Q: Ion drives have low thrust but high what? Read this paragraph and choose the correct option from the provided answers: Ion drives have low thrust but high efficiency. They have already been used on several space missions, including NASA's Deep Space 1spacecraft and Japan'sHayabusa asteroid sampling probe. Source: Photo courtesy of NASA,http://commons. wikimedia. org/wiki/File:Ion_Engine_Test_Firing_-_GPN2000-000482. Choices: - power - acceleration - tolerance - efficiency A:
efficiency

Q: Surface tension is a property that can be found in what state of matter? Read this paragraph and choose the correct option from the provided answers: 12.2 Bernoulli's Equation 4. You can squirt water a considerably greater distance by placing your thumb over the end of a garden hose and then releasing, than by leaving it completely uncovered. Explain how this works. Water is shot nearly vertically upward in a decorative fountain and the stream is observed to broaden as it rises. Conversely, a stream of water falling straight down from a faucet narrows. Explain why, and discuss whether surface tension enhances or reduces the effect in each case. Look back to Figure 12.4. Answer the following two questions. Why is. Choices: - ice - vapor - water - liquid A:
liquid

Q: Q: What source of water pollution picks up chemicals from the ground with water and carries them to bodies of water? Read this paragraph and choose the correct option from the provided answers: Water pollution comes from many sources. One of the biggest sources is runoff. Runoff picks up chemicals such as fertilizer from agricultural fields, lawns, and golf courses. It carries the chemicals to bodies of water. The added nutrients from fertilizer often cause excessive growth of algae, creating algal blooms (see Figure below ). The algae use up oxygen in the water so that other aquatic organisms cannot survive. This has occurred over large areas of the ocean, creating dead zones , where low oxygen levels have killed all ocean life. A very large dead zone exists in the Gulf of Mexico. Measures that can help prevent these problems include cutting down on fertilizer use. Preserving wetlands also helps because wetlands filter runoff. Choices: - fertilizer - erosion - sediment - runoff A:
A: runoff

Question: Q: Metal detectors used for airport security work on which principle? Read this paragraph and choose the correct option from the provided answers: One common application of inductance is used in traffic lights that can tell when vehicles are waiting at the intersection. An electrical circuit with an inductor is placed in the road under the place a waiting car will stop over. The body of the car increases the inductance and the circuit changes sending a signal to the traffic lights to change colors. Similarly, metal detectors used for airport security employ the same technique. A coil or inductor in the metal detector frame acts as both a transmitter and a receiver. The pulsed signal in the transmitter coil induces a signal in the receiver. The self-inductance of the circuit is affected by any metal object in the path. Such detectors can be adjusted for sensitivity and also can indicate the approximate location of metal found on a person. (But they will not be able to detect any plastic explosive such as that found on the "underwear bomber. ") See Figure 23.43. Choices: - electricity - inertia - conductivity - inductance A:
Answer: inductance

*Question*
Q: The two members of a given pair of chromosomes are called what? Read this paragraph and choose the correct option from the provided answers: The two members of a given pair of chromosomes are called homologous chromosomes . We get one of each homologous pair, or 23 chromosomes, from our father. We get the other one of each pair, or 23 chromosomes, from our mother. A gamete must have the haploid number of chromosomes. That way, when two gametes unite, the zygote will have the diploid number. How are haploid cells produced? The answer is meiosis. Choices: - tissue chromosomes - divergant chromosomes - isolated chromosomes - homologous chromosomes A:
**Answer**
homologous chromosomes

Q: Topographic maps have a horizontal scale to indicate what distances? Read this paragraph and choose the correct option from the provided answers: Topographic maps have a horizontal scale to indicate horizontal distances. Choices: - diagonal - vertical - perpendicular - horizontal A:
horizontal