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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. Non - metals - group 18 - the most non - reactive elements






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






3. A principle that states that for every action there is an equal reaction in the opposite direction

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






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






6. Excess energy is released into the environment






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






8. 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.






9. Reflects the light in one direction






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






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






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






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






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






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






16. '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






17. The sum of the protons and neutrons






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






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






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






21. Group 17; contains nonmetals; 7 electrons in its outermost energy level; very reactive; poor conductors of electric current; never in its uncombined form in nature; combine with most metals to form salts






22. 100x the base unit






23. Metal - nonmetals - & metalliods






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






25. (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.






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






27. The number of electrons per second that flow past a point in a circut.






28. 8 electrons






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






30. 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






31. When you step out of the shower the floor feels colder on your feet than the bathmat. Because heat is ______________ to the floor.






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






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






34. Is the change from liquid to gas.






35. 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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36. Are used in the treatment of cancer b/c they can kill cancer cells. However - if powerful enough they can kill healthy cells.






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






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






39. Stored mechanical - Nuclear - Chemical - gravitational






40. 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.






41. Change the chemical composition of a material - Computers can be made small enough to fit inside a plastic credit card - resistors are used to regulate volume on television or radio -






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






43. Conduction - Convection - & Radiation






44. Resistance is measured in...






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






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






47. The ability of the material to oppose the flow of electrons through it all






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






49. A carbon atom linked by a double bond to an oxygen atom. - c=o.






50. Gram is the base unit of...