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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. Resistance is measured in...






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






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






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






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






6. An electric circut with a single path






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






8. Polar molecules






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






10. 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






11. States that when 2 objects collide in an isolated system the total momentum of 2 objects after the collision. That is the momentum gained by object.






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






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

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






15. The Earth's seasons can be attributed primarily to which of the following in conjunction with its revolution about the Sun?

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16. 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






17. 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?






18. SI unit of temperature; indicates number of units above absolute zero. To go from Celsius to Kelvin add 273. To go from Kelvin to Celsius subtract 273.






19. 8 electrons






20. Is done on an object when an applied force moves across a distance.






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






22. Substance that dissociates completely into its ions when added to water and conducts electricity well.






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






24. Excess energy is released into the environment






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






26. It is the first element in group 13 - is a poor conductor of electricity at low temperature - however if temperature increases it will become a good conductor.






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. (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.






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






30. The more energy the electrons have






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






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






33. 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.






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






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






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






37. 100x the base unit






38. 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.






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






40. Change from gas to liquid






41. Record vibrations in earth & allow us to measure earthquake activity.






42. # of electrons. Non - metals have 4-8 electrons in their outermost energy.






43. Carbon atom - atomic number 6 - atomic mass 11






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






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






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






47. Measures the amount of matter in an object






48. Heat energy that is transferred into or out of a system






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






50. The theory that all matter is composed of particles (atoms and molecules) moving constantly in random directions