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






2. Liter is the base unit of...






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






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






5. The more energy the electrons have






6. 1/1000 the base unit






7. 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






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






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






10. Potential & Kinetic






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






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






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






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






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






16. Pressure is measures in a unit called






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






18. Alkaline earth metals






19. (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.






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






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






22. 1. Make more coils - 2. put an iron cover (nail) inside the coils - use more battery power






23. 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






24. Heat transferred by fluid current






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






26. The principle of conservation of energy: Energy can be transferred and transformed - but it cannot be created or destroyed.






27. Polar molecules






28. Force of attraction that holds atoms together - when atoms are bonded chemically they give up their individual properties.






29. 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.






30. 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.






31. 10x the base unit






32. Ratio of the density of a substance to the density of water






33. Negatively charged particles found outside the nucleus






34. The ability of the material to oppose the flow of electrons through it all






35. Meter is the base unit of...






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






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






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






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






40. 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.






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






42. Average mass of various isotopes of the element.






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






44. All processes cease when temperature approaches 0.






45. 1/10 the base unit






46. 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.






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






48. 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






49. A free element replaces an element that is a part of a compound. Ex. A +BX -> AX + B






50. 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.