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






2. Small uncharged particles in the nucleus they are neutral






3. 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.






4. Decibels






5. 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.






6. 1000x the base unit






7. Way of keeping tract of valence electrons






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






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






10. 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






11. 1/10 the base unit






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






13. A buret is used to deliver solution in precisely - measured - variable volumes. deliver one reactant until the precise end point of the reaction is reached.






14. 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.






15. 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


16. 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






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






18. 1. nuclear reaction 2. radioactive






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






20. Series circut - Parallel circut






21. The sum of the protons and neutrons






22. Not as easy to recognize as metal bc they do not always share physical properties. They are dull - brittle - & not good conductors of heat






23. The total entropy of a system plus that of its surroundings always increase.






24. Is the study of the relationship between motion & the forces affecting motion.






25. A unit of heat equal to the amount of heat required to raise the temperature of one kilogram of water by one degree at one atmosphere pressure. used by nutritionists to characterize the energy - producing potential in food






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






27. The mechanical energy that a body has by virtue of its motion - energy of a moving object.






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






29. Animals in which of the following groups may have a backbone and a spinal cord?






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






31. The property of sound that varies with variation in the frequency of vibration.






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






33. Causes motion






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






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






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






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






38. The process of heat transfer via solid contact






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






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






41. 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.






42. Measure of the earth's pull






43. Reflects the light in one direction






44. A wave in which the particles move parallel to the path of the wave






45. 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.






46. Measures the amount of matter in an object






47. You see your reflection






48. Pushing a vacuum cleaner or pulling a bowstring applies muscular force when the muscles expand & contract elastic force occurs when an object returns to its original shape (for example - when a bow is released)






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






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