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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. Change from gas to liquid






2. 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.






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


4. 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






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






6. Several vehicles - initially at a complete stop - begin a long race at the same starting point. The vehicle that has a constant value for which of the following is most likely to win?






7. Electrons in the outermost energy level; they are involved in bond formation






8. Negatively charged particles found outside the nucleus






9. Substance that dissociates completely into its ions when added to water and conducts electricity well.






10. 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.






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






12. Specific gravity is the ratio based on...






13. Is the path along which electrons flow






14. The principle of conservation of energy: Energy can be transferred and transformed - but it cannot be created or destroyed.






15. Used in electrical devices that have to function at temperatures too high for metals.






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






17. 1/10 the base unit






18. Pressure is measures in a unit called






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






20. As the velocity of a fluid increases - the pressure exerted by the fluid decreases - The speed of a fluid - liquid - gas - increases the pressure exerts.






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






22. Carbon atom - atomic number 6 - atomic mass 11






23. Experiments may not be done on...






24. Average mass of various isotopes of the element.






25. The ability of the material to oppose the flow of electrons through it all






26. All processes cease when temperature approaches 0.






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






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






29. 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


30. When force is applied to an object it moves in a straight line and adding force can make it go faster or slow down.






31. Small uncharged particles in the nucleus they are neutral






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






33. 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.






34. The object is further than one focal length from the lens






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






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






37. 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.






38. States that when 2 objects collide in an isolated system the total momentum of 2 objects after the collision. That is the momentum gained by object.






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






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






41. Resistance is measured in...






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






43. 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






44. Uses sound waves to locate objects and is especially useful underwater the sound waves bounce off the object and are used to assist in location






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






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






47. The amount of energy required to change a substance from the solid phase to the liquid phase at its melting point






48. Meter is the base unit of...






49. The acceleration of an object depends on the mass of the object and the amount of force applied.






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