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






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






3. Describes the force of friction of 2 surfaces in contact with eachother . When there is relative motion between the surface.






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






5. The same pathogen must be found in every person with the same disease - the pathogen must be isolated & grown in a culture - when the organism is re - introduced in an experimental animal - that animal should develop the same disease originally seen

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6. 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.






7. Inertia is the tendency of any object to resist change in motion. An object at rest tends to stay at rest. An object that is moving tends to keep moving.






8. 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






9. Is the path along which electrons flow






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






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






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






13. Series circut - Parallel circut






14. They are neither precise nor accurate.






15. The theory that all matter is composed of particles (atoms and molecules) moving constantly in random directions






16. They form only over warm oceans






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






18. Temporary magnets that lose their magnetism when electric current is removed






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






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






21. Is done on an object when an applied force moves across a distance.






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






23. Heat transferred by fluid current






24. When measuring the volume of water in a graduated cylinder where does one read the measurement?






25. Measure of the earth's pull






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






27. Change from gas to liquid






28. Decibels






29. 1. Constructive 2. Destructive






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






31. 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






32. Number of protons






33. What are the # of protons in the nucleus of an atom called?






34. # of protons + # of neutrons






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






36. Is the transfer of energy by waves such as the electromagnetic waves emitted by stars the sun warms the earth by emitting radiant energy.






37. Uses the principles of capillary action to separate substances such as plant pigments molecules of a larger size will migrate up the paper more quickly produce lines of pigment. - a process used for separating mixtures by virtue of differences in abs






38. The force of attraction between two objects. Gravity exists not only on earth - but also between planets as well as in black wholes






39. A temperature scale with the freezing point of water 32 degrees and the boiling point of 212 degrees.






40. 1.) Protons 2.) Neutrons - They both have the same mass - but neutrons have no mass.






41. Are small positively charged particles






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






43. A nuclear reaction in which nuclei combine to form more massive nuclei with the simultaneous release of energy






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






45. Inclined plane - lever - wheel & axle - pulley.






46. Where are protons an neutrons located?






47. 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.






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






49. A principle that states that for every action there is an equal reaction in the opposite direction

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