General Science Knowledge Questions 1. Science Knowledge Test Questions
1. Is it difficult for astronauts to go to sleep in weightlessness? This is a question worth discussing because there are many reasons that affect sleep.
First, it is important to distinguish whether astronauts work in space on one or two shifts. On the ISS and most space shuttles, all astronauts sleep at the same time, and they hang their sleeping bags wherever they like to sleep, such as on the wall, in the corner, on the ceiling, and so on.
When astronauts worked in shifts, as on some shuttles including Spacelab, astronauts slept in a small bunk, which, when closed, insulated them from the noise coming from the studio. At first, astronauts have a somewhat uneasy feeling that they're lying in a cramped shoebox, and most have the illusion that their backs are comfortable for 10-15 seconds.
However, when you are going to sleep, you need to get used to the fact that you don't feel your back and sides, and that you are in fact floating in a sleeping bag, just hanging upside down from a rope, so the feeling of gravity that makes you drowsy is absent, and some astronauts don't get used to it yet. Some of the astronauts are not used to it. They are so sleepless and nervous that they have to take sleeping pills to fall asleep.
Others can sleep well even in this special environment. It should be added that if you sleep with your head in an unventilated area, the exhaled carbon dioxide collects near your nose, and when the carbon dioxide in your blood reaches a certain level, an alarm system at the back of your brain warns you and wakes you up, and you feel short of breath.
At that point, you take a few steps or change places, and you can fall asleep again. 2. Do astronauts feel anything special when they are dressed in space? Space suits for astronauts are usually no different from what we wear on Earth, except for special requirements for comfort and safety.
For example, the suit must be made of fireproof material. When wearing a space suit in weightlessness, the astronaut is effectively floating inside the suit, and only feels clothed when the suit touches the skin.
3. Is it fun to float in space? Astronauts agree that floating in space is fun once you've adapted to the microgravity environment. By the way, scientists don't like to refer to microgravity as zero gravity, because unless you're standing right in the center of a spacecraft in free-fall around the Earth, you're inevitably affected by tiny accelerations and tides, and even if they're as small as one-millionth of the Earth's gravitational pull, you can't think of it as no gravity or zero gravity.
This is why we call it weightlessness. Living in microgravity is interesting and feels different to different people.
About 30-40% of first-time astronauts experience "space adaptation syndrome" (which is a form of motion sickness) in the first two to three days in space, while others do not experience it. Blood flows to the upper body, congesting the sinuses and tongue and affecting one's senses, and within a week or so, the astronaut's body reacts by adapting to weightlessness.
In weightlessness, the spine lengthens due to the absence of gravity, making the person taller (1-2 inches taller). In weightlessness, when all the muscles are relaxed, there is a gentle lifting of the thighs upwards, the arms are stretched out in front, and the body is slightly arched as if in water.
Since there is no sense of "up" or "down" and you need to rely on other markers to determine "up" and "down", the space shuttle's interior has been designed to be a very comfortable place to be.
Since there is no sense of "up" or "down" and it is necessary to rely on other markers to determine "up" and "down", the interior of the Shuttle was designed with the difference between the ceiling and the floor in mind. In microgravity, astronauts often get the illusion.
When an astronaut tells his or her brain which direction is "up," it immediately assumes it is an illusion. As a result, orientation, transfer, or movement in space does not feel the same as on the ground.
Walking in space is very easy, and astronauts quickly become accustomed to walking around and anchoring themselves to the station with fixed feet. Walking in space in a space suit becomes much more difficult due to the large size of the overalls, which are like putting on a balloon, with limited vision and tactile senses.
4. How long can you wear a space suit? Generally you can wear it for 5-7 hours. Of course, it depends on the expendable materials in the suit, such as oxygen, electricity, cooling water, etc.
The suit can be worn for up to 5-7 hours.
Space suits are like small spaceships, and working in a space suit is hard work. The duration of wear is also related to the comfort and abrasion resistance requirements of the wearer.
5. What happens if I break a bone or get seriously ill in space? Fortunately, NASA's 120 astronauts in space have never encountered such a situation. In the early days, there were problems with Apollo 13 astronaut Fred's urinary infections and minor flu problems.
The spacecraft always had enough medicine on board to deal with these emergencies. In the event of an accident during flight around the Earth, whether on the shuttle or on the ISS, it is important to return the astronauts to Earth as quickly as possible.
NASA has also developed a large, seven-passenger return capsule for the ISS that is designed to be used as a "space ambulance" in special circumstances. In the event of a fracture, the spacecraft is also equipped to immobilize bones.
When human beings set off into outer space, such as in the expedition to Mars, the spacecraft will carry medical equipment, one or more astronauts are well trained in medical knowledge, they can rescue and treatment. Because in this case, returning to Earth in the short term is not possible.
When possible, the spacecraft will be equipped with experienced doctors. 6. How many people can the space station accommodate? The ISS can accommodate up to seven astronauts.
The number of astronauts increased from 3 to 6 at the beginning, and to 7 in 2003 (but now, due to problems with resources on the station, there are only 3 astronauts on board - translator). Of course, it is not possible to return all the crew immediately in an accident.
That's why NASA is improving the return capsule so that it can accommodate more people than the Russian Soyuz spacecraft. 7. How do astronauts on the space station spend their spare time in space? They each have their own favorites based on their different preferences.
In flight, they can each pick their favorite entertainment. Some can use their laptops to read or email their families, some are listening to music or playing games, and then some are just talking on the phone with their friends and family on the ground or chatting with other coworkers.
2. Science Quiz Questions
Do fish sleep during the day or at night?
A: In a scientific sense, sleep is the rest of the brain. Since fish do not have a brain, where they stop to rest is called sleeping.
65: Why do you see the lightning first and then hear the thunder when it strikes?
A: Because light travels much faster than sound.
66, perm can make hair curly forever? A: It can't.
67, Why does a helicopter have to have a small propeller at the back?
A: This is to prevent the fuselage from pirouetting and make the helicopter fly smoothly.
68, Why do you need nails in the trunk of an iron tree?
A: This is for the growth of the iron tree, nails it will grow better.
69. Why do bruised fingers turn blue?
A: Because some of the blood vessels in the bruised area are ruptured, and the blood that comes out seeps into the skin.
70. Why do people get carsick in cars?
A: The main reason for motion sickness out of the human ear, motion sickness and the body continuous rotation produced by the same bad feeling. Coupled with the fear of smelling gasoline and the odor of gas discharged will be carsick, so in the psychological effect of more prone to carsickness.
71. Why is the ice at the South Pole and the North Pole fresh water?
A: The crystallized substances are simple substances. When sea water is crystallizing, salt cannot be in it.
72. Why can't goldfish be kept in tap water?
A: Because chlorine is added to tap water. As long as the tap water is stored for one or two days, the chlorine content is reduced, it can be used to raise fish.
73. How is a mirage formed?
A: After the ground is heated, the density of the lower air is smaller than the density of the upper air, the light passes through the air layer of different densities, significant refraction occurs, and the distant scenery is displayed in the air or on the ground, giving people an illusion.
74, the wind is how to form? A: The wind is formed due to the flow of air.
75. Is there really water in the camel's hump?
A: There is no water. The camel is thirst-resistant because it has adapted to the environment in the desert.
76. Is ultraviolet light harmful to human eyes? A: Harmful.
77. Why do you urinate more on cold days?
A: Because the human body consumes more energy on cold days and produces more water, so there is more urine on cold days.
78, why does the fire always burn upwards? A: Because hot air rises.
79, the chicken first, or the egg first?
A: From the point of view of evolution, it should be the chicken first.
80, do you know where the eye drops into the eye go?
A: It flows deep into the nose and then into the mouth.
81, why watch TV for a long time eye fatigue?
A: Because the muscles inside the eyes are fatigued for a long time.
82, why is it necessary to do an allergy test before injecting penicillin?
A: This is to know in advance the penicillin-induced allergic antibodies, and re-entry into the body of penicillin combination, will bring much harm. Thus the danger is avoided.
83, the sunflower in the back of the shade also rotate with the sun? A: Yes.
84, why eat spicy things will sweat?
A: This is because of the body's conditioned reflex. This phenomenon is more pronounced in particularly sensitive people.
85, frostbite is how to cause?
A: This is because the walls of the blood vessels are damaged at low temperatures, oozing out the liquid inside, so it becomes red and swollen.
86, bamboo is a tree or grass?
A: Both trees and grass.
87: Do you know how long the life of an ant is?
A: The life span of worker ants is usually 1-2 years, of course, different species have different life span. The life span of a female ant king can live more than 10 years. In Australia, the female king of a white ant can live for more than 100 years.
88. Why do people's body temperatures rise when they eat food?
Answer: Two reasons: first, the temperature of the food itself will make the body temperature rise; in addition, the heat generated by the digestion of food will also make the body temperature rise.
89, mosquitoes in the dark why know someone?
A: With three kinds of feelings: one is human breathing; the second is the body temperature of people or animals; the third is the odor of people or animals.
90. What goes on in the head when you have a headache?
A: This is because the meninges on the outside of the skull are stretched or the blood flow to the brain is not good.
3. Primary school science science knowledge test questions
Hunan Province, Chaling County, west of the city elementary school science knowledge contest questions a. Fill in the blanks: 1, known as the "father of hybrid rice" scientists in China is (Yuan Longping).
2, artificial Earth satellites to get out of the Earth's attraction, into orbit, the speed must reach (11.2 km / s). 3, open the soda bottle, the inside will bubble, this is because of the dissolved (carbon dioxide) inside.
4, the marathon is a long-distance race, the whole for ( 42.195 ) kilometers. 5, 1 nanometer is equal to ( billionths of a meter ) meters.
6, China's self-developed space shuttle, named (Shenzhou), the first manned (Shenzhou 5) No. 7, Chinese scientists first reached the North Pole in (1951), in the Arctic to determine the site of the scientific research station is (1999) July 28, Yellow River Station, Yellow River Station is located in New Alsace.
8, the world's largest desert is the (African) continent's (Sahara) Great Desert. 9, in daily life, the voltage of the lighting circuit is (220) volts.
10, the smallest bone in the human body is (stapes) length of 0.25-0.43cm, only 50mg heavy (2-3mg?), located in the middle ear in the tympanic chamber ). 11, China's regulations, (12 weeks) children under the age of 12 years old are not allowed to ride bicycles on the road.
12, the largest marine life is (blue whale). 13, the Earth's crust in the most abundant metal element is (aluminum).
14, light rain is defined as within 24 hours, the amount of rainfall is less than (10) millimeters. 15, the Nobel Prize *** with (5 + 2) awards, Chinese-American Li Zhengdao won the (Nobel Prize in Physics).
16, China's "father of missiles" refers to (Qian Xuesen). 17, nature's hardest substance is (diamond).
18, the World Environment Day is (6) months (5). 19, the inventor of the electric light is (Edison).
20, tides are seawater by (sun) and (moon) the gravitational effect of the rising and falling movement, the daytime is called (tide), the night is called (tide). 21, the sound propagation speed in steel up to (5000) meters per second.
Second, choose: 1, the sinking and floating of sharks mainly rely on (b) a swim bladder b liver 2, the biological clock in the human body is located in the (d) a brain b cerebellum c hypothalamus d hypothalamus 3, the Earth's natural phenomena appearing the most is (a) a rain b earthquakes c volcano eruption d lightning 4, (a) can stand and sleep. a horse b cow c sheep d chicken 5, generally only (a) sex mosquitoes will bite people.
a female b male 6, the bee hive is composed of many (d) of the "small room". a triangle b quadrilateral c pentagonal d hexagonal 7, a thermometer placed in front of the rotating fan, the thermometer's column of liquid will be (c).
a rise b fall c unchanged 8, an ancient coin has a square hole in the middle, if the coin is put into the fire to heat, then the area of the hole will be (b). a shrink b expand c unchanged 9, the rabbit only sleeps (a) a day.
a 2 minutes b 2 hours c 4 hours d 6 hours 10, hydrogen balloon in the air will rise, in the process of rising, the volume of the hydrogen balloon gradually (a). a expand b shrink c unchanged 11, some items have two different names, such as "tar" and "asphalt" represents the same item. "asphalt" and "asphalt" mean the same thing.
So which two of the following names refer to the same item. a dry ice b methane c engine d solid carbon dioxide e motor f ethanol g methanol h alcohol i formalin j biogas (dry ice) and (solid carbon dioxide); (motor) and (engine); (methane) and (biogas); (ethanol) and (alcohol); (formalin) and (formaldehyde).
4. Science
1. There is a small basin floating in a big basin, and there are several stones in the small basin.
If this time in the small basin on a hole, let the small basin sink to the bottom of the water, this time the water level in the large basin will (B). A, down B, basically unchanged C, rise 2, in a transparent glass filled with some tap water, shake and make the water to produce air bubbles of different sizes.
Which rises faster, the big bubble or the small bubble? (B) A, the same fast B, big bubbles fast C, small bubbles fast 3, the corona is produced when we sometimes see three suns in the sky, this phenomenon is (B). A, refraction and reflection of light B, scattering of light C, dispersion of light (YES) the depth of the hair color as long as it is by the hair cells have their own pigmentation, as well as pigment cells function of the strength of the decision.
(no) We can smell the fresh scent of flowers because pollen molecules diffuse in the air to the nose, and diffusion can only occur in gases. (i don't know) Bees use the sun as a compass to determine the direction of their flight, while turtles and whales use the Earth's magnetic field to navigate.
5. Science Knowledge Contest Questions Answers + Answers
Compilation of Food Safety Science Knowledge 1. At present, what is the principle of food safety supervision and management in China? In accordance with the principle of supervision of a regulatory link by a department, to take sectional supervision as the main, varieties of supervision as a complementary way to further rationalize the function of food safety supervision, clear responsibility.
2, the local people at all levels *** What is the responsibility for food safety supervision? The State Council "on further strengthening food safety work of the decision", the requirements of "strengthening local *** on food safety supervision" responsibility. Local people at all levels *** of local food safety is responsible for, unified leadership, coordination of food safety supervision and rectification work in the region.
3, *** What are the responsibilities of the main food regulatory functions? Quality and technical supervision departments are responsible for food production and processing of the main functional departments of supervision; industry and commerce departments are responsible for the supervision of food circulation; health departments are responsible for the catering industry and canteens and other consumer supervision; food and drug supervision departments are responsible for the comprehensive supervision of food safety, organization and coordination, and according to the law, the organization of investigating and dealing with major accidents. 4, China's first batch of food safety credit system construction pilot industry is which? Meat, grain, children's food 3 industries.
5. What are the specific requirements of the state environmental conditions for the origin of pollution-free agricultural products? The environment meets the standard requirements of pollution-free agricultural production environment, the regional scope is clear, with a certain scale of production. 6, food quality and safety market access system is applicable to the main body? Food quality and safety market access system is applicable to the main body of the food quality and safety market access system is applicable to the main body of all engaged in the production and processing of food products in the domestic sales of citizens, legal persons or other organizations.
7, "QS" mainly includes which three elements? First, the implementation of food production license system for food production enterprises Second, the implementation of mandatory inspection system for food production enterprises Third, the implementation of food production licensing system for the implementation of quality and safety of food market access labeling system 8, in order to ensure product quality and safety, food production and processing enterprises on the raw and auxiliary materials, what are the requirements? Food production and processing of raw and auxiliary materials used must comply with the corresponding national standards, industry standards and relevant regulations, shall not use non-food raw materials for the production of food. Directly for food production and processing of water must meet the GB5749 "drinking water health standards" requirements.
9, the implementation of food production license management of vinegar products include? Brewing vinegar and prepared vinegar. Vinegar essence is not included in the scope of licensing.
10. What are the prohibited substances in the country? Animal and plant pathogens (including strains, poisonous species, etc.), pests and other harmful organisms, animal carcasses and soil. 11、What are the main contents of food labeling? Food name, ingredient list, net content and solids content, factory name, batch number, date mark and so on.
12, the limited use of the product must be labeled what? Should be clearly marked in a prominent position in the production date and safe use or expiration date 13, health food registration, approval by which department in charge? State Food and Drug Administration in charge of national health food registration and management, responsible for the approval of health food. 14, what are the circumstances, health food advertising approval number should be withdrawn? Approval of health food documents have been revoked; health food by the relevant state departments ordered to stop production, sales; advertising review failed.
15, major food safety incidents in the emergency plan for the accident is how to grade? Divided into particularly major food safety incidents (Level I), major food safety incidents (Level II) larger food safety incidents (Level III), general food safety incidents (Level IV). 16、How to recognize a major food safety incident (Grade III)? Meet one of the following circumstances, for the larger food safety incidents: (1) the scope of the accident involves the city (prefecture) level administrative area within the administrative area of more than two counties, to the people's dietary safety to bring a serious danger; (2) causing injury to more than 100 people, or the emergence of fatal cases; (3) the city (prefecture) level of the people *** determined that the more significant food safety incidents.
17, at present, the State General Administration of Quality Supervision, Inspection and Quarantine **** on how many categories of food to implement the "QS" market access system? 28 categories. Respectively, the old 5 categories: wheat flour, rice, edible vegetable oil, soy sauce, vinegar; new 10 categories: meat products, dairy products, beverages, condiments (sugar and monosodium glutamate), instant noodles, cookies, canned food, frozen drinks, puffed food, frozen rice and noodles; the new 13 categories: confectionery products, tea, wine, beer, wine, pickled vegetables, preserved vegetables, fried products, egg products, cocoa products, roasted coffee, aquatic products, starch and starch products. processed products, starch and starch products.
18, the World Health Organization (WHO) announced the world's top ten junk food is which? Fried food, pickled food, processed meat, cookies (excluding low-temperature baking and whole wheat cookies), soda and cola food, convenience food (mainly refers to instant noodles and puffed food), canned food (including fish and meat and fruits), preserved plums and candied fruit, frozen desserts, barbecue food. 19. What is the main problem of chemical contamination in poor quality children's food? The abuse of food additives is the main problem of chemical contamination in poor quality children's food.
20, "three no" food is what? No factory name and address, no factory certificate, no shelf life of the food. 21, what are the eating habits that hinder the development of adolescents? Not regular quantitative eating, partiality, eat high sugar, high salt, high fat food, obsessed with fast food, indiscriminate use of tonic drugs.
22, affecting the safety of food pollution of heavy metals are mainly? The main lead, mercury, cadmium. 23, in the Chinese domestic market sales of imported food, must use which of the following text identification? Chinese.
24, the world recognized three major carcinogens in food is what? Mainly present in which? Benzo(a)pyrene, nitramine and aflatoxin are recognized in the world in the food can produce the three major carcinogens, which, benzopyrene contamination occurs mainly in smoked and baked foods, some foreign fast food such as French fries, pancakes, roast pork, fruit desserts on the brown crunchy fried food there is also a benzo(a)pyrene; nitramine is mainly from meat and its products to add nitrites and nitrates; aflatoxin is found in moldy corn. Aflatoxin is mostly found in moldy corn. 25. What are the "four big killers" in unsafe food? Hanging white, hydrogen peroxide, formaldehyde and sulfur.
26, the scientific method of drinking milk? Drinking bags of milk must be boiled before drinking; the best with buns, noodles.
6. A little bit of general knowledge about life and scientific knowledge of the question
1. In the cold Antarctic live _ gypsies _____, in the hot jungle live _____ venomous snakes ____, in the arid desert live ____ cactus ____, and in the ocean live ______ whales ___.
In short, different ____ geographies___ live different___ organisms ______ and animals live _______ in harmony with their environment.2. ___Water ______, _______ protein_, and __fat _______ are the main materials that make up the human body, and __saccharides ______ provide energy for life.
3. The conditions for seeds to germinate are __suitable temperature ______, __moisture _____ and _____ nutrients__. 4. Animals use two main self-defense techniques, __attack__ and __escape _____, to protect themselves.
5. Fungi that can be eaten are ___mushrooms ____, ___mushrooms ____ and ________. 6. In our solar system, the closest planet to the sun is the ___moon ______ and the most massive planet is the ______ sun_.
7.China has established ___5 ____ marine nature reserves and ___4 ____ marine ecological environment specially protected areas to promote the effective protection of the type ____ sea ___ and ____ marine environment ____.