(Close the book, time: 50 minutes)
Level 1: I will judge (20 points)
1 () When a ship sails from the Yangtze River into the sea, the draft of the ship will increase.
2. () A glue stick rubbed with fur and a glass stick rubbed with silk will attract each other when they are close.
3. () The sag of high-voltage wires is related to the weather. The lower the temperature, the more serious the wire sag.
4. () Starch, fat and protein are the energy sources of human body, and vitamins can promote growth and enhance the body's resistance.
5. () pumpkin flowers is divided into female flowers and male flowers, so it belongs to bisexual flowers.
6. () Seeds with hooks or thorns can be easily taken to other places by animals.
7, () the wrench is made by using the lever principle.
8. () The phenomenon of day and night is caused by the rotation of the earth.
9. () In the sunny Arctic, ice cubes can be used to make fire and dry wood.
10, () In the lever experiment, the closer the support point is to the weight, the greater the force used by the hand.
Level 2: I will choose (20 points)
1, the sun is so far away from us, but it will feel very hot in the sun. This heat transfer method is called ().
A, convection b, radiation c, conduction
2, the earth's rotation direction is ().
A, from east to west b, from west to east c, from south to north.
3, the following animals are generally viviparous ().
A, amphibians b, mammals c, birds
4, the biggest feature of the lunar terrain is composed of many different ().
A, mountain range B, surrounding mountain range C, sea area
5, wires and electrical parts should use plastic, because plastic ().
A, good insulation b, cheap c, easy to deform.
6, the following practices belong to increase friction is ().
A, rolling friction replaces sliding friction b, sliding friction replaces rolling friction c, and lubricating oil is added.
7. Dropping a drop of hydrochloric acid on a new section of rock can make bubbles, so this rock is ().
A. limestone b sandstone c granite
8, the movement of the following objects, belongs to the translation is ().
A. run the fan blade B. pull the drawer C. tighten the nut.
9. People use iron to make woks for cooking, because iron has a good ().
A. conductivity B. thermal conductivity C. ductility
10, the larger the magnification of the magnifying glass, the better the field of vision will be ().
A, the bigger B and the smaller C are the same size.
Level 3: I know everything (27 points)
1. The moon belongs to the earth, and it keeps going around the earth.
2. The middle part of the sun is covered by the moon, and there is a circle of sunlight around it.
3. The property that an object keeps its original static or moving state is called.
4. A silkworm's life goes through four stages: egg, _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.
5. The pulley at the top of the school flagpole belongs to the crane.
6. You can see the remains or remains of some ancient creatures in the rocks. These are called _ _ _ _ _ _ _.
7. Organisms are made of. The first person who discovered and put forward this name was an English scientist.
8. The most serious environmental problems in the world today include. The reason for the sea level rise is.
9. Animals whose bodies are divided into three parts are called insects.
10, the ability of an object to reflect sunlight is related to the sum of objects.
1 1. Rock is broken by water, atmosphere, temperature or the action of animals and plants. This phenomenon is called.
Band 4: Let me analyze (23 points)
1. Suppose two scientists want to know the efficacy of a drug for treating hypertension through experiments. The first scientist gave this drug to 1000 hypertensive patients and observed how many of them lowered their blood pressure. The second scientist asked 500 hypertensive patients to take this medicine, and the other 500 did not take it, and then compared how many people in each group lowered their blood pressure. In your opinion, which of these two methods is better? Why?
The fifth level: experimental inquiry (14)
1. Stick plasticine and plastic pen container together (plasticine is too heavy, the pen container will sink; If it is too light, it will float vertically in the water (in order to encapsulate a certain amount of air in the pen cap). Adjust the plasticine so that the top of the pen cap is just flush with the water. Find a mineral water bottle full of water, put the pen container in the bottle,
(1) Tighten the bottle cap, squeeze the bottle hard, and then the bottle cap will (), and when released, the bottle cap will ().
(2) Try to analyze the causes of this phenomenon.
2. The magnetic force of electromagnet is mainly related to the number of turns of the coil wound on the iron core and the current intensity in the coil. According to your experiment:
(1) Please write how you study the relationship between the magnetic force of electromagnet and the number of turns of the coil wound on the iron core. (4 points)
(2) When studying the relationship between the magnetic force of the electromagnet and the current intensity in the coil, Xiao Ming changed the current intensity in the coil while keeping the size of the iron core and the number of coils wound on the iron core unchanged, and obtained the following experimental data. (2 points)
Factors of change
The result of the test
first time
Use a new dry battery.
It can suck about 10 needles.
second time
Use two new dry batteries connected in series.
It can hold about 25 pins.
the third time
Use three new dry batteries in series.
It can suck about 40 needles.
What conclusion have you reached by analyzing the above data?
Attachment 1: Answer
Level 1: I will judge (***20 points, 2 points each).
× √ × √ × √ × × √ ×
Level 2: I will choose (***20 points, 2 points each).
Level 3: I know everything (***23 points, 65438+ 0 points per grid).
B B B B A B A B B B
1, satellite, Earth 2, annular eclipse 3, inertia 4, larva (silkworm), pupa, adult (moth) 5, crown block, pulley block 6, fossil 7, cell, Robert Hook 8, white pollution, air pollution, accelerated species extinction 9, ants (all insects), head, chest and abdomen 66.
Band 4: Let me analyze (***23, 1 question 5, 2 questions 6, 3 questions 6, 4 questions 6).
Question 1, 5 points, the second, (2 points) explanation: the second is to compare patients who take medicine and those who don't, so as to compare whether the medicine is effective. (3 points)
The fifth level: experimental inquiry (*** 14, 1 question 5, question 2 3, question 3 6).
Question 1, 5 points, (1) Sink (2) Float (1, 1) Reason (3 points) When we squeeze the bottle hard, the air in the pen cap is compressed, and part of the water enters the pen cap, resulting in a smaller volume of discharged water and a lower buoyancy, so
Question 2, 6 points, (1)4 points, 1, only change the number of turns of the coil wound on the iron core, other conditions remain unchanged.
2. The number of turns of the coil wound on the iron core for the first time is set to 30 turns. Connect the battery and see how many needles can be absorbed. Experiment 3 times. The number of turns of the coil wound on the iron core for the second time is set to 60 turns. Connect the battery and see how many needles can be absorbed. Experiment 3 times. Analyze the data and draw a conclusion.
(2) The stronger the current intensity, the greater the magnetic force of the electromagnet; The weaker the current intensity, the smaller the magnetic force of the electromagnet.