问题 实验题

小红同学在做“探究平面镜成像”的实验时,将一块玻璃板竖直架在水平台上,再取两段完全相同的蜡烛A和B,点燃玻璃板前的蜡烛A,进行观察,在此实验中:

(1)小红选择玻璃板代替镜子进行实验的目的是__________.

(2)所用刻度尺的作用是便于比较像与物________关系.

(3)选取两段完全相同的蜡烛是为了比较像与物的__________关系.

(4)移去后面的蜡烛B,并在其所在位置上放一光屏,则光屏上__________接收到蜡烛烛焰的像(填“能”或“不能”).所以平面镜所成的像是__________像(填“虚”或“实”).

(5)小红将蜡烛逐渐远离玻璃板时,它的像__________ (填“变大”、“变小”或“不变”).

⑹小红得到结论:平面镜成像特点:                          像。

答案

(1)便于确定像的位置    (2)到玻璃板距离    (3)大小   (4)不能 虚  (5)不变 (6)正立  等大 虚

题目分析:探究平面镜成像实验中,使用玻璃板是因为玻璃板透光,便于找到像的位置。平面镜所成的像和物体大小相等,所以应选用两段完全相同的蜡烛,来比较像和物体的大小关系。平面镜所成的像是虚像,不能成在光屏上,像和物体始终是等大的,与物体到平面镜的距离无关。

阅读理解

The NBA playoffs(季后赛) began on April 28, and the next two months will be filled with games decided in the final minutes. The playoffs are also a way to show off the world’s best basketball players.
There’s a saying from Spiderman: “With great power comes great responsibility(责任).” This is true no matter whether you are a class monitor or a president. A recent survey in the USA asked kids what they would do to make life better for other kids if they were president. “Providing shelter” topped the list.
May 19, 1613: Xu Xiake, a famous traveler during the Ming Dynasty, started his trip around China, which lasted for more than 30 years. In 2011, China announced its first National Tourism Day, held on May 19 every year in memory of this ancient explorer.
Do you have female friends that refer to as “guimi”? If you are a girl and the answer is yes, you are a lucky dog. “Guimi” is only used among girls. It refers to your most honest friends. In English, the word to use is “BFF”- which stands for best friend forever. But if you want to say a guy is your close friend or “nanguimi”, you should use “bromeo”, which is made up of “bro” and “Romeo”.
CHINA is planning to build a national earthquake monitoring and warning system in five years. While the system would never be able to forecast an earthquake, it could detect(探测) quakes and notify people within seconds before seismic(地震引起的) waves actually hit them, and a trial program including nearly 100 monitoring stations is currently being carried out in southeast China’s Fujian Province and has proven successful.
小题1:The above five passages may be         .
A.from posters B.from newspapers C.from adsD.from novels
小题2:From the passage we know May 19 is           in China.
A.the beginning of the NBA playoffs B.in memory of Spiderman
C.Earthquake DayD.National Tourism Day
小题3:“Guimi” refers to           .
A.any female friendsB.bromeoC.your most honest friendsD.those friends who can only share happiness
小题4:China’s earthquake monitoring and warning system could           .
A.forecast an earthquake B.be used in Zhejiang Province
C.not detect quakesD.notify people within seconds
小题5:Which of the following is wrong according to the passage?
A.China will build earthquake warning system in five years.
B.In English, the word “BFF” stands for best friend forever.
C.The playoffs can show off the world’s best football players.
D.“Providing shelter” topped the list in American kids’ survey.
判断题