1. Multiple choice questions (This article is divided into Volume I (multiple choice questions) and Volume II (non-multiple choice questions). Full score on the test paper 100. The examination time is 90 minutes.

There are *** 10 questions in this big topic, with 2 points for each small topic and 20 points for each small topic. Of the four options given in each question, only one is the most appropriate.

1. Arranged according to the size of objects from big to big, the following statement is correct ().

A. Earth-solar system-universe-galaxy

B. Earth-solar system-galaxy-universe

C. Universe-Galaxy-Solar System-Earth

D. galaxy-universe-solar system-earth

2. A teacher guides students to understand the microstructure of solids, liquids and gases, and leads them to play games. The state of employing people is similar to that of things, as shown in figure 1. Scenes A, B and C correspond to () respectively.

Figure 1

A. solids, liquids and gases B. gases, solids and liquids

C. Solid, gaseous and liquid D. Liquid, gaseous and solid

3. The following data, the closest to the height of ordinary middle school students is ()

A. 160 cm

C. 1.60 km

4. In physics, the way to obtain Newton's first law of motion is ().

A. Simple experimental method B. Simple reasoning method

C. Method of mathematical deduction D. Method of experiment plus reasoning

5. Geosynchronous satellite is fixed at a position above the equator. For this phenomenon, the following statement is correct ()

The synchronous satellite is fixed above the equator with the sun as the reference.

Synchronous satellites are fixed above the equator, with the earth as the reference.

C if you observe the earth from a geosynchronous satellite, it is spinning.

If you observe the sun on a synchronous satellite, the sun is stationary.

6. Xiao Wang looked at the table below and drew some conclusions, of which the correct one is ().

Density of some substances/

water

Mercury

ice

Dry pine

paraffin

steel

alcohol

lead to

A. different substances must have different densities.

The density of solids is higher than that of liquids.

The density of the same substance in different states is generally different.

D solid copper block and solid lead block with equal mass, with the volume of copper block smaller than that of lead block.

7. If an object moves in a straight line at a uniform speed and travels for 20m in 4s, its speed in the first 2s must be ().

A. 10/0m/sec B. 7.5m/sec C. 5m/sec D. Not sure.

8. The following facts, belong to the object movement state change is ()

A. Pull the spring hard, and the spring becomes longer.

B. paratroopers descend in a straight line at a constant speed in the air.

C.the train stops at the station

D. the javelin thrown by the athletes moves forward in the air.

9. Xiao Cong came home from school and found that a small piece of the weight used by Grandpa for business had fallen off. He used this scale to weigh 1kg soybeans, so the real quality of these soybeans should be ()

A. less than 1kg B. greater than 1kg C. equal to 1kg D. it is impossible to judge.

10. The sports channel of CCTV often plays some important chess and Go games. When the explanation is repeated, the chess pieces are adsorbed on the vertically placed magnetic chessboard and remain still, as shown in Figure 2. At this time, the friction force on the chess piece is ().

A. the direction is vertical and upward, and the size is equal to its gravity.

B. the direction is vertical downward, and the size is equal to its gravity.

C. the direction is vertical and upward, which is greater than its gravity.

D. the direction is vertical downward, which is greater than its gravity.

2. Multiple-choice questions (4 questions in this big question * * *, 3 points for each small question, * * 1 2 points) If one or several of the four options given in each small question meet the meaning of the question, all the options are 3 points, and those that are not complete are1point, and those that are not selected or wrong are zero points.

1 1. In the following cases, the density will change ().

A.a bucket of water is used to water the flowers.

B, heating water to 0-90 DEG C.

C, the volume of a certain mass of gas doubles.

Put the water bottle in the refrigerator and let the water freeze.

12. A car is driving in a straight line at a constant speed. Regarding the description of force, the following statement is true ().

A. The gravity of the car and the supporting force of the ground on the car are a pair of balancing forces.

B The gravity of the car and the pressure of the car on the ground are a pair of balancing forces.

C. the traction of the car and the gravity of the car are interactive forces.

D the pressure of the car on the ground and the supporting force of the ground on the car are interactive forces.

13. As shown in Figure 3, under the action of horizontal force F, a uniform wooden stick with a weight of g makes the wooden stick rotate counterclockwise. In the process of increasing the angle between the stick and the vertical direction, the following statement is correct ().

A. with the increase of tensile force f, the moment arm f becomes smaller.

B. when the pulling force f remains constant, the arm of force f becomes larger.

C. when the gravity g remains constant, the arm of force of g becomes smaller.

D. when the gravity g remains constant, the arm of force of g becomes larger.

14. The S-T images of car A and car B are shown in Figure 4, from which it can be seen that ()

A.A and B both move in a straight line at a constant speed.

B.A car remains stationary, and the speed of B car is 2m/s.

C. After 6 seconds from time 0, the distance between car A and car B is 2m.

D. After 6 seconds from time 0, the distance between car A and car B is 12m.

Volume 2 (non-multiple choice questions ***4 major questions ***68 points)

3. Fill in the blanks (this big question * * 12 small questions, 2 points for each small question, 24 points for * * *)

15. Feel the physics around you and fill in the appropriate units.

(1) The quality of your classmate is around 60;

(2) The quality of the physics textbooks we use is about 200.

16. When playing football, the object that exerts force on the ball is also exerted by the ball.

17. The stopwatch reads as shown in Figure 5, and the stopwatch reads minutes and seconds.

18. As shown in Figure 6, the gravity of objects A and B is 120N, ignoring the self-weight and friction of pulleys and ropes. When objects a and b are lifted with uniform force, it is n, and it is n. ..

19. An oval thick glass bottle is filled with water. The glass tube is inserted into the glass bottle through a rubber stopper with holes (as shown in Figure 7), and the glass bottle is squeezed with both hands. What we see is that this phenomenon shows that.

20. Inferior rubber is hard, and it will slip when wiping words, and the words will not be cleaned. This is because the smoother the surface, the greater the friction.

Because. Xiao Ming didn't clean the words with a good eraser, and then he wiped them a little hard. This is achieved by increasing the friction between the eraser and the paper.

2 1. A classmate used the method shown in Figure 8 to measure the diameter of thin steel wire: tightly wound the thin steel wire on a pencil for 50 turns, and then measured it with a scale. It is found that the length of the coil is cm and the diameter of the thin steel wire is mm. ..

22. In the labor class, Xiaohong vertically lifted a stone weighing 385N with a force of 400N N. The resultant force on the stone is N and direction.

23. As shown in Figure 9, an object with mass m=5kg moves in a straight line at a speed of 2m/s on a horizontal plane under the action of force F. If the pointer of the spring dynamometer is 2N, the pulling force f is n, and the friction force on the object is n ... (Not counting the friction force between pulleys and ropes and the weight of pulleys and ropes).

24. All kinds of scissors are paired levers. As shown in figure 10, it should be the most suitable for cutting iron sheets, and it should be the most suitable for paper-cutting or cloth. (Select "A", "B" or "C")

25. As shown in figure 1 1, the box weighs 800N, and the weight of each moving pulley is 80N. If you don't count the weight and friction of the rope, you must at least pull n to lift the box; Vertical downward movement distance of free end of rope from lifting height of box (optional "greater than", "less than" or "equal to")

26. When we study the "lever principle", we know that Archimedes has a grandiose saying-"Give me a lever and a fulcrum, and I will move the earth" (Figure 12). Xiao Gang became interested in this. He looked up relevant information and knew that the gravity on the earth is: when using a lever, if the force is twice the resistance, then the distance that the force moves is n times the distance that the resistance moves. Please help Xiao Gang calculate: Assuming that the fulcrum is away from the earth 1m, Archimedes' maximum pressure on the lever is 600N, and Archimedes needs a light lever about m long. Even if Archimedes presses the lever at a constant speed of 100km/h (equivalent to the speed of a car in expressway), it will take several years to pry the earth up by 0.0 1m (about 1 year).

Four. Drawing and short answer questions (this big question is ***3 small questions, ***8 points)

27. As shown in Figure 13, pry the stone with a crowbar. Point A on the lever is the point of force, which can be up, down or in other directions. When the power direction is downward: Please

(1) Mark the fulcrum o of the lever on the diagram;

(2) Use the minimum force f to pry the stone on the lever.

28. as shown in figure 14, draw the gravity of object a on the inclined plane and the pressure of object a on the inclined plane.

29. People who walk will fall forward when their feet stumble over stones. Why?

Verb (abbreviation of verb) experimental problem (this big problem is ***2 small problems, *** 10)

30. In the experiment "Measuring the density of liquid":

(1) When the pallet is used for leveling, the balance should be placed on a horizontal desktop, and the travel code should be moved to the "0" point at the left end of the balance. When the pointer is stationary, if the pointer is found to be located on the left side of the center of the indexing plate, the balance nut (optionally "left" or "right") should be adjusted to balance the beam.

(2) Weigh the liquid with the adjusted balance, pour the liquid into a beaker, weigh the total mass of the cup and the liquid as 70g, and pour part of the liquid in the cup into a measuring cylinder, as shown in figure 15 (A). When weighing the total mass of beaker and residual liquid again, it is found that adding and subtracting weights can never balance the balance, so the balance should be moved. If the balance is rebalanced, the positions of the weights and offset codes used are shown in Figure 15 (b). Then the mass of the liquid poured into the measuring cylinder is g, the volume of the liquid in the measuring cylinder is, and the density of the liquid is.