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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 object is further than one focal length from the lens






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






3. A nuclear reaction in which a massive nucleus splits into smaller nuclei with the simultaneous release of energy






4. Friction opposes the motion of one surface past another - Friction is common when slowing down a car or sledding down a hill.






5. Is the change from liquid to gas.






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






7. 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.






8. 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)






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






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






11. An electric circut with a single path






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






13. Measure of the earth's pull






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






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






16. Average mass of various isotopes of the element.






17. 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.






18. Are small positively charged particles






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






20. 1000x the base unit






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






22. '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






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






24. Solutes that have bonds; no electrically charged species are created when they dissolve in water; glucose; lipids; urea






25. 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






26. A wave in which the particles of the medium move perpendicularly to the direction the wave is traveling






27. The theory that all matter is composed of particles (atoms and molecules) moving constantly in random directions






28. A gelatinous sample of material from a previously unexplored marine environment is thought to be living or to be composed of recently living material. Which of the following would most clearly confirm that the material has a biological origin?






29. 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






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






31. Electrons that can accept energy from outside sources and move farther away from the nucleus






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






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






34. Decibels






35. 1. Like charges repel one another - 2. Opposite charges attract each other - 3. charge is considered a neutral object has no net charge.






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






37. Submarines - diving weighting system - naval architecture - Flotation - Buoyancy compensator






38. The amount of energy required for the liquid at its boiling point to become a gas






39. 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.






40. Nuclear fission - Nuclear Fusion






41. 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?






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






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






44. (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.






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






46. # of protons + # of neutrons






47. Have properties in between metals and non - metals found in groups 13-16






48. The sum of the protons and neutrons






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






50. Measures the amount of matter in an object