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






2. 100x the base unit






3. 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






4. Stored mechanical - Nuclear - Chemical - gravitational






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






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






7. Pressure is measures in a unit called






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






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






10. Reduction in pressure of a fluid resulting from the speed increase as fluids are forced to flow faster through narrow spaces






11. 1/1000 the base unit






12. Electrons that can accept energy from outside sources and move farther away from the nucleus






13. Meter is the base unit of...






14. Metal - nonmetals - & metalliods






15. 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






16. Is the change from liquid to gas.






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






18. Record vibrations in earth & allow us to measure earthquake activity.






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






20. 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






21. 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.






22. 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)






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






24. What quantity of oxygen - O2 - contains very nearly the same number of molecules as 36.0 grams of water - H2O?






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






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






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






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






29. 10x the base unit






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






31. Number of protons






32. Resistance is measured in...






33. Nuclear fission - Nuclear Fusion






34. Organic molecules that are composed of only carbon and hydrogen.






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






36. All processes cease when temperature approaches 0.






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






38. Decibels






39. 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






40. Average mass of various isotopes of the element.






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






42. Ratio of the density of a substance to the density of water






43. An object's _____ gives it resistance to change its current state of motion it is also the measure of an objects resistance to acceleration.






44. Alkaline earth metals






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






46. 2 or more substances combine to form a compound EX. A+B -> AB






47. The formula F=M/A is a shorthand force equals mass over acceleration. An object will not move unless the force is strong enough to move the mass.






48. 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.






49. An electric circut with a single path






50. The center of the atom.