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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. Solids - gasses - and 1 liquid (Bromine)






2. Conduction - Convection - & Radiation






3. Meter is the base unit of...






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






5. Group 17; contains nonmetals; 7 electrons in its outermost energy level; very reactive; poor conductors of electric current; never in its uncombined form in nature; combine with most metals to form salts






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






7. 100x the base unit






8. Which of the following parts of the Sun is easily visible only during a total solar eclipse






9. Alkaline earth metals






10. Most directly involved with controlling levels of sugar in blood






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






12. Decibels






13. The more energy the electrons have






14. Solutes that have bonds; no electrically charged species are created when they dissolve in water; glucose; lipids; urea






15. (physics) a process that alters the energy or structure or composition of atomic nuclei - When a reaction involves the nucleus - elements become different thus is called a nuclear reaction.






16. The molecular weight of a substance expressed in grams - measures the amount of a substance






17. Is the measure of energy temperature is a measure of the heat in an object.






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






19. A functional group consisting of a phosphorus atom covalently bonded to four oxygen atoms. Ideal for energy transfer reactions (ATP).






20. 1. Constructive 2. Destructive






21. Two or more simple machines working together EX. wheelbarrow it uses level - wheel & axle.






22. 2 or more substances combine to form a compound EX. A+B -> AB






23. An electric circut with a single path






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






25. 1. Liquid crystals - when certain solids melt their crystal lattices disintegrate & their particles lose their 3- dimensional pattern. 2. Solid - as a liquid substance cools & forms a solid. The strong attractive forces between oppositely charges ion






26. 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






27. Reflects the light in one direction






28. Force of attraction that holds atoms together - when atoms are bonded chemically they give up their individual properties.






29. Clustered regions of aligned magnetic atoms. When these regions are aligned with one another - the substance containing them is a magnet.






30. Polar molecules






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






32. Is the work done divided by the amount of the time it took to do it. P= w/t






33. They form only over warm oceans






34. Small uncharged particles in the nucleus they are neutral






35. The center of the atom.






36. Uses electrical charges of molecules to separate them according to their size the molecules such as DNA or proteins - are pulled through a gel towards either the positive end of the gel box.






37. A circut with two or more resistors where the electricity has more than one path to travel






38. The state of two or more objects or substances in thermal contact when they have reached a common temperature - EX. the affects after a hot cup of coffee meeting the desk temperature.






39. Discovered in the late 1800s that micro organisms play a casual role in onset of a disease






40. Average mass of various isotopes of the element.






41. Are used in the treatment of cancer b/c they can kill cancer cells. However - if powerful enough they can kill healthy cells.






42. Atoms with an equal # of protons and electrons.






43. Uses percent light absorbance to measure a color change - thus giving qualitative data using quantitative value - measures light intensity as a function of color - or more specifically - the wavelength of light.






44. The amount of energy required for the liquid at its boiling point to become a gas






45. Is a simple device used to indicate the existence of a positive or negative charge.






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






47. Compounds that speed up chemical reactions. Sometimes without Catalysts reactions cant occur.






48. A gelatinous sample of material from a previously unexplored marine environment is thought to be living or to be composed of recently living material. Which of the following would most clearly confirm that the material has a biological origin?






49. A compound of which a relatively small amount of the dissolved solute exists as ions in an aqueous solution. Example: Acetic acid - CH3COOH (vinegar)






50. 1/1000 the base unit







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Can you answer 50 questions in 15 minutes?


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