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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 amount of energy required to change a substance from the solid phase to the liquid phase at its melting point






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






3. Average mass of various isotopes of the element.






4. The device (bell or Build) is an example of a load. A load is a device that uses energy.






5. Conduction - Convection - & Radiation






6. 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?






7. They form only over warm oceans






8. Have properties in between metals and non - metals found in groups 13-16






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






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






11. The theory that all matter is composed of particles (atoms and molecules) moving constantly in random directions






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






13. Describes the force of friction of 2 surfaces in contact with eachother . When there is relative motion between the surface.






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






15. Concave






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






17. A wave in which the particles move parallel to the path of the wave






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






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






20. 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






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






22. 1. Like charges repel one another - 2. Opposite charges attract each other - 3. charge is considered a neutral object has no net charge.






23. Uses electrical charges of molecules to separate them according to their size the molecules such as DNA or proteins - are pulled through a gel towards either the positive end of the gel box.






24. The more energy the electrons have






25. Change from gas to liquid






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






27. 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.






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






29. 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.






30. Where are protons an neutrons located?






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






32. 1. Constructive 2. Destructive






33. Solids - gasses - and 1 liquid (Bromine)






34. The monovalent group - OH in such compounds as bases and some acids and alcohols. Makes the molecule polar which increases the solubility of a compound.






35. You see your reflection






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






37. It is second element in group 14 - semi - conductor. Sand is made of silicon - it is also used to manufacture glass and cement.






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






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






40. 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.






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






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






43. Animals in which of the following groups may have a backbone and a spinal cord?






44. Heat transferred by fluid current






45. A Compound breaks down into 2 or more simpler substances EX. AB -> A+B






46. 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 -






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






48. 1. Liquid crystals - when certain solids melt their crystal lattices disintegrate & their particles lose their 3- dimensional pattern. 2. Solid - as a liquid substance cools & forms a solid. The strong attractive forces between oppositely charges ion






49. 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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50. Shiny - softer & less dense. Mostly chemically active