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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. 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.






2. Is the path along which electrons flow






3. Heat energy that is transferred into or out of a system






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






5. # of protons + # of neutrons






6. Alkaline earth metals






7. Metric unit for measuring temperature; On this scale water freezes at zero and boils at 100.






8. 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.






9. Series circut - Parallel circut






10. Metal - nonmetals - & metalliods






11. The agent most widely and most consistently at work changing the appearance of the Earth's surface






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






13. Liter is the base unit of...






14. Is the transfer of energy by waves such as the electromagnetic waves emitted by stars the sun warms the earth by emitting radiant energy.






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






16. 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.






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






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






19. Uses the principles of capillary action to separate substances such as plant pigments molecules of a larger size will migrate up the paper more quickly produce lines of pigment. - a process used for separating mixtures by virtue of differences in abs






20. 2 or more substances combine to form a compound EX. A+B -> AB






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






22. 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






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






24. Nuclear fission - Nuclear Fusion






25. 10x the base unit






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






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






28. Measures the amount of matter in an object






29. Alkali metals






30. 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.






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






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






33. 100x the base unit






34. Mass & weight are not the ____ quality






35. Change the chemical composition of a material - Computers can be made small enough to fit inside a plastic credit card - resistors are used to regulate volume on television or radio -






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






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






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






39. 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.






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






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






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






43. 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






44. 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.






45. Energy is added to a system one of two things must happen either thermal energy must increase or work must be done.






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






47. They form only over warm oceans






48. 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.






49. 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






50. Conduction - Convection - & Radiation