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






2. 1. nuclear reaction 2. radioactive






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






4. Used in electrical devices that have to function at temperatures too high for metals.






5. As the velocity of a fluid increases - the pressure exerted by the fluid decreases - The speed of a fluid - liquid - gas - increases the pressure exerts.






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






7. (of a chemical reaction or compound) occurring or formed with absorption of heat. Absorbs energy from its surroundings.






8. All processes cease when temperature approaches 0.






9. Pressure is measures in a unit called






10. Heat transferred by fluid current






11. Meter is the base unit of...






12. 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.






13. Formed when one or more electrons are transferred from one atom to another. Transfer of electrons happens when metals & non - metals bond.






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


15. Causes motion






16. The center of the atom.






17. Resistance is measured in...






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






19. 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.






20. Compounds that speed up chemical reactions. Sometimes without Catalysts reactions cant occur.






21. Way of keeping tract of valence electrons






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






23. Measure of the earth's pull






24. 8 electrons






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






26. Uses the principles of capillary action to separate substances such as plant pigments molecules of a larger size will migrate up the paper more quickly produce lines of pigment. - a process used for separating mixtures by virtue of differences in abs






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






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






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






30. A unit of heat equal to the amount of heat required to raise the temperature of one kilogram of water by one degree at one atmosphere pressure. used by nutritionists to characterize the energy - producing potential in food






31. Lacking affinity for water. Repels water. Non - polar






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






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






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






35. Static friction - Kinetic friction - Push & pull - rubbing - pull of gravity - forces on objects at rest - forces on a moving object - inertia & circular motion.






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






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






38. They are neither precise nor accurate.






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






40. 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






41. Small uncharged particles in the nucleus they are neutral






42. 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






43. 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 -






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






45. Alkali metals






46. 1. Have some characteristics of metals & non - metals. 2. Properties do not follow patterns like metals & non - metals.






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






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






49. Not as easy to recognize as metal bc they do not always share physical properties. They are dull - brittle - & not good conductors of heat






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