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Praxis General Science

Subjects : praxis, science
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Describes the force of friction of 2 surfaces in contact with eachother . When there is relative motion between the surface.






2. Harder - denser - have higher melting points & are chemically active.






3. The interference that occurs when two waves combine to make a wave with a smaller amplitude






4. The speed of light changes in different materials this is due to__






5. Small uncharged particles in the nucleus they are neutral






6. Average mass of various isotopes of the element.






7. Equal volumes of gases at the same temperature and pressure contain equal numbers of particles






8. The amount of energy that it takes to raise one gram of water one degree celsius.






9. Resistance is measured in...






10. An isotope has a different number of...






11. That for a fixed amount of gas at a constant temperature - the volume of a gas increases as its pressure decreases






12. The Earth's seasons can be attributed primarily to which of the following in conjunction with its revolution about the Sun?

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13. Liter is the base unit of...






14. Metric unit for measuring temperature; On this scale water freezes at zero and boils at 100.






15. The transfer of heat by electromagnetic waves is called?






16. # of electrons. Non - metals have 4-8 electrons in their outermost energy.






17. Finding that a solution conducts an electric current shows conclusively that the solution...






18. According to some scientists - the Earth's average surface temperature is rising as a result of the greenhouse effect. An increase in the atmospheric concentration of which of the following gases is considered to be primarily responsible






19. The energy released by a nuclear reaction - binding energy is released when the nuclei of atoms are split apart in a nuclear reaction this binding energy is called nuclear energy.






20. F - branch of chemistry that deals with the chemical action of electricity and the production of electricity by chemical reactions






21. Is an atom that has all of its electrons in the lowest possible energy levels






22. The volume of a gas is directly proportional to the temperature of a gas






23. Formed when one or more electrons are transferred from one atom to another. Transfer of electrons happens when metals & non - metals bond.






24. Removal of static electricity by conduction






25. Friction opposes the motion of one surface past another - Friction is common when slowing down a car or sledding down a hill.






26. ______ of an atom is equal to the # of protons plus the # of protons plus the # of neutrons






27. Shiny - softer & less dense. Mostly chemically active






28. Do not have molecules with one of the two molecular arrangements required to give an odor






29. Is the change from liquid to gas.






30. The region around a magnet where the magnetic force is exerted






31. Submarines - diving weighting system - naval architecture - Flotation - Buoyancy compensator






32. The amount of heat it takes to change a solid to a liquid






33. Solids - gasses - and 1 liquid (Bromine)






34. An electric circut with a single path






35. Heat absorbed or radiated during a change of phase at a constant temperature and pressure - the amount of heat required to undergo a phase change






36. The difference in electrical charge between two points in a circuit expressed in volt. When an electron goes through a load it does work & loses some energy.






37. What quantity of oxygen - O2 - contains very nearly the same number of molecules as 36.0 grams of water - H2O?






38. Are small positively charged particles






39. 1. Make more coils - 2. put an iron cover (nail) inside the coils - use more battery power






40. The center of the atom.






41. A heat that required to change (water from liquid to solid) from one state to another.






42. Heat energy that is transferred into or out of a system






43. Making and breaking of chemical bonds between atoms bonds involve only the outer electrons & do not effect the nucleus






44. Symmetry - crystalline structures are universal - Crystallographic defects - Electrical properties - crystal system






45. A material such as glass or porcelain with negligible electrical or thermal conductivity. Electric charges do not move easily - if at all.






46. Static friction - Kinetic friction - Push & pull - rubbing - pull of gravity - forces on objects at rest - forces on a moving object - inertia & circular motion.






47. The relationship between voltage - current - and resistance - V=IR






48. Rotate at very high speed in order to separate the liquids from the solids. The more dense part of the solution will sediment at the bottom of the test tube. while the lighter material will stay on top. Ex. centrifuge is used to separate blood from b






49. Lacking affinity for water. Repels water. Non - polar






50. 1. Like charges repel one another - 2. Opposite charges attract each other - 3. charge is considered a neutral object has no net charge.