Deck 1: The Basics - Sound, Electrical Signal, Electromagnetic Spectrum

Question 1

Briefly explain how a musical note and the color green are alike.

Answer 1

A musical note and the color green are alike in that they both evoke a sense of calm and tranquility. Just as the color green is often associated with nature and growth, a musical note can also bring a sense of harmony and natural beauty. Both can also have a soothing effect on the mind and body, making them similar in their ability to create a sense of peace and relaxation.

Question 2

Which of the following does NOT directly determine whether a signal will arrive and make sense to its recipient when your voice travels through the air?

A) variations in frequencies
B) time of day
C) distance between the sender and receiver
D) loudness of the signal

Answer 2

time of day

Question 3

The time period used to measure the frequency of sound waves is:

A) 0.1 second
B) 0.5 minute
C) 1.0 second
D) 1.0 minute

Answer 3

1.0 second

Question 4

How many cycles per second are there in a frequency of 140 Hz?

A) 70
B) 140
C) 10
D) 2

Question 5

The power or strength of a signal is called its:

A) amplitude
B) frequency
C) signal level
D) shock wave effect

Question 6

When you turn your radio up, what increases?

A) amplitude
B) wavelength
C) Hz
D) signal

Question 7

Humans can generally hear sounds that fall within the frequency range of:

A) 20 Hz to 20,000 Hz
B) 300 Hz to 4000 Hz
C) anything below 20,000 Hz
D) 4000 Hz and over

Question 8

Which of the following statements is true of shock wave effect?

A) it is a characteristic of analog signals
B) it is the result of excited electrons that push each other all the way down a wire conductor
C) it allows signals to cover great distances almost simultaneously
D) all of the above

Question 9

Which of the following is not a property of impedance?

A) capacitance
B) inductance
C) resistance
D) voltage

Question 10

Which of the following terms of exponential notation represents 1,000,000,000?

A) micro
B) kilo
C) mega
D) giga

Question 11

The acronym for the standards organization that is responsible for ensuring that each country will be able to exchange information with other countries is:

A) ISO
B) ITU
C) ANSI X.3T9.5
D) MDR

Question 12

Communication in its most primitive form is nothing more than transferring information between transmitter and receiver across a(n) ________.

Question 13

Sound creates a(n) ________ in the media it travels across, whether that medium is air or a copper wire.

Question 14

Frequency used in communications is measured in ________, which represents the number of cycles per second.

Question 15

________ signals are the electrical waves that are produced by a telephone transmitter and travel down telephone wires.

Question 16

The resistance of a medium is measured in ________.

Question 17

The distance a signal can travel is ________ by the attenuation caused by the capacitive effect of the circuit.

Question 18

________ are used to measure signal level.

Question 19

________ (acronym) radio is a source signal that impresses itself onto a carrier wave by manipulating the amplitude of the signal.

Question 20

The magnetic field surrounding the earth, which is capable of carrying multiple frequencies of varying wavelengths, is called the ________ spectrum.

Question 21

________ light is the name given to the sun's frequency type.

Question 22

Copper wire, air, fiber optic strands, and water are the sources of sound waves that vibrate molecules in a medium.

Question 23

A very long wavelength indicates a very high frequency.

Question 24

Normal human speech falls within the frequency range of 20 Hz to 20,000 Hz.

Question 25

The function of impedance is to assist the signal as it travels down a medium.

Question 26

Inductance and capacitance affect AC signals, while resistance affects both AC and DC signals.

Question 27

Resistance and inductance can be viewed as siblings with completely opposite personalities, and in fact they cancel out each other.

Question 28

The purpose for using load coils is so that a signal can travel greater distances before it fades away.

Question 29

The loudest sound that humans can tolerate has a signal strength of about 2 milliwatts.