Fill in the blanks in mathematics for senior high school entrance examination

Grade 3 (6) Physics Review Exercise (90 minutes)

(Comprehensive 1) March 2002

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Class (in English)

1. Multiple-choice questions (2 points for each question, *** 16 points) Only one of the following four options in each question meets the meaning of the question.

1. Among the following four phenomena, the one that belongs to the refraction of light is: ()

A. the formation of shadows B. seeing that the water in the swimming pool is shallower than it really is.

C. the beautiful white tower is reflected on the water. D. pinhole imaging

2. The following example can reduce the pressure is ()

A. The egg cutter is made of very thin steel wire.

B.sharpening a knife can cut vegetables easily.

C. the tip of the thumbtack is easy to press into the board.

D. Big trucks have more wheels than ordinary cars.

3. Two cars drive from Beijing to Tianjin along the same road, and their average speed from Beijing to Tianjin is equal, so ()

Attendant: Their driving time from Beijing to Tianjin must be the same.

B.they always drive at the same speed on the road.

C. the speed of the two cars on the way must be the same.

If two cars are driving on the road at the same time, the distance between them must be constant.

In order to call each other conveniently, both offices are equipped with electric bells, so that when either party presses the switch, only the other party's electric bell rings. The correct circuit in Figure A- 1 is: ().

5. As shown in Figure A-2, two identical test tubes contain liquids with equal mass, with tube A placed vertically and tube B placed obliquely, and the liquid levels of the two test tubes are flat, then the relationship between the pressure of the liquids in the two test tubes and the bottom of the test tube is: ().

A.B.

C.d., all three situations are possible.

6. Put the same cube into three liquids, A, B and C, as shown in Figure A-3, and the following judgment is correct: ()

A. an object is under the pressure of a liquid.

B. Liquid density

C. the lower surface of the object is under the pressure of the liquid.

D. the lower surface of the object is subjected to the pressure of the liquid.

7. As shown in Figure A-4, when S is closed and the slider P slides to the left, the following statement is true ().

A the voltmeter shows the same number, but the ammeter shows a larger number.

B. The voltmeter indicator remains unchanged, while the ammeter indicator becomes smaller.

The voltmeter indicates bigger, and the ammeter indicates bigger.

D. The indication of voltmeter becomes smaller and the indication of ammeter becomes larger.

8. In the circuit shown in Figure A-5, the voltage at both poles of the power supply is constant, and the circuit works normally when the switch S is closed. After a period of time, it is found that one of the voltages is getting bigger, so ().

A. the light e may light up.

B. the brightness of the lamp e may not change.

C. the resistance r may be short-circuited.

D. the resistance r may be open.

Second, multiple-choice questions (3 points for each question, ***6 points) Among the four options for each question below, there is more than one option that meets the meaning of the question.

9. As shown in Figure A-6, the bulbs are marked with "24V8W" and "24V 16W", and the voltage at both poles of the power supply is always 24V. After the switch is closed ().

A. the ammeter is the same as the indicator.

B the reading of the ammeter is1a.

C. the reading of ammeter is about 0.67a.

D. the reading of voltmeter v is 24V.

10. When the plastic ball and the wooden ball are connected by a string and put into the water, the volume of the wooden ball exposed from the water is 3/8 of its own volume; As shown in Figure A-7, when the string is cut, the plastic ball sinks to the bottom, and the volume of the wooden ball exposed from the water is 1/2 of its own volume. At this time, the supporting force of the plastic ball to the bottom of the pool is F. If the volume ratio of the plastic ball to the wooden ball is known as 1: 8, then ().

A.the gravity of the wooden ball is 4F.

B. the buoyancy of the plastic ball is F.

C. the density of plastic balls is

Before and after the rope is cut, the difference between the total buoyancy of two objects is 2F.

Three, drawing questions (*** 12 points)

1 1. As shown in Figure A-8, AO is the incident light of MN on the glass surface. Try to draw the corresponding reflected light and refracted light.

12. As shown in Figure A-9, draw the refracted ray of light passing through the lens;

13. according to the imaging characteristics of plane mirror, draw the image of object AB in plane mirror MN in figure A- 10:

14. as shown in figure A- 1 1, pull the arm l of force f to the fulcrum o.

15. as shown in figure A- 12, the weight of object a placed on the inclined plane is 20 N, and the schematic diagram of its gravity is drawn with the scale given in the figure.

16. In Figure A- 13, mark the N and S levels of the small magnetic needle around the energized solenoid.

Iv. Experimental questions (* *10)

17. Fill in the measurement results according to the measurement results shown in Figure A- 14:

(1) The length of the block is _ _ _ _ _ _ _ _ cm. (2) the thermometer reading is _ _ _ _ _ _ _ _℃

18. There is a rectangular uniform thin aluminum sheet, and its thickness can be measured with a balance and a scale. The practice is:

(1) Measure _ _ _ _ _ _ _ _ _ _ with a balance.

(2) Measure _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ with a scale.

(3) According to the density table, the density of aluminum is ρ.

Then the thickness of aluminum plate d = _ _ _ _ _ _ _ _ _ _ _ _

19. Give you a power supply (the voltage at both poles is about 3 volts, and the voltage is constant), an ammeter, a switch, a sliding rheostat marked "20 ω 2a" and several wires. Try to measure the resistance of the unknown resistor by connecting the circuit only once. Requirements:

(1) Draw the experimental circuit diagram.

(2) Briefly describe the experimental steps and physical quantities to be measured.

(3) Write the expression of calculation.

5. Fill in the blanks (***36 points) (20~27, 1 point per space; 28~33, 2 points each time, 34, 35, 3 points each time. )

20. The pebbles thrown into the air are affected by _ _ _ _ _ _ _ _ _ _ _

21.1In the 1940s, an Italian scientist _ _ _ _ _ _ _ first measured the atmospheric pressure through experiments. If the atmospheric pressure in a place is measured as Pa, the boiling point of water in that place is _ _ _ _ _ _ _ _ _ _ _ at 100℃.

22. A person is 5 meters in front of a flat mirror placed vertically. When he is close to the flat mirror, his image size in the mirror will be _ _ _ _ _ _ _ _ _.

23. When the generator is working, _ _ _ _ _ _ _ _ can be converted into electric energy.

24. The earth, graphite, salt water, glass rod of these four objects, belongs to the insulator is _ _ _ _ _ _.

25. 100g after hydrogen is completely burned, the heat of coke is released, and the combustion value of hydrogen is _ _ _ _ _ _ _ _ coke/kg.

26. Drop a few drops of ether into the bottle and plug it with a plug. As the evaporation of ether produces ether vapor, air is pumped into the bottle through the opening on the plug. When the bottle stopper jumps up from the bottle mouth, you can see the fog in the container. This is because the internal energy of the gas in the bottle is _ _ _ _ _ _ _ _.

27. Xiaoming went down the river by boat. He saw the water near the ship flowing upstream. He observed the water flow with _ _ _ _ _ _ _ as a reference.

28. When the car is moving and brakes on its own, it cannot stop immediately because of _ _ _ _ _ _ _ _.

29. When ice becomes water, its volume becomes _ _ _ _ _ _ _. ( )

30. The power ratio of A and B machines is 3: 2, and the time ratio for doing the same work is _ _ _ _ _ _ _.

3 1. The wooden block weighing 20 cows is pressed by the horizontal force of 15 cows to slide down on the vertical wall at a uniform speed, and the friction force on the wooden block is _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _; Given the contact area between the block and the wall, the pressure of the block on the wall is _ _ _ _ _ _ _ _ _ _ _ _ _ _.

32. As shown in Figure A- 15, there is water in the container, and the pressure generated by water at A is _ _ _ _ _ _ _ _ _ _ PA.

33. The candle flame is placed 30 cm away from the convex lens on the spindle, and an enlarged image is obtained on the screen, from which it can be judged that the focal length f of the convex lens should be _ _ _ _ _ _ _ _ in 15 cm.

34. As shown in figure A- 16, an object G is lifted with a pulley block at a uniform speed, and the pulling force F used is f = 300 N. If the object rises 2 meters within 1 s, the mechanical efficiency given by the pulley is _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

35. In the circuit shown in Figure A- 17, the voltage at both ends of the power supply is constant, the fixed resistance is 10 ohm, and the ratio of the total current intensity of the main circuit before and after the switch S is closed is 2: 3, so the resistance is _ _ _ _ _ _ _ _ _ _.

36. As shown in Figure A- 18, AB is a light lever, O is its fulcrum, and iron hooks are hung at both ends, so the lever is just balanced in the horizontal position. If the hook code at the A end is immersed in water and the hook code at the B end is immersed in alcohol, move the fulcrum O to keep the lever balanced in the water. ( , )

37. As shown in Figure A- 19, when the circuit and switch S are closed, the lamp E just shines normally, and its power is 3 watts. Change the position of the sliding vane of the sliding rheostat, so that the indication of the ammeter becomes the original 1/2, and the power of the lamp is _ _ _ _ _ _ _ _ _ _ _. (assuming that the resistance of the filament is constant)

Six, the calculation problem (20 points)

38. Cool the copper block with the mass of 100g and the temperature of 200℃ to 100℃. How much coke heat does the copper block release? [The specific heat of copper is known as coke /(kg? ℃)]

39. The water container has a uniform cuboid block with a bottom area and a cross-sectional area, which is fixed at the bottom of the container by thin wire traction; Fill the container with water. When the length of the wood block immersed in water is 5cm, the water depth in the container is 15cm, and the tension of the thin wire is just zero, as shown in Figure A-20. Q: (1) What is the pressure of water on the bottom of the container at this time? (2) The maximum tensile force that the thin thread can bear is 4.9 N. How much water will continue to be injected into the container, and the thin thread just breaks? (3) What is the pressure of water on the bottom of the container when the wood block is still after the thin thread is broken?

40. A classmate installed an electric water heater at home. The following table shows the nameplate on the water heater.

Rated power 1800 w

Rated voltage 220 volts

Rated frequency 50Hz

Rated capacity 30L

(1) How many amperes is the rated current of this classmate's electric energy meter, fuse and other equipment larger than before using this water heater?

(2) If 30 liters of water in the water heater is heated from 20℃ to 80℃, the heat of coke is needed. How long does it take for the water heater to be electrified if the heat loss is not counted?

4 1. The DC motor and ammeter used in the experiment are connected in series with the power supply, and the voltage between the two poles of the power supply is 6 volts. When the switch is closed, the motor does not rotate. At this time, the ammeter reads 5 amperes. After inspection, it was found that the motor shaft was stuck. After troubleshooting, the motor rotates. At this time, the reading of the ammeter is 1 amp. From this, what is the mechanical power of the current?

Reference answer:

I. Multiple choice questions

1.B 2。 D 3。 A 4。 C 5。 B 6。 C 7。 D 8。 D

Second, multiple choice questions

9.b、D 10。 A, B and C

Three, drawing questions (omitted)

Fourth, the experimental questions

17.( 1)4.3 (2)-23

18.( 1) mass m (2) length a and width b (3)

19. Steps:

1. Close the switch S, move the slider of the sliding rheostat to the far left, so that the resistance of the access circuit is zero, and record the indication of the ammeter at this time.

2. Move the sliding vane of the sliding rheostat to the extreme right, so that the maximum resistance of the access circuit is 20 ohms, and record the indication of the ammeter at this time.

Verb (abbreviation of verb) fills in the blanks.

20. heavy, earth

2 1 torricelli, low.

22. unchanged

23.machines

24. glass rod

25.

26. Expansion does work and the temperature drops.

boat

inertia

29.0.9

30.2:3