Answer the following question given this paragraph: atoms held together by covalent bonds; they tend to be very hard and have high melting points. Metallic solids have unusual properties: in addition to having high thermal and electrical conductivity and being malleable and ductile, they exhibit luster, a shiny surface that reflects light. An alloy is a mixture of metals that has bulk metallic properties different from those of its constituent elements. Alloys can be formed by substituting one metal atom for another of similar size in the lattice (substitutional alloys), by inserting smaller atoms into holes in the metal lattice (interstitial alloys), or by a combination of both. Although the elemental composition of most alloys can vary over wide ranges, certain metals combine in only fixed proportions to form intermetallic compounds with unique properties. Q: An alloy is a mixture of metals that has bulk metallic properties different from those of its what? Choices: - system elements - nuclear elements - mineral elements - constituent elements A:
constituent elements
(Question)
Answer the following question given this paragraph: One of the two generations of a plant's life cycle is typically dominant to the other generation. Whether it's the sporophyte or gametophyte generation, individuals in the dominant generation live longer and grow larger. They are the green, photosynthetic structures that you would recognize as a fern, tree, or other plant (see Figure below ). Individuals in the nondominant generation, in contrast, may be very small and rarely seen. They may live in or on the dominant plant. Q: Which generation of a plant is generally larger and longer-lived? Choices: - main generation - effective generation - alpha generation - dominant generation A:
(Answer)
dominant generation
Ques: Answer the following question given this paragraph: Kidney failure may be treated with dialysis. Q: Dialysis is a treatment for failure of what organs? Choices: - lungs - liver - spleen - kidneys A:
Ans: kidneys
(Q).
Answer the following question given this paragraph: Half-Life Why use a term like half-life rather than lifetime? The answer can be found by examining Figure 31.21, which shows how the number of radioactive nuclei in a sample decreases with time. The time in which half of the original number of nuclei decay is defined as the half-life, t 1 / 2 . Half of the remaining nuclei decay in the next half-life. Further, half of that amount decays in the following half-life. Therefore, the number of radioactive nuclei decreases from. Q: What term means the time in which half of the original number of radioactive nuclei in a sample decay? Choices: - reduced life - quarter-life - partial-life - half-life A:
(A).
half-life
Ques:Answer the following question given this paragraph: Superposition refers to the position of rock layers and their relative ages. Relative age means age in comparison with other rocks, either younger or older. The relative ages of rocks are important for understanding Earth's history. New rock layers are always deposited on top of existing rock layers. Therefore, deeper layers must be older than layers closer to the surface. This is the law of superposition . You can see an example in Figure below . Q: What is the position of rock layers and the relative ages called? Choices: - diffraction - metamorphism - bifurcation - superposition A:

Ans:superposition
Answer the following question given this paragraph: Most metalloids have some physical properties of metals and some physical properties of nonmetals. They fall between metals and nonmetals in their ability to conduct heat and electricity. They are shiny like metals but brittle like nonmetals. All exist as solids at room temperature. Q: What is an example of a metaloid element? Choices: - argon - chlorine - fluorine - silicon A:
silicon