Eighth grade comprehensive study examination questions

The first module

How much do you know about ancient and modern wars?

How many wars have happened in the world since ancient times? There are roughly the following statistics: in the recorded human history in 5560, there were 145 1 wars, with an average of 2.6 wars per year.

In the 234 years from 1740 to 1974, * * occurred 366 times, with an average of 136 times a year.

In the 37 years after World War II, including the ongoing * * * there were 87 times, with an average of 2.7 times a year.

During this period, there were 29 times in Asia, 26 times in Middle East and North Africa, 7 times in South Central Africa/KLOC-0, 0 times in Central and South America/KLOC-0, and 5 times in Europe.

global

Chinese Series

There were about 3,300 recorded wars in China from Xia Dynasty to Ming Dynasty, more than 400 in Qing Dynasty and hundreds in modern times.

There are about 4000-5000 wars in the history of our country, accounting for about one third of the total wars in the history of world wars.

1100000 people

70 million people

Number of recruits mobilized

22 million square kilometers

4 million square kilometers

Area of military operation zone

40

14

A country on whose territory military operations have been conducted.

35 million people

20 million people

Number of injured

32 million people

100000 people

The number of people killed in the war

654.38+07 billion people

65.438+0.5 billion people

Total number of participating countries

2 194 days

1564 days

period

six

17

Number of neutral countries

6 1

33

Number of participating countries

The Second World War

World War I

project

Comparative data of the two world wars.

An important battle in World War II.

I. The Battle of Pearl Harbor (194 1 year)

Two. Normandy landing (1944)

The second module

Modern local wars

War in Afghanistan

The war in Afghanistan refers to the war launched by the United States and the Northern Alliance of Afghanistan against the Taliban in 200 1 year. The result of the war has come out: the Taliban regime was overthrown and Al Qaeda was basically eliminated. _

20011/On September 65438, bin Laden's terrorist attack on the United States was the direct cause of this war. Al Qaeda is the largest and most cruel terrorist organization in the world, and it is also the deadly enemy of the United States. In the past few years, bin Laden has brought a lot of troubles to the United States. Bombing the American embassy and attacking destroyers are all his masterpieces. America did its best.

This is a relatively influential war at the beginning of the new century, and it is also a very strange war: the most powerful army in the world confronts the weakest armed forces, and the United States uses the most advanced weapons such as reconnaissance satellites, fighter jets, cruise missiles and laser-guided bombs. What does the Taliban have? Some shabby "weapons", he is proud of T-34 and rocket launcher. The disparity in strength can be seen. The result is obvious. This is also a war between good and evil. It is worth noting that the tactics used by the United States in this war have won the sympathy of most countries in the world and won unanimous support at home. The United States used warplanes to attack the ground, and the Northern Alliance sent special forces to assist in the operation, which reduced the most feared casualties of the US military and achieved good results.

The most powerful army—

United States armed forces

The weakest arm—

Taliban armed forces

Iraq war

On March 20, 2003, countries such as the United States and Britain bypassed the United Nations Security Council on the pretext that Iraq possessed weapons of mass destruction and secretly supported terrorism, and publicly and unilaterally decided to launch a large-scale military strike against Iraq. The real reasons are as follows:

First, an important step to promote global strategic expansion.

Second, based on geopolitical strategic considerations (establishing military bases and controlling the Middle East).

Third, promote American democracy and values (set up a sample list of "democracy" in the Middle East).

Fourth, control Middle East oil.

Xiang Zhuang's sword dance is intended to plot against Europe (challenge the euro and control the export of Middle East oil to Europe).

Sixth, George W. Bush wants to gain political capital and win the election.

Iraq War Casualty Statistics

According to the statistics of the US and British military and news media, since the outbreak of the Iraq war on March 20th, 330 allied soldiers have died, including 284 American soldiers, 45 British soldiers and soldiers from other countries 1 person. According to US estimates, the death toll of Iraqi troops is about 2,320, and the death toll of Iraqi civilians is between 6,087 and 7,798. (According to Xinhua News Agency)

We love peace, we don't like war, but in this world, the sound of guns, guns and explosions is far more than firecrackers and salutes. In the last 20th century, there were more than 400 wars in the world! In the two world wars, mankind paid a heavy price. In China, the gunfire of September 18th, the gunfire of July 7th Incident, and the cry of 300,000 compatriots killed in the Nanjing Massacre always remind us. Today in the 20th century, we love peace more, but war is not far away from us. When will the world turn swords into plowshares and live in peace forever? We are looking forward to this day! !

May the war be far away from us forever!

1. About the knowledge of force, the following statement is wrong ().

A. When the child pushes the wall, he is also pushed by the wall.

B, the football player headed the ball, and the direction of the ball changed, indicating that force can change the motion state of the object.

C, people sitting on the sofa, the sofa is concave, which shows that force can change the shape of objects.

D, only between objects in direct contact, the force can work.

2. Among the articles in the laboratory, the one weighing about 1N is ().

A, a dollar coin b, two eggs

C, three paper clips d, four experimental tables

3. The following statement about gravity is true ()

A, the plane flying in the air is no longer affected by gravity.

B, an acrobat walking a tightrope, holding a long pole in his hand is to make the performance more thrilling and beautiful.

C, the car driving on the slope, the gravity is perpendicular to the slope.

The main reason why the toy "tumbler" doesn't fall down is that its center of gravity is very low.

4, as shown in figure 1, belongs to the laborious lever is ().

5. Among the following statements, the correct one is ()

The pulley installed at the top of the school flagpole is a crown block.

B, the concave and convex pattern around the mineral water bottle cap is to reduce friction.

C, when the object is not stressed, the movement speed will be reduced and will eventually stop.

D after the astronauts arrive at the moon, their mass will become lighter.

6. People or things in the following sports, the fastest is ().

Liu Xiang set a world record for Sun in the men's 100 meter hurdles with a time of 12.88 seconds.

B, a classmate rides a bike for 2 minutes and 45 seconds, advanced1000 m.

C, walking tractor in 20 minutes forward 4.8 kilometers.

D, the speed limit of trucks in urban areas is 30km/h.

7. About inertia, the following statement is correct ().

First, a stationary object has inertia. B, uniform linear motion of the object has inertia.

C. inertia only exists when the direction of motion of an object changes. D. objects have inertia under any circumstances.

8. Regarding the pressures at points A, B and C in Figure 2, the correct statement is ().

The downward pressure of point A and point A is greater than the upward pressure of point B, and the pressures of point B, point A and point B are equal.

The pressures at points C and B are less than those at point C, and the pressures at points D, B and C are equal.

9. Put the bucket filled with pure water (about 40cm high) into the water with the opening facing down (Figure 3), and the result is ().

A, part of the water in the bucket will flow out; B. All the water in the bucket will flow out.

C, or a bucket full of water D, it is impossible to judge.

10. A wooden block weighing 10N floated in the water and finally floated on the water. What is buoyancy ()

A, floating less than 10n, floating more than 10N, floating more than 10N, floating less than 10N.

C floating point is equal to 10n, floating point is equal to 10N, floating point is greater than 10N and floating point is equal to 10N.

1 1. In the following cases, it cannot be explained that molecules have been doing random motion ().

A. After the perfume bottle is opened, the house is full of fragrance. Wet clothes are dry.

C, add some salt when cooking, and the dish will be salty. D, dust flying when sweeping the floor.

12. Of the following statements about molecules, the correct one is ().

A, molecules are small, but visible to the naked eye. B, diffusion phenomenon proves that molecules keep irregular movement.

C, the gas is easily compressed, indicating that the molecular force is great. D. Molecular force is molecular gravity.

13. The following particles and objects are arranged in the order from small to large, which is exactly ().

1. Nuclei, organisms, molecules, neutrons, the Earth, the solar system and the Milky Way.

B, protons, quarks, atoms, earth-moon system, the Milky Way, the whole galaxy and extragalactic galaxies.

Quarks, electrons, atoms, viruses, earth-moon system, the solar system and the Milky Way.

D, galaxy, galaxy, solar system, moon, people, molecules, nuclear.

14. The following is taken from a classmate's Physics Learning Notes, of which () is not completely correct.

A, "the standard atmospheric pressure is equal to the pressure generated by 760mm high mercury column, and the atmospheric pressure value is about 105Pa".

B, "g=9.8N/kg means1equal to 9.8N"

C, "the movement of molecules is related to temperature, the higher the temperature, the more intense the random movement of molecules"

D "The boiling points of all liquids increase with the increase of air pressure on the liquid surface and decrease with the decrease of air pressure"

15. Among the following groups of connection pairs, the completely correct one is ().

A, production means of transport and manufacturing principle B, physical quantities and units

Bulldozer installing crawler-increasing stress area and reducing pressure -P

Submarine principle-using "hollow method" speed-m/s

Aircraft can go up with high speed and low pressure.

C, physicists and their main contributions D, physical quantities and measuring tools

Thomson-discovery neutron dynamometer

Newton-Discovering the Law of Gravity-Atmospheric Pressure-Barometer

Ptolemy-Proposing "Heliocentrism"-Liquid Measuring Cylinder

See if it works. If not, forget it. Let me give you a reference. There are several physics problems. Although there is no answer, we can have a look.