Examination questions and answers in the third chapter of the first volume of junior two physics.

The following is an article about the examination questions and answers in the third chapter of the first volume of junior two physics for your reference!

Multiple choice questions (3 points for each small question, * * * 36 points)

1.4(20 12 Quanzhou). Among the following natural phenomena, the melting phenomenon is

A. In spring, the ice and snow melt. B.in summer, the dew is crystal clear.

C. autumn, foggy D. winter, heavy snow.

2.(20 12 Texas). The mountains and rivers of the motherland are picturesque all year round. The description in Figure 2 belongs to liquefaction.

3.(20 12 Harbin). In the process of the following phenomena, what needs to absorb heat is ().

A. In early spring, snow water forms an ice cone under the eaves. B. In midsummer, water evaporates in wetlands.

C. In autumn, dew forms on grass leaves at night. In winter, rime forms on the branches.

4.(20 12 Linyi). The description of physical phenomena in the picture below is correct.

5(20 12 Zhuzhou). This spring, the phenomenon of "resurgence" in Zhuzhou lasted for a long time, and the ground and walls were wet. This phenomenon belongs to

A. vaporization, liquefaction, sublimation and sublimation

6(20 12 header). The following statement is true ()

A. In the early spring morning, fog is formed by steam vaporization.

B. In the autumn morning, the frost on the grass on the ground is formed by the sublimation of water vapor.

C. In winter in the north, the "ice flower" on the glass window is condensed by water and steam.

D in the cold winter, when people talk outdoors, the "white gas" exhaled in their mouths is formed by condensation of water vapor.

7. The main physical changes corresponding to the scene of "Ice and Snow in Wan Li" are as follows

A. Vaporization and liquefaction B. Vaporization and sublimation

C. Solidification and sublimation D. Solidification and melting

8. In the following image, belongs to some kind of crystal solidification image is ().

9. During the May Day this year, the temperature plummeted, and tourists enjoyed a strange landscape at the top of Wudang Mountain, such as the blooming red flowers and green leaves covered with a thin layer of frost, as if covered with a layer of white gauze. The reason for this phenomenon is that

A. Water vapor in the air will liquefy when it is cold.

B. Water vapor in the air will condense when it meets condensation.

C. when the weather is cold, the water on the flowers will solidify.

D. the water on the flower evaporates and forms.

10. What will not happen in the scenario of Figure 5 is that

A. Figure A: Ice and snow melt in spring Figure B: Frost appears on trees in winter.

C.C.: Clothes frozen outdoors won't dry. D.D.: When water boils, there will be a lot of "white gas".

1 1.(20 12 Enshi). Fig. 3 shows the melting image of a substance. The following solutions to this image information

Wrong is:

A.this is a crystalline substance. The substance is in a gaseous state in the CD section.

C the initial temperature of this substance is 40℃

When heated for 5 minutes, the temperature of the material was 48℃.

12.(20 12 weihai). The indoor temperature is 20 degrees Celsius. At this time, the glass bulb of the thermometer was wrapped with cotton flowers soaked in a small amount of alcohol. With the rapid evaporation of alcohol, the image in Figure 2 that can correctly reflect the change of thermometer reading with time is as follows

Fill in the blanks (2 points for each blank, *** 46 points)

13.(20 12 Binzhou). As shown in the figure, the reading method of the thermometer is correct (fill in "A",

"b" or "c"), which means centigrade.

14.(20 12 Yancheng 0. The agricultural proverb says "it is cold before frost and cold after snow", implying that when the temperature is low, water vapor will bring frost.

Heat is needed in the process of snow melting to form water.

15. Before giving the patient an injection, the nurse disinfected the syringe with alcohol cotton balls, and the patient would feel cool here. This phenomenon shows that _ _ _ _ _ _ _; Thermometers are made of _ _ _ _ _ _ characteristics of liquid.

16.20438+00 The foggy weather in winter is more frequent than in previous years, but the frost is less. Fog is formed by water vapor in the air, and frost is formed by water vapor in the air (fill in the name of state change).

17. cold therapy is commonly used in medicine to treat traumatic pain. Its principle is that the doctor sprays a gaseous organic substance called chloroethane on the wound. This substance is _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

18. This chart shows the working principle of the refrigerator. The working principle of the refrigerator is to use a substance called freon as a hot "porter" to carry the "heat" in the freezer to the outside of the refrigerator. Freon is a substance, and it is easy to _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ The electric compressor compresses the freon vapor and presses it into the condenser tube of the refrigerator, where the vapor becomes liquid and _ _ _ _ _ _ _ ("endothermic or exothermic"), and the heat is taken away by the surrounding air. The liquid freon in the condenser enters the tube of the freezer in the refrigerator through a very thin capillary, where it vaporizes rapidly ("endothermic" or "exothermic"), which lowers the temperature in the refrigerator, and the generated vapor is pumped away by the compressor, pressed into the condenser, liquefied again and released the heat brought out by the refrigerator. . Freon circulates in this way, so that the temperature of the freezer can be kept quite low.

19.2065438+02 In March, British scientists developed a kind of "laser eraser", which was specially used to remove the black toner handwriting on white paper. Under laser irradiation, the black toner on the paper directly turned into high-temperature carbon vapor, and the handwriting disappeared at the same time.

20. The Arctic and Antarctic are the world of ice and snow. Although there is little precipitation, the air there is wetter than that in Beijing, because ice and snow can be turned into water vapor.

2 1.(20 12 Linyi) Xiaowen observed that the temperature of the substance in the test tube remained constant during the melting process when doing the experiment of "exploring the melting law of the substance". At this time, the temperature indication is shown in the figure, so the melting point of the substance is℃. If the material is allowed to solidify, the following image can correctly reflect the solidification process of the material.

22. (Zhuzhou, 20 12). Fig. 9 is an image of temperature change with time when the state of a substance changes. As can be seen from the figure, the image is the temperature change curve when filling "melting" or "solidification", and the melting point of the substance is℃.

23. According to the regulations of the State Council, the temperature of office air conditioning should be set not lower than (optional 20℃ or 26℃) in summer. In winter, holding the bottom of the thermometer by hand to measure the temperature may make the measurement result biased (choose "high", "low" or "no influence"). The following table lists the melting points and boiling points of several common substances. When measuring the temperature of boiling water in Enshi, you can choose (choose "alcohol" or "mercury") thermometer.

temperature

Melting point of matter

/℃

/℃

Mercury column -38.8 357

Alcohol-1 17 78.5

Water 0 100

Three experimental questions (4 points for 24 questions, 4 points for 25 questions, 4 points for 26 questions, 6 points for 27 questions, *** 18 points)

24 .. How is the "white gas" from the popsicle formed? Does "white gas" float upward or downward? Why?

25.(20 12 Dongying). (4 points) The experimental device used by Xiao Ming to explore "the boiling of water" is shown in Figure A..

(1) If the thermometer reading at a certain moment is as shown in Figure B, then the thermometer reading at this moment is℃.

(2) According to the experimental data, Xiao Ming draws the relationship curve between temperature and time when water boils (as shown in Figure C). According to Figure C, the boiling point of water is Celsius.

(3) Xiao Ming saw that it took 10min from the time the water temperature reached 90℃ to the time the water boiled. Please give Xiaoming a reasonable suggestion in order to save class time.

26.(20 12 Xianning). (5 points) Xiao Ming uses the device shown in figure 15A to heat the ice cubes.

(1) According to the experimental records, he drew an image of the temperature changing with time when the ice melted, as shown in figure 15B. According to the image, ice is _ _ _ _ (fill in "crystal" or "amorphous"); At the end of 10min, the substance in the cup is in _ _ _ (fill in "solid", "liquid" or "solid-liquid mixed state");

(2) Continue to heat until the water boils. At this point, the pointer of the thermometer is as shown in Figure15 C and remains unchanged. Then the boiling point of water is _ _℃, which means that the atmospheric pressure above the water surface at that time was a standard atmospheric pressure.

27. When Xiaohong did the experiment of "observing the boiling of water" in the laboratory (pictured), the experimental data recorded were as follows:

Time/Minute 0 1 2[ 3 4 5 6 7]

Temperature/℃

(1) Figure _ _ _ _ shows the situation when water is boiling. According to the analysis data, the boiling point of water is _ _ _ _ _ _. After the water boils, it will continue to be heated, and the water temperature is _ _ _ _ _ _ _ (select "Increase", "Constant" or "Decrease").

(2) Please draw the image of water temperature changing with time according to the recorded experimental data.

The second day of physics, the first volume, the third chapter, the answers to the questions:

Multiple choice problem

1a . 2b . 3b . 4c . 5b . 6c . 7c . 8b . 9b . 10c . 1 1b . 12B。

fill (up) a vacancy

13.48 years old. 14. Condense and absorb heat. 15. Evaporation absorbs heat, while thermal expansion contracts with cold. 16. Liquefaction and sublimation. 17. Liquefaction, vaporization and heat absorption. 18. Liquefaction, vaporization, heat release and heat absorption. 19. Sublimation. 20. sublimation. 2 1.48, C.22 solidification, 80.23.26℃, high, mercury.

three

24. Float down, because the "white gas" you see is a small water drop formed by the liquefaction of water vapor, which is heavier than air.

25.94,98, choose a small amount of warm water. 26. Crystal, solid-liquid mixed state, below 98.

27.( 1) A, 98, unchanged (2) omitted.