Q: The zeros at the end of a number are known as what? Read this paragraph and choose the correct option from the provided answers: Trailing zeros, which are zeros at the end of a number, are significant only if the number has a decimal point. Thus, in 1,500, the two trailing zeros are not. Choices: - rest zeros - edge zeros - remaining zeros - trailing zeros A:
trailing zeros

Q: Planes fly in what layer of the atmosphere because there is less friction and turbulence? Read this paragraph and choose the correct option from the provided answers: Sure we can! If you've ever flown on a jet airplane, you've been in the stratosphere. Airplanes fly in the stratosphere, because there is less friction. They get better gas mileage and so costs are lower. There is also less turbulence, so passengers are happier. Can you identify the bottom of the stratosphere in the photo? It's where the clouds begin. Remember that all weather is in the troposphere. Choices: - mesosphere - ozone layer - crust - stratosphere A:
stratosphere

Q: Q: How long do the long-lived isotopes require to decay to a safe level in a nuclear reactor? Read this paragraph and choose the correct option from the provided answers: The energy produced by a reactor fueled with enriched uranium results from the fission of uranium as well as from the fission of plutonium produced as the reactor operates. As discussed previously, the plutonium forms from the combination of neutrons and the uranium in the fuel. In any nuclear reactor, only about 0.1% of the mass of the fuel is converted into energy. The other 99.9% remains in the fuel rods as fission products and unused fuel. All of the fission products absorb neutrons, and after a period of several months to a few years, depending on the reactor, the fission products must be removed by changing the fuel rods. Otherwise, the concentration of these fission products would increase and absorb more neutrons until the reactor could no longer operate. Spent fuel rods contain a variety of products, consisting of unstable nuclei ranging in atomic number from 25 to 60, some transuranium elements, including plutonium and americium, and unreacted uranium isotopes. The unstable nuclei and the transuranium isotopes give the spent fuel a dangerously high level of radioactivity. The long-lived isotopes require thousands of years to decay to a safe level. The ultimate fate of the nuclear reactor as a significant source of energy in the United States probably rests on whether or not a politically and scientifically satisfactory technique for processing and storing the components of spent fuel rods can be developed. Choices: - tens of years - millions of years - hundreds of years - thousands of years A:
A: thousands of years

Question: Q: What harmful light does ozone reduce in the upper atmospheres? Read this paragraph and choose the correct option from the provided answers: The ozone in smog is also harmful to human health. The image below shows the levels of ozone to watch out for ( Figure below ). Some people are especially sensitive to ozone. They can be harmed by levels of ozone that would not affect most other people. These people include those with lung or heart problems. Choices: - infrared light - visible light - specific light - ultraviolet light A:
Answer: ultraviolet light

*Question*
Q: When something is described as "hydrophilic", you can determine something about how it interacts with what? Read this paragraph and choose the correct option from the provided answers: hydrophilic heads are directed outward, in contact with the water. Each micelle may contain thousands of lipid molecules. Polar lipids may also form a monolayer, a layer one molecule thick on the surface of the water. The polar heads face into water, and the nonpolar tails stick up into the air. Bilayers are double layers of lipids arranged so that the hydrophobic tails are sandwiched between an inner surface and an outer surface consisting of hydrophilic heads. The hydrophilic heads are in contact with water on either side of the bilayer, whereas the tails, sequestered inside the bilayer, are prevented from having contact with the water. Bilayers like this make up every cell membrane (Figure 17.6 "Schematic Diagram of a Cell Membrane"). Figure 17.5 Spontaneously Formed Polar Lipid Structures in Water: Monolayer, Micelle, and Bilayer. Choices: - hydrogen - air - iron - water A:
**Answer**
water

Q: Glaciers modify the landscape by what? Read this paragraph and choose the correct option from the provided answers: Glaciers modify the landscape by erosion. They also modify the landscape by deposition. Glaciers carry an enormous amount of material and dump it. The features they leave behind show where they were and what happened as they were melting away. Choices: - silt - sediment - truncation - erosion A:
erosion