只有一个选项是符合题目要求的)1.我国科技飞速发展,近年来在众多方而取得了新突破,下列过程属于化学变化的是()A.开采深海可燃冰B.把光存储1小时C.天问一号发射升空D.碲化镉薄膜光能发电【答案】C【解析】A、开采可燃冰,无新物质生成,属于物理变化,错误;B、把光存储1小时,无新物质生成,属于物理变化,错误;C、火箭发射,有燃烧过程,属于化学变化,正确;D、碲化镉薄膜光能发电过程无新物质生成,属于物理变化,错误。
2.2023年世界环境日中国主题是“建设人与自然和谐共生的现代化”。
下列做法符合这一主题的是()A.用工业废水直接灌溉农田B.尽量多用农药化肥提高粮食产量C.研制可降解塑料D.大力发展火力发电,满足工业发展用电需求【答案】C【解析】A、工业废水中含有有毒、有害物质,直接灌溉农田会污染土壤,错误;B、大量使用化肥和农药会对作物产生不良影响,应该合理使用化肥和农药,错误;C、研制可降解塑料可以减少白色污染的产生,正确;D、大力发展火力发电,会增加污染物的排放,加剧环境恶化,错误。
3.“关爱生命,拥抱健康”是永恒的主题。
下列叙述错误的是()A.二氧化碳有毒性,空气中超过正常含量时会引起中毒B.饮食中缺乏碘元素容易引起甲状腺肿大C.正确使用含氟牙膏可以预防龋齿D.人体摄入过多的油脂后,容易引发肥胖和心脑血管疾病【答案】A【解析】A、二氧化碳本身没有毒性,但不能供给呼吸,当空气中二氧化碳含量超过正常含量时,就会对人体健康产生影响,浓度大时甚至会使人室息死亡,错误;B、饮食中缺乏碘元素容易引起甲状腺肿大,正确;C、氟能防治龋齿,正确使用含氟牙膏可以预防龋齿,正确;D、人体摄入过多的油脂后,容易引发肥胖和心脑血管疾病,应适量食用油脂类食物,正确。
4.化学实验是学习化学的重要途径,也是形成科学探究素养的必要手段。
青少年机器人等级考试三级理论试卷(模拟一)
3、串联电路中,保持电路中电流不变,加大电路中的电阻,电路两 端电压会如何变化? A、不变 B、变大 C、变小 D、不确定
4、半导体三极管是有? A、—个 PN 结组成 B、二个 PN 结组成 C、三个 PN 结组成 D、四个 PN 结组成
5、四节普通干电池并联后的电压为? A、1.5V B、3V C、4.5V D、6V
26、二极管之所以被称为“半导体”,是因为它具有什么特性? A、有两个引脚 B、双向导电性 C、单向导电性 D、导电性
27、二极管的导通条件是所给电压 U 要满足( ) A、U>0
B、U>截止电压 C、U>导通电压 D、U>击穿电压 28、一个并联电路,并联了 3 个灯泡,测得电源两边的电压为 3V, 则通过每个灯泡的电压为() A、3V B、1V C、6V D、9V
10、关于电流下列说法正确的是? A、两个电阻串联通电,电阻越大的通过的电流越大 B、电路两端电压固定,电流随电阻的増大而减小 C、并联电路中的电流相等 D、电路中电阻不变,随电压塔大,电流减小
11、半导体二极管的待性是具有?
A、电流放大作用 B、电压放大作用 C、单向导电性 D、双向导电性
12、或门电路输入 1 和 0 ,会输出()。 A、1 B、0 C、先输出 1 后输出 0 D、先输出 0 后输出 1
青少年机器人等级考试三级理论试卷 (模拟一)
一、选择题(共 36 题)
1、 A、将数字数字管脚 A0 设为低电平 B、将模拟管脚 A0 设为高电平 C、将数字管脚 A0 设为高电平 D、将模拟管脚 A0 设为低电平
该模块可以实现的功能是?
2、下列物体中全属于绝缘体的是? A、人体、铁块 B、铁块、陶瓷 C、常温下的玻璃、陶瓷 D、人体、常温下的玻璃
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2012 KP3 Mock TestExam Duration: 2 hoursExam Content: 4 Parts--Listening, English in Use, Reading, and WritingExam Instruction: Please answer all the questions in the exam paper and fill in the corresponding boxes on the answer sheet.Part 1 listening (25 points in total)Section A (1 point each)Questions 1-8Listen to the conversation between two friends. Complete multiple choices below. Circle the correct answer from choices A-D.1. She thought the holiday was(A) good and really cheap. (B) great but expensive(C) okay but really expensive. (D) fantastic and really cheap.2. She went to(A) France (B) America(C) Germany (D) England3. Where does the Queen live?(A) In Buckingham Palace (B) In Blenheim Palace(C) In Boddingtons Palace (D) In Bedfordshire Palace4. The soldiers wear(A) big black hats and red clothes. (B) small black hats and red clothes(C) big black hats and black clothes. (D) big black hats and ride horses5. The hats are made from(A) foxes (B) rabbits(C) bears (D) deer6. The museums are(A) very expensive (B) very cheap(C) usually cheap (D) usually free7. Her favourite dish was(A) apple mumble (B) apple crumble(C) apple fumble (D) apple jumble8. She stayed in(A) an expensive hotel (B) a cheap hotel(C) university accommodation (D) a really cheap youth hostel.Section C (1 point each)Direction: Listen to the dialogue on the tape, and fill in the gaps 1-5, and answer the questions 6-10.The man: You must be pretty excited about your trip to (1) ____________. When is it that you are leaving?The woman: In just (2) _________________, and I am excited. But there are still a few things I need to do before I go.The man: Like what?The woman: Like (3) ______________________, going to the (4) __________________ to buy my plane ticket and figuring out what to do with(5) _____________________ while I’m gone.(6) Will the woman going to find another apartment after the trip?(7) What idea does she not like either?(8) What’s the man’s suggestion about the apartment?(9) How long will Jim Thomas stay for some research this summer?(10) When is the man going to call Jim?Part 2 English in Use (25 points in total)Section 1 Multiple Choices (1 point each)1. – Have you finished reading Jane Eyre?-- No, I ____ my homework all day yesterday.A. was doingB. would doC. had doneD. do2. The little boy won’t go to sleep _____ his mother tells him a story.A. orB. unlessC. butD. whether3. – I haven’t got the reference book yet, but I’ll have a test on the subject next month. -- Don’t worry. You _____ have it by Friday.A. couldB. shallC. mustD. may4. If you plant watermelon seeds in the spring, you _____ fresh watermelon in the fall.A. eatB. would eatC. have eatenD. will be eating5. Computers and mobile phones, though they are indeed making our life ______ and more _____, have reduced the need for face-to-face communication.A. easily; efficientB. easy, efficientC. easy; efficientlyD. easily; efficiently6. Today, we will begin ____ we stopped yesterday so that no point will be left out.A. whenB. whereC. howD. what7. Every few years, the coal workers _____ their lungs X-rayed to ensure their health.A. are havingB. haveC. have hadD. had had8. The book has been translated into thirty languages since it ____ on the market in 1973.A. had comeB. has comeC. cameD. comes9. For many years, people ______ electric ears. However, making them has been more difficult than predicted.A. had dreamed ofB. have dreamed ofC. dreamed ofD. dream of10. He was told that it would be at least three more months _____ he could recoverand return to work.A. whenB. beforeC. sinceD. thatSection 2 Cloze (1 point each)Direction: Complete the following passage by using the words in the box. Each word can only be used once. Note that there is one word more than you need.Frederick Douglass was an escaped slave in the movement that fought to end slavery in the United States. He became a __1__ voice in the years before the Civil War.A few weeks ago, the National Park Service (NPS) ___2____ Douglass’s birth and Black History Month with the reopening of his home at Cedar Hill, a __3___ site in Washington, D.C. The two-story house, which contains many of Douglass’s personal possessions, had undergone a three-year ___4___. (Thanks to the NPS website, however, you don't have to live in the nation’s capital to visit it. Take a tour online.)He was born Frederick Augustus Washington Bailey to a slave mother and a white fatherhe never knew. Douglass grew up to become the first black __5___ to hold a government office – as US minister and consul general to Haiti.As a youth, he never went to school. Educating slaves was illegal in the South, so he __6___ taught himself to read and write. At 21 years old, he escaped from his slave owner to Massachusetts and changed his last name to Douglass, to hide his identity.In the 1850s, Douglass was involved with the Underground Railroad, the system set up by antislavery groups to bring runaway slaves to the North and Canada. His home in Rochester, N.Y. was near the Canadian border. It became an important station on the ___7___, housing as many as 11 runaway slaves at a time.He died in 1895. In his lifetime, Douglass witnessed the end of slavery in 1865 and the ___8___ of the 15th Amendment to the US Constitution, which ___9___ African-American the right to vote.Part 3 Reading (20 points in total)Passage 1You should spend about 20 minutes on Questions 1-10, which are based on Reading Passage 1 below.Apply for a Tax File NumberEveryone who receives any income in Australia needs a T ax File Number. Income includes wages or salary from a job, money earned from investments, and government payments.Register with MedicareThe Australian Government provides help with medical expenses through a scheme called Medicare. You may be eligible to join Medicare and gain immediate access to health-care servicesand programs such as free public hospital care, help with the cost of out-of-hospital care and subsided medicines. To register with Medicare, you should wait appropriately ten working days after your arrival in Australia and then go to a Medicare office, listed in thetelephone book, with your passport or travel documents. If you need to see a doctor urgently, you can register with Medicare without waiting ten days. Medicare has a Welcome Kit which is translated into 16 different languages. It explains Medicare and other government health services and the eligibility requirements for benefits and payments. This booklet is available from Medicare offices or you can read it on the Internet.Open a bank accountPeople in Australia usually keep their money in a bank, building society or credit union. It is advisable to open a bank account within six weeks of your arrival, as during this time you usually need only your passport as identification. After six weeks, you will need additional identification to open an account.Register with CentrelinkNewly arrived residents can register with the government agency called Centrelink to get help with looking for work, having overseas skills recognised and accessing relevant courses. Centrelink also has an application form for Tax File Numbers and can assist you to lodge your application with the Tax Office, so that access to any payments is not delayed.Register for English ClassesEnglish language courses for new arrivals in Australia are provided under the Adult Migrant English Program. As a new resident, you may be entitled to receive free English language tuition of up to 510 hours.Get a driv er’s licenceIf you are a permanent resident visa holder and have a current driver’s licence from another country, in English or with an official translation, you are allowed to drive for your first three months after arrival. After that, if you want to drive, you will need to have the appropriate Australian driver’s licence. To get one, you usually need to pass a knowledge test, a practical test, and an eyesight test. Licences from some overseas countries do not require a practical test.Question 1-6Instruction: Read the passage. Do the statements below agree with the information given in the passage? WriteTrue if the statement agrees with the informationFalse if the statement contradicts the information1). A Tax File Number is only required by people who are working.2). All health-care services are free for people registered with Medicare.3).If you open a bank account in your first six weeks in Australia, you will probably need fewer documents than later on.4). Centrelink can help you to get your qualifications accepted officially.5). English language lessons are offered at no cost to all new residents who require them.6). Whether or not you need to take an Australian practical test for a driver’s licence depends on which country you come from.Questions 7-10Instruction: Complete the following sentences with words taken from the passage. Write NO MORE THAN THREE WORDS AND/OR A NUMBER for each answer.7) The address of the nearest Medicare office can be found in a _________.8) Centrelink can help you with your _________ for payments from the Tax Office.9) The Adult Migrant English Program offers a maximum of _________ of Englishlessons.10) All foreign drivers’ licences can be used for _________ without taking any part of theAustralian driving test.Passage 2LIFE SUCCESS AND SATISFACTION1. Life satisfaction, which can be defined as general happiness or well being, isrelated to several demographic and personal qualities. The factor of age is important because the elements that make up life satisfaction may differ from one age to the next. Income is more likely to predict life satisfaction among middle-aged and older adults than among young adults. Health is a more significant predictor of happiness among older adults than among the young or the middle-aged. However, average levels of life satisfaction do not change significantly with age. Generally speaking, older adults are as satisfied with their lives as are younger or middle-aged adults. 2. There is no single element that guarantees high life satisfaction for everyonewho possesses it. Happiness seems to consist of many things that each person weighs differently, such as income, education, work, and relationship. However, certain factors are reliable predictors of life satisfaction. One such predictor is health, especially one’s perception of one’s own health rather than a doctor’s objective health assessment. Another predictor of life satisfaction is a feeling of being in charge of one’s own life and a sense of authority over one’s own decisions. Adults who feel that they have some choices and options are generally happier than those who feel that their lives are controlled by others or by fate or chance. For example, older adults who experience financial strain feel less life satisfaction mainly because the problem signals a loss of control over their lives.3. The largest predictor of life satisfaction appears to be the adequacy of socialrelationships, especially marriage and family relationships. The perceived quality rather than the quantity of social interactions is most strongly related to happiness.Satisfaction with one’s close personal relationships is more closely linked to overall life satisfaction than either demographic factors or satisfaction with other key aspectsof adult life such as occupation. This is true even among highly educated men, who typically have a very high commitment to their work. The quality of social support available in one’s key relationships affects the ability to handle stress and life changes as well as one’s ongoing level of life satisfaction.4. Studies suggest that family background and early-adulthood resources arepredictors of psychological health or success at midlife. People who age well are those who start out well. One study showed that the happiest and most successful middle-aged adults and grown up in warm, supportive, intellectually stimulating families. Well-adjusted or successful middle-aged adults began adulthood with more personal resources, including better psychological and physical health at college age.They also had been practical and well organized in college and had shown greater intellectual competence.5. However, no measure of early family environment or early-adult competenceremained a significant predictor of psychological well being at the end of middle age.One study of men revealed that at the age of 65, there were no childhood or early-adulthood characteristics that distinguished between men who had turned out well and those who had not. However, what did predict success and well being at age65 was the men’s health and adjustment at midlife. These results suggest that asuccessful adult life is not something preordained from childhood or early adulthood but rather something created out of the opportunities available over the course of one’s life. Late-life success is related more directly to midlife qualities or experiences.People who start out with certain advantages have a greater chance of experiencing further advantages; however, it is what one does with the experiences – both positive and negative – that determines long-term life satisfaction. The choices that people make in early adulthood help shape who they are at midlife, and those midlife qualities in turn influence who they become later in life.1. The phrase “in charge of” in paragraph 2 is closest in meaning toA. worried aboutB. responsible forC. lucky inD. controlled by2. The word “problem” in paragraph 2 refers toA. authorityB. fate or chanceC. financial strainD. less life satisfaction3. The word “adequacy” in paragraph 3 is closet in meaning toA. knowledgeB. appearanceC. memoryD. quality4. What point does the author make about the relationship of age to life satisfaction?A. Age is the primary factor in determining life satisfaction.B. The factors that determine life satisfaction are the same at every age.C. Average levels of life satisfaction are similar for every age group.D. Young adults are more satisfied with their lives than older adults are.5. According to the passage, all of the following are predictors of life satisfaction EXCEPTA. healthB. ageC. control of own lifeD. family relationships6. What can be inferred from paragraph 3 about social relationships?A. Close social relationships are likely to influence long-term health and happiness.B. People with good family relationships also have good social relationships at work.C. Highly educated people usually have many different kinds of social relationships.D. The number of social relationships is more important than the type of relationship.7. What does the author say about people who are well adjusted and successful at midlife?A. They are more satisfied with their lives than young adults are.B. They perceive themselves as successful even when it is not true.C. They are generally better adjusted than their parents were.D. They probably had positive personal qualities as young adults.8. Which sentence below best expresses the essential information in the underlined sentence in paragraph 5? (Incorrect choices change the meaning in important ways or leave out essential information).A. The most important predictors of psychological health do not change between early adulthood and midlife.B. Neither family background nor qualities of early adulthood can predict life satisfaction beyond middle age.C. Middle-aged people are likely to be well adjusted if their experiences as youngadults were mostly positive.D. There is no reliable way to measure the influence of family relationships on the mental health of older adults.9. Why does the author discuss a study of men in paragraph 5?A. To illustrate a point about satisfaction late in lifeB. To explain differences among men of different agesC. To emphasize the importance of family relationshipsD. To argue for more psychological studies about men10. It can be inferred from paragraph 5 that the author most likely believes which of the following about long-term life satisfaction?A. It is affected by the decisions made throughout adulthood.B. It is measured differently for men and for women.C. It is directly related to having advantages during childhood.D. It is purely the result of chance and cannot be predicted.Part 4 writing (30 points)Direction: Please read the following argument and write an article of no less than 200 words:。