Answer the following question given this paragraph: Compared with the molecules of many other substances, molecules of water are strongly attracted to each other. How is this likely to affect the boiling point of water?. Q: Compared with the molecules of many other substances, molecules of water are strongly attracted to what? Choices: - hydrogen - helium - nothing - each other A:
each other
(Question)
Answer the following question given this paragraph: the history of galactic evolution has been, and the nature of space in their vicinity. However, so many black holes are now known that correlations between black hole mass and galactic nuclei characteristics are being studied. What is the mechanism for the energy output of quasars? These distant and extraordinarily energetic objects now seem to be early stages of galactic evolution with a supermassive black-hole-devouring material. Connections are now being made with galaxies having energetic cores, and there is evidence consistent with less consuming, supermassive black holes at the center of older galaxies. New instruments are allowing us to see deeper into our own galaxy for evidence of our own massive black hole. Q: What distant and extraordinarily energetic objects now seem to be early stages of galactic evolution with a supermassive black-hole-devouring material? Choices: - pulsars - stars - neutrinos - quasars A:
(Answer)
quasars
Ques: Answer the following question given this paragraph: Limnology is the study of the plants and animals that live in fresh water bodies. A lake has zones just like the ocean. The ecosystem of a lake is divided into three distinct zones ( Figure below ):. Q: What is the name for the study of the plants and animals that live in fresh water bodies ? Choices: - nematology - oceanography - hydrology - limnology A:
Ans: limnology
(Q).
Answer the following question given this paragraph: At 1600 C, quartz melts to yield a viscous liquid. When the liquid cools, it does not crystallize readily but usually supercools and forms a glass, also called silica. The SiO4 tetrahedra in glassy silica have a random arrangement characteristic of supercooled liquids, and the glass has some very useful properties. Silica is highly transparent to both visible and ultraviolet light. For this reason, it is important in the manufacture of lamps that give radiation rich in ultraviolet light and in certain optical instruments that operate with ultraviolet light. The coefficient of expansion of silica glass is very low; therefore, rapid temperature changes do not cause it to fracture. CorningWare and other ceramic cookware contain amorphous silica. Silicates are salts containing anions composed of silicon and oxygen. In nearly all silicates, sp3-hybridized silicon atoms occur at the centers of tetrahedra with oxygen at the corners. There is a variation in the silicon-to-oxygen ratio that occurs because silicon-oxygen tetrahedra may exist as discrete, independent units or may share oxygen atoms at corners in a variety of ways. In addition, the presence of a variety of cations gives rise to the large number of silicate minerals. Many ceramics are composed of silicates. By including small amounts of other compounds, it is possible to modify the physical properties of the silicate materials to produce ceramics with useful characteristics. Q: Many ceramics are composed of what, which are salts containing anions composed of silicon and oxygen? Choices: - vinylates - crystals - soils - silicates A:
(A).
silicates
Ques:Answer the following question given this paragraph: Q: What can damage animal tissues? Choices: - wind erosion - nervous stress - acid and water exposure - extreme pressure or temperature A:

Ans:extreme pressure or temperature
Ques:Answer the following question given this paragraph: An enzyme is a protein that acts as a biological catalyst. Recall that a catalyst is a substance that increases the rate of a chemical reaction without itself being consumed in the reaction. Cellular processes consist of many chemical reactions that must occur quickly in order for the cell to function properly. Enzymes catalyze most of the chemical reactions that occur in a cell. A substrate is the molecule or molecules on which the enzyme acts. In the urease catalyzed reaction above, urea is the substrate. The Figure below diagrams a typical enzymatic reaction. Q: What term is used to describe a protein that acts as a biological catalyst? Choices: - nucleus - protein - heterozygote - enzyme A:

Ans:
enzyme