Physics Chapter 23
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Physics Chapter 23
- 1.Electrons are made to flow in a wire when there is
- A.
An imbalance of charges in the wire
- B.
More potential energy at one end of the wire than the other
- C.
A potential difference across its ends
- 2.An ampere is a unit of electrical
- A.
Pressure
- B.
Current
- C.
Resistance
- D.
All of these
- E.
None of these
- 3.A wire that carries an electric current
- A.
Is electrically charged
- B.
May be electrically charged
- C.
Is never electrically charged
- 4.A coulomb of charge that passes through a 6-volt battery is given
- A.
6 joules
- B.
6 amperes
- C.
6 ohms
- D.
6 watts
- E.
6 newtons
- 5.Which statement is correct?
- A.
Charge flows in a circuit
- B.
Voltage flows through a circuit
- C.
Resistance is established across a circuit
- D.
Current causes voltage
- 6.Electrons move in an electrical circuit
- A.
By being bumped by other electrons
- B.
By colliding with molecules
- C.
By interacting with an established electric field
- D.
Because the wires are so thin
- E.
None of these
- 7.Heat a copper wire and its electric resistance
- A.
Decreases
- B.
Remains uncharged
- C.
Increases
- 8.Stretch a copper wire so that it is thinner and the resistance between its ends
- A.
Decreases
- B.
Remains unchanged
- C.
Increases
- 9.A wire carrying a current is normally charged
- A.
Negatively
- B.
Positively
- C.
Not at all
- 10.In an ac circuit, the electric field
- A.
Increases via the inverse square law
- B.
Changes magnitude and direction with time
- C.
Is everywhere the same
- D.
Is non-existent
- E.
None of these
- 11.The current through a 10-ohm resistor connected to a 120-V power supply is
- A.
1 A
- B.
10 A
- C.
12 A
- D.
120 A
- E.
None of these
- 12.A 10-ohm resistor has a 5-A current in it. What is the voltage across the resistor?
- A.
5 V
- B.
10 V
- C.
15 V
- D.
20 V
- E.
More than 20 V
- 13.When a 10-V battery is connected to a resistor, the current in the resistor is 2A. What is the resistor's value?
- A.
2 ohms
- B.
5 ohms
- C.
10 ohms
- D.
20 ohms
- E.
More than 20 ohms
- 14.The source of electrons in an ordinary electrical circuit is
- A.
A dry cell, wet cell or battery
- B.
The back emf of motors
- C.
The power station generator
- D.
The electrical conductor itself
- E.
None of these
- 15.The source of electrons lighting an incandescent as light bulb is
- A.
The power company
- B.
Electrical outlet
- C.
Atoms in the light bulb filament
- D.
The wire leading to the lamp
- E.
The source voltage
- 16.A woman experiences an electrical shock. The electrons making the shock come from the
- A.
Woman's body
- B.
Ground
- C.
Power plant
- D.
Hairdryer
- E.
Electric field in the air
- 17.In a common dc circuit, electrons move at speeds of
- A.
A fraction of a centimeter per second
- B.
Many centimeters per second
- C.
The speed of a sound wave
- D.
The speed of light
- E.
None of these
- 18.When a light switch is turned on in a dc circuit, the average speed of electrons in the lamp is
- A.
The speed of sound waves in metal
- B.
The speed of light
- C.
1000 cm/s
- D.
Less than 1 cm/s
- E.
Dependent on how quickly each electron bumps into the next electron
- 19.Alternating current is normally produced by a
- A.
Battery
- B.
Generator
- C.
Both of these
- D.
Neither of these
- 20.The electric power of a lamp that carries 2 A at 120 V is
- A.
1/6 watts
- B.
2 watts
- C.
60 watts
- D.
20 watts
- E.
240 watts
- 21.When two lamps are connected in parallel to a battery, the electrical resistance that the battery senses is
- A.
More than the resistance of either lamp
- B.
Less than the resistance of either lamp
- C.
None of these
- 22.When two lamps are connected in series to a battery, the electrical resistance that the battery senses is
- A.
More than the resistance of either lamp
- B.
Less than the resistance of either lap
- C.
None of these
- 23.On some early automobiles both headlights went out when one bulb burned out. The headlights must have been connected in
- A.
Parallel
- B.
Perpendicular
- C.
Series
- D.
Haste
- 24.Modern automobile headlights are connected in
- A.
Parallel
- B.
Perpendicular
- C.
Series
- D.
None of these
- 25.There are electrons int he filament of the ac lamp in your bedroom. When you turn on the lamp and it glows, the glowing comes from
- A.
Different electrons; the ones that flow in the circuit to your lamp
- B.
The same electrons
- C.
The positive charges that flow in the filament
- 26.A 100-watt lamp glows brighter than a 25-Watt lamp. The electrical resistance of the 100-watt lamp must be
- A.
Less
- B.
Greater
- C.
The same
- 27.In an electric circuit, the safety fuse is connected to the circuit in
- A.
Series
- B.
Parallel
- 28.When a pair of 1-ohm resistors are connected in series, their combined resistance is
- A.
1 ohm, and when connected in parallel, 2 ohms
- B.
2 ohms, and when in parallel 1 ohm
- C.
1/2 ohm, and when in parallel, 2 ohms
- D.
2 ohms, and when in parallel 1/2 ohm
- E.
Non of these
- 29.a circuit breaker serves the same purpose as
- A.
A switch
- B.
A fuse
- C.
A capacitor
- D.
A battery
- E.
None of these
- 30.A capacitor is useful in
- A.
Boosting the energy output of a circuit
- B.
Increasing the current in a resistor
- C.
Smoothing pulsed current
- D.
Switching dc to ac in a circuit
- E.
Increasing or decreasing voltage
- 31.An electrical diode is useful for
- A.
Storing electrical energy
- B.
Boosting voltage
- C.
Limiting current
- D.
Voltage modification
- E.
Changing ac to dc
- 32.In the 110-volt circuit shown,
- A.
110 coulombs of charge flow through the lamp every second
- B.
110 joules of energy are converted to heat and light in the circuit every second
- C.
110 joules of energy are given up by each coulomb of charge making up the current in the circuit
- D.
110 joules of energy are shared among all the coulombs in the circuit at any instant
- E.
None of the above
- 33.In the circuit of figure 23-A, energy is given to the moving charges by
- A.
The bulb
- B.
The wires
- C.
A generator which is not shown
- D.
Non of these
- 34.A capacitor is used to store
- A.
Charge
- B.
Energy
- C.
Both
- D.
Neither
- 35.The number of electrons delivered daily to an average American home by an average power utility in the mid 1980s was
- A.
Zero
- B.
110
- C.
220
- D.
Billion of billions
- E.
None of these
- 36.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
- A.
Thick filament
- B.
Thin filament
- C.
The same in each lamp
- 37.Two lamps, one with a thick filament and one with a thin filament, are connected in parallel to a battery. the voltage is greatest across the lamp with the
- A.
Thick filament
- B.
Thin filament
- C.
Both voltages are the same
- 38.Two lamps, one with thick filament and one with a thin filament of the same material, are connected in parallel to a battery. the current is larger in the lamp with the
- A.
Thick filament
- B.
Thin filament
- C.
Current is the same in both
- 39.Two lamps, one with a thick filament and one with a thin filament of the same material, are connected in series to a battery. the voltage is greater across the lamp with the
- A.
Thick filament
- B.
Thin filament
- C.
Voltage is the same for both
- 40.As more lamps are put into a series circuit, the overall current in the power source
- A.
Increases
- B.
Decreases
- C.
Stays the same
- 41.As more lamps are put into a parallel circuit, the overall current in the power source
- A.
Increases
- B.
Decreases
- C.
Stays the same
- 42.A circuit is powered with a battery. charge flows
- A.
Out of the battery and into the circuit
- B.
From the negative battery terminal to the positive terminal
- C.
After a couple seconds passes
- D.
Through both the battery and the rest of the circuit
- E.
None of these
- 43.When we say an appliance "uses up electricity," we really are saying that
- A.
Current disappears
- B.
Electric charges are dissipated
- C.
The main power supply voltage is lowered
- D.
Electrons are taken out of the circuit and put somewhere else
- E.
Electron kinetic energy is changed into heat
- 44.Compared to the resistance of two resistors connected in series, the same two resistors connected in parallel have
- A.
More resistance
- B.
Less resistance
- C.
The same resistance
- 45.If you plug an electric toaster rated at 110 V into a 220-V outlet, the current in the toaster wil be about
- A.
Half what it should be
- B.
The same as if it were plugged in 110 V
- C.
More than twice what it should be
- D.
Twice what it should be
- 46.A 60-watt light bulb is connected to a 120-volt plug. what is the current in the light bulb?
- A.
0.25 A
- B.
0.5 A
- C.
2 A
- D.
4 A
- E.
More than 4 A
- 47.What is the power rating of a light bulb if 0.8 A flow through it when it is connected to a 120-volt outlet?
- A.
12 W
- B.
15 W
- C.
60 W
- D.
96 W
- E.
120 W
- 48.The headlights, radio, and defroster fan in an automobile are connected in
- A.
Series
- B.
Parallel
- 49.A 4-ohm resistor is connected in parallel with a 6-ohm resistor. this combination produces an equivalent resistance of
- A.
2.4 ohms
- B.
4 ohms
- C.
5 ohms
- D.
5.5 ohms
- E.
10 ohms
- 50.The power dissipated in a 4-ohm resistor carrying 3 A is
- A.
7 W
- B.
18 W
- C.
36 W
- D.
48 W
- E.
Not enough information to say
- 51.Which is more dangerous, touching a faulty 110-volt light fixture, or a van de graaff generator charged to 100,00 volts?
- A.
Touching the light fixture
- B.
Touching the generator
- C.
Touching both are about equally dangerous
- 52.A 60- W light bulb and a 100-W light bulb are each rated at 120 V. which light bulb has a larger resistance?
- A.
The 60- W bulb
- B.
The 100- W bulb
- C.
Both have the same resistance
- 53.A 60 W light bulb and a 100- W light bulb are each connected to a 120 V outlet. Which light bulb has more current in it?
- A.
The 60- W bulb
- B.
The 100- W bulb
- C.
Both have the same current
- 54.Compared to the filament thickness of a 60-W light bulb, the filament of a 100-W light bulb will be
- A.
Thinner
- B.
Thicker
- C.
The same
- 55.Compared to a single lamp connected to a battery, two identical lamps connected in series to the same batter will carry
- A.
More current
- B.
Less current
- C.
The same current
- 56.Compared to a single lamp connected to a battery, two lamps connected in parallel to the same battery will carry
- A.
More current
- B.
Less current
- C.
The same current
- 57.An electric hater is rated at 300 W when used in a 110-V circuit. The safety fuse n the circuit can handle 15 A of current. how many heaters can be safely operated in the circuit?
- A.
2
- B.
3
- C.
4
- D.
5
- E.
More than 5
- 58.A heater uses 20 A when used in a 110-V line. If electric power costs 10 cents per kilowatt hour, the cost of running the heater for 10 hours is
- A.
$0.22
- B.
$0.55
- C.
$2.20
- D.
$5.50
- E.
None of these
- 59.The current through two identical light bulbs connected in series is 0.25 A. the voltage across both bulbs is 110 V. the resistance of a single light bulb is
- A.
22 ohms
- B.
44 ohms
- C.
220 ohms
- D.
440 ohms
- E.
None of these
- 60.A power line with a resistance of 2 ohms has a current of 80 A in it. the power dissipated in the line is
- A.
40 W
- B.
160 W
- C.
320 W
- D.
12800 W
- E.
None of these
- 61.What is the resistance of a 120-W incandescent lamp connected to a 120-V power supply?
- A.
1 ohm
- B.
60 ohms
- C.
100 ohms
- D.
144 ohms
- E.
None of these
- 62.Compared to the amount of electric current in the filament of a lamp, the amount of current in the connecting wire is
- A.
Definitely less
- B.
Often less
- C.
Actually more
- D.
The same
- E.
Incredibly all of these
- 63.Connect a pair of lamps in series and you draw current from the connected battery. connect the same lamps in parallel and you draw
- A.
The same current
- B.
More current
- C.
Less current
- D.
Sometimes more, sometimes less
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