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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 sum of the protons and neutrons






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






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






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






5. Heat transferred by fluid current






6. The energy released by a nuclear reaction - binding energy is released when the nuclei of atoms are split apart in a nuclear reaction this binding energy is called nuclear energy.






7. What are the # of protons in the nucleus of an atom called?






8. Measure of the earth's pull






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






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






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






12. 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.






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






14. 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.






15. (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.






16. Current is measured with a device called...






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






18. Uses percent light absorbance to measure a color change - thus giving qualitative data using quantitative value - measures light intensity as a function of color - or more specifically - the wavelength of light.






19. The speed of light changes in different materials this is due to__






20. Alkali Metals are the most _____________






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






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






23. Is the study of the relationship between motion & the forces affecting motion.






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






25. Experiments may not be done on...






26. Objects are in thermal contact if they can affect each others temperature






27. You see your reflection






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






29. The process of heat transfer via solid contact






30. The molecular weight of a substance expressed in grams - measures the amount of a substance






31. 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)






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






33. 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






34. 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






35. 2 or more substances combine to form a compound EX. A+B -> AB






36. Is the change from liquid to gas.






37. The difference in electrical charge between two points in a circuit expressed in volt. When an electron goes through a load it does work & loses some energy.






38. It scatters light in many directions






39. Clustered regions of aligned magnetic atoms. When these regions are aligned with one another - the substance containing them is a magnet.






40. 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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41. Excess energy is released into the environment






42. 'An object at rest will remain at rest - and an object moving at a constant velocity will continue moving at a constant velocity - unless it is acted upon by an unbalanced force.' Another name is Law of Inertia






43. Consists of frequency (f) - measured in hertz - and wavelength measured in meters - the frequency times the wavelength of every electromagnetic wave equals the speed of light.






44. Negatively charged particles found outside the nucleus






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






46. 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.






47. 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.






48. 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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49. They form only over warm oceans






50. Describes the force of friction of 2 surfaces in contact with eachother . When there is relative motion between the surface.