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






2. A unit of heat equal to the amount of heat required to raise the temperature of one kilogram of water by one degree at one atmosphere pressure. used by nutritionists to characterize the energy - producing potential in food






3. 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?






4. The total entropy of a system plus that of its surroundings always increase.






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






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






7. ______ of an atom is equal to the # of protons plus the # of protons plus the # of neutrons






8. The process of heat transfer via solid contact






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






10. The monovalent group - OH in such compounds as bases and some acids and alcohols. Makes the molecule polar which increases the solubility of a compound.






11. 1.) Protons 2.) Neutrons - They both have the same mass - but neutrons have no mass.






12. 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.






13. Mass & weight are not the ____ quality






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






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






16. The device (bell or Build) is an example of a load. A load is a device that uses energy.






17. Two or more simple machines working together EX. wheelbarrow it uses level - wheel & axle.






18. A material such as glass or porcelain with negligible electrical or thermal conductivity. Electric charges do not move easily - if at all.






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






20. Measure of the earth's pull






21. They are neither precise nor accurate.






22. Measures the amount of matter in an object






23. 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.






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






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






26. The more energy the electrons have






27. Reflects the light in one direction






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






29. 100x the base unit






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






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






32. Meter is the base unit of...






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






34. Pressure is measures in a unit called






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






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






37. Finding that a solution conducts an electric current shows conclusively that the solution...






38. Inclined plane - lever - wheel & axle - pulley.






39. 1000x the base unit






40. Excess energy is released into the environment






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






42. 2 or more substances combine to form a compound EX. A+B -> AB






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






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






45. Conduction - Convection - & Radiation






46. A free element replaces an element that is a part of a compound. Ex. A +BX -> AX + B






47. 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.






48. That for a fixed amount of gas at a constant temperature - the volume of a gas increases as its pressure decreases






49. (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.






50. Heat transferred by fluid current