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






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






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






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






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






7. All processes cease when temperature approaches 0.






8. 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.






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






10. (physics and chemistry) the smallest component of an element having the chemical properties of the element






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






12. # of protons + # of neutrons






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






14. Negatively charged particles found outside the nucleus






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






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






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






18. Is done on an object when an applied force moves across a distance.






19. 10x the base unit






20. ______ of an atom is equal to the # of protons plus the # of protons plus the # of neutrons






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






22. 1. nuclear reaction 2. radioactive






23. Do not have molecules with one of the two molecular arrangements required to give an odor






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






25. 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






26. Way of keeping tract of valence electrons






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






28. 8 electrons






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






30. 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.






31. The centripetal force is provided by the high banking of the curved road & by friction between the wheels & the road.






32. A circut with two or more resistors where the electricity has more than one path to travel






33. Rotate at very high speed in order to separate the liquids from the solids. The more dense part of the solution will sediment at the bottom of the test tube. while the lighter material will stay on top. Ex. centrifuge is used to separate blood from b






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






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






36. 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.






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






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






39. The process of heat transfer via solid contact






40. 1000x the base unit






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






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






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






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






45. 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.






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






47. 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.






48. # of electrons. Non - metals have 4-8 electrons in their outermost energy.






49. Alkali metals






50. Conduction - Convection - & Radiation