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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. An object's _____ gives it resistance to change its current state of motion it is also the measure of an objects resistance to acceleration.






2. The same pathogen must be found in every person with the same disease - the pathogen must be isolated & grown in a culture - when the organism is re - introduced in an experimental animal - that animal should develop the same disease originally seen


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






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


5. 'An object at rest will remain at rest - and an object moving at a constant velocity will continue moving at a constant velocity - unless it is acted upon by an unbalanced force.' Another name is Law of Inertia






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






7. A mixture containing two or more metallic elements or metallic and nonmetallic elements usually fused together or dissolving into each other when molten Ex. Brass is an alloy of zinc and copper






8. Are used in the treatment of cancer b/c they can kill cancer cells. However - if powerful enough they can kill healthy cells.






9. The process of heat transfer via solid contact






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






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






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






13. 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.






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






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






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






17. Way of keeping tract of valence electrons






18. 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.






19. Objects are in thermal contact if they can affect each others temperature






20. 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






21. 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.






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






23. The acceleration of an object depends on the mass of the object and the amount of force applied.






24. Are small positively charged particles






25. 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.






26. 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.






27. Is a simple device used to indicate the existence of a positive or negative charge.






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






29. 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)






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






32. It scatters light in many directions






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






34. 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.






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






36. (physics) a process that alters the energy or structure or composition of atomic nuclei - When a reaction involves the nucleus - elements become different thus is called a nuclear reaction.






37. A compound of which a relatively small amount of the dissolved solute exists as ions in an aqueous solution. Example: Acetic acid - CH3COOH (vinegar)






38. 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 -






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






40. Gram is the base unit of...






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






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






43. Concave






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






45. Meter is the base unit of...






46. Equal volumes of gases at the same temperature and pressure contain equal numbers of particles






47. Change from gas to liquid






48. Alkaline earth metals






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






50. The region around a magnet where the magnetic force is exerted