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Physics
Study guide for chapters 9 - 12 (& probably 13)
| Question | Answer |
|---|---|
| A thermos bottle has double glass walls with silver coating on the glass surfaces that face one another. The silver coating reduces the energy that is transferred by? | radiation |
| Hydrogen and oxygen molecules in a gas sample have the same temperature. This means the hydrogen molecules, on the average, have the same? | kinetic energy, but more speed |
| Both black and white road surfaces absorb sunlight. At the end of a sunny day the warmer road surface will be? | the black surface |
| When liquids change to a solid state, they? | release energy |
| Near the top of a mountain, water in an open pot boils at? | a lower temperature than at sea level |
| Cold water will warm to room temperature faster in a silver, black pot? | black pot |
| When water vapor condenses on the inside of a window the room becomes sightly? | warmer |
| The planet Earth loses heat mainly by? | radiation |
| If you were caught in freezing weather with only a candle for heat, you would be warmer in? igloo, car, wooden house, or tent | igloo |
| When a single charge placed at one corner of a squre, electric field at the center the square is F/q. If two other equal charges are at the adjacent corners of the square, electric field at the center of the square due to these three equal charges is | F/q |
| A highly charged child's balloon is not dangerous because? a)rubber is not a good conductor of electricity b)outside surface is positive charged c)potential difference between balloon and the child's hand is very small d)none of the choices are correct | none of the above choices are correct |
| Connect a pair of lamps in series and you draw current from the connected battery. Connect the same lamps in parallel and you draw? | more current |
| Compared to the resistance of two resistors connected in series, the same two resistors connected in parallel have? | less resistance |
| What is the resistance of a 120-w incandescend lamp connected to a 120 v power supply? | none of these |
| Compared to the filament thickness of a 60-W light bulb, the filament of a 100-W light bulb will be? | thicker |
| The fundamental force underlying all chemical reactions is? | electrical |
| Which statement is correct? a) Current is the primary cause of voltage b) Resistance flows through an open circuit? c) Voltage flows through an open or a closed circuit d) Charge flows in a closed circuit | charge flows in a closed circuit |
| When two lamps are connected in parallel to a battery, the electrical resistance that the battery senses is? | less than the resistance of either lamp |
| In an ac circuit, the electric field? a) is everywhere the same b) increases via the inverse square law c) changes magnitude and direction with time d)is not-existent e) none of these | changes magnitude and direction with time |
| The electrical force between charges depends only on the charges? | magnitude and separation distance |
| A power line with resistance of 2 ohms has a current of 80 A in it. The power dissipated in the line is? | 12,800 W Power = voltage * current voltage = current * resistance power = (80*2)*80 |
| The electric field inside the done of a Van de Graaff generator....? a) depends on the volume of the dome b) depends on the amount of charge the outside of dome c) choices A and B are correct d) non are correct | none are correct |
| Two lamps, one with a thick filament and one with a thin filament, are connected in series. The current is greater in the lamp with the ? | same in each lamp |
| A circuit breaker of ten serves the same purpose as a? | fuse |
| The ratio of the potential difference across a metallic conductor to the current in the conductor isknown as? | resistance |
| The intensity of cosmic rays bombarding the Earth's surface is largest at the? a) mid-latitudes b) poles c) equator | poles |
| The output power of an ideal transformer is....? | equal to the input power |
| The principal advantage of ac power over dc power is that? | ac voltage can be transformed via conventional transformers |
| Which pole of a compass needle points to a south pole of a magnet? | north pole |
| Magnetic compasses apparently were first used by? | pigeons, then Chinese |
| A certain transformer doubles input voltage. If the primary coil has 10A of current, then the current in the secondary coil is? | 5A |
| If the primary of a transformer were connected to a dc power source, the transformer would have a voltage output. | only while being connected or disconnected |
| Magnetism is due to the motion of electrons as they? | move around the nucleus and spin on their axes |
| Outside a magnet, magnetic field lines are conventionally drawn from | north to south |
| Magnetic domains normally occur in? a) copper b) silver c) iron d) all of these e) none of these | iron |
| When there is a change in the magnetic field in a closed loop of wire? a) a current is created in the loop of wire b) a voltage is induced in the wire c) electromagnetic induction occurs. d) all of these | all of these |
| Disregarding the effects of friction, a cyclist will coast farther when a lamp powered by a wheel generator is? | burned out |
| A wave travels an average distance of 6 meters in one second. What is the wave's velocity? | 6 m/s |
| The least energy required to produce forced vibration in an object occurs | at its natural frequency |
| The loudness of a sound is most closely related to its? | intensity |
| Refraction of sound can occur in? | both air and water |
| The phenonenon of beats results from sound | interference |
| A fishing boat captain returns to port saying, "It's rough out there - the waves are 4 meters high" He probably means that the amplitude of the waves is? | 2m |
| As a source of continuous sound approaches a constant speed, you will be aware of an apparent increasing of its a) frequency and wavelength b) loudness and wavelength c) loudness, frequency, and wavelength d) loudness and frequency e) none are correct | none are correct |
| High pitched sound has a high? | frequency |
| Which doesn't belong to the same family? a) longitudinal waves b) ultrasonic waves c) radio waves d) shock waves e) infrasonic waves | radio waves |
| A wiggle in time is a? | vibration |
| The frequency of a simple pendulum depends on? | its length and the acceleration due to gravity |
| A floating object oscillates up and down 2 complete cycles in 1 second as a water wave of wavelength 5 meters passes by. The speed of the wave is? | 10 m/s 5 * 2/1 sec |
| Sound refraction depends on the fact that the speed of sound is? | variable. |
Created by:
pkts68