The final physics test paper for eighth graders in the first semester of the 2008-2009 school year in Huadu District, Guangzhou City, Guangdong Province. This test paper is divided into two parts: Paper I (multiple choice questions) and Paper II (non-choice questions), with a maximum score of 100 points.
The exam time is 80 minutes.
Things to note: 1.
Before taking the answer sheet, candidates must use a black pen or signature pen to fill in their name and candidate number on the answer sheet, and then use a 2B pencil to blacken the corresponding number.
2.
After selecting the answer to each multiple-choice question, use a 2B pencil to blacken the answer number of the corresponding question on the answer sheet.
If you need to make changes, erase them with an eraser and then select other answers.
Cannot answer on the test paper.
3.
Non-choice questions must be answered with a black pen or rollerball pen, and the answers must be written in the corresponding positions in the designated areas of each question on the answer sheet; if changes are needed, cross out the original answer first, and then write the new answer; not allowed
Use pencil and correction fluid.
Answers that do not meet the above requirements will be invalid.
4．
Candidates must keep their answer sheets clean and tidy. After the exam, they must return this test paper and answer sheets together. Paper I (Multiple Choice Questions ***36 points) 1.
Multiple choice questions (only one of the four options given in each question is correct, 3 points for each question, maximum 36 points) 1.
Which of the following objects is not a light source ( )A.
sun b.
candle c.
moon d.
Incandescent lamp 2. Among the following statements about sound phenomena, which one is correct ( ) A.
Sound propagates at the same speed in different media B.
If the pitch and loudness are the same, we cannot distinguish the sound C.
As long as an object is vibrating, we can hear sound D.
All objects that make sound vibrate 3.
Among the following school supplies, those that are usually conductors are ( ) A.
Plastic scale B.
Painting eraser c.
Small metal blade D.
Physics Textbook 4. Which of the following statements about light phenomena is correct ( ) A.
When light is diffusely reflected, it still obeys the law of reflection of light B.
When light is ejected from air into water, its propagation speed remains unchanged C.
A lunar eclipse is caused by the reflection of light D.
Plane mirrors can form real images 5.
In the experiment to explore the imaging rules of convex lenses, when the candle flame, convex lens, and light screen are in the positions shown in Figure 1, a clear and reduced image can be obtained on the light screen.
This imaging rule can be used to make ( )A.
Plane mirror b.
CameraC.
Slide projector D.
Magnifying glass 6. The series circuit shown in Figure 2, when the switch is closed ( ) A.
The current through point A is greater than the current through point B B.
The current through point B is greater than the current at point C C.
The current through point A is greater than the current through point C D.
The currents passing through three points A, B, and C are equal 7. After a heavy snowfall, the earth is covered with silver. At this time, you will find that the surroundings are particularly quiet. This is because the micropores in the snow can absorb sound.