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






2. An electric circut with a single path






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






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






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






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






7. 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 -






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






9. They form only over warm oceans






10. Ratio of the density of a substance to the density of water






11. 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






12. (physics and chemistry) the smallest component of an element having the chemical properties of the element






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






14. Is the path along which electrons flow






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






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






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






18. 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






19. 1/1000 the base unit






20. 100x the base unit






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






22. 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?






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






24. Negatively charged particles found outside the nucleus






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






26. F - branch of chemistry that deals with the chemical action of electricity and the production of electricity by chemical reactions






27. Is the transfer of heat with no actual transfer of matter. Ex. Iron pan of flame.






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






29. Liter is the base unit of...






30. Discovered in the late 1800s that micro organisms play a casual role in onset of a disease






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






32. Gram is the base unit of...






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






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






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






36. Is the change from liquid to gas.






37. 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






38. 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.






39. 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.






40. 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.






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






42. The buoyant force on an object is equal to the weight of the fluid displaced by the object






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






44. Are small positively charged particles






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






46. Compounds that speed up chemical reactions. Sometimes without Catalysts reactions cant occur.






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






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






49. The difference in electrical charge between two points in a circuit expressed in volt. When an electron goes through a load it does work & loses some energy.






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