浙江省杭州市文澜中学2016-2017学年八年级上学期期末考试科学试卷【无】

浙江省杭州市文澜中学2016-2017学年八年级上学期期末考试科学试卷【无】
浙江省杭州市文澜中学2016-2017学年八年级上学期期末考试科学试卷【无】

文澜中学2016学年第一学期期末考试初二科学试卷

注意:本卷g=10牛/千克

一、选择题(每小题2分,共50分)

1.下列属于气候现象的是()

A.冬暖夏凉B.雷电交加C.和风细雨D.晴空万里

2.下列属于反射活动的是()

A.衣藻避开过强的阳光刺激B.草履虫向水温适宜的地方运动

C.在寒冷的条件下,皮肤血管收缩D.皮肤受到过热物体刺激感到疼痛

3.下列装置中,不是利用大气压强工作的是()

A.用注射器注射药液B.吸管吸饮料C.吸盘挂钩D.吸尘器

4.下列腺体中,不属于内分泌腺的是()

A.平状腺B.唾液腺C.垂体D.卵巢

5.下列混合物属于是浊源是()

A.早餐时喝的“牛奶”B.洗衣服用的“肥皂水”

C.消毒用的“碘酒”D.肠胃病人“造影检查”时服用的“钡餐”

6.下列四个地区,水循环最活跃的是()

A.长江、黄河发源地区B.长江中下游地区

C.新疆沙漠地区D.南极冰川地区

7.如图,实验中的女生长发上扬,下列选项中,不属于保证该实验的必要条件是()

A.金属球壳必须带电

B.身体必须接触金属球壳

C.身体必须与金属球壳不断摩擦

D.身体与大地之间必须用绝缘材料隔离

8.下列条件中的氢氧化钙溶液,质量分数最大的是()

A.30C

°的饱和溶液

°的不饱和溶液B.30C

C.90C

°的饱和溶液

°的不饱和溶液D.90C

9.下列关于溶液的说法,正确的是()

A.不饱和溶液转化为饱和溶液时,其溶质的质量分数一定会增大.

B.饱和溶液中析出晶体后,其溶质的质量分数一定不变.

C.饱和溶液温度降低时,一定会有晶体析出.

D.饱和溶液恒温蒸发溶剂时,其溶质的质量分数一定不变.

10.有一位同学要试一试将注射器出药水的小孔封住时,拉出注射器活塞的力要多大.注射器容积为10

毫升,0到10毫升刻度线的距离为5厘米.他先把活塞推到底.再把注射器出药水的小孔封住后,要拉出活塞,所用的力大小约为)( ) A .2000牛 B .200牛 C .20牛 D .2牛

11.文澜中学教室里采用光控开关自动调节LED 灯的亮灭,对于教室里灯的亮度与总电阻及总电流的

关系,下列说法正确的是( )

A .亮着的灯越多,总电阻越大,总电流越大

B .亮着的灯越少,总电阻越小,总电流越小

C .亮着的灯越多,总电阻越大,总电流越小

D .亮着的灯越少,总电阻越大,总电流越小

12.在番茄上相隔一定距离分别插入铜片和锌片,即为番茄电池,将铜片、锌片与电压表相连,如图

所示,下列说法正确的是( )

A .锌电极是番茄电池的正极

B .番茄电池可将化学能转化为电能

C .番茄电池形成通路后,电子将从铜电极流出

D .将电压表直接接在该番茄电池上,会损坏电压表

13.如图,某同学将一细条状铝箔纸的两端分别压在干电池的正负极,发现铝箔纸发热并燃烧,关于

该实验的分析正确的是( )

A .实验时两节干电池的正极与正极相连

B .用普通纸代替铝箔纸也能燃烧

C .实验中铝箔纸没有发生化学变化

D .该实验能说明短路带来的危害

14.某正方形物块重为1G ,与它等体积的水重为2G ,将它浸没在密度为0.8克/3厘米的煤油中,受到

煤油向上和向下的压力差为( ) A .1G

B .2G

C .12G G -

D .20.8G

15.两个容器中分别盛有甲、乙两种不同的液体,把体积相同的A 、B 两个实心小球放入甲液体中,

两球沉底;放入乙液体中,两球静止时的情况如图乙所示,下列说法错误的是( )

A.小球A的质量小于小球B的质量

B.甲液体的密度小于乙液体的密度

C.在甲液体中小球A对容器底的压力小于小球B对容器底的压力

D.小球A在甲液体中排开液体的质量大于在乙液体中排开液体的质量

16.在水平桌面上有一个盛有水的容器,木块用细线系住没入水中(水未溢出),如图甲所示,将细线剪断,木块最终漂浮在水面上,且五分之二的体积露出水面,如图乙所示,下列说法正确的是()

A.甲、乙两图中,木块受到水的浮力之比是5:3

B.甲、乙两图中,水对容器底部的压强之比是1:1

C.甲图中细线对木块的拉力与木块受到的浮力之比是2:5

D.甲、乙两图中,容器对水平桌面的压强之比是5:3

17.如图所示是一种定时课间音乐播放装置的原理图.“播放器”是有电流通过时会播放音乐的装置:“定时开关”是达到设定时间自动断开的开关.闭合开关S,当“定时开关”处于闭合状态时,指示灯①_____(填“会”或“不会”)亮,播放器②____(填“会”或“不会”)播放音乐;到达设定时间,“定时开关”处于③____(填“闭合”或“断开”)状态.下列选项中正确的是()

A.①会②不会③断开B.①不会②会③闭合

C.①不会②会③断开D.①会②不会③闭合

18.在研究“一定电压下,电流与电阻的关系”时,电路如图所示,电源电压恒为3V,滑动变阻器上标有A

“151”字样.在a、b间先后接入不同阻值的定值电阻R,移动滑片P,使电压表示数为1.5V,W

读出电流表的示数,当20W的电阻接入a、b间时,电压表示数始终无法达到1.5V,其原因可能是()

A.电源电压3V太高B.20W的阻值太小

C.控制的电压1.5V太高D.滑动变阻器阻值太小

19.配制50克10%NaCl溶液,下列实验操作中,所得溶液质量分数可能大于10%的是()A.称量固体NaCl时,天平指针略向右倾斜

B.用天平称量固体NaCl时,固体放在右盘,砝码放在左盘

C.用量筒量取水时俯视读数

D.配制溶液时烧杯先用少量蒸馏水润洗

20.下列属于植物向性运动的是()

A.菊花在秋天开花B.某植物叶表面的气孔在白天打开,晚上关闭C.含羞草的小叶受到振动后合拢D.横倒在地上的蕃茄茎背地生长

21.用高压锅煮粥,熄灭后用冷水将锅冷却,拿去限压锅后打开锅盖,可以看到锅内的粥仍在沸腾,而普通锅却看不到这样的现象.对此,下列说法正确的是()

A.熄灭后,锅内温度迅速降到100C

°以下,但由于打开锅盖后气压降低,所以重新沸腾B.熄灭后,锅内温度仍高于100C

°,即使不冷却,不拿去限压阀,粥还在沸腾C.熄灭后,锅内温度仍高于100C

°,打开锅盖后气压比原来低,所以重新沸腾D.粥的流动性差,不易降温,熄灭后即使不浇冷水,不拿去限压阀,粥也要沸腾较长时间22.用体重相近,发育正常且程度相似的甲、乙、丙三个雄性小狗进行实验,甲不作处理,乙、丙分别切除某种内分泌腺,几个月后分别测定其血液中的激素含量,如下表所示(单位:微克/100ml血

激素名称甲乙丙

甲状腺激素30.1 2.8

生长激素6 5.80.1

A.甲在实验中起对照作用

B.乙切除的是甲状腺

C.丙切除的是垂体

D.手术后乙狗发育正常

23.小华同学为了探究串、并联电路中电流、电压的变化特点,他按照如图所示电路图连接电路.实验过程中,保持电源两端电压不变,闭合开关S,将滑动变阻器的滑片从中点向左移动,由此引起三块电表示数的变化情况是()

A.若①为电压表,②、③为电流表,则表①示数不变,表②、表③示数均变大

B.若①为电压表,②、③为电流表,则表②示数变小,表①、表③示数均不变

C .若①为电流表,②、③为电压表,则表③示数变小,表①、表②示数均不变

D .若①为电流表,②、③为电压表,则表③示数不变,表①、表②示数均变大

24.实际测量中使用的电流表、电压表都是由小量程电流计G 改装而成的,电流计G 也是一个电阻,

同样遵循欧姆定律.如图所示,已知小量程的电流计的内阻为120g R =W ,表头显示其满偏电流为2A g I m =.关于电表的改装,下列说法正确的是( )

A .将电流计改装成电压表,应在电流计两端并联适当的电阻

B .将电流计改装成电流表,应在电流计两端串联适当的电阻

C .将小量程的电流计改装为量程为100mA 的电流表,应并联30W 的电阻

D .将小量程的电流计改装为量程为100mA 的电流表,应并联30W 的电阻

25.如图是某种握力计的原理图,其中弹簧上端和滑动变阻器滑片固定在一起,0R 为保护电阻,握力

大小可通过电压表示数来显示,手握紧MN 时,握力越大电压表的示数越大,则下列电路中符合这一原理的是( )

A .

B .

C .

D .

二、填空题(33-36每空2分,其它每空1分,共38分)

26.如右图所示闭合电路中,金属导线AB 上定向移动着的自由电荷是______,它们的运动方向是______,AB 上的电流方向是_________.(选项“A →B ”或“B →A ”)

27.目前许多学校安装了直饮水机,直饮水机内有许多活性炭,活性炭的作用是_______.(选项序号)

A .杀毒消毒

B .吸附杂质

C .蒸馏

直饮水机使用方便:只要将它与自来水管网对接,截留清除水中的有害物质(如细菌等),使得

到直饮水.直饮水属于_______(选项“混合物”或“纯净物”).

28.下图是皮肤中同一血管在不同温度下的口径,试根据图回答下列问题

(1)上述三种情况中,环境温度最低的是_______.此时人们可以通过骨骼肌的颤抖使人体热量增

加;

(2)皮肤血管口径如图C 时,流经皮肤的血液量_______(填“增大”或“减少”),此时,人体主要

通过 _______散热

29.某同学在做“用电流表测电流”的实验中,所用电路如图甲所示,按电路图正确连接电路并接通开

关S 后,电流表1A 、2A 的示数如图乙,则1A 读数是______12:A A 的读数是_______2A ;那么12R :R =_______.

30.某同学连接的电路如下左图所示,他所用的电源是四节新干电池串联组成的电池组,当他将开关

闭合时,电压表的示数为2V ,则1L 两端的电压为______.当他将开关断开后电压表的示数为______.

31.在如下右甲图中,123R R =,要使1R 与2R 组成并联电路,应闭合开关______,断开开关______,

此时1R 与2R 中通过的电流比12:I I =______,在乙图中,闭合开关S ,并将滑片向右移动,电压表示数将______(选填“变大”,“变小”或“不变”),如在移动滑片时,○V 的示数突然增大到接近电源电压值,而○A 的指针几乎不偏转,出现这一现象的原因可能是______.

32.20C °时,根据某固体物质在不同质量的水中达到饱和状态时所溶解的质量,绘制成如图所示的斜线,回答下列问题:

(1)20C °时,该固体物质的溶解度为_______.

(2)C 点所对应的溶液是_____(填“饱和溶液”或“不饱和溶液”). (3)若从D 点溶液得到A 点溶液,需增加该溶质______g .

(4)图中四点所对应的溶液质量分数大小关系为_______.

33.(1)如右图,在注射器A 、B 处分别扎一个等大的小孔,插入两根相同规格的硬质塑料管(连接处密封),并在管上分别系一个未充气的同规格气球(连接处不漏气),先慢慢往外拉活塞,使注射器中充满空气,接着快速向内推动活塞,在此过程中可观察到A 、B 两孔处气球的鼓起情况是_____(填序号).

①A 孔气球大 ②B 孔处气球大 ③两个气球一样大

电流(毫安) 10

30 100

人体反应

触电感觉,人可挣脱 感到剧痛,神经麻木 短时间内使人心跳停止

皮肤干燥的人两手间的电阻约为3110′欧,当皮肤潮湿时,电阻可能降到 1.510′欧,则皮肤潮湿时,只要在两手间加______伏的电压就可能会使人有触电感觉.

34.在相距20km 的甲、乙两地之间有两条输电线.已知每1m 输电线的电阻为0.01W ,现输电线在某处

发生短路,为确定短路位置,检修员利用电压表,电流表和电源接成如图所示电路进行检测,当电压表的示数为1.5V 时,电流表示数为30A m ,则短路处距甲地一条输电线的电阻为_____W ,短路位置距甲地的距离为______km .

35.如图所示电路图,电源电压恒定.当开关1S 、2S 闭合,2S 断开时,电流表的读数为1安,电压表

的读数有4伏.当开关关1S 、2S 闭合,2S 断开时,由于电阻1R 、2R 中有一个电阻出故障,电流表的读数为1.5安,电压表的读数为6伏,则电源电压为______伏,电路中出现的故障是_______.

36.如右图甲所示电路,电源电压不变,闭合开关后,滑片P由b端滑到a端,电压表示数U与电流表示数I的变化关系如图乙所示,则可判断电源电压是______V,滑动变阻器的最大阻值为

______W.

三、实验作图题(37题4分,共余每空2分,共20分)

37.文澜中学实验室的投影仪灯光照明电路中工作时会产生大量的热,若不及时给灯光散热,灯泡就容易损坏.投影仪内有电风扇(元件符号—○M—)为其降温,灯泡和电风扇均单独工作.为了确保降温效果,电教委员在老师要上课时,先闭合POWER开关,此时灯泡并不亮,电风扇运转,再闭合ON/OFF开关灯光亮,老师下课时,则先断开ON/OFF开关,此时灯光不亮,电风扇仍继续转动,直到灯光降温后再断开POWER开关,请在右侧虚线的方框内画出电路图,并把“POWER”

和“ON/OFF”标在相应开关的位置上.

38.为研究桑叶提取液对患糖尿病小白鼠的降血糖效果,研究小组进行了如下实验:①测定各组小白鼠的起始血糖浓度;②两组小白鼠灌喂桑叶提取液2毫升/天,甲组和乙组小白鼠灌喂等量蒸馏水;

组别小白鼠状况数量/只起始血糖浓度/毫摩●升-14周后血糖浓度/毫摩●升-1

甲健康10 3.85 3.94

乙患糖尿病1019.4619.00

丙患糖尿病1018.6210.12

请回答:

(1)在实验中,每组选取10只小白鼠而不用1只,目的是_____;

(2)通过上述实验可以得出的结论是______.

39.小李用如下左图所示的电路探究“通过导体的电流与导体两端电压的关系”.电源由二节干电池组成且电压恒定,下右表是她通过实验得到的几组数据,其中第5组有明显错误,原因是______.实验中,她所选择的变阻器是_______(选填字母)

A .100.5A W

B .201A W

C .500.5A W

??序号

1 2

3 4 5 6

电压/v u 0.4 0.8 1.2 1.6 2.0 2.4

电阻I/A 0.08 0.16 0.24

0.32

? ?

40.图甲是用伏安法测未知电阻R 的实验图:

(1)请用笔画线代替导线,将图甲中实物电路连接完整.

(2)闭合开关,将测算P 向左滑动时,此时电压表示数为2.4V ,电流表示数如图乙所示,则未知

电阻R=______W . (3)若实验中只有一个电压表和一个已知电阻0R ,小明设计了如图丙所示的电路,同样可以测量

未知电阻?R ,请在空格内将实验步骤补充完整.

①闭合S 、断开2S ,用电压表测出特测电阻X R 两端的电压为1U ; ②_______,用电压表测出电源的电压U ;

③请写出用测量值U 、2U 及2R 来表示?R 的表达式:?R ___________.

四、分析计算题(6+6=12分)

41.实际的电源都有一定的电阻,如干电池,我们需要用它的电压U 和电阻两个物理量来描述它.实

际计算过程中,可以把它看成是由一个电压为U 、电阻为0的理想电源与一个电阻值为的电阻串联而成,如图甲所示:

在图乙中114R =W ,23R =W ,当只闭合1S 时,电流表读数1I =0.2A ;当只闭合1S 时,电流表读数?I =0.3A ,把电源按图甲中的等效方法处理.求电源的电压U 和电阻.

42.一艘潜水艇的艇壳体积是36000m ,其内部水箱体积是32000m .

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