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






2. Rotate at very high speed in order to separate the liquids from the solids. The more dense part of the solution will sediment at the bottom of the test tube. while the lighter material will stay on top. Ex. centrifuge is used to separate blood from b






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






4. Decibels






5. A free element replaces an element that is a part of a compound. Ex. A +BX -> AX + B






6. 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.






7. Which of the following parts of the Sun is easily visible only during a total solar eclipse






8. The buoyant force on an object is equal to the weight of the fluid displaced by the object






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






10. Concave






11. 8 electrons






12. Are small positively charged particles






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






14. Pressure is measures in a unit called






15. 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.






16. When you step out of the shower the floor feels colder on your feet than the bathmat. Because heat is ______________ to the floor.






17. Non - metals - group 18 - the most non - reactive elements






18. Metal - nonmetals - & metalliods






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






20. 1000x the base unit






21. 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.






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






23. Are used in the treatment of cancer b/c they can kill cancer cells. However - if powerful enough they can kill healthy cells.






24. 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)






25. A circut with two or more resistors where the electricity has more than one path to travel






26. Transfer of thermal energy with in a fluid. The particles in a fluid transfer the thermal energy from hot areas to cooler areas EX. the warmed up rising air from a heat source such as a fire or electric heater.






27. Causes motion






28. It scatters light in many directions






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






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






31. Removal of static electricity by conduction






32. Higher because it has higher apparent frequency.






33. 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






34. # of electrons. Non - metals have 4-8 electrons in their outermost energy.






35. Mass of the substance contained per unit of volume






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






37. Change in the apparent frequency of a wave as observer and source move toward or away from each other






38. The sum of the protons and neutrons






39. (physics) the capacity of a physical system to do work - or supply heat.






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






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






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






43. 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.






44. Nuclear fission - Nuclear Fusion






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






46. A gelatinous sample of material from a previously unexplored marine environment is thought to be living or to be composed of recently living material. Which of the following would most clearly confirm that the material has a biological origin?






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






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






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






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