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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. Do not have molecules with one of the two molecular arrangements required to give an odor






2. 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.






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






4. (physics) the capacity of a physical system to do work - or supply heat.






5. Relates pressure & temp. and temp and volume.






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






7. Small uncharged particles in the nucleus they are neutral






8. Electrons in the outermost energy level; they are involved in bond formation






9. Number of protons






10. 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.






11. You see your reflection






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






13. The amount of energy that it takes to raise one gram of water one degree celsius.






14. A heat that required to change (water from liquid to solid) from one state to another.






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






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






17. 1/10 the base unit






18. Negatively charged particles found outside the nucleus






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






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






21. Meter is the base unit of...






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






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






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






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. 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






27. Shiny - softer & less dense. Mostly chemically active






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






29. 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






30. Lacking affinity for water. Repels water. Non - polar






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






32. The sum of the protons and neutrons






33. Consists of frequency (f) - measured in hertz - and wavelength measured in meters - the frequency times the wavelength of every electromagnetic wave equals the speed of light.






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






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






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






37. A Compound breaks down into 2 or more simpler substances EX. AB -> A+B






38. Electronic equipment that provides visual images of varying electrical quantities - Useful in studying waves b/c it gives a picture of the wave.






39. Change in the apparent frequency of a wave as observer and source move toward or away from each other






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






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






42. Average mass of various isotopes of the element.






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






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






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






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






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






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






49. 1. Have some characteristics of metals & non - metals. 2. Properties do not follow patterns like metals & non - metals.






50. '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







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