1.选择题- (共8题)
8.阅读短文，从每小题所给的四个选项中，选出正确的选项。D
Few others know more personal information about people than the smart phones in their pockets: phone numbers, location(位置), even the owner's real name and a unique(唯一的) ID number that can never be changed or turned off.
These phones don't keep secrets. They are sharing this personal information widely and secretly, a Wall Street Journal survey has found. An examination of 101 popular smart phones "apps" games and other software(软件) showed that 56 sent the phone's unique ID to other companies without users' awareness or agreement. Five sent age, nationalities and other personal information to outsiders.
The findings discover the effort by those app companies to collect personal information in order to get sponsorship (赞助) for which are largely traded. The Pandora, a music app, sends age, location and other information to different ad companies. A game called Paper Toss, in which players try to throw paper into a trash can, also sends the phone's ID number to at least five ad companies. Omegle, an iphone app for meeting strangers around for the purpose to make friends, does the same thing. For these companies, personal information weighs much more than apps themselves.
"In the world of mobile, there is no secret" says Michael Becker of the Mobile Marketing Association. A mobile phone is "always with us. It's always on". Mobile phone company says it reviews each app before offering it to users. Both Apple and Google say they protect users by requiring apps to ask users for agreement before providing kinds of information, such as location. "We have created strong protections for our customers, especially location-based information." says one mobile phone company. "Trust is badly important."
Few others know more personal information about people than the smart phones in their pockets: phone numbers, location(位置), even the owner's real name and a unique(唯一的) ID number that can never be changed or turned off.
These phones don't keep secrets. They are sharing this personal information widely and secretly, a Wall Street Journal survey has found. An examination of 101 popular smart phones "apps" games and other software(软件) showed that 56 sent the phone's unique ID to other companies without users' awareness or agreement. Five sent age, nationalities and other personal information to outsiders.
The findings discover the effort by those app companies to collect personal information in order to get sponsorship (赞助) for which are largely traded. The Pandora, a music app, sends age, location and other information to different ad companies. A game called Paper Toss, in which players try to throw paper into a trash can, also sends the phone's ID number to at least five ad companies. Omegle, an iphone app for meeting strangers around for the purpose to make friends, does the same thing. For these companies, personal information weighs much more than apps themselves.
"In the world of mobile, there is no secret" says Michael Becker of the Mobile Marketing Association. A mobile phone is "always with us. It's always on". Mobile phone company says it reviews each app before offering it to users. Both Apple and Google say they protect users by requiring apps to ask users for agreement before providing kinds of information, such as location. "We have created strong protections for our customers, especially location-based information." says one mobile phone company. "Trust is badly important."
2.单选题- (共3题)
9.
如图所示，a和b是两条靠得很近的平行通电直导线，电流方向如图所示，且
，当垂直于a、b所在平面向里加一匀强磁场B时，导线a恰好不再受安培力，跟加磁场B以前相比较，则导线b（ ）
，当垂直于a、b所在平面向里加一匀强磁场B时，导线a恰好不再受安培力，跟加磁场B以前相比较，则导线b（ ）| A．不再受安培力 |
| B．受到的安培力为原来的两倍 |
| C．受到的安培力小于原来的两倍 |
| D．受到的安培力大于原来的两倍 |
10.
如图所示在绝缘的水平面上等间距固定着三根相互平行的通电直导线a、b和c ，各导线中的电流大小相同。其中a、c导线中的电流方向垂直纸面向外，b导线电流方向垂直纸面向内。每根导线受到另外两根导线对它的安培力作用，则关于每根导线所受安培力的合力，以下说法中正确的是（）
| A．导线a所受合力方向水平向右 |
| B．导线c所受合力方向水平向右 |
| C．导线c所受合力方向水平向左 |
| D．导线b所受合力方向水平向左 |
11.
如图所示，通电直导线垂直穿过闭合线圈的中心，那么
| A．当导线中电流增大时，线圈中有感应电流； |
| B．当线圈左右平动时，线圈中有感应电流； |
| C．当线圈上下平动时，线圈中有感应电流； |
| D．以上各种情况都不会产生感应电流。 |
3.多选题- (共2题)
12.
关于圆周运动的向心力、向心加速度、角速度、线速度的理解，下列说法正确的是
| A．做圆周运动的物体所受的合外力就是向心力，其方向一定指向圆心； |
| B．做匀速圆周运动的物体向心加速度越大，物体速度方向改变越快； |
| C．做匀速圆周运动的物体角速度越大，物体运动的速率越大； |
| D．做匀速圆周运动的物体角速度越大，连接物体与圆心的轨道半径转动越快。 |
13.
如图所示，一内壁粗糙的环形细圆管，位于竖直平面内，环形的半径为R（比细管的直径大得多），在圆管中有一直径比细管内径略小些的小球（可视为质点），小球的质量为m，设某一时刻小球通过轨道的最低点时对管壁的压力为7mg。此后小球便作圆周运动，经过半个圆周恰能通过最高点，则此过程中小球克服摩擦力所做的功是
| A．0.5mgR | B．mgR | C．2mgR | D．3mgR |
4.填空题- (共1题)
14.
如图所示，A、B、C为匀强电场中的三点，构成边长为a的等边三角形，场强为E，方向平行于ABC平面，已知电子从A运动到B时，动能增加
Ek；质子从A运动到C时动能减少2Ek，已知电子与质子的电量的大小都为e，则该匀强电场的场强E为_____，方向____。
Ek；质子从A运动到C时动能减少2Ek，已知电子与质子的电量的大小都为e，则该匀强电场的场强E为_____，方向____。5.解答题- (共1题)
）。试卷分析
-
【1】题量占比
选择题:(8道)
单选题:(3道)
多选题:(2道)
填空题:(1道)
解答题:(1道)
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【2】：难度分析
1星难题：0
2星难题：0
3星难题：0
4星难题：0
5星难题：0
6星难题：3
7星难题：0
8星难题：4
9星难题：0