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






2. 1000x the base unit






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






4. 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)






5. Alkaline earth metals






6. Meter is the base unit of...






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






8. A nuclear reaction in which a massive nucleus splits into smaller nuclei with the simultaneous release of energy






9. 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.






10. (physics and chemistry) the smallest component of an element having the chemical properties of the element






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






12. Measure of the earth's pull






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






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






15. The relationship between voltage - current - and resistance - V=IR






16. Inertia is the tendency of any object to resist change in motion. An object at rest tends to stay at rest. An object that is moving tends to keep moving.






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






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






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






20. Way of keeping tract of valence electrons






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






22. P1/T1=P2/T2. States that the pressure of a fixed amount of gas in a fixed volume is proportional to its temperature.

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23. Ratio of the density of a substance to the density of water






24. Is an atom that has all of its electrons in the lowest possible energy levels






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






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






27. Is the transfer of heat with no actual transfer of matter. Ex. Iron pan of flame.






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






29. Heat transferred by fluid current






30. The Earth's seasons can be attributed primarily to which of the following in conjunction with its revolution about the Sun?

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31. # of protons + # of neutrons






32. 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.






33. 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.






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






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






36. Metal - nonmetals - & metalliods






37. Current is measured with a device called...






38. Conduction - Convection - & Radiation






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






41. 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?






42. Potential & Kinetic






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






44. You see your reflection






45. 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.






46. 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.






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






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






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






50. A principle that states that for every action there is an equal reaction in the opposite direction

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