question stringlengths 14 399 | choices sequencelengths 4 4 | answer stringclasses 4
values | context stringlengths 732 6.9k |
|---|---|---|---|
What type of organism is commonly used in preparation of foods such as cheese and yogurt? | [
"protozoa",
"gymnosperms",
"mesophilic organisms",
"viruses"
] | C | Mesophiles grow best in moderate temperature, typically between 25°C and 40°C (77°F and 104°F). Mesophiles are often found living in or on the bodies of humans or other animals. The optimal growth temperature of many pathogenic mesophiles is 37°C (98°F), the normal human body temperature. Mesophilic organisms have impo... |
What phenomenon makes global winds blow northeast to southwest or the reverse in the northern hemisphere and northwest to southeast or the reverse in the southern hemisphere? | [
"coriolis effect",
"muon effect",
"centrifugal effect",
"tropical effect"
] | A | Without Coriolis Effect the global winds would blow north to south or south to north. But Coriolis makes them blow northeast to southwest or the reverse in the Northern Hemisphere. The winds blow northwest to southeast or the reverse in the southern hemisphere.
The trade winds blow westward in the tropics, and the west... |
Changes from a less-ordered state to a more-ordered state (such as a liquid to a solid) are always what? | [
"unbalanced",
"exothermic",
"reactive",
"endothermic"
] | B | Summary Changes of state are examples of phase changes, or phase transitions. All phase changes are accompanied by changes in the energy of a system. Changes from a more-ordered state to a less-ordered state (such as a liquid to a gas) areendothermic. Changes from a less-ordered state to a more-ordered state (such as a... |
What is the least dangerous radioactive decay? | [
"beta decay",
"gamma decay",
"alpha decay",
"zeta decay"
] | C | All radioactive decay is dangerous to living things, but alpha decay is the least dangerous.
The least stable is 15Ne with a half-life of 770(300) ys (7.7(3.0)×10−22 s). See isotopes of carbon for notes about the measurement. Light radioactive neon isotopes usually decay to fluorine or oxygen, while heavier ones decay ... |
Kilauea in hawaii is the world’s most continuously active volcano. very active volcanoes characteristically eject red-hot rocks and lava rather than this? | [
"greenhouse gases",
"carbon and smog",
"magma",
"smoke and ash"
] | D | Example 3.5 Calculating Projectile Motion: Hot Rock Projectile Kilauea in Hawaii is the world’s most continuously active volcano. Very active volcanoes characteristically eject red-hot rocks and lava rather than smoke and ash. Suppose a large rock is ejected from the volcano with a speed of 25.0 m/s and at an angle 35.... |
When a meteoroid reaches earth, what is the remaining object called? | [
"comet",
"meteorite",
"meteor",
"orbit"
] | B | Meteoroids are smaller than asteroids, ranging from the size of boulders to the size of sand grains. When meteoroids enter Earth’s atmosphere, they vaporize, creating a trail of glowing gas called a meteor. If any of the meteoroid reaches Earth, the remaining object is called a meteorite.
There are several videos of th... |
What kind of a reaction occurs when a substance reacts quickly with oxygen? | [
"invention reaction",
"combustion reaction",
"Fluid Reaction",
"nitrogen reaction"
] | B | A combustion reaction occurs when a substance reacts quickly with oxygen (O 2 ). For example, in the Figure below , charcoal is combining with oxygen. Combustion is commonly called burning, and the substance that burns is usually referred to as fuel. The products of a complete combustion reaction include carbon dioxide... |
Organisms categorized by what species descriptor demonstrate a version of allopatric speciation and have limited regions of overlap with one another, but where they overlap they interbreed successfully?. | [
"surface species",
"fitting species",
"species complex",
"ring species"
] | D | Ring species Ring species demonstrate a version of allopatric speciation. Imagine populations of the species A. Over the geographic range of A there exist a number of subpopulations. These subpopulations (A1 to A5) and (Aa to Ae) have limited regions of overlap with one another but where they overlap they interbreed su... |
Alpha emission is a type of what? | [
"radiation",
"radioactivity",
"heat",
"light"
] | B | One type of radioactivity is alpha emission. What is an alpha particle? What happens to an alpha particle after it is emitted from an unstable nucleus?.
H-alpha (Hα) is a deep-red visible spectral line of the hydrogen atom with a wavelength of 656.28 nm in air and 656.46 nm in vacuum. It is the first spectral line in t... |
What is the stored food in a seed called? | [
"pollin",
"endosperm",
"membrane",
"larval"
] | B | The stored food in a seed is called endosperm . It nourishes the embryo until it can start making food on its own.
The seeds are eaten by chipmunks, mice, and squirrels. Rabbits and voles eat the bark, sometimes girdling young trees. The leaves serve as food for caterpillars of various Lepidoptera (see Lepidoptera whic... |
Zinc is more easily oxidized than iron because zinc has a lower reduction potential. since zinc has a lower reduction potential, it is a more what? | [
"much metal",
"Trap metal",
"active metal",
"usually metal"
] | C | One way to keep iron from corroding is to keep it painted. The layer of paint prevents the water and oxygen necessary for rust formation from coming into contact with the iron. As long as the paint remains intact, the iron is protected from corrosion. Other strategies include alloying the iron with other metals. For ex... |
What is controlled by both genes and experiences in a given envionment? | [
"reflexes",
"animal behaviors",
"instincts",
"learned behaviors"
] | B | Most animal behaviors are controlled by both genes and experiences in a given environment.
Genes provide numerous options for varying cells to be expressed; however, the environment determines which of these are activated. Many studies have noted this relationship in varying ways in which our bodies can develop, but th... |
What tells you how much of the food you should eat to get the nutrients listed on the label? | [
"serving size",
"regular size",
"scoop size",
"longer size"
] | A | The information listed at the right of the label tells you what to look for. At the top of the label, look for the serving size. The serving size tells you how much of the food you should eat to get the nutrients listed on the label. A cup of food from the label pictured below is a serving. The calories in one serving ... |
What are used to write nuclear equations for radioactive decay? | [
"trigonometric symbols",
"critical symbols",
"radioactive symbols",
"nuclear symbols"
] | D | Nuclear symbols are used to write nuclear equations for radioactive decay. Let’s consider the example of the beta-minus decay of thorium-234 to protactinium-234. This reaction is represented by the equation:.
The kinetics of the reactor is described by the balance equations of neutrons and nuclei (fissile, fission prod... |
What is controlled by regulatory proteins that bind to regulatory elements on dna? | [
"amino acids",
"mRNA",
"gene transcription",
"substance transcription"
] | C | Gene transcription is controlled by regulatory proteins that bind to regulatory elements on DNA. The proteins usually either activate or repress transcription.
Regulatory elements are sites that control the transcription of a nearby gene. They are almost always sequences where transcription factors bind to DNA and thes... |
Boron only occurs naturally in compounds with what element? | [
"oxygen",
"helium",
"nitrogen",
"carbon"
] | A | Occurrence, Preparation, and Compounds of Boron and Silicon Boron constitutes less than 0.001% by weight of the earth’s crust. In nature, it only occurs in compounds with oxygen. Boron is widely distributed in volcanic regions as boric acid, B(OH)3, and in dry lake regions, including the desert areas of California, as ... |
What organ systems link exchange surfaces with cells throughout the body? | [
"vascular",
"circulatory",
"pulmonary",
"nervous"
] | B | 42.1 Circulatory systems link exchange surfaces with cells throughout the body.
Concentration differential between tissues. Exchange surface. Presence of natural barriers.
However, unlike somatic innervation, they quickly separate out through white rami connectors (so called from the shiny white sheaths of myelin aroun... |
What occurs when the immune system attacks a harmless substance that enters the body from the outside? | [
"panic attack",
"nausea",
"allergy",
"plague"
] | C | An allergy occurs when the immune system attacks a harmless substance that enters the body from the outside. A substance that causes an allergy is called an allergen. It is the immune system, not the allergen, that causes the symptoms of an allergy.
The organism enters directly through the breakdown of mechanical defen... |
Fertilization is the union of a sperm and egg, resulting in the formation of what? | [
"a cytoplasm",
"a zygote",
"a nuclei",
"a bacteriophage"
] | B | Fertilization is the union of a sperm and egg, resulting in the formation of a zygote.
Through an interplay of hormones that includes follicle stimulating hormone that stimulates folliculogenesis and oogenesis creates a mature egg cell, the female gamete. Fertilization is the event where the egg cell fuses with the mal... |
The plants alternation between haploid and diploud generations allow it to do what? | [
"reproduce asexually and simultaneously",
"reproduce asexually and sexually",
"reproduce sexually and autonomously",
"reproduce asexually and biologically"
] | B | All plants have a characteristic life cycle that includes alternation of generations . Plants alternate between haploid and diploid generations. Alternation of generations allows for both asexual and sexual reproduction. Asexual reproduction with spores produces haploid individuals called gametophytes . Sexual reproduc... |
Most of the chemical reactions in the body are facilitated by what? | [
"proteins",
"vitamins",
"carbohydrates",
"enzymes"
] | D | Enzymes are critical to the body’s healthy functioning. They assist, for example, with the breakdown of food and its conversion to energy. In fact, most of the chemical reactions in the body are facilitated by enzymes.
In biochemistry, a consecutive series of chemical reactions (where the product of one reaction is the... |
What is the termination of a pregnancy in progress called? | [
"contraception",
"miscarriage",
"delivery",
"abortion"
] | D |
Canady could not find this particular abortion practice named in any medical textbook, and therefore he and his aides named it. "Partial-birth abortion" was first used in the media on June 4, 1995, in a Washington Times article covering the bill. In the U.S., a federal statute defines "partial-birth abortion" as any a... |
Cutting down on the use of chemical fertilizers and preserving wetlands are ways to prevent what "unlivable" regions in bodies of water? | [
"inhabitable zones",
"hostile zones",
"fresh zones",
"dead zones"
] | D | Cutting down on the use of chemical fertilizers is one way to prevent dead zones in bodies of water. Preserving wetlands is also important. Wetlands are habitats such as swamps, marshes, and bogs where the ground is soggy or covered with water much of the year. Wetlands slow down and filter runoff before it reaches bod... |
Which muscles allow your fingers to also make precise movements for actions? | [
"paired muscles",
"motoric muscles",
"intrinsic muscles",
"fine movement muscles"
] | C | Intrinsic Muscles of the Hand The intrinsic muscles of the hand both originate and insert within it (Figure 11.28). These muscles allow your fingers to also make precise movements for actions, such as typing or writing. These muscles are divided into three groups. The thenar muscles are on the radial aspect of the palm... |
Testing what usually requires making observations or performing experiments? | [
"variables",
"hypothesis",
"conclusion",
"homeostasis"
] | B | Usually, testing a hypothesis requires making observations or performing experiments. In this case, we will look into existing scientific literature to see if either of these hypotheses can be disproved, or if one or both can be supported by the data.
Suitable tests of a hypothesis compare the expected values from the ... |
This sharing of electrons produces what is known as a covalent bond. covalent bonds are ~20 to 50 times stronger than what? | [
"Mendelian systems",
"Newton's third law",
"gravitational pull",
"van der waals interactions"
] | D | any other electron, they become a part of the molecule’s electron system.204 This sharing of electrons produces what is known as a covalent bond. Covalent bonds are ~20 to 50 times stronger than van der Waals interactions. What exactly does that mean? Basically, it takes 20 to 50 times more energy to break a covalent b... |
Water molecules move about continuously due to what type of energy? | [
"seismic",
"potential",
"kinetic",
"optical"
] | C | Water molecules move about continuously due to their kinetic energy. When a crystal of sodium chloride is placed into water, the water’s molecules collide with the crystal lattice. Recall that the crystal lattice is composed of alternating positive and negative ions. Water is attracted to the sodium chloride crystal be... |
A small scale version of what type of map displays individual rock units? | [
"seismic map",
"geographic map",
"geologic map",
"polar map"
] | C | Geologic maps display rock units and geologic features. A small scale map displays individual rock units while a large scale map shows geologic provinces.
One of the most important applications of the topographic profiles is in the construction of works of great length and small width, for example roads, sewers or pipe... |
What is defined as a change in the inherited traits of organisms over time? | [
"variation",
"evolution",
"divergence",
"generation"
] | B | One idea is that evolution happens. Evolution is a change in the inherited traits of organisms over time. Living things have changed as descendants diverged from common ancestors in the past.
When analyzing the types of changes that can occur to a phenotype, we can see changes that are behavioral, morphological, or phy... |
What hormone, which is associated with luteinizing hormone and male sexuality, helps bring about physical changes in puberty? | [
"steroids",
"epinephrine",
"testosterone",
"estrogen"
] | C | What causes puberty to begin? The hypothalamus in the brain “tells” the pituitary gland to secrete hormones that target the testes. The main pituitary hormone involved is luteinizing hormone (LH) . It stimulates the testes to secrete testosterone. Testosterone, in turn, promotes protein synthesis and growth. It brings ... |
Where do angiosperms produce seeds in flowers? | [
"ovaries",
"germs",
"cones",
"testes"
] | A | Seed plants called angiosperms produce seeds in the ovaries of flowers.
Angiosperms were formerly called Magnoliophyta ().Angiosperms are distinguished from the other seed-producing plants, the gymnosperms, by having flowers, xylem consisting of vessel elements instead of tracheids, endosperm within their seeds, and fr... |
In order to create food, what do photosynthetic protists use? | [
"thermal energy",
"hydrocarbons",
"decayed matter",
"light energy"
] | D | Photosynthetic protists use light energy to make food. They are major producers in aquatic ecosystems.
Most photosynthetic microbes are autotrophic, fixing carbon dioxide via the Calvin cycle. Some photosynthetic bacteria (e.g. Chloroflexus) are photoheterotrophs, meaning that they use organic carbon compounds as a car... |
What type of vertebrates are birds? | [
"epidermal tetrapod",
"invertebrates",
"endothermic tetrapod",
"exothermic"
] | C | Birds are endothermic tetrapod vertebrates. They are bipedal, which means they walk on two legs. Birds also lay amniotic eggs, and the eggs have hard, calcium carbonate shells. Although birds are the most recent class of vertebrates to evolve, they are now the most numerous vertebrates on Earth. Why have birds been so ... |
What type of ions do ionic compounds contain? | [
"regular and irregular",
"positive and charged",
"negative and neutal",
"positive and negative"
] | D | An ionic compound contains positive and negative ions.
An ionic liquid (IL) is a salt in the liquid state. In some contexts, the term has been restricted to salts whose melting point is below a specific temperature, such as 100 °C (212 °F). While ordinary liquids such as water and gasoline are predominantly made of ele... |
All living things need air and this to survive? | [
"stimuli",
"water",
"habitat",
"ecosystem"
] | B |
Oxygen is essential to all life. Plants and phytoplankton photosynthesize water and carbon dioxide and water, both oxides, in the presence of sunlight to form sugars with the release of oxygen. The sugars are then turned into such substances as cellulose and (with nitrogen and often sulfur) proteins and other essentia... |
The cells of all eukarya have a what? | [
"chloroplast",
"nucleus",
"epidermis",
"necrosis"
] | B | Some Eukarya are also single-celled, but many are multicellular. Some have a cell wall; others do not. However, the cells of all Eukarya have a nucleus and other organelles.
Eukaryotes have a nucleus where DNA is contained. They are usually larger than prokaryotes and contain many more organelles. The nucleus, the feat... |
What type of plate boundaries produce huge mountain ranges in the ocean basin? | [
"divergent",
"coherent",
"parallel",
"tractional"
] | A | Divergent plate boundaries produce huge mountain ranges under water in every ocean basin.
There are three main types of mountains: volcanic, fold, and block. All three types are formed from plate tectonics: when portions of the Earth's crust move, crumple, and dive. Compressional forces, isostatic uplift and intrusion ... |
Interstitial carbides are produced by the reaction of most transition metals at high temperatures with what element? | [
"hydrogen",
"oxygen",
"carbon",
"nitrogen"
] | C | temperatures with electropositive metals such as those of groups 1 and 2 and aluminum produces ionic carbides, which contain discrete metal cations and carbon anions. The identity of the anions depends on the size of the second element. For example, smaller elements such as beryllium and aluminum give methides such as ... |
Fungus-like protist saprobes play what role in a food chain and are specialized to absorb nutrients from nonliving organic matter, such as dead organisms or their wastes? | [
"aphids",
"Soil",
"fluxes",
"decomposers"
] | D | Agents of Decomposition The fungus-like protist saprobes are specialized to absorb nutrients from nonliving organic matter, such as dead organisms or their wastes. For instance, many types of oomycetes grow on dead animals or algae. Saprobic protists have the essential function of returning inorganic nutrients to the s... |
What are the sites of protein synthesis or assembly? | [
"chloroplasts",
"ribosomes",
"chromosomes",
"plasma"
] | B | Ribosomes are small organelles and are the sites of protein synthesis (or assembly). They are made of ribosomal protein and ribosomal RNA, and are found in both eukaryotic and prokaryotic cells. Unlike other organelles, ribosomes are not surrounded by a membrane. Each ribosome has two parts, a large and a small subunit... |
What must replicate in the cell cycle before meiosis i takes place? | [
"cell walls",
"dna",
"sperm",
"meiotic fluid"
] | B | Meiosis I begins after DNA replicates during interphase of the cell cycle. In both meiosis I and meiosis II , cells go through the same four phases as mitosis - prophase, metaphase, anaphase and telophase. However, there are important differences between meiosis I and mitosis. The eight stages of meiosis are summarized... |
What phenomenon is primarily the result of plate tectonic motions? | [
"earthquake",
"eruption",
"tsunamis",
"volcanoes"
] | A | Earthquakes are primarily the result of plate tectonic motions. What type of stress would cause earthquakes at each of the three types of plate boundaries?.
plate tectonics A geologic theory that the bending (folding) and breaking (faulting) of the solid surface of the Earth results from the slow movement of large sect... |
What is a group of neuron cell bodies in the periphery called? | [
"ganglion",
"crystals",
"organism",
"gangism"
] | A | Ganglia A ganglion is a group of neuron cell bodies in the periphery. Ganglia can be categorized, for the most part, as either sensory ganglia or autonomic ganglia, referring to their primary functions. The most common type of sensory ganglion is a dorsal (posterior) root ganglion. These ganglia are the cell bodies of ... |
Where does most of our food come from? | [
"angiosperms",
"microbes",
"lichen",
"gymnosperms"
] | A |
Approximately 70% of the freshwater used by humans goes to agriculture. Fishing in salt and fresh water bodies has been, and continues to be, a major source of food for many parts of the world, providing 6.5% of global protein. Much of the long-distance trade of commodities (such as oil, natural gas, and manufactured ... |
Gases are most ideal at high temperature and what pressure? | [
"low",
"absolute",
"high",
"stable"
] | A | Under what conditions then, do gases behave least ideally? When a gas is put under high pressure, its molecules are forced closer together as the empty space between the particles is diminished. A decrease in the empty space means that the assumption that the volume of the particles themselves is negligible is less val... |
Hard igneous rocks and easily dissolved sedimentary rocks respond very differently to what natural force? | [
"gravity",
"weathering",
"sunlight",
"evaporation"
] | B | Each type of rock weathers in its own way. Certain types of rock are very resistant to weathering. Igneous rocks tend to weather slowly because they are hard. Water cannot easily penetrate them. Granite is a very stable igneous rock. Other types of rock are easily weathered because they dissolve easily in weak acids. L... |
A diet rich in calcium and what vitamin may reduce the risk of osteoporosis and related bone fractures? | [
"niacin",
"vitamin d",
"vitamin A",
"vitamin C"
] | B | Skeletal system problems include osteoporosis, bone fractures, and ligament sprains. A diet rick in calcium and vitamin D may reduce the risk of osteoporosis and related bone fractures. Following safe practices may also reduce the risk of fractures as well as sprains.
In those who are otherwise healthy, there is little... |
How many people die from air pollution each year? | [
"22 million",
"14 million",
"17 million",
"5 million"
] | A | Air pollution is harmful to human beings and other living things. About 22 million people die from air pollution each year. Breathing polluted air increases the risk of developing lung diseases such as asthma and lung cancer. Breathing bad air also increases the chances of dying from other diseases. Children are most l... |
What substances serve as catalysts in most of the biochemical reactions that take place in organisms? | [
"hormones",
"enzymes",
"carbohydrates",
"iseotrops"
] | B | Enzymes are involved in most of the biochemical reactions that take place in organisms. About 4,000 such reactions are known to be catalyzed by enzymes, but the number may be even higher. Enzymes allow reactions to occur at the rate necessary for life.
In biology, enzymes are protein-based catalysts in metabolism and c... |
The formation of an amalgam allows the metal to react with what? | [
"air and water",
"helium and oxygen",
"cloth and plastic",
"blood and sweat"
] | A | The metals of group 13 (Al, Ga, In, and Tl) are all reactive. However, passivation occurs as a tough, hard, thin film of the metal oxide forms upon exposure to air. Disruption of this film may counter the passivation, allowing the metal to react. One way to disrupt the film is to expose the passivated metal to mercury.... |
A pulley changes the direction of the force t exerted by the cord without changing its what? | [
"magnitude",
"longitude",
"latitude",
"position"
] | A | automobile axle drives a wheel, which has a much larger diameter than the axle. The MA is less than 1. (c) An ordinary pulley is used to lift a heavy load. The pulley changes the direction of the force T exerted by the cord without changing its magnitude. Hence, this machine has an MA of 1.
In a funicular, both cars ar... |
What is the name of the small bumps that contain taste buds and covers the tongue? | [
"lingual tonsils",
"palatine tonsils",
"papillae",
"cuticle"
] | C | Figure 14.3 The Tongue The tongue is covered with small bumps, called papillae, which contain taste buds that are sensitive to chemicals in ingested food or drink. Different types of papillae are found in different regions of the tongue. The taste buds contain specialized gustatory receptor cells that respond to chemic... |
In the absence of air resistance, all falling objects accelerate at the same rate due to what force? | [
"gravity",
"velocity",
"weight",
"motion"
] | A | What if you were to drop a bowling ball and a soccer ball at the same time from the same distance above the ground? The bowling ball has greater mass than the basketball, so the pull of gravity on it is greater. Would it fall to the ground faster? No, the bowling ball and basketball would reach the ground at the same t... |
The ability for a plasma membrane to only allow certain molecules in or out of the cell is referred to as what? | [
"selective permeability",
"periodic permeability",
"total permeability",
"moderate permeability"
] | A | The plasma membrane forms a barrier between the cytoplasm inside the cell and the environment outside the cell. It protects and supports the cell and also controls everything that enters and leaves the cell. It allows only certain substances to pass through, while keeping others in or out. The ability to allow only cer... |
In the presence of oxygen, hydrogen can interact to make what? | [
"water",
"carbon",
"helium",
"acid"
] | A | A pile of leaves slowly rots in the backyard. In the presence of oxygen, hydrogen can interact to make water. Gold can be stretched into very thin wires.
The large amount of neutral hydrogen found in the damped Lyman-alpha systems is thought to dominate the cosmological baryonic density of the universe up to a redshift... |
What galaxy is our solar system a part of? | [
"Centaurus",
"Andromeda",
"Bode's Galaxy",
"milky way"
] | D | Compared to Earth, the solar system is a big place. But galaxies are bigger - a lot bigger. A galaxy is a very large group of stars held together by gravity. How enormous a galaxy is and how many stars it contains are impossible for us to really understand. A galaxy contains up to a few billion stars! Our solar system ... |
The angle at which light bends when it enters a different medium is known as what? | [
"bounce",
"refraction",
"frequency",
"resonance"
] | B | The angle at which light bends when it enters a different medium depends on its change in speed. The greater the change in speed, the greater the angle of refraction is. For example, light refracts more when it passes from air to diamond than it does when it passes from air to water. That’s because the speed of light i... |
Whether the organism is a bacterium, plant, or animal, all living things access energy by breaking down these? | [
"lipid molecules",
"protein molecules",
"carbohydrate molecules",
"oxygen molecules"
] | C | The Energy Cycle Whether the organism is a bacterium, plant, or animal, all living things access energy by breaking down carbohydrate molecules. But if plants make carbohydrate molecules, why would they need to break them down, especially when it has been shown that the gas organisms release as a “waste product” (CO2) ... |
Increasing the temperature of n2 molecules increases what energy of motion? | [
"kinetic energy",
"compression energy",
"residual energy",
"emotional energy"
] | A | Increasing the temperature increases the average kinetic energy of the N2molecules.
Even though these motions are called "internal", the external portions of molecules still move—rather like the jiggling of a stationary water balloon. This permits the two-way exchange of kinetic energy between internal motions and tran... |
Which radio frequency should you listen to if you want less noise? | [
"fm",
"am",
"wave",
"cb"
] | A | FM radio is inherently less subject to noise from stray radio sources than AM radio. The reason is that amplitudes of waves add. So an AM receiver would interpret noise added onto the amplitude of its carrier wave as part of the information. An FM receiver can be made to reject amplitudes other than that of the basic c... |
What form of radiation is the energy emitted by the sun? | [
"seismic",
"magnetic",
"thermal",
"electromagnetic"
] | D | Figure 8.11 The sun emits energy in the form of electromagnetic radiation. This radiation exists at different wavelengths, each of which has its own characteristic energy. All electromagnetic radiation, including visible light, is characterized by its wavelength.
Nuclear particles like protons and neutrons are not dest... |
What is the suns innermost layer called? | [
"core",
"surface",
"solar",
"flare"
] | A | The core is the Sun's innermost layer. The core is plasma. It has a temperature of around 15 million degrees Celsius (C). Nuclear fusion reactions create the immense temperature. In these reactions, hydrogen atoms fuse to form helium. This releases vast amounts of energy. The energy moves towards the outer layers of th... |
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