# Physics Semester Two, Test Three

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here is the multiple choice portion to our third test of the second semester TO ANSWER THESE QUESTION, BUT THE LETTER IN PARENTHESES, I.E., (A)

### (D)

The direction of an electric field is the direction of the force that would be experienced by
(A) an electron
(B) a neutron
(C) a molecule
(D) a proton
(E) a neutral atom

### (C)

The difference between AC & DC circuit is
(A) in the DC circuit, the electron move to the spot with the lower EP
(B) in AC circuit, the electrons move to the spot with the lower EP
(C) in an AC circuit, the current changes its direction
(D) in an AC circuit, there is no current
(E) there is no difference. the mean the same thing

### (C)

A proton and an electron are placed in an electric field. Which experiences the larger force?
(A) proton
(B) electron
(C) both experience equal forces
(D) neither experiences a forces

### (B)

Stretch a copper wire so that it is thinner and the resistance between its ends will
(A) decrease
(B) increase
(C) remain unchanged

### (A)

A kilowatt-hour is a unit used to measure
(A) energy
(B) power
(C) time
(D) voltage
(E) alternating current

### (C)

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

### (C)

when a 10-V battery is connected to a resistor, the current in the resistor is 2 A. what is the resistor's value?
(A) 0.2 ohms
(B) 2 ohms
(C) 5 ohms
(D) 10 ohms
(E) 20 ohms

### (A)

Electrical potential, measured in volts, is the ratio of electric energy to amount of electric
(A) charge
(B) current
(C) resistance
(D) voltage
(E) none of these

### (D)

When you turn on a lamp in your house, the electron that make it light up come from
(A) the power company
(B) the wall outlet
(C) the wire from the wall to your lamp
(D) they are already in the light bulb
(E) the power lines traveling from the company to your house

### (D)

In a 110-V circuit,
(A) 110 joules of energy are shared among all the coulombs in the circuit at any instant
(B) 110 joules of energy of charge flow through the lamp every second
(C) 110 of energy are converted to heat and light in the circuit every second
(D) 110 joules of energy are given up by each coulomb of charge making up the current in the circuit
(E) none of these

### (A)

The number of electrons being delivered to the average American home by an average power utility is
(A) zero
(B) 110
(C) 220
(D) billions of billions
(E) none of these

### (B)

A 60-W light bulb is connected to a 120 volts 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

### (C)

The power dissipated in a 4-ohm resistor carry 3 A is
(A) 48 W
(B) 18 W
(C) 36 W
(D) 7 W
(E) not enough to say

### (B)

A 40-W light bulb and a 100-W light bulb are each used wit a 120-V power source. Which light bulb has a larger resistance?
(A) the 100 bulb
(B) the 40-W bulb
(C) both have same resistance

### (A)

When a light switch is turned on in a dc circuit, the average speed of electron in the lamp is
(A) less than 1 cm/s
(B) 1000 cm/s
(C) the speed of light
(D)the speed of sound waves in metal
(E)dependent on how quickly each electron bumps into the next electron

### (B)

If you touch an electrical outlet, you will be shocked. if you touch it with wet hands, the shock is greater
(A) the voltage is greater
(B) the current is greater
(C) the resistance is greater
(D) the energy per charge is greater
(E) both (A) and (B)

### (C)

Which statement is correct?
(A) Voltage flows through a circuit
(B) Current causes voltage
(C) Current flows through a circuit
(D) Resistance is established across a circuit

### (E)

A bird can safely rest on a high voltage wire because
(A)the bird only says in one spot for a few seconds
(B) the bird's feel have a low resistance
(C) the wire is not insulated
(D) the bird has a low gravitational energy
(E) there is no electric potential difference across the bird's feet

### (D)

If the resistance in a circuit doubles but there are no changes to the voltage
(A) the current also doubles
(B) the current increases by a factor of 4
(C) the current is reduced to 1/4
(D) the current is cut in half

### (E)

If the 7 Coulombs of charge move past every point in a circuit every second, you know what
(A) the battery's voltage is 7V
(B) the power of the circuit is 7W
(C) the resistance of the circuit is 7 ohms
(D) the electric field has a strength of 7 N/C
(E) the current in the circuit is 7 A

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