1, and the incident light forms an angle of 60 with the plane mirror, then the reflection angle is:

30-60 A.D.

2. Regarding the refraction of light, the following statement is correct:

A when light enters water from air, its propagation direction must be changed.

B when light enters the water from the air, the refracted light must be deflected to the water surface.

C. When light enters the air from water, its propagation direction may not necessarily change.

D when light enters the air from water, the refracted light must be deflected to the normal direction.

3, the following material state changes belong to sublimation is:

A. the water spilled on the ground will soon dry up. B. Formation of fog on the river surface

C.the water is slowly freezing. D. after the bulb is used for a period of time, the filament becomes thinner.

Xiao Ming wants to measure the current in L 1. The correct circuit diagram in figure 1 is:

5. Xiao Ming wrote "Knowledge Structure of Sound Phenomenon", among which the mistakes are:

Make a musical sound

A. The spread of sound phenomena B. The types of sound

Sound velocity noise

The sound weakens at the sound source.

C. The characteristic timbre of music D. The method of reducing noise is weakened in communication

The frequency of the human ear will decrease.

6. The following optical instruments without convex lenses are:

A. Camera B. Reflector C. Magnifier D. Slide projector

7, two lights in series, Yi Deng is brighter, Yi Deng is darker, the following statement is correct:

A. The brighter the lamp, the greater the current. B. darker lamps have higher current.

C. the current is the same. D. the condition is not enough to judge.

8. When Xiaoming moves an apple from the focal length of 1 times to the focal length of 4 times from the convex lens along the main optical axis, the image size of the apple is:

A. Constant B. Gradually decreasing C. First getting bigger and then getting smaller D. First getting smaller and then getting bigger.

9. The thermometer shown in Figure 2 shows-8℃;

10, when you find someone getting an electric shock, the following statement is correct:

A. immediately pull the person who gets an electric shock away. B. immediately cut the wire with a knife or scissors.

C. Pull the wire by hand immediately. D immediately cut off the power supply or pull away the wires with insulators.

1 1, and the lens optical path diagram in Figure 3 is correct:

12, Xiaoming opened the lid and boiled the eggs. After the water is boiled for the first time, continue to heat it with fast fire; After the water is boiled for the second time, turn down the flame, but still keep the water in the pot boiling. rule

A. It ripens quickly for the first time, because the water temperature is high at this time.

B. the second ripening is fast, because the water temperature is low at this time.

C. Cook it as soon as possible, because the temperature remains the same after the water is boiled.

D. it is impossible to compare, because it is impossible to know which time period the water temperature is high.

13, Xiaoming wants to dry the wet clothes as soon as possible. What is wrong in the following practices is:

A. hang wet clothes in the shade.

C, washing machine drying D, spreading the wet clothes and drying them in a ventilated place.

14, Xiaoyu judges whether there is current in the circuit according to whether the small light bulb in the circuit emits light. The physics research method adopted is:

A. control variable method B. analogy method C. transformation method D. model method

15, do you think there is no noise in the following situations:

A. At noon, when students are studying and resting in the classroom, some students play loudly.

B. In the middle of the night, someone sang loudly.

C. The teacher is lecturing in class, and some students are whispering.

D. In the opera house, the soprano sings loudly.

Book 2 (full score: 30)

First, knowledge and skills-light phenomenon (1 item 2, item 2, item 3 6, *** 10)

Xiao Ming thought when he saw the mirror hanging on the classroom wall:

1, when the light is reflected on the mirror, the reflection angle is _ _ _ _ _ incident angle.

2. The classroom blackboard is "reflective", which is caused by the blackboard being too smooth.

3. Objects can be imaged in a plane mirror. Xiao Ming said: "The distance from the image of an object in a plane mirror to the plane mirror is equal to the distance from the object to the plane mirror." Can you prove that the above statement is correct through experiments? Please briefly describe your experimental process.

Second, the integration of knowledge and skills-hot phenomenon (4 points for the fourth item, 6 points for the fifth item, *** 10)

In summer, Xiaoyu suddenly thought of the following questions when eating ice cream. Please help her answer these questions.

4. The state of matter from _ _ _ _ _ _ _ is called melting. The most common melting phenomenon is: _ _ _ _ _ _.

5. Figure 4 is the melting image of two substances, A and B. From the image, it can be seen that _ _ _ _ _ is a crystalline substance with a melting point of _ _ _ _ _. The melting process took _ _ _ _ _ _ time.

Figure 4

III. Integration of knowledge and skills-electrical phenomenon (item 6, 2 points, item 7, 1 point, item 8, 4 points, item 9, 2 points, * * 13 points).

Xiaolan thought of the following questions when she did an experiment to explore the current law of series-parallel circuits in the school laboratory. Please give her an answer.

6. In Figure 5, _ _ _ _ _ (fill in "A" or "B") is a parallel circuit.

7. Please mark the direction of current in the circuit with an arrow on the wire in Figure B. ..

8. Are street lamps connected in series or in parallel? Why?

A: The street lamps are connected. Because one of the lights is broken, the other lights.

9. Please connect the physical circuit in Figure 6 according to the circuit shown in Figure A. ..

10. If Xiaolan uses an ammeter to measure that the current in L 1 in Figure 5A is 0.3A, and Figure 7 shows the ammeter dial connected in series with L2, then the main current is _ _ _ _ _ _ A. ..

Fourth, reading inquiry (item 1 1, item 12, item 13, item 2, ***8)

Xiaoyan told her classmates that she would soak the crushed table tennis (but not broken) in hot water for a while, and the crushed place bulged again.

This aroused students' interest. Does the volume of air change with temperature?

So they did an experiment. A glass tube was inserted into the flask through a cork. The glass tube was filled with a small colored water column, as shown in Figure 8. Then he held the flask with his hand to heat the air in the flask and found that the small water column in the glass tube moved outward. After the hand left, the air temperature in the flask dropped and the small water column moved inward.

1 1. What conclusions can you draw from the above experimental phenomena?

12, Xiaoyan went out to play on a bicycle filled with oil in hot summer. On the way, I met my classmate Xiao Ming. She parked her bike in the hot sun and chatted with Xiao Ming. I was talking in high spirits when I heard a loud bang and the tire burst! What's going on here? Please explain it with the conclusion you just explored.

A: Under the scorching sun, when the air temperature and air volume in the tire reach a certain level, the tire will burst.

13, Xiaoyan and her classmates think in the process of inquiry.

Verb (abbreviation of verb) inquiry design (item 14 2, item 15 7, * * * 9).

14. When winter comes, Xiao Ming finds that most people wear dark clothes. Please ask an exploratory question according to this phenomenon.

15, Xiaoyu strolled by the sea after the snow and found that the water on the road was frozen, but the sea water was not. Does she think the freezing point of water is related to the salt content in water? So, she designed the following inquiry experiment process, please complete this experiment process with her.

Inquiry topic: What is the relationship between the freezing point of water and the salt content?

(1) Guess or assume:

(2) Design experiment:

Main equipment and devices: transparent refrigerator, three beakers, enough water, some salt and three thermometers.

Experimental steps:

(3) Experimental phenomena or data recording forms:

Six, problem solving (***9 points)

16, Xiaoming lives next to the expressway, with the window facing the expressway. Whenever a car passes by, it will make a lot of noise, which will seriously affect his rest and study. Please help Xiao Ming solve this problem according to what he has learned. Please explain the solution and the reason.

Seven, design and production (***6 points)

17. Xiaoming's father works in the Insect Museum. When observing a beautiful butterfly specimen, Xiao Ming found it inconvenient to observe only one side of the insect in one position. He thought: can you design a device that can observe several sides of a butterfly at the same time in one position? Please help Xiao Ming solve this problem. Please explain (or draw) the design scheme and reasons.

Eight, the relationship between physics and life and society (***5 points)

18 We all know that ultraviolet light is an invisible light outside the ultraviolet end of the spectrum. Ultraviolet rays have a very important relationship with people's lives.

Proper ultraviolet irradiation is helpful for human body to synthesize vitamin D, which is beneficial to human body's absorption of calcium, bone growth and many aspects of health. Ultraviolet rays can also kill microorganisms. In operating rooms and wards of hospitals, ultraviolet lamps are often used for disinfection. Ultraviolet rays can make fluorescent substances glow, and some positions of banknotes or trademarks are marked with fluorescent substances. Identifying these marks under ultraviolet light is an effective anti-counterfeiting measure.

Excessive ultraviolet radiation does great harm to human body, from rough skin to skin cancer.

Sunlight is the most important source of natural ultraviolet rays. If all the ultraviolet rays radiated by the sun reach the ground, plants, animals and humans on the earth can't survive.

After reading this article, do you think ultraviolet rays are always beneficial to people? Please give examples to illustrate what people should pay attention to when using ultraviolet rays.