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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. Higher because it has higher apparent frequency.






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






3. Negatively charged particles found outside the nucleus






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






5. Number of protons






6. Most directly involved with controlling levels of sugar in blood






7. 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






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






9. A temperature scale with the freezing point of water 32 degrees and the boiling point of 212 degrees.






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






11. 8 electrons






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


13. 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.






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






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






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






17. # of protons + # of neutrons






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






19. All processes cease when temperature approaches 0.






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






21. 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






22. Non - metals - group 18 - the most non - reactive elements






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






24. 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.






25. 1000x the base unit






26. Uses the transfer of heat from one substance to another to determine the specific heat of the substance.






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






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






29. Heat absorbed or radiated during a change of phase at a constant temperature and pressure - the amount of heat required to undergo a phase change






30. Measure of the disorder or randomness of the particles that make of a system (measurement of movement of particles in a spontaneous reaction) EX. entropy increases as matter and energy in the universe degrade to an ultimate state of inert uniformity.






31. They are neither precise nor accurate.






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






33. Small uncharged particles in the nucleus they are neutral






34. Way of keeping tract of valence electrons






35. Temporary magnets that lose their magnetism when electric current is removed






36. 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)






37. Gram is the base unit of...






38. When force is applied to an object it moves in a straight line and adding force can make it go faster or slow down.






39. 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






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






41. The process of heat transfer via solid contact






42. 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.






43. Average mass of various isotopes of the element.






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






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






46. The transfer of heat by electromagnetic waves is called?






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






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






49. Series circut - Parallel circut






50. 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