Note: The examination time of this volume is 90 minutes, with a full score of 100.

A, multiple-choice questions (this question has 20 small questions, each with 2 points and ***40 points. There is only one answer to every question.

1. The gravity of the following objects is about 10 N ().

A. A science textbook B. An egg C. A chicken D. A middle school student

2. Among the following sports, the fastest is ()

A. The tractor traveled 2.4 kilometers in 10 minutes. B. A classmate 1 finished running in 45 seconds1000m.

C.the record of the 100-meter race is 9.85 seconds. The speed of the truck is 30 kilometers per hour.

3. The best season for Antarctic exploration is () in the northern hemisphere.

A. spring, summer, autumn and winter

4. Below 200 meters above sea level, the terrain with wide ground and small surface fluctuation is ()

A. Plain B. Hilly C. Plateau D. Mountain

Cut off the budding branches of Chinese rose and insert them in the soil, and new plants will soon grow. This propagation mode of Chinese rose belongs to ()

A. fission propagation B. vegetative propagation C. budding propagation D. spore propagation

6. The place where human fertilized eggs form and start to divide is () respectively.

A. ovary, uterine fallopian tube, uterine fallopian tube, ovarian fallopian tube, fallopian tube

7. When the seeds germinate, the nutrients needed for embryo development come from ().

A. cotyledons B. endosperm C. cotyledons or endosperm D. cotyledons and endosperm

8. The following year is a leap year ()

a 1900 b 1992 c 1994d 1998

9. In the four scenes shown in the figure, the phenomenon mainly caused by light propagating in a straight line is ().

10. The geographical phenomenon caused by the earth's rotation is ()

A. Variation of the length of day and night B. Variation of day and night C. Seasonal variation of solar height D. Variation of four seasons

1 1. The places where angiosperms are formed and fertilized are () respectively.

A. ovule and stigma B. pollen tube and ovule C. filament and ovule D. ovary and pollen tube

12. You should pedal your bike several times before going uphill by bike. The purpose of this is ().

A. increase the inertia of the bicycle B. increase the kinetic energy of the bicycle

C. increase the friction when the bicycle goes uphill D. all the above statements are reasonable

13. In the phenomenon shown below, the motion state of the object has not changed ().

14. A telephone pole with a length of 1 meter was erected in the city square of Shaoxing city. The day with the longest shadow at noon is ().

A. winter solstice B. summer solstice C. vernal equinox D. autumn equinox

15. The main difference between monocotyledons and dicotyledons is ()

A. the number of cotyledons in seeds is different. Whether the seed has endosperm. C whether the cotyledons are unearthed when the seeds germinate. D. whether the seeds are naked.

16. When listening to a large symphony, we can distinguish the sounds made by various musical instruments with our eyes closed. This is because ()

A. different tones B. different loudness C. different timbre D. different distances

17. In the method shown in the figure below, it is () that increases the friction.

18. The following stress analysis about TV set placed on the desktop is correct ().

A. Gravity on TV and pressure on the desktop are a pair of balancing forces.

B The supporting force of the desktop to the TV set and the gravity on the TV set are a pair of balancing forces.

C The pressure of the TV set on the desktop and the support of the desktop on the TV set are a pair of balancing forces.

D The gravity on the desktop and the supporting force on the TV are a pair of balancing forces.

19. When riding a roller coaster, Zhang was afraid that he would close his eyes, but he could still feel the roller coaster roll, turn left and right, and accelerate and decelerate. The related structure is ().

A. Middle ear B. Tympanic membrane C. External ear D. Inner ear

20. The hydrogen balloon hanging objects at the speed of 1 m/s rises vertically at a constant speed. In the process of rising, the rope that hangs the object suddenly breaks, and then the object will () after the rope breaks.

A. fall down immediately. B. rising at a constant speed. C. first go up for a distance, then go down. Do Nothing Bitches

Fill in the blanks (9 small questions in this question, including 2 points for 27 ~ 29 small questions, and 1 point for the rest, ***30 points)

Methyl ethylene propylene

Time14.714.214.3

2 1. Three students, A, B and C, took part in the 100 meter race. If the recorded time is as shown in the table on the right, the fastest among the three students is _ _ _ _ _. The reason for the judgment is _ _ _ _ _ _ _ _ _ _ _.

22. The peaches we usually eat are developed from _ _ _ _ _ _ _, and the peanuts we eat are developed from _ _ _ _ _ _ _.

23. According to the scale of latitude and longitude on the right, answer the following questions:

(1) If point B (East Eighth District) is 6 o'clock, then point A is _ _ _ _ _ _ _ _;

(2) If B happens to be vernal equinox at this time, the noon sun altitude angle on the equator is _ _ _ _ _ _ _ _.

24. According to China News Service Jiuquan Morning News 65438+1October 65438+In June 2003, at 6: 23 Beijing time, the "Shenzhou 5" manned spacecraft landed successfully at the landing site in Inner Mongolia, and the space hero Yang Liwei left the cabin independently. ...

① Kinetic energy and potential energy of spacecraft: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

(2) When the spaceship landed, many Chinese in London (Central Time Zone) held celebrations, and the local time was _ _ _ _ _ _ _ _.

(3) Jiuquan City, where the spacecraft was launched, is an oasis on the ancient Silk Road, surrounded by a vast desert. Dunhuang and Mingsha Mountain are famous all over the world. The main external force affecting the topography of this area is _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

25. Please answer the questions according to the eye contour map on the left:

(1) The structural name of A in the diagram is _ _ _ _ _ _ _ _. It has a protective effect on the eyeball.

(2) The name of B in the picture is _ _ _ _ _ _ _ _. When we walk out of the cinema in the morning, its diameter will become _ _ _ _ _ _ _, and this process is adjusted by C in the picture. The structural name of C is _ _ _ _ _ _ _ _ _.

26. The picture on the right shows the development of the main sex organs of men and women. Please answer the following questions according to the pictures:

(1) In the figure, the organ represented by A is _ _ _ _ _ _ _ _ _, and the organ represented by B is _ _ _ _ _ _ _ _ _. According to the chart analysis, we can find that the development of A is _ _ _ _ _ _ _ _ to _ _ _ _ _ _.

(2) Due to the development of organs A and B, there will be _ _ _ _ _ _ _ _ _ _ _ for boys and _ _ _ _ _ _ _ _ _ _ for girls.

27. Make a gravity diagram when the shot with a mass of 3 kg rolls down the inclined plane.

28. Complete the light path diagram.

29. During the summer vacation, several students went out to play in the wild. When they reached a hole, their flashlight was broken. It was dark inside, and there was a voice of "whoops ...". Curious Xiao Yong wanted to go in and have a look, but he was a little scared. Clever Xiaohui took the small mirror in her bag and said, "I can light the hole!" "

(1) Please draw how Xiaohui brightens the inside of the cave.

(2) How did the "whoop" sound come from ... whoop ... "Was it formed in the cave? ___________________。

(3) Xiao Sheng is repairing the flashlight and removing the lamp holder. Just tighten the light bulb a little and the flashlight will come on. Please judge what's wrong with the flashlight.

Third, ask questions (there are 4 small questions in this question, 1 point per grid, ***22 points)

30. In modern society, an important cause of traffic accidents is that cars can't stop immediately when an accident happens. It takes a while for the driver to see the situation clearly and operate the brakes. This period of time is called reaction time. During this period, the car should keep the original speed for a certain distance, which is called the reaction distance. From operating the brakes to stopping, the car has to travel forward for a certain distance, which is called the braking distance. As shown in the figure.

The following is the reaction distance and braking distance measured by an alert driver when driving a well-maintained car at different speeds on a dry horizontal highway.

Speed (km/h) 40 50 60 80 100

Reaction distance (m) 7 9111519

Braking distance (m) 8 13 20 34 54

Try to answer the following questions:

(1) When the car runs normally, the friction between the wheel and the ground is _ _ _ _ _. After braking, due to _ _ _ _ _ _ _ _, the car will continue to slide forward for a certain distance.

(2) Using the data in the above table, the response time of the driver is calculated to be about _ _ _ _ _ _ _ _ _.

(3) By analyzing the data in the above table, we can know that the relationship between braking distance and driving speed is _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

(4) In order to remind drivers and friends to pay attention to driving safety in rainy and snowy weather, warning signs of "Rain and snow are slippery, slow down" are often set up beside the expressway. Please briefly explain the scientific truth of this sentence:

____________________________________________________________________________。

3 1. Li Ming bought a bag of bean sprouts and put it in the sun. In the afternoon, he opened it and found that many bean sprouts had become "green bean sprouts". He felt very strange. Please discuss the reasons with him:

(1) Your question is: Can _ _ _ _ _ _ affect the production of chlorophyll (green)?

(2) In response to your question, please assume that _ _ _ _ _ _ _ has an effect on the production of chlorophyll.

(3) Design the experimental scheme:

A. Divide a certain amount of fresh soybean sprouts into equal parts and put them into container A and container B respectively.

B. A is cultured in _ _ _ _ _ _ _ _ _, and B is cultured in _ _ _ _ _ _ _ _.

(4) The expected result of this experiment is: a bean sprout _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

(5) Experiments prove that _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ refers to

32. Please choose the common equipment in life, design an optical experiment and fill in the following table.

Simply explain the observable phenomena by manipulating materials.

For example: cup, water, vibration

Flashlight, milk powder 1. Fill the cup with water.

2. Pour a spoonful of milk powder into the water.

Medium, stir well.

3. The optical path of the laser obliquely incident on the water surface is bent due to the refraction of light.

33. Look at the picture and answer the following questions (each space 1, * * * 6).

(1) This picture is seen from the top of the earth _ _ _ _ _ _.

(2) Of the four places A, B, C and D, _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

(3) at noon in D 12, in C _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

Fourth, the calculation problem (2 small questions in this question, 4 points for each small question, 8 points for * * *)

34. Shanghai Maglev Demonstration Line is a major project of Shanghai's traffic development during the Tenth Five-Year Plan period, and it is also the first maglev demonstration line put into commercial operation in the world. The operation line starts from Longyang Road Station of Shanghai Metro Line 2 in the west and ends at Pudong International Airport in the east, which mainly meets the demand of high-capacity and high-speed traffic connecting Pudong Airport with the urban area. The main line of the line is about 30 kilometers long, and the double lines run through from top to bottom. The running time of single line is about 8 minutes, and its average running speed is required.

35. The object has a mass of 20kg and is placed on a level ground. Now push it to the left with a horizontal thrust of 40N, and it won't move. Find: ① the gravity of the object, ② the friction of the object.

See if it's right? That's all I did.