1, complete the following unit conversion:

3 tons = _ _ _ _ _ _ kg = _ _ _ _ _ = mg; 2m/s = _ _ _ _ _ _ _ km/h；

7.8 g/cm3 = _ _ _ _ _ kg/m3; 1 m = _ _ _ _ _ _ _ _ micron.

2. The sound is produced by the sound generator _ _ _ _ _. In solids, liquids and gases, the slowest sound wave propagation speed is _ _ _ _ _ _ _.

3. Celsius temperature is specified as follows: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

4, in the material melting, solidification, vaporization, liquefaction, sublimation, sublimation of several state changes, need to be heated is _ _ _ _ _. When a crystal changes from a solid state to a liquid state, it needs _ _ _ _ _ _ heat, but _ _ _ _ _ remains the same.

5. The light is perpendicular to the plane mirror. If the mirror rotates 150, the angle of reflected light is _ _ _ _ _ _ _.

6. Put a luminous point on the focus of a magnifying glass, and the light emitted by the luminous point will become _ _ _ _ _ light after passing through the magnifying glass. If the focal length of the magnifying glass is 10 cm and the distance from the observed object to the lens is _ _ _ _10 cm, the upright magnified virtual image of the object can be seen through the lens.

7. An iron plate with a thickness of 1cm has a mass of 3. 16kg and an area of _ _ _ _ cm2 (the density of iron is 7.9× 103kg/m3). 0. 1 m3 of ice melts into water, and the mass of water is _ _ _ kg (the density of ice is 0.9× 103 kg/m3).

8, a man shouted at the opposite cliff, 1.2 seconds later, he heard an echo. At that time, the temperature was 150C, so the distance from people to the cliff was _ _ _ _ _ _ _ _.

9. Light travels in a straight line in _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

10. When measuring the liquid temperature with a thermometer, all _ _ _ _ _ of the thermometer should be immersed in the liquid to be measured, and do not touch _ _ _ _ _ _ _ or _ _ _ _ _ _ _.

1 1, to adjust the sky level, first align the travel code with the zero scale line of the beam scale. Then adjust _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

Second, multiple-choice questions: (2 points for each question, ***40 points)

1 A passenger is sitting on a ship sailing against the current. We say that he is stationary with which of the following objects as the reference? :( )

A. cabin; B, river water; C. oncoming ships; D. trees on the river bank.

2. When an object moves in a straight line, the distance it passes in the first 5 seconds is12m, and the distance it passes in the last 5 seconds is18m, so its average speed during this time is: ()

First, 6 meters/second;

b，5m/s；

c，4m/s；

D, 3 meters per second.

3. For the "white gas" seen when boiling water, the correct statement is: ()

A, this is the water vapor generated when water boils;

B, this is a mixture of water vapor and air;

C, this is a small water drop condensed by water vapor;

D, this is a small water drop solidified by water vapor.

4. When drying the grain, it is best to spread it out and dry it, because: ()

A, the evaporation rate of liquid is related to the temperature of liquid;

B, the evaporation rate of liquid is related to the surface area of liquid;

C, the evaporation rate of liquid is related to the volume of liquid;

D, the evaporation rate of liquid is related to the air velocity on the surface of liquid.

5. The following statement is wrong: ()

A, the speed of variable-speed linear motion is related to the choice of distance and time;

B, the speed of uniform linear motion has nothing to do with the choice of distance and time;

C, the speed and direction of the object is related to the choice of reference objects;

D, the average speed of an object is the average speed of an object.

6. The temperature when the waves melt is 480C, so the waves at 480C: ()

A, it can only be solid;

B, it can only be liquid;

C, can only be gaseous;

D, which can be solid or liquid.

7. Two identical mercury thermometers, one of which is covered with a wet emery cloth soaked in alcohol, and then: ()

A, thermometer with wet emery cloth has a small reading;

B, with wet emery cloth thermometer reading is big;

C. The readings of the two thermometers are the same;

D, the conditions are not enough to determine.

8. Which of the following statements is true? :( )

A, water into ice to absorb heat;

B, the ice will melt at 00C;

C, water temperature is lower than 1000C, can't become steam;

D, adding fire to boiling water, the boiling of water is intensified, but the water temperature remains unchanged;

9. Which of the following phenomena is sublimation? :( )

A, pour the water on the red-hot iron, and the water will soon dry;

B, heating solid iodine to change iodine into purple gas;

C, the ice melts into water and then becomes steam;

D, rub some alcohol on your hands, and the alcohol will soon dry.

10, which of the following statements is correct about the propagation of light? :( )

A, light always travels in a straight line in the same medium;

B. The sunlight passing through the atmosphere in the morning is curved;

C, when the light irradiates the surface of the transparent medium from the air, the propagation direction will inevitably change;

D light travels faster in water than in vacuum.

1 1, indicating that light is reflected and refracted at the interface between air and glass, then: ()

A, MN is the air on the right; B, MN is the air on the left; C, the air is above EF; D, EF, there is air below.

12, when people are imaging in a flat mirror: ()

A, the closer a person is to a flat mirror, the bigger the image in the mirror;

B, the image in the flat mirror is always smaller than the actual person;

C, the image in the plane mirror is always bigger than the actual one;

D, no matter how far a person is from the flat mirror, the size of the image in the mirror is the same as the actual size.

13, about the camera, the following statement is correct: ()

A, when taking pictures, the real image on the film is inverted and reduced;

B, when taking pictures, the distance from the scene to the lens is less than 2 times the focal length;

C, when taking pictures, if the shot scene is close to the lens, the distance from the film to the lens should be adjusted closer to make the image on the film clear;

D. The lens of the camera is essentially a concave lens.

14, regarding density, the following statement is true: ()

A, the greater the mass of a substance, the greater its density;

B, the density of iron is the same on the earth or on the moon;

C, according to the density formula, the density is directly proportional to the mass of the object and inversely proportional to the volume of the object;

D, air also has density, and the value of air density will not change under any circumstances.

15, the statement about imaging is correct: ()

A, pinhole imaging is an upright real image;

B. The image of an object in a plane mirror is an isometric real image;

C, only if u > 2f, the object must become an enlarged real image through the convex lens;

D, just f

16, the mass ratio of two metal blocks A and B is 2:3, the volume ratio is 2: 1, and the density ratio of A and B is ().

a， 1:3； b，4:3； c，3:2； d，3: 1 .

17, with vernier caliper accurate to 0. 1mm, the length of an object is11.243cm. If this object is measured with a steel ruler with a minimum scale of millimeters, the measurement result is: ().

a、0. 1 1243m； b，0. 1 124m； c，0. 1 12m； d，0. 1 1 m。

18. First, use a thermometer to measure the temperature of A. If this thermometer has not been shaken, use it to measure the temperature of B and C. It is known that the actual temperatures of B and C are 37.50C and 38.50C respectively, so when measuring the temperature of B and C, the thermometer should read: ().

A, 37.50C and 38.50c; B, 380C and 38.50 c；;

C, 37.50C and 380 c；; D, 38.50C and 38.50c.

19. Regarding the concept of quality, the following statement is true: ()

A, the quality of an object is always related to its volume;

B, quality is the amount of substances contained in an object, so a large object has a large mass;

C, the quality does not change with the shape, shape and temperature of the object;

D, after the object is taken to the moon, the mass becomes smaller.

20. As shown in the figure, two plane mirrors A and B intersect at an angle of 300, and a beam of light is vertically directed to plane mirror A, then the reflection angles of the two plane mirrors A and B are: () respectively.

A, 900 and 600; B, 900 and 300; C, 00 and 600; D, 00 and 300.

Three, painting questions (5 points)

1, complete the following light path diagram.

2. Draw a suitable mirror in the box according to the light path.

Fourth, the calculation problem: (15 points)

1, the railway line between a and b is 2430 kilometers long. On the way from A to B, the train passes through a tunnel with a length of 1 050m, which takes1min10s. Requirements: (8 points)

(1) What is the average speed of the train passing through the tunnel? How many kilometers per hour?

(2) How many hours does it take for the train to drive from A to B at this average speed?

2. The hollow copper ball with a volume of 30 cm3 has a mass of 89 grams. After the hollow ball is filled with some liquid, the total mass of the ball is105g. What is the density of the injected liquid? The density of copper is 8. 9×103kg/m3) (7 points)

Verb (abbreviation of verb) experiment (10 mark)

1, when doing the experiment of "studying convex lens imaging", a classmate first moves the convex lens towards the sun to get a bright spot on the ground, and measures the distance from the bright spot to the convex lens with a scale, thus _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ In the experiment, the convex lens, candle and light screen should be placed on the optical bench, and the height of _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

2. When measuring the density of the metal block with a balance and a measuring cylinder, as shown in the left figure below, weigh the weight of the metal block with a balance. When the balance is balanced, the weight is placed on the right plate and the upstream code of the balance. As shown in the right figure below, measure the volume of the metal block with a measuring cylinder and put it in the position of the liquid level before and after the metal block. The numerical unit marked on the measuring cylinder is cm 3. Please read the data from the chart and fill in the table below with these data and calculation results.

Mass of metal block m (g) Volume of water before putting into metal block (cm3) Total volume of metal block and water V2 (cm3) Volume of metal block V = V2-V1(cm3) Density of metal block (g/cm3).

Questions and answers of intransitive verbs (5 points)

When people who wear glasses come out of air-conditioned rooms in summer, a layer of small water drops will appear on their glasses. Why?

Reference answer:

First, fill in the blanks

1, 3× 103, 3× 109, 7.2, 7.8× 103, 1× 106 2, vibration, gas 3, ice-water mixture,/. 400,908,204m9, homogeneous medium, 3× 108 m/s 10, glass shell, container wall, container bottom 1 1, balance nut, centerline.

Second, multiple-choice questions:

1，A 2，D 3，C 4，B 5，D 6，D 7，A 8，D 9，B 10，B 1 1，B 12，D 13，A 14，B 15，D 16，A 17，B 18

Fourth, the calculation questions:

1, (1)15m/s, 54km/h (2) 45h 2,0.8kg/m3.

Verb (abbreviation of verb) experimental problem;

1, measure the focal length of convex lens, convex lens, light screen, candle and light screen.

2, 54、25、45、20、2.7

Questions and answers of intransitive verbs:

Tip: this is liquefaction, because in summer, people with glasses come out of air-conditioned rooms. The temperature of the spectacle lens is low. When the water vapor around the spectacle lens is cold, the temperature drops, and it liquefies into small water droplets and sticks to the spectacle lens. So people who wear glasses come out of the air-conditioned room in summer, and a layer of small water drops will appear on the lens of the glasses.