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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. Excess energy is released into the environment






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






3. Small uncharged particles in the nucleus they are neutral






4. It scatters light in many directions






5. 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 -






6. They are neither precise nor accurate.






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






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






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






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






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






12. Liter is the base unit of...






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






14. 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.






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






16. Nuclear fission - Nuclear Fusion






17. Measures the amount of matter in an object






18. An electric circut with a single path






19. The formula F=M/A is a shorthand force equals mass over acceleration. An object will not move unless the force is strong enough to move the mass.






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






21. The total entropy of a system plus that of its surroundings always increase.






22. 1/10 the base unit






23. Alkali metals






24. 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.






25. Is the work done divided by the amount of the time it took to do it. P= w/t






26. Potential & Kinetic






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






28. 100x the base unit






29. Pressure is measures in a unit called






30. The mechanical energy that a body has by virtue of its motion - energy of a moving object.






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






32. You see your reflection






33. The force of attraction between two objects. Gravity exists not only on earth - but also between planets as well as in black wholes






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






35. Shiny - softer & less dense. Mostly chemically active






36. 8 electrons






37. Where are protons an neutrons located?






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






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






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






41. An isotope has a different number of...






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






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






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






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






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






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






48. Carbon atom - atomic number 6 - atomic mass 11






49. Mass & weight are not the ____ quality






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