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






2. 1. Make more coils - 2. put an iron cover (nail) inside the coils - use more battery power






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






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






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






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






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






8. Reflects the light in one direction






9. Alkaline earth metals






10. They are neither precise nor accurate.






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






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






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






14. Heat transferred by direct contact






15. # of protons + # of neutrons






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






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






18. The region around a magnet where the magnetic force is exerted






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






20. Current is measured with a device called...






21. The acceleration of an object depends on the mass of the object and the amount of force applied.






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






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






24. P1/T1=P2/T2. States that the pressure of a fixed amount of gas in a fixed volume is proportional to its temperature.

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






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






27. An object's _____ gives it resistance to change its current state of motion it is also the measure of an objects resistance to acceleration.






28. 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






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






30. 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.






31. ______ of an atom is equal to the # of protons plus the # of protons plus the # of neutrons






32. Removal of static electricity by conduction






33. Concave






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






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






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






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






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






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






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






41. 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.






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






43. Transfer of thermal energy with in a fluid. The particles in a fluid transfer the thermal energy from hot areas to cooler areas EX. the warmed up rising air from a heat source such as a fire or electric heater.






44. A free element replaces an element that is a part of a compound. Ex. A +BX -> AX + B






45. Excess energy is released into the environment






46. Polar molecules






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






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






49. 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.






50. Force of attraction that holds atoms together - when atoms are bonded chemically they give up their individual properties.






Can you answer 50 questions in 15 minutes?



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