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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. 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






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






3. The centripetal force is provided by the high banking of the curved road & by friction between the wheels & the road.






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






5. Is the measure of energy temperature is a measure of the heat in an object.






6. 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.






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






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






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






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






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






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






13. 1. Constructive 2. Destructive






14. 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






15. Static friction - Kinetic friction - Push & pull - rubbing - pull of gravity - forces on objects at rest - forces on a moving object - inertia & circular motion.






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






17. Mass & weight are not the ____ quality






18. Small uncharged particles in the nucleus they are neutral






19. The principle of conservation of energy: Energy can be transferred and transformed - but it cannot be created or destroyed.






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






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






22. 1/10 the base unit






23. Electrical - Light (radiant) - Heat (thermal) - Movement






24. (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.






25. Heat transferred by fluid current






26. Nuclear fission - Nuclear Fusion






27. 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






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






29. 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.






30. Energy is added to a system one of two things must happen either thermal energy must increase or work must be done.






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






32. They form only over warm oceans






33. The transfer of heat by electromagnetic waves is called?






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






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






36. Describes the force of friction of 2 surfaces that are in contact but do not have any motion relative to eachother.






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






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






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






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






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






42. Not as easy to recognize as metal bc they do not always share physical properties. They are dull - brittle - & not good conductors of heat






43. 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.






44. Resistance is measured in...






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






46. Symmetry - crystalline structures are universal - Crystallographic defects - Electrical properties - crystal system






47. 8 electrons






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






49. When force is applied to an object it moves in a straight line and adding force can make it go faster or slow down.






50. Negatively charged particles found outside the nucleus