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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. Way of keeping tract of valence electrons






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






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






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






5. Heat energy that is transferred into or out of a system






6. The relationship between voltage - current - and resistance - V=IR






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






8. The branch of physics that deals with static electricity - study of stationary electric charges.






9. The region around a magnet where the magnetic force is exerted






10. 1. Constructive 2. Destructive






11. 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






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






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






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






15. 1/10 the base unit






16. Alkali Metals are the most _____________






17. 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.






18. You see your reflection






19. Metal - nonmetals - & metalliods






20. Conduction - Convection - & Radiation






21. 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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22. Measure of the earth's pull






23. 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.






24. Is the path along which electrons flow






25. Discovered in the late 1800s that micro organisms play a casual role in onset of a disease






26. A boulder is sitting at the edge of the cliff it has which type of energy?






27. Are small positively charged particles






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






29. Gram is the base unit of...






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






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






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






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






34. Number of protons






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






36. 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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37. The agent most widely and most consistently at work changing the appearance of the Earth's surface






38. Is the change from liquid to gas.






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






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






42. It scatters light in many directions






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






44. 8 electrons






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






46. Mass of the substance contained per unit of volume






47. Is the measure of energy temperature is a measure of the heat in an object.






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






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






50. Equal volumes of gases at the same temperature and pressure contain equal numbers of particles