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






2. 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






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






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






5. Conduction - Convection - & Radiation






6. 2 or more substances combine to form a compound EX. A+B -> AB






7. Change from gas to liquid






8. 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.






9. 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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10. Relates pressure & temp. and temp and volume.






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






12. 100x the base unit






13. It scatters light in many directions






14. 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 -






15. Alkali metals






16. A functional group consisting of a phosphorus atom covalently bonded to four oxygen atoms. Ideal for energy transfer reactions (ATP).






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






18. Alkaline earth metals






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






20. An object's _____ gives it resistance to change its current state of motion it is also the measure of an objects resistance to acceleration.






21. 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.






22. Animals in which of the following groups may have a backbone and a spinal cord?






23. They are neither precise nor accurate.






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






25. Change in the apparent frequency of a wave as observer and source move toward or away from each other






26. Is the change from liquid to gas.






27. Concave






28. Nuclear fission - Nuclear Fusion






29. A Compound breaks down into 2 or more simpler substances EX. AB -> A+B






30. Describes the force of friction of 2 surfaces that are in contact but do not have any motion relative to eachother.






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

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






33. Experiments may not be done on...






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






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






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






37. The interference that occurs when two waves combine to make a wave with a smaller amplitude






38. A piece of paper that appears blue in sunlight is illuminated solely by a red light that is passed through a green filter. What color does the paper appear under this illumination?






39. Average mass of various isotopes of the element.






40. 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.






41. Where are protons an neutrons located?






42. (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.






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






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






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






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






47. When measuring the volume of water in a graduated cylinder where does one read the measurement?






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






49. 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






50. Potential & Kinetic