1. In a day, the rule of the shadow change of objects under the sun is (a)
One west and one east; Long and short
B east and west; Low, high and low
C east and west; Long and short
2. The sundial is a tool for measuring (b).
A volume b time c length
3. The reason for the formation of day and night is (c).
A. the sun rises and sets in the west B. the cover of dark clouds C. the rotation of the earth
4. The periodic change of the moon phase is (b).
A one year, b one month and c one week.
5. The new moon refers to (C) in the sky.
A crescent moon b a full moon c no moon.
6. The shortest shadow in a day is in (b)
A in the morning, b at noon and c at night
7. The first scientist to put forward the earth's rotation was (A)
Copernicus Ptolemy Newton
8. The time for owls to sleep is (a)
A morning, afternoon, b noon, evening, c evening, morning.
9. The sundial kept in the Palace Museum in Beijing is called (C).
A vertical sundial b horizontal sundial c equatorial sundial
10. Snails usually come out for activities (c).
A in the morning, b in the afternoon and c in the evening.
1 1. Among the following objects, (BCDEF) is a light source, (c) is a natural light source, and (BDEF) is an artificial light source.
A moon b laser c firefly d candle e electric light f bonfire g glass curtain wall
The following belongs to the non-conductive object is (b).
A wet towel b plastic scissors c human body
2 1. When detecting the cassette, if the small light bulb is found to be dimmed, the cassette may be connected to (c) at this time.
Batteries, wires, light bulbs.
22. Which of the following can't touch the magnet (B)?
Transparent tape b tape c plastic patch
23. Which of the following can increase the magnetic force (AC) of electromagnet?
A increase the current b increase the nail c increase the coil.
fill (up) a vacancy
Breathing allows us to breathe in air rich in (oxygen) and exhale waste gas containing a lot of (carbon dioxide). The lung is an important organ for exchanging oxygen and carbon dioxide.
Heartbeat is the contraction and relaxation of the heart. Every time the heart contracts and relaxes, we will feel the heartbeat.
(Heart) and (blood vessels) are the blood circulation organs of human body.
Light travels in a straight line in the same substance.
The reason for pinhole imaging is that light travels in a straight line.
The smoother the surface, the better the reflection effect.
A transparent lens with a thick center and a thin edge is called a convex lens, and a transparent lens with a thin center and a thick edge is called a concave lens.
A convex lens can make light (converge) and a concave lens can make light (disperse).
Sunlight can be divided into seven colors (red, orange, yellow, green, blue, indigo and purple).
Through the red filter, the white clothes you see are (red).
Third, question and answer.
1. Is pinhole imaging upside down? Why?
Yes, the image formed by the small hole is upside down, because the light on the left side of the object will be projected to the right side of the screen after passing through the small hole, and the light on the right side will be projected to the left side of the screen after passing through the small hole.
2. How is the rainbow formed? What other ways can we make rainbows?
Small water droplets in the air scatter sunlight and form rainbows. We can make rainbows by spraying water with our backs to the sun.
3. Why are water drops a natural magnifying glass?
Because the water drop is thick in the middle and thin at the edge, just like a convex lens.
Please write down the machines or objects that use magnets in people's daily life.
Refrigerator pencil case
5. What are the ways to avoid electric shock?
Don't fish and fly kites under high-voltage lines; Don't hang clothes on the wires; Don't wipe live appliances with a wet rag; You can't connect many electrical appliances to the socket.
6. What are the common conductors?
Water, metal, human body
7. What are the common insulators?
Wood, paper, glass, plastic
8. Why does the heart keep the blood flowing in the blood vessels?
In the process of blood flow, oxygen absorbed by respiratory organs and nutrients absorbed by digestive organs are transported to all parts of the body, and carbon dioxide and other wastes produced by the whole body are eliminated from the body through the lungs and excretory organs. Only when the heart keeps beating can blood keep circulating in the blood vessels.
Fourth, the experimental operation questions
1. Collect two bags of exhaled gas, pour clear limewater into one bag and shake well. We can see (the clear lime water becomes turbid). This experiment shows that exhaled gas contains a lot of carbon dioxide.
I. Fill in the blanks (50 points)
1, () and () are two main rivers in China, and they are also world-famous rivers. People like to praise them, such as poetry (leaves fall like the waves of a waterfall, and I watch the long river always roll forward).
Life has existed on the earth for a long time. Scientists know from the fossils excavated underground that the earliest ancestors of human beings evolved from (). Our great motherland has a long history. From the evolution process of (Yuanmou Man), (Beijinger) and (Man), we can see the track of early human evolution in China.
3. The four great inventions in ancient China were (), (), () and (). The four classical novels in ancient China are (), (), () and ().
4. The ancient famous doctors I know are () and ().
5. (Zu Chongzhi) was a great scientist in the Southern and Northern Dynasties. He calculated pi to the seventh decimal place. The seismograph was invented by a great scientist in the Eastern Han Dynasty in China, and its function is (1 earthquake 2 reflects the wisdom of our working people, and our ancient science and technology is at the leading level in the world).
6. () is the earliest Chinese character found in China. I also know the font types of Chinese characters, such as (), () and (). There were () and () calligraphers in ancient China.
7. Confucius' name () and word () were China's ancient thinkers and (), and later generations edited his remarks as (). Sima Qian of the Western Han Dynasty wrote a masterpiece (Historical Records).
8. () and () are the ancestors of the Chinese nation, so we all call ourselves ().
9. Our motherland has beautiful mountains and rivers and a long history. The places of interest I know are () (), (), (), (), (), () and so on. I have been to (), and I want to go to () again, because there is something I yearn for ().
Second, I know (30 points)
1, the main achievements of our class this semester are:
In order to make the class better, my suggestion is
2. My "post" in the class is: My contribution to the class this semester is
In the eyes of my parents, I am a child of ().
In the eyes of my classmates, I am a child of ().