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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. Metal - nonmetals - & metalliods






2. A nuclear reaction in which nuclei combine to form more massive nuclei with the simultaneous release of energy






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






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






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






6. 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.






7. 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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8. Current is measured with a device called...






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






10. The sum of the protons and neutrons






11. Specific gravity is the ratio based on...






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






13. 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






14. Alkali Metals are the most _____________






15. The process of heat transfer via solid contact






16. 1.) Protons 2.) Neutrons - They both have the same mass - but neutrons have no mass.






17. Atoms with an equal # of protons and electrons.






18. Electrons in the outermost energy level; they are involved in bond formation






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






20. Organic molecules that are composed of only carbon and hydrogen.






21. Measures the amount of matter in an object






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. Finding that a solution conducts an electric current shows conclusively that the solution...






24. 8 electrons






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






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






27. Substance that dissociates completely into its ions when added to water and conducts electricity well.






28. 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.






29. Gram is the base unit of...






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






31. Decibels






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






33. An electric circut with a single path






34. The amount of energy required for the liquid at its boiling point to become a gas






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






36. Making and breaking of chemical bonds between atoms bonds involve only the outer electrons & do not effect the nucleus






37. Resistance is measured in...






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






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






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






42. Number of protons






43. A functional group consisting of a sulfur atom bonded to a hydrogen atom (






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






45. Is the path along which electrons flow






46. Is formed when 2 atoms share electrons - covalent bonding happens among non - metals.






47. The mechanical energy that a body has by virtue of its position Ex. Stored energy -






48. Experiments may not be done on...






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






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