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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. 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






2. Clustered regions of aligned magnetic atoms. When these regions are aligned with one another - the substance containing them is a magnet.






3. 1/10 the base unit






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






5. It scatters light in many directions






6. The interference that occurs when two waves combine to make a wave with a smaller amplitude






7. Reflects the light in one direction






8. # of protons + # of neutrons






9. The interference that occurs when two waves combine to make a wave with a larger amplitude






10. A carbon atom linked by a double bond to an oxygen atom. - c=o.






11. 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)






12. Conduction - Convection - & Radiation






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






14. 1/1000 the base unit






15. Pressure is measures in a unit called






16. A boulder is sitting at the edge of the cliff it has which type of energy?






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






18. Number of protons






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






20. Electrical - Light (radiant) - Heat (thermal) - Movement






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






22. You see your reflection






23. Are small positively charged particles






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






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






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






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






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






29. 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.






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






31. 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.






32. 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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33. Elements in the middle of the periodic table - in groups 3-12.






34. 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.






35. Way of keeping tract of valence electrons






36. They are neither precise nor accurate.






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






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






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






40. The number of electrons per second that flow past a point in a circut.






41. Change from gas to liquid






42. Force of attraction that holds atoms together - when atoms are bonded chemically they give up their individual properties.






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






44. Describes the force of friction of 2 surfaces that are in contact but do not have any motion relative to eachother.






45. Relates pressure & temp. and temp and volume.






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






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






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






49. 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






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