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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. Shiny - softer & less dense. Mostly chemically active






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






3. The monovalent group - OH in such compounds as bases and some acids and alcohols. Makes the molecule polar which increases the solubility of a compound.






4. 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






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






6. The process of heat transfer via solid contact






7. A nuclear reaction in which a massive nucleus splits into smaller nuclei with the simultaneous release of energy






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






9. Parts of 2 compounds replace each other. Ex. Switch partners AX + BY -> AY + BX






10. A wave in which the particles of the medium move perpendicularly to the direction the wave is traveling






11. Atoms of the same element that have different numbers of neutrons






12. 100x the base unit






13. 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






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






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






16. Heat transferred by fluid current






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






18. The centripetal force is provided by the high banking of the curved road & by friction between the wheels & the road.






19. 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.






20. 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.






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






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






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






24. Current is measured with a device called...






25. The agent most widely and most consistently at work changing the appearance of the Earth's surface






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






27. Alkali Metals are the most _____________






28. Heat transferred by direct contact






29. 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.






30. 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?






31. Alkali metals






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






33. The device (bell or Build) is an example of a load. A load is a device that uses energy.






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






35. Have properties in between metals and non - metals found in groups 13-16






36. The sum of the protons and neutrons






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






38. SI unit of temperature; indicates number of units above absolute zero. To go from Celsius to Kelvin add 273. To go from Kelvin to Celsius subtract 273.






39. 1. Constructive 2. Destructive






40. Electronic equipment that provides visual images of varying electrical quantities - Useful in studying waves b/c it gives a picture of the wave.






41. 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






42. 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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43. Lacking affinity for water. Repels water. Non - polar






44. Atoms of the same element that have different numbers of neutrons






45. 1000x the base unit






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






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






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






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






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

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