Four test papers, please.

Final examination paper (questionnaire)

I. Multiple-choice questions: (3 points for each question, 75 points for * * *)

1. As the picture shows, what kind of feeling does the blind use when reading Braille? - .

I. Vision

B, touch

C, listening

D, sense of smell

Xiao Ming went to Jinhua by car. In order to prevent sunlight from entering, curtains were drawn in the car. At this time, he found an empty jar that had been motionless on the ground rolling forward. At this moment, the bus came.

A, accelerate progress; B, uniform motion; C, move slowly; D, stand still.

3. pry the stone with a crowbar, as shown in the figure, the end of the crowbar is easier to hold than the middle of the crowbar; This process shows that the role of force is related to which of the following factors:-.

A, the size of the force b, the direction of the force c, the point of force d, the object of force application.

Question 3, question 4

Xiaoming and Jason Chung catch fish with harpoons together. By the river, they saw a small fish (pictured). In which direction do you think they should put the harpoon? - ( )

A, AB B, AC C and AD D are all wrong.

5. Assuming that the friction between all objects disappears, which of the following phenomena will not happen? - ().

A, the car parked on a level road can't start.

B, we can't write with pens.

C, people standing on the ground have no pressure on the ground

D, one finger can push the train.

6. Having just finished the lesson of "Balance of Two Forces", the students are interested in whether the natural science textbooks on the table are balanced.

Strong interest. For this reason, four students in this class also had an argument. Which of their views do you think are correct? -()

A, A: The gravity of the book and the support of the desktop for the book are a pair of balancing forces.

B, B: The support of the desktop to the book and the pressure of the book to the desktop are a pair of balancing forces.

C, C: The gravity of the book and the pressure of the book on the desktop are a pair of balance forces D, D: The book is unbalanced.

7. The right picture shows the contour topographic map of a certain place, and the overlapping position of contour lines in Figure A indicates-().

A, peak b, cliff c, ridge d, valley

8. When the number of a sign observed from a flat mirror is "0 1 1-0 18", the actual number of the sign is-().

a、 1 10-0 18 B、8 10- 10 C、0 18- 1 10 D、0 1 1 10

9. In the production of bonsai, in order to make the plants flourish, the top of the plants in the pot is often cut off, in order to make which part develop better.

A, terminal bud b, lateral bud c, root d, flower

10. In a field activity, if an old man around you suddenly fainted and his breathing and pulse stopped, what measures should you take and the reasons are-.

A, the old man's heart stopped beating and died without treatment.

B, the old man stopped breathing, has died, and does not need treatment.

C, the old man has no pulse to stop breathing, has died, and does not need help.

D, although the pulse, breathing has stopped, but can't judge is dead, should immediately call for help.

1 1. The first cell of the next generation of plants is.

A, fertilized egg b, sperm c, ovule d and egg

12. As shown on the right, it shows the relationship between distance and time in the process of linear motion of an object, where A, B, C and D are four equal time intervals. In which time interval is the average speed of the object the largest? - ( )

Alcoholics Association

B.b

C.c

Secretary of defense.

13. It's spring, and bees are flying around among the flowers, with thick pollen on their feet. The behavior of bees contributes to the reproduction of plants.

A, fertilization B, seed germination C, pollination D and flowering

14. The following do not belong to the characteristics of adolescent development:-.

A, the first feature appears; B, the brain structure and function develop rapidly.

C, men began to have nocturnal emission D, and women began to have menstruation.

15. There are more seeds in the apple. Which of the following structures is related to this? - .

A, receptacle b, style c, ovule d, ovary

16. In order to study the effect of water on soybean germination, Xiao Li planted soybean seeds in two identical flowerpots and designed the following experiments. The mistakes that should be corrected in this experimental design are two flowerpots-().

Flower pot lighting conditions temperature water

20℃ is enough for nails facing the sun.

20℃ in the shade is not enough.

A, should be placed in a sunny place b, should be watered enough.

C, the temperature should be 0℃ D, should not be watered.

17. Draw a convex lens in the box below:-.

18. It is impossible to do the imaging experiment with reading glasses.

A, enlarge the real image B, enlarge the virtual image

C, inverted real image D, inverted virtual image

19. The structure of pea seeds can develop into pea seedlings:-.

A, endosperm b, embryo c, embryo d, cotyledons

20. When an object is placed on an inclined plane, the diagram of gravity on the object is correct:-().

2 1. If Xiao Li is in Tiananmen Square in Beijing and Xiao Xin is in Jinhua People's Square at noon on the summer solstice 12: 00, the most likely result is-.

A, the shadows of the two places are as long as B, Jinhua is long and Beijing is short.

C, Beijing's long, Jinhua's short D, not necessarily.

22. Xiaoming's hometown is just on the Tropic of Cancer, and his hometown can be observed for one year.

A, one direct sunlight phenomenon B, two direct sunlight phenomena

C, there is direct sunlight every day. D, there is no direct sunlight.

23. The phenomenon caused by the earth's rotation is-.

1. The earth has a hemisphere of day and night. B, there is a phenomenon of alternation of day and night on the earth.

C the terminator line moves from west to east on the earth's surface. D. extreme days and nights appear on the earth.

24. We usually call the area with high altitude but relatively low altitude—().

A, mountain B, plateau C, plain D, hills

25. Xiaoming's birthday is September 9th. He wants to have his birthday twice a year. Which of the following can be achieved? -()

A, after September 9th, in the east 12, cross international date line to the west 12.

B, after September 9th, in the west 12 area, cross the date line to the east 12 area.

C, after September 8th, in the west 12 area, cross the date line to the east 12 area.

D, after September 8th, in the east 12, cross international date line to the west 12.

Fill in the blanks: (2 points for each question, ***30 points)

During the celebration, a helium balloon stood upright in the air with a slogan written on it. If the slogan quality is 3kg, the slogan will be pulled by n .. (g= 10N/kg).

27. During a field trip, a classmate found that the rocks on a cliff were layered in front of it.

Obviously (as shown on the right), this is because the rocks in this place are deformed under the action of internal forces.

It's over. (Fill in "Bending" or "Breaking")

28. Now you can buy an ornamental plant in the market: cut it and insert it into the water. After a few days, it will grow roots and then move into the soil to become a new plant. This way of reproduction is called reproduction.

29. When a beam of light obliquely shoots from the air to the water surface, the beam may reflect and phenomenon, and after entering the water, the propagation speed of light will (fill in "unchanged", "smaller" or "larger").

30. As shown on the right, do an experiment in a vacuum. A beam of light is emitted from point S to a mirror, and then passes through a after reflection.

Point, when reflected by point A, its speed is 3× 108m/s (fill in "greater than",

"equal to" or "less than").

3 1. A small piece of wood is still floating on the water. The gravity of the small piece of wood is 3 Newton, so the buoyancy of water on it.

Size (fill in "greater than", "less than" or "equal to") 3 cows.

32. When a wooden box with a weight of 5000N is placed on the horizontal ground and pushed horizontally to the right 100N, it just moves in a straight line at a uniform speed. The friction force on the wooden box is n, and after several logs are placed under the wooden box, they are still pushed horizontally to the right at a uniform speed. At this time, the friction force on the wooden box (fill in "increase", "decrease" or "unchanged") is n.

33. What will happen to the appearance of adolescent boys and girls compared with childhood? (Please give two examples each)

Boys:

Girl:

34. If a feather falls straight from the air at a uniform speed, the resistance is 0.0098 Newton, and the mass of this feather is grams.

35. In front of a high wall, Xiao Zhao clapped his hands, and he immediately heard the echo. If he is 0/70m away from the high wall/kloc-and the speed of sound is 340m/s, he will clap his hands for two seconds and then hear the echo.

Three, analysis questions (2 points per question, ***30 points)

Answer the following questions according to the picture on the right.

(1) The latitude of direct sunlight is called.

(2) The solar terms of this day are.

(3) What season is it in the northern hemisphere? Variation of day and night length

Because.

37. The following is a passage from an imaginary composition written by a classmate. Please write down three mistakes in the article according to what you know:

65438+February 22nd, I was reviewing my lessons, and suddenly all the friction and air resistance disappeared. I tiptoed lightly and people flew. Flying and flying, I came to the North Pole and saw some lovely polar bears playing in the snow under the sun. Flying up again, I looked down and found that the earth turned clockwise from east to west. ...

The error is: (1)

(2)

(3)

38. Liang Liang's brother is doing military service in Xinjiang. At eight o'clock in the evening, Liang Liang of Jinhua reviewed his lessons and got ready for bed. At this time, his brother called from Xinjiang: "... it's only a little after six." Why do you go to bed so early? We just finished eating! " Liangliang is confused: it's obviously past eight o'clock. Why did my brother say it was past six? Please help him explain why. (4 points)

39. "Hemp house, red curtains, there is a white fat man living in it." This is a riddle about peanuts. Please answer according to the picture below:

(1) 2 in the diagram will develop into;

(2) People's practical peanut oil mainly comes from the map (fill in the serial number);

(3) 1, 2, 3 and 4 in the picture together are the "white fat man" in the riddle, which is called the larva of a new plant.

40. In the figure below, A, B and C are three contour topographic maps, and D, E and F are actual topographic sketches (the shaded parts indicate mountains or highlands). Please match them one by one with short lines:

Four. Experiment and inquiry: (* *15)

4 1. As shown in Figures A and B on the right, the two inclined planes are the same, and the materials on the plane are wood and cotton respectively. A car glides freely on the same height of two inclined planes, and then stops at the position shown in the figure. According to the above experimental phenomena, please answer:

(1) The car stops after moving a certain distance on the plane.

The reason for coming down is: (2 points)

(2) The purpose of this experiment is to

. (2 points)

③ In the above experiment, if the plane is made of ideal and smooth material,

When the car slides down the slope, the movement of the car on the plane will

Yes (2 points)

42. Objects fall from the air faster or slower. Some people say that the speed at which an object falls is related to its mass. Objects with large mass fall fast, while those with small mass fall slowly. What other factors do you think may be related to the falling speed? (Write at least two) (2 points)

Next, let's study the relationship between the falling speed of an object and the quality of the object:

(1) Q: Is the falling speed of an object related to its mass?

(2) Establish the hypothesis that the object with large mass falls faster than the object with small mass.

(3) Experimental verification and data collection: (Xiaoming and Jason Chung do experiments respectively)

Xiaoming picked up an object from his left and right hands and let it fall on the roof together. ...

(a) The variables that remain unchanged in the experiment are: (2 points)

The different variables are: (1)

(b) There are two ways to compare the speed of an object. The method used in this experiment is:

(2 points)

(4) By analyzing the data, it is concluded that Xiao Ming has done 10 experiments repeatedly and drew a line chart (two curves represent two objects respectively). From the chart,

The overall analysis can be summarized as follows: (2 points)

Instead of doing this experiment, Jason Chung conceived a simple thinking experiment: suppose a heavy object and a light object fall at the same time. If these two objects are linked together, two conclusions will emerge:

A. A heavy object carries a light object, and the light object obstructs the heavy object, and its falling time is the middle value of the respective falling times of the two objects;

B Together, two objects will be heavier than any one, and the falling time will be shorter than any one.

Are these two conclusions contradictory? ( 1)

From Xiao Zhong's thought experiment, we draw the conclusion of (1).

In the second semester of the 2006 school year, students studied self-test unit exercises in the seventh grade of science.

(Final examination paper)

First, multiple-choice questions:

1-5.BCCCC 6- 10。 ABBBD 1 1- 15。 ADAAC 16-20。 ACDBB 2 1-25。 CABBA

Second, fill in the blanks:

26.30 27. Fracture 28. Asexual reproduction The refraction is reduced by 30. Equal to 3 1. Equal to 32. 100.

Constant 0 33. Muscular, long beard, prominent Adam's apple; Fat increase, pelvic enlargement, breast development, etc. 34. 1 35.438+0

Third, analyze and explain the problem.

36.( 1) Tropic of Cancer (2) Summer solstice (3) Summer days are long and nights are short. 37.( 1) I stood on tiptoe and people flew. (2) When I came to the North Pole, I saw some lovely polar bears playing in the snow under the sun.

(3) Looking down, we find that the earth rotates clockwise from east to west. 38. Xinjiang and Jinhua are located in different time zones, so their time zones are different. 39.( 1) Stem and leaf (2) 1 (3) embryo 40. A-FB-DC-E

Fourth, experiment and inquiry:

4 1.( 1) The trolley is subjected to the horizontal friction towards it. (2) The relationship between the moving distance of the trolley and the horizontal friction. (3) The car will always move in a straight line at the same speed. (Uniform linear motion)

42. The shape of the volume (as long as it is reasonable) (1) The shape and volume should be the same. (b) The same distance is longer than time. Whoever has less time will walk fast. (4) The falling speed of an object has nothing to do with the quality, but it has nothing to do with the quality.

Midterm examination paper

I. Fill in the blanks (2 points for each question, ***24 points)

1. It is known that the circumference of △ABC is 25cm, and among the three sides A, B and C, a=b and c∶b= 1∶2, then the length of the three sides a=,

b=，c=。

2. As shown in the figure, P is a point on the bisector OC of ∠AOB, and PD⊥OA,PE⊥OB,

The vertical feet are d and e respectively. In the figure, * * * has a pair of congruent right triangles.

They are.

3. Figure (2) is an image obtained by similar transformation of the existing graph (1), so a=,

4. In traditional wooden houses in China, windows are often decorated with various patterns, as shown in the figure, which is a common pattern.

There is an axis of symmetry.

5. As shown in the figure, △ABC is an equilateral triangle with a side length of 2cm, and D is the midpoint of BC. Rotate △ADC around point A by 600 to get △AEB, then ∠ABE=, BE=,. If DE is connected, △ADE is a triangle.

6. The right triangle is also transformed, each side is enlarged to 3 times of the original, and the enlarged graphic area is 2 times of the original.

7. Design a touch game with four balls, which makes it easier to touch the white ball than the red ball. You can put a black ball, a white ball and a red ball in the box.

8. Throw an even dice, and each side of the investment is marked with 1, 2, 3, 4, 5, 6. Then the probability that the number of points less than 3 is up is.

9. Please write a set of binary linear equations with solutions.

10. It is a system of binary linear equations about x and y, so a, b=, c=.

1 1. It is known that the solution of binary linear equations is also the solution of equation 7mx-4y=- 18x, then m=.

12. Triangle ABC is an equilateral triangle (triangle with three equal sides).

The algebraic expression representing its side length has been marked in the figure, so the value is 2(x2+y2-xy-7).

The value is.

Second, multiple-choice questions (2 points for each question, ***20 points)

1. As shown in the figure, △ ABC △ bad, A and B, C and D are the corresponding vertices respectively.

If AB = 6 cm, BD = 7 cm and AD = 4 cm, then the length of BC is ().

6 cm long and 5 cm wide.

About 4 cm in diameter, uncertain.

2. Known △ ABC△ a? c？ b？ , ∠B and ∠C , ∠C and ∠B? Is the corresponding angle, then

①BC= C？ b？ ;

② The bisector of ∠ C and ∠B? The bisector is equal;

③ What is the height and a on the side of AC? b？ The height of both sides is equal;

4 the midline on the side of ab and a? c？ The median lines on both sides are equal ()

1。

3. As shown in the figure, AB‖CD, AC‖BD, then congruent triangles has () in the figure.

A.4 to B.3 to C.2 to D. 1 right.

4. As shown in the figure, in △ABC, AD⊥BC is in C,BE⊥AC is in E, and the following statement is wrong ().

A.FC is the height of △ABC, and B.BE is the height of △ABC.

C.AD is the height of △ABC, and D. BC is the height of △ABC.

5. Among the following four kinds of graphics, the one that cannot be translated by basic graphics is ().

6. As shown in the figure, △BEF is translated by △ABC, and points A, B and E are on the same straight line.

If ∠F=700 and ∠E=680, ∠CBF is ()

AD 420 BC 680 BC 700 BC cannot be determined.

7. The possibility of buying movie tickets at will, where the seat number is a multiple of 3 and the seat number is a multiple of 5 ()

A.it is a multiple of 5. B. equal opportunities. C.it is a multiple of 3. D. can't be sure

8. There is a two-digit number, and the sum of the digits on the ten-digit number and the digits on the one-digit number is 5, so such a two-digit number has ().

A.3 B.4 C.5 D.6

9.sum is the solution of equation y=kx+b, so the values of k and b are () respectively.

A.- 1.3 b . 1.4 c . 3，2 D.5，-3

10. It is known that a ship has a deadweight of 600 tons and a volume of 2400m3. There are two kinds of goods to be loaded now, one is the volume of 7m3 per ton, and the other is the volume of 2m3 per ton of B. How to load the goods can make the best use of the load and volume of the ship. If goods A and B are x tons and y tons respectively, the equation set is ().

A.B. C. D。

Iii. Answering questions (***46 points)

1. Solve the following equation (16 points)

( 1) (2)

(3) (4)

2. As shown in the figure, given line segments A and B and ∠ α, find △ABC so that ∠B=∠α, AB=a, BC=b, (5 points).

3. As shown in the figure, in Rt△ABC, the bisector of ∠ ACB = RT ∠ and ∠ CAD intersects with the extension line of BC at point E. If ∠B=350, find the degrees of ∠BAE and ∠E (6 points).

4. The quality samples of a batch of suits are as follows:

The number of random samples is 200 400 600 80010001200.

The quantity of genuine products is180 390 576 768 9601176.

(1) What is the probability that there is a set of defects in this batch?

(2) If you want to sell 2,000 suits, how many sets should you buy at least for the convenience of customers who bought defective suits? (6 points)

5. qingyun middle school plays basketball "three-point king" game. The following table shows the test results of basketball players throwing three-pointers:

Shooting time10 50100150 200

Number of hits 9 40 70 108 144

(1) According to the above table, what is the probability of an athlete hitting a three-pointer?

(2) According to the above table, if an athlete has 50 chances to throw three-pointers, how many points is he expected to get? (7 points)

6. A milk processing factory has 9 tons of fresh milk. If sold directly in the market, you can make a profit of 500 yuan per ton. If you make yogurt, you can make a profit of 1.200 yuan per ton, and if you make milk tablets, you can make a profit of 2000 yuan per ton. The production capacity of this factory is: if it is made into yogurt, it can process 3 tons per day, and the milk slices can be processed 1 ton. Due to personnel constraints,

Option 1: Make as many pieces of milk as possible and sell the rest directly.

Option 2: Make part of it into milk slices and the rest into yogurt, which can be sold in exactly 4 days.

Which scheme do you think is more profitable? Why? (8 points)

7. When solving the equation, due to carelessness, A misread A in the equation and got the understanding, while B misread B in the equation and got the understanding.

(1) What does A see and what does B see?

(2) Find the correct solution of the original equations. (8 points)