Physics Chapter 23
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
Correct Answer
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
Correct Answer
B. Current -
- 3.
A wire that carries an electric current
- A.
Is electrically charged
- B.
May be electrically charged
- C.
Is never electrically charged
Correct Answer
B. May be 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
Correct Answer
A. 6 joules -
- 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
Correct Answer
A. Charge flows in a circuit -
- 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
Correct Answer
C. By interacting with an established electric field -
- 7.
Heat a copper wire and its electric resistance
- A.
Decreases
- B.
Remains uncharged
- C.
Increases
Correct Answer
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
Correct Answer
C. Increases -
- 9.
A wire carrying a current is normally charged
- A.
Negatively
- B.
Positively
- C.
Not at all
Correct Answer
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
Correct Answer
B. Changes magnitude and direction with time -
- 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
Correct Answer
C. 12 A -
- 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
Correct Answer
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
Correct Answer
B. 5 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
Correct Answer
D. The electrical conductor itself -
- 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
Correct Answer
C. Atoms in the light bulb filament -
- 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
Correct Answer
A. Woman's body -
- 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
Correct Answer
A. A fraction of a centimeter per second -
- 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
Correct Answer
D. Less than 1 cm/s -
- 19.
Alternating current is normally produced by a
- A.
Battery
- B.
Generator
- C.
Both of these
- D.
Neither of these
Correct Answer
B. Generator -
- 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
Correct Answer
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
Correct Answer
B. Less than the resistance of either lamp -
- 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
Correct Answer
A. More than the resistance of either lamp -
- 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
Correct Answer
C. Series -
- 24.
Modern automobile headlights are connected in
- A.
Parallel
- B.
Perpendicular
- C.
Series
- D.
None of these
Correct Answer
A. Parallel -
- 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
Correct Answer
B. The same electrons -
- 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
Correct Answer
A. Less -
- 27.
In an electric circuit, the safety fuse is connected to the circuit in
- A.
Series
- B.
Parallel
Correct Answer
A. Series -
- 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
Correct Answer
D. 2 ohms, and when in parallel 1/2 ohm -
- 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
Correct Answer
B. A fuse -
- 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
Correct Answer
C. Smoothing pulsed current -
- 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
Correct Answer
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
Correct Answer
C. 110 joules of energy are given up by each coulomb of charge making up the current in the circuit -
- 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
Correct Answer
C. A generator which is not shown -
- 34.
A capacitor is used to store
- A.
Charge
- B.
Energy
- C.
Both
- D.
Neither
Correct Answer
C. Both -
- 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
Correct Answer
A. Zero -
- 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
Correct Answer
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
Correct Answer
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
Correct Answer
A. Thick filament -
- 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
Correct Answer
B. Thin filament -
- 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
Correct Answer
B. Decreases -
- 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
Correct Answer
A. Increases -
- 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
Correct Answer
D. Through both the battery and the rest of the circuit -
- 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
Correct Answer
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
Correct Answer
B. Less 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
Correct Answer
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
Correct Answer
B. 0.5 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
Correct Answer
D. 96 W -
- 48.
The headlights, radio, and defroster fan in an automobile are connected in
- A.
Series
- B.
Parallel
Correct Answer
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
Correct Answer
A. 2.4 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
Correct Answer
C. 36 W -
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