Answer the following question given this paragraph: Telescopes that use lenses to bend light are called refracting telescopes , or refractors ( Figure below ). The earliest telescopes were all refractors. Many amateur astronomers still use refractors today. Refractors are good for viewing details within our solar system. Craters on the surface of Earth's Moon or the rings around Saturn are two such details. Q: What are telescopes that use lenses to bend light called? Choices: - reflecting telescopes - sliding telescopes - layering telescopes - refracting telescopes A:
refracting telescopes
(Question)
Answer the following question given this paragraph: Q: How many electrons does lithium have? Choices: - four - seven - two - three A:
(Answer)
three
Ques: Answer the following question given this paragraph: Insulators In contrast to metals, electrical insulators are materials that conduct electricity poorly because their valence bands are full. The energy gap between the highest filled levels and the lowest empty levels is so large that the empty levels are inaccessible: thermal energy cannot excite an electron from a filled level to an empty one. The valence-band structure of diamond, for example, is shown in part (a) in . Because diamond has only 4 bonded neighbors rather than the 6 to 12 typical of metals, the carbon 2s and 2p orbitals combine to form two bands in the solid, with the one at lower energy representing bonding molecular orbitals and the one at higher energy representing antibonding molecular orbitals. Each band can accommodate four electrons per atom, so only the lower band is occupied. Because the energy gap between the filled band and the empty band is very large (530 kJ/mol), at normal temperatures thermal energy cannot excite electrons from the filled level into the empty band. Thus there is no pathway by which electrons can move through the solid, so diamond has one of the lowest electrical conductivities known. Figure 12.23 Energy-Band Diagrams for Diamond, Silicon, and Germanium. Q: In contrast to metals, electrical insulators are materials that conduct electricity poorly because their valence bands are what? Choices: - empty - large - half-full - full A:
Ans: full
(Q).
Answer the following question given this paragraph: Nervous tissue may become infected by microorganisms. Meningitis , for example, is caused by a viral or bacterial infection of the tissues covering the brain. This may cause the brain to swell and lead to brain damage and death. Q: Which organ of our body is harmed if you get meningitis? Choices: - spleen - lung - heart - brain A:
(A).
brain
Ques:Answer the following question given this paragraph: Mitosis occurs in four phases, called prophase, metaphase, anaphase, and telophase. Q: The four phases of mitosis are prophase, metaphase, anaphase and what? Choices: - spirogyra - postphase - trichina - telophase A:

Ans:telophase
Answer the following question given this paragraph: Adolescents may have mood swings because of surging hormones. Q: Many adolescents experience frequent mood swings. name one of the causes for this. Choices: - maturing nervous system - psychological changes - growing hormones - surging hormones A:
surging hormones