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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. Higher because it has higher apparent frequency.






2. Measure of the disorder or randomness of the particles that make of a system (measurement of movement of particles in a spontaneous reaction) EX. entropy increases as matter and energy in the universe degrade to an ultimate state of inert uniformity.






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






4. That for a fixed amount of gas at a constant temperature - the volume of a gas increases as its pressure decreases






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






6. 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.






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






8. 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.






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






10. Finding that a solution conducts an electric current shows conclusively that the solution...






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






12. 1. All are solids having the appearance of metals & non - metals. 2. All are white or gray - but not shiny 3. Conduct electricity - but not as well as metals.






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






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






15. Conduction - Convection - & Radiation






16. (physics) a process that alters the energy or structure or composition of atomic nuclei - When a reaction involves the nucleus - elements become different thus is called a nuclear reaction.






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






18. The object is further than one focal length from the lens






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






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






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






22. Excess energy is released into the environment






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






24. Used in electrical devices that have to function at temperatures too high for metals.






25. 'An object at rest will remain at rest - and an object moving at a constant velocity will continue moving at a constant velocity - unless it is acted upon by an unbalanced force.' Another name is Law of Inertia






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






27. Liter is the base unit of...






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






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






30. Measures the amount of matter in an object






31. The region around a magnet where the magnetic force is exerted






32. Stored mechanical - Nuclear - Chemical - gravitational






33. Relates pressure & temp. and temp and volume.






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






35. Removal of static electricity by conduction






36. The amount of heat it takes to change a solid to a liquid






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






38. Specific gravity is the ratio based on...






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






40. The acceleration of an object depends on the mass of the object and the amount of force applied.






41. The ability of the material to oppose the flow of electrons through it all






42. Harder - denser - have higher melting points & are chemically active.






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






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






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






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






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






48. Heat transferred by direct contact






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






50. 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.