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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. Small uncharged particles in the nucleus they are neutral






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






3. 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.






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






5. The interference that occurs when two waves combine to make a wave with a larger amplitude






6. The amount of heat it takes to change a solid to a liquid






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






8. 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?






9. The same pathogen must be found in every person with the same disease - the pathogen must be isolated & grown in a culture - when the organism is re - introduced in an experimental animal - that animal should develop the same disease originally seen

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10. Concave






11. A temperature scale with the freezing point of water 32 degrees and the boiling point of 212 degrees.






12. Measures the amount of matter in an object






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






14. Gram is the base unit of...






15. 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.






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






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






18. The process of heat transfer via solid contact






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






20. 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)






21. Solids - gasses - and 1 liquid (Bromine)






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






23. Polar molecules






24. 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






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






26. An isotope has a different number of...






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






28. Is formed when 2 atoms share electrons - covalent bonding happens among non - metals.






29. Heat transferred by direct contact






30. 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.






31. 100x the base unit






32. Metric unit for measuring temperature; On this scale water freezes at zero and boils at 100.






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






34. 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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35. Alkali metals






36. Removal of static electricity by conduction






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






38. Several vehicles - initially at a complete stop - begin a long race at the same starting point. The vehicle that has a constant value for which of the following is most likely to win?






39. Uses sound waves to locate objects and is especially useful underwater the sound waves bounce off the object and are used to assist in location






40. Number of protons






41. Elements in the middle of the periodic table - in groups 3-12.






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






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






44. 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.






45. The property of sound that varies with variation in the frequency of vibration.






46. 1. nuclear reaction 2. radioactive






47. The mechanical energy that a body has by virtue of its position Ex. Stored energy -






48. The state of two or more objects or substances in thermal contact when they have reached a common temperature - EX. the affects after a hot cup of coffee meeting the desk temperature.






49. Atoms with an equal # of protons and electrons.






50. 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