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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. Lacking affinity for water. Repels water. Non - polar






2. Several vehicles - initially at a complete stop - begin a long race at the same starting point. The vehicle that has a constant value for which of the following is most likely to win?






3. The amount of energy that it takes to raise one gram of water one degree celsius.






4. The sum of the protons and neutrons






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






6. 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






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






8. Heat transferred by fluid current






9. Removal of static electricity by conduction






10. 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.






11. A piece of paper that appears blue in sunlight is illuminated solely by a red light that is passed through a green filter. What color does the paper appear under this illumination?






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






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






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






15. 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.






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






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






18. Consists of frequency (f) - measured in hertz - and wavelength measured in meters - the frequency times the wavelength of every electromagnetic wave equals the speed of light.






19. 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.






20. All processes cease when temperature approaches 0.






21. It scatters light in many directions






22. A heat that required to change (water from liquid to solid) from one state to another.






23. 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.






24. 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.






25. ______ of an atom is equal to the # of protons plus the # of protons plus the # of neutrons






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






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






28. Uses percent light absorbance to measure a color change - thus giving qualitative data using quantitative value - measures light intensity as a function of color - or more specifically - the wavelength of light.






29. Nuclear fission - Nuclear Fusion






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






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






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






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






34. It is the first element in group 13 - is a poor conductor of electricity at low temperature - however if temperature increases it will become a good conductor.






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






36. The amount of energy required for the liquid at its boiling point to become a gas






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






38. 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






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






40. 1. Have some characteristics of metals & non - metals. 2. Properties do not follow patterns like metals & non - metals.






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






42. 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






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






44. Solid has a definite shape and volume - Liquid has definite volume - but no shape - Gas has no shape of volume.






45. Potential & Kinetic






46. Is formed when 2 atoms share electrons - covalent bonding happens among non - metals.






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






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






49. 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.






50. 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.