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Physical Science E4
E 4
| Question | Answer |
|---|---|
| Temperature is the measurement of | the average kinetic energy of molecules |
| The motion of small particles due to collisions with molecules in a fluid is called | Brownian motion |
| The lowest possible temperature is | absolute zero |
| Heat is | a transfer of energy because of a difference in temperature |
| The force of attraction between two charged spheres can be calculated from | Coulomb's law |
| An electric current in a wire is a flow of | electrons |
| Regions where the magnetic fields of atoms are lined up in the same direction are known as | magnetic domains |
| A magnetic field is produced by | an electron current |
| Which of the following substances differs from the others with respect to electricity? (a) plastic (b) glass (c) copper (d) cotton | copper |
| A natural magnet is | lodestone |
| Ohm's law is correctly expressed by | I=V/R |
| A light bulb glows because | the filament is hot |
| Which of the following does not produce a magnetic field? (a) a current-carrying wire (b) a stationary electric charge (c) a moving electric charge (d) an electromagnet | a stationary electric charge |
| Why is repulsion rather than attraction a conclusive test of electrification? | Charged objects are attracted to uncharged objects by induction, whereas only like charged objects repel |
| The atoms of conductors and insulators are composed of the same constituents: electrons, protons, and neutrons. In what way, then, do conductors and insulators differ? | Conductors: Outer shell electrons are free to move from atom to atom Insulators: electrons are held in place |
| Why is standing in an open field during a thunderstorm a dangerous practice? | Lightning tends to seek the highest point. |
| Why is it dangerous to replace a 15-ampre fuse that blows repeatedly with one having a larger current rating? | If a higher-capacity fuse is used, the danger of fire is increased, because the circuit was designed to safely handle only a certain amount of current. |
| Why should we not put a penny behind a blown fuse? | Because it removes the protection of the fuse of the circuit breaker. |
| What causes gas? | Gas pressure results from collisions between molecules. |
Created by:
niinimoshe
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