Q: What device detects and measuresee earthquake waves? Read this paragraph and choose the correct option from the provided answers: Although the idea that Earth is a magnet is centuries old, the discovery of why Earth is a magnet is a relatively new. In the early 1900s, scientists started using seismographic data to learn about Earth's inner structure. A seismograph detects and measure earthquake waves. Evidence from earthquakes showed that Earth has a solid inner core and a liquid outer core (see the Figure below ). The outer core consists of molten metals, mainly iron and nickel. Scientists think that Earth's magnetic field is generated by the movement of charged particles through these molten metals in the outer core. The particles move as Earth spins on its axis. The video at the URL below takes a closer look at how this occurs. Choices: - stenograph - polygraph - sphygmomanometer - seismograph A:
seismograph

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Q: Where does most of the mass for an atom reside? Read this paragraph and choose the correct option from the provided answers: Electrons have virtually no mass, but protons and neutrons have a lot of mass for their size. As a result, the nucleus has virtually all the mass of an atom. Given its great mass and tiny size, the nucleus is very dense. If an object the size of a penny had the same density as the nucleus of an atom, its mass would be greater than 30 million tons! You can learn more about the size and mass of the nucleus at this URL:. Choices: - electrons - neutrons - protons - nucleus A:
(Answer)
nucleus

Ques: Q: Things that are hydrophobic repel or otherwise don't really mix with what? Read this paragraph and choose the correct option from the provided answers: Lignin is a tough carbohydrate molecule that is hydrophobic ("water fearing"). It adds support to vascular tissues in stems. It also waterproofs the tissues so they don't leak, which makes them more efficient at transporting fluids. Because most other organisms cannot break down lignin, it helps protect plants from herbivores and parasites. Choices: - air - magnets - heat - water A:
Ans: water

(Q).
Q: Insects are arthropods in which class? Read this paragraph and choose the correct option from the provided answers: Insects are arthropods in the class Hexapoda. They are the most numerous organisms in the world. Most are terrestrial, and many are aerial. Insects have six legs and a pair of antennae for sensing chemicals. They also have several eyes and specialized mouthparts for feeding. Insects are the only invertebrates that can fly. Flight is the main reason for their success. Insects may live in large colonies and have complex social behaviors. Insects spread disease and destroy crops. However, they are essential for pollinating flowering plants. Choices: - lexapoda - trichina - xerophyte - hexapoda A:
(A).
hexapoda

Ques:Q: What occurs when the cartilage at the ends of the bones breaks down? Read this paragraph and choose the correct option from the provided answers: Osteoarthritis occurs when the cartilage at the ends of the bones breaks down. The break down of the cartilage leads to pain and stiffness in the joint. Decreased movement of the joint because of the pain may lead to weakening of the muscles that normally move the joint, and the ligaments surrounding the joint may become loose. Osteoarthritis is the most common form of arthritis . It has many contributing factors, including aging, sport injuries, fractures, and obesity. Choices: - stress fracture - rheumatism - osteoporosis - osteoarthritis A:

Ans:osteoarthritis

Ques: Q: What layered form of carbon is used as a lubricant and in pencils? Read this paragraph and choose the correct option from the provided answers: Graphite is a form of carbon in which carbon atoms are arranged in layers. Bonds are strong between carbon atoms within each layer but relatively weak between atoms in different layers. The weak bonds between layers allow the layers to slide over one another. This makes graphite relatively soft and slippery. It is used as a lubricant. It also makes up the "lead" in pencils. Choices: - carbonite - copper - lead - graphite A:
Ans:
graphite