问题 实验题

某同学在做测电池电动势和内阻的实验中,采用了如图甲所示的电路图,保护电阻的阻值为2Ω,请回答下列问题:

小题1:请按照电路图,在图乙中连接实物图。

小题2:该同学正确地连接了电路后,发现闭合电键后,电流表的示数为零,电压表的示数不为零;接下来,该同学用多用电表的电压档检查电路,把两个表笔分别接在时,示数均为零;接在时,示数与电压表示数相同,各个接线柱均未接错,且接触良好,各接线柱之间也并未发生短路,由此可推断故障原因应是       

小题3:排除故障后,该同学顺利完成实验,测得六组实验数据,如下表所示,

1.201.101.000.800.700.60
0.100.140.170.230.270.30
根据数据在坐标图丙上画出图线,并回答该电池的电动势         V,内阻          Ω(均保留两位有效数字)。

答案

小题1:

小题2:de之间断路或滑动变阻器断路

小题3: 1.4~1.6 V,  0.9~1.1 Ω

小题1:实物图如下

小题2:电流表的示数为零,电压表的示数不为零,说明有断路位置,且断路位置在adec之间,该同学用多用电表的电压档检查电路,把两个表笔分别接在时,示数均为零;接在时,示数与电压表示数相同,说明de之间断路

小题3:图略,

图线纵截距表示电动势,斜率的绝对值表示内阻,可知 1.4~1.6 V,  0.9~1.1 Ω

辨析题
阅读理解

第三部分:阅读理解(共20小题;每小题2分, 满分40分)

阅读下列短文,从每篇短文后所给各题的四个选项(A、B、C和D)中,选出最佳选项,并在答题卡上将该项涂黑。

Catherine Destivelle is a rock star. She loves rock, but she can’t sing or play the guitar! She is a rock climber and a big star in France and Italy. She is the most famous woman climber in the world because she often climbs without ropes. She climbs in many countries but most often in the French Alps near Chamonix, where she lives. She started climbing near her home in Paris when she was five. he French Alpine Club to learn more, but immediately she climbed better and more quickly than the older members of the club. She won her first competition in Italy in 1995.

Three years ago she found a new route up the Dru Mountain near Chamonix. The climb took eleven days and for four days the snow was so heavy that she could not move. Last year other climbers tried to follow the new Destivelle Route, but they failed. They are going to try again this  year.

People always ask her about her climbing. She says, “I climb because I’m in love with mountains. I like touching the rock and reading the face of the rock. I like it a lot. I felt at home on the side of a mountain. I prepare well before I go, so I’m never worried.”

Catherine chooses new mountains from books—like buying from a shopping catalogue (目录)! “I see a nice mountain and I go to climb it!” Her next mountain is in Pakistan. She is going there next month. “It’s much bigger than the Dru, so it’s going to take longer to climb. An American climber, Jeff Lowe, is coming with me to help.”

51.Catherine Destivetle is called “a star” because ________.

A. she won a competition in 1995                      B. she loves rocks

C. she’s a famous woman climber                     D. she found a new route up to the Dru Mountain

52.She had great trouble finding a new route up the Dru Mountain because ________.

A. she lost her way                                                          B. the climb took 11 days

C. she needed help from an American climber        D. there was heavy snow

53.On the side of a mountain she feels ________.

A. worried                                                                          B. easy and happy

C. like staying at home                                                   D. well

54.We can infer from the passage people often ask her “________”.

A. Why do you like climbing?                              

B. Are you in love with an American climber?

C. Do you enjoy reading books on mountains?

D. What do you do before you go climbing?