问题 填空题

本题为选做题,考生只选择一题作答,若两题都作答,则按(1)题计分.

(1)(本题供使用选修1一1教材的考生作答.)

如图所示,电流表与螺线管组成闭合电路,将磁铁插入螺线管的过程中,电流表指针______(选填“偏转”或“不偏转”),磁铁放在螺线管中不动时,电流表指针______(选填“偏转”或“不偏转”)

(2)(本题供使用选修3一1教材的考生作答.)

一个电荷只在电场力作用下从电场中的A点移到B点过程中,电场力做了2×10-6 J的正功,那么______

A.电荷的电势能减少了2×10-6 J

B.电荷的动能增加了2×10-6 J

C.电荷在B处时具有2×10-6J的电势能

D.电荷在B处时具有2×10-6 J的动能.

答案

(1)当将磁铁插入螺线管的过程中,线圈磁通量变化,有感应电流产生,若磁铁放在螺线管中不动时,磁通量不变,无感应电流产生,指针不偏转.

故答案为:偏转,不偏转.

(2)电场力做正功,电势能减小,动能增加,故AB正确;

电场力做功对应着电势能和动能的变化,不能说明具有多少电势能或者动能,故CD错误.

故选AB.

判断题
单项选择题

Part 4


Questions 26-45


·Read the following article and choose the best word for each space.
·For questions 26-45, mark one letter A, B, C or D on the Answer Sheet.

iPhone Left in Hot Car for Three Hours


The normally peaceful suburban town of Winnetka is still reeling following the news Monday (26) a local resident, whose name is being (27) by police pending a full investigation, left an iPhone unattended for more than three hours in a car (28) in the hot sun.
"Responding to calls from (29) . passersby, who observed the iPhone sitting in a vehicle in the parking (30) of the Westfield Shopping Center, police arrived on the (31) at approximately 4 p.m. and immediately intervened to save the device," said Winnetka police chief Douglas Blaine. "Security cameras have shown that the iPhone had been in the car— with the doors (32) and the windows rolled (33) —since 1 p.m. Due to the tragic and highly emotional (34) of this case, we cannot say any (35) at this time."

A. warmth B. coldness C. gratitude D. concern

According to official police records, two officers forcibly (36) into the car at 4:07 p.m. and found the iPhone (37) face down on the dashboard. The iPhone at first showed no (38) of life, but after a tense few seconds, officers were able to wake it and get it to (39) to a series of simple touch commands. Police said that if the iPhone were left in the extreme (40) for any longer, it could have died.
The iPhone was rushed by ambulance to a nearby Apple facility for careful (41) .Miraculously, no damage to its memory, screen, or wireless capabilities was reported.
Upper-middle-class suburbanites from all over the North Shore area have reacted to the near-tragedy with an unprecedented outpouring of (42) . Hundreds of cards and letters have come streaming in, and local talk radio shows have been flooded (43) calls demanding that the iPhone’s (44) be prosecuted. Many have come forward offering to take the iPhone into their custody, and still (45) have donated free downloads, ringtones, and MP3s to the victimized object.