Electromagnetic Energy, Electrostatics, Electricity, Magnetism TEST

Which of the following units would measure electrostatic charge?

 

volt

 

C/s

 

amperes

 

coulomb

coulomb

Which of the following does not cause electrification of an object?

 

friction

 

contact

 

induction

 

resistance

resistance

When a negatively charged object touches an uncharged object, what charge is then given to the uncharged object?

 

negative

 

positive

 

no charge is transferred

 

both negative and positive

negative

Which of the following is one of the laws of electrostatics?

 

electric charge is concentrated more where the curve is sharpest on a conductor

 

electric charge is through the middle of the conductor

 

unlike charges repel, like charges attract

 

electrostatic force is directly proportional to the square of the distance

electric charge is concentrated more where the curve is sharpest on a conductor

According to Coulomb's law, what happens to electrostatic force when the magnitude of the charges increased?

 

increased by the distance squared

 

decreased by the distance squared

 

increased proportionally

 

decreased proportionally

increased proportionally

What is the voltage in a circuit that has 6 amps and 40 ohms of resistance?

 

6.7

 

240

 

0.15

 

1440

240

How much power is consumed by a circuit with V = 220, I = 27.5, and a R = 8?

 

1760 W

 

1080 W

 

6050 W

 

220 W

6050 W

What is the amperage in a circuit that has 110 volts and 6 ohms of resistance?

 

0.05

 

660

 

36

 

18.3

18.3

Which of the following would define amperage?

 

1 cycle/second

 

1 electromotive force per second

 

1 coulomb/second

 

1 potential difference

1 coulomb/second

What term describes materials that allow the flow of electrons?

 

conductor

 

circuit

 

dielectric

 

insulator

 

conductor

As the length of the conductor increases, how is resistance affected?

 

decreases

 

increases by distance squared

 

stays the same

 

increases

increases

What unit is used to measure potential difference?

 

amperage

 

ohms

 

resistance

 

voltage

voltage

What type of circuit meter component must be connected in series for proper operation?

 

voltmeter

 

resistor

 

ammeter

 

battery

ammeter

What type of current flows in one direction and then in another direction?

 

steady direct

 

alternating

 

pulsating direct

 

none of the above

alternating

What is the power of a circuit with I = 8 and a R = 9?

 

72 W

 

400 W

 

576 W

 

648 W

576 W

What material that under some conditions behave as an insulator and in other conditions behaves as a conductor?

 

dielectric

 

insulator

 

superconductor

 

semiconductor

semiconductor

What does the following electrical symbol represent?
 

capacitor

 

resistor

 

battery

 

voltmeter

battery

To increase the resistance in a wire, which of the following may be done?

 

decrease the cross sectional area of the conductor

 

decrease the temperature of the conductor

 

decrease the length of the conductor

 

increase the cross sectional area of the conductor

decrease the cross sectional area of the conductor

What does this electrical symbol represent? 

 

capacitor

 

battery

 

resistor

 

switch

resistor

What is the unit of magnetism

 

Watt

 

Tesla

 

Newton

 

Coulomb

Tesla

What is the force between two negative charges with values of 7 C and 3 C at 1 meter?

 

21 C

 

12 C

 

2.3 N

 

21 N

21 N

As the magnetic field lines increase per area, what happens to magnetic strength?

 

increases

 

decreases

 

increases by the distance squared

 

decreases by the distance squared

increases

What would happen to the force of attraction between the south pole and north pole of two magnets was increased from 5 to 10 inches?

 

force is doubled

 

force is four times the original

 

1/2 the original force

 

1/4 the original force

1/4 the original force

Materials that are weakly repelled by either magnetic pole are called                         materials.

 

paramagnetic

 

nonmagnetic

 

ferromagnetic

 

diamagnetic

diamagnetic

What term describes the ability of a magnet to hold magnetic properties?

 

retentivity

 

susceptibility

 

permability

 

diamagneticability

retentivity

How are x-ray photons of low energy described?

 

low velocity and increased wavelengths

 

decreased frequency and increased wavelengths

 

high velocity and decreased wavelengths

 

increased frequency and decreased wavelengths

decreased frequency and increased wavelengths

What is the wavelength of a photon that has a frequency of 2.5x10¹⁸ Hz?

 

7.5x10^-10 m

 

1.2x10^-10 m

 

30x10¹⁰ m

 

60x10²⁶ m

1.2x10^-10 m

As the frequency decreases, the energy of the photon                   .

 

increases

 

decreases

 

stays the same

 

none of the above

decreases

The intensity of an x-ray tube is 85 mR at 30". What is the intensity at 15"?

 

21 mR

 

85 mR

 

150 mR

 

340 mR

340 mR

What term describes anatomical structures that absorb x-rays or that x-rays do not easily penetrate?

 

radiopaque

 

translucent

 

refraction

 

radiolucent

radiopaque

What is the frequency of a 35 keV x-ray photon? (Planck's Constant 4.15x10^-15) 

 

8.4x10¹⁸ 

 

145x10¹⁹ 

 

8.4x10^-19 

 

145x10^-18 

8.4x10¹⁸ 

What term described the distance from one crest to another in a sine wave

 

amplitude

 

velocity

 

frequency

 

wavelength

wavelength

What term describes the reduction in the number of x-rays photons as the beam passes through a patient?

 

attenuation

 

transmission

 

refraction

 

amplitude

attenuation

What is the wavelength of a 72 keV photon?

 

893 A

 

0.25 A

 

0.17 A

 

2.5 A

0.17 A

As frequency increases, wavelength                            .

 

increases

 

decreases

 

stays the same

 

decreases by the square of the distance

decreases