1. In a hotel in a rectangular room, in order to make guests feel spacious indoors, the master of a wall mounted on one wall with the wall as large as the plane mirror, which is the use of ______________ principle to achieve this purpose. This makes people feel the size of the room for the original _____________ times.

2. There are the following phenomena: (1) after washing your hair, blowing hot air with a hairdryer than blowing cold air hair dry fast; (2) wet clothes spread out to dry in the sunlight than drying in the shade of the trees dry fast; (3) summer rain after the asphalt dry faster than in winter. These phenomena show that: the speed of evaporation and _____________ related; in the process of the above phenomena, these water are to __________ heat.

3. A piece of ice with a mass of 1.8kg, its density is , its volume is __________________ , if this piece of ice completely melted into water, the volume of water is ________________ .

4. Speed is a comparison of the movement of objects __________________ physical quantity, its main unit "m / s" should be read as ____________________________________________________. The

5. The mass of an object is often measured __________________ in the laboratory. If the astronauts bring a small sample of ore from the moon to Earth, its mass will be _____________________.

6. When the incident light is incident at an angle of 55° to the water surface, as shown in Figure II-1, the angle of reflection will be _______________ and the angle of refraction will be less than __________________.

7. The Earth's synchronous satellites are ______________ relative to the ground and _____________ relative to the Sun. (Choose "motion" or "stationary")

8. a person riding a bike to 5m / s speed from east to west, then there is a car to 15m / s speed at the same time with the same place to the west at a constant speed, if the car as a reference, the person to the ___________________ movement, after lOmin with the car and the distance between _________________m.

9. The melting point of the sea wave material is 48 ℃, read __________________. 48 ℃ of the sea wave in the state is _____________m.

10. . = ________________ ; lm／s=___________km／h.

Second, single-choice questions

11. In the following examples, see is a solid image of the object is ( )

A. using a magnifying glass to observe the germ of a plant B. watching a movie

C. enjoying the goldfish in the aquarium D. the water of the The moon

12. The following measurements are basically true ( )

A. The thickness of a piece of paper is 0.6mm

B. An elephant can have a mass of up to

C. A person walks normally at a speed of about 1.2m/s

D. The height of a desk is about 0.8dm

13. The diameter of a particle of a substance is between 1 and l. The diameter of the particles is between 1 and 2m. A material is called a nanomaterial when its particles are between 1 and lOOnm in diameter: nanotechnology has a wide range of applications in the development of electrical

materials, optical materials, etc.

Nanometer is a measure of which of the following quantities? Nano is the unit of measurement of which of the following quantities? ( )

A. Length B. Volume C. Density D. Speed

14. The following statements about sound are correct ( )

A. The source of the sound must be vibrating

B. Sound travels in a vacuum

C. Noise is pleasant to hear

D. Sound travels at equal speeds through different substances

15.

15. The following about density and the application of the correct account is ( )

A. A brick cracked, broken bricks will become smaller

B. refers to the

C. , that the mass of pure water is

D. the average density of air, it can be assumed that an ordinary classroom air mass of about 10kg

16. the Spring Festival you want to To take pictures of your family, the family to the camera lens distance u must meet what conditions ( )

A. >f B. >2f C. = 2f D. >f and <2f

17. A, B two solid ball volume ratio of 5:3, the mass of the ratio of 5:2, the ratio of the density of the two balls of A and B is ( )

A 25:6 B. 3:2 C. 2:3 D. 6:1

18. the use of scales to measure the mass of an object, if the weights used have been worn, the measured value than the true value ( )

A. big B. small C. the same as the big D. are possible

19. a classmate in the l00m race, run the whole course of the clock in 16s, describing the race of his fast and slow The correct description is ( )

A. He ran every second is 6.25m

B. He ran to the end of the speed of 6.25m / s

C. He ran 50 meters of the time taken for 8s

D. He ran the whole course of the average speed of 6.25m / s

20. three identical cups containing water, will be The same mass of aluminum, iron, copper () were put into the three measuring cups, the liquid level is exactly the same, the original water is the least amount of cups ( )

A. put the aluminum block of the measuring cup B. put the iron block of the measuring cup

C. put the copper block of the measuring cup D. the original amount of water is the same amount of water

21. the use of "dry ice" can be achieved "dry ice", "dry ice" can be achieved "dry ice" can be achieved "dry ice" can be achieved "dry ice" can be achieved "dry ice" can be used to achieve "dry ice" can be used to achieve "dry ice The use of "dry ice" can be achieved "artificial rainfall", "dry ice" scattered into the air after it will happen immediately after the change of state of matter is ( )

A. melting B. liquefaction C. sublimation D. vaporization

22. A. Errors are caused by inadequate measurement methods

B. Errors are caused by insufficient precision in measurement tools

C. Errors can be avoided by careful measurement with precise tools

D. Errors are unavoidable but can be minimized

23. In winter, we often see the breath coming out of our mouths. We often see the mouth exhaled "white vapor", which is actually ( )

A. water vapor B. carbon dioxide gas

C. small drops of water D. liquid carbon dioxide

24. in the "observation of boiling water" In the experiment to see a bubble in the process of rising volume in the smaller, can be inferred that this is in ( )

A. before boiling B. boiling C. can not be judged

25. a beam of light from the glass into the air perpendicularly, the angle of incidence, the angle of refraction in degrees ( )

A. 90 °, 90 ° B. 90 °, 0 °

C. 0 °, 0 ° D. 0°, 90°

26. the mass of 20g bottle, filled with water, the total mass of 30g, if the total mass of 27.5g after filling the oil, the density of this oil ( )

A. B.

C. D.

27. the focal length of the convex lens is 15cm, if the object is placed in the focal point of the spindle at 5cm outside the focal point, then the image must be ( )

A. Orthostatic magnification of the virtual image B. Inverted magnification of the virtual image

C. Inverted reduction of the real image D. Inverted magnification of the real image

28. a train 210m long, through the 690m of the cave, if the speed of the car for the 5m / s, it is completely in the cave in the time experienced by the ( )

A ． 138s B ． 180s C ． 96s D ． 42s ．96s D．42s

29. uniform linear motion speed formula, it said ( )

A. v is proportional to s B. v is inversely proportional to t

C. the longer the distance of the movement, the greater the v D. s is a constant value of the ratio of s and t

30. a beam of light through a nearsighted lenses, the refracted rays ( )

A. must be a convergent beam B. a converging beam B. a convergent beam C. a convergent beam D. a convergent beam D. a convergent beam D. a convergent beam D. a convergent beam D. a convergent beam D. a convergent beam D. a convergent beam D. a convergent beam A. must be a converging beam B. must be a diverging beam

C. must be a parallel beam D. both possible

1. plane mirror image 2

2. liquid surface, air flow, temperature absorption

3.

4.

4.

4.

4.

4.

4. fast and slow meters per second

5.

5. scales unchanged

6.

6.

6.

6.

6.

6.

7.

7. stationary motion

8. east 6000

9. 48 degrees Celsius solid, liquid, solid-liquid ****existence

10. 3.6

11. b 12. c 13. a 14. a 15. c

16. b 17. b 18. a 19. d 20. a

21. c 22. c 23. c 24. c 24. c 24. c 25. c 25. c 26. c 26. c 27. c 28. c 28. c 29. c 30. c 31. c 31. c 32. c 32. c 32. c 33. c 33. c 34. c 34. c 34. c 35. C 23. C 24. A 25. C

26. A 27. D 28. C 29. D 30. D