NEW
Font size
WorksheetsTERM 1 REVISION
Total questions: 20
Worksheet time: 10mins
A microwave has a frequency of f1. A gamma ray has a frequency of f2. Which one has a greater speed?
The microwave
They have the same speed
The gamma ray
We need to know the wavelengths to be able to solve
Which of the following lists of electromagnetic waves is in order of increasing wavelength?
gamma rays, X-rays, radio waves, ultraviolet
microwaves, light, ultraviolet, gamma rays
ultraviolet, light, microwaves, radio waves
X-rays, gamma rays, infrared, light
Amplitude modulation is
Change in amplitude of the carrier according to modulating signal
Change in frequency of the carrier according to modulating signal
Change in amplitude of the modulating signal according to carrier signal
Change in amplitude of the carrier according to modulating signal frequency
The graph shows the frequency spectrum of an AM radio wave carrying an audio signal of a single frequency. Determine the frequency of the audio signal.
1kHz
3 kHz
5 kHz
7 kHz
An analogue signal is sampled at a frequency of 5.0 kHz. Each sample is converted into a four-bit number and transmitted as a digital signal. Show in which number equal to code 0110.
2
4
6
8
Which of the following emits infrared radiations?
Hot iron
Ice
Freezing mixture
Wet cloth
How can you get a higher quality digital signal from an analog recording?
lower the amplitude of the analog signal
raise the amplitude of the analog signal
lower the sampling rate of the analog signal
raise the sampling rate of the analog signal
Binary code uses what type of symbols to communicate?
bytes and digits
analog and digital
dots and dashes
pixels and bits
The process of changing a property of a wave to transmit information is called
Moderation
Modulation
Attenuation
Induction
Define the term 'analogue'.
it uses continuous data. For example, a clock hand shows the time, with a smoothly moving seconds hand.
it uses discrete data, which has two states, either on or off. This is represented by a 1 or a 0.
it uses both continuous and discrete values
it used neither discrete nor continuous values of data
Which one of the following statements concerning electromagnetic waves is false?
EM waves are longitudinal.
EM waves transfer energy through space.
EM waves do not require a physics medium of propagation.
Electromagnetic waves can propagate through a material susbtance.
In amplitude modulation, the amplitude of the signal must be ________.
greater than the twice of the amplitude of the carrier wave.
less than half of the amplitude of the carrier wave.
same as the amplitude of the carrier wave
equal to one third of the amplitude of the carrier wave.
Which of the following communication systems is listed in order of increasing frequency?
international radio, national radio, FM radio, satellite TV
satellite TV, FM radio, national radio, international radio
FM radio, national radio, international radio, satellite TV
satellite TV, FM radio, national radio, international radio
Which of the following is NOT true about polar orbiting satellite?
In much lower orbit than geostationary satellite.
It closely follows the Earth's meridian lines.
It provides more detailed information about violent storms and cloud systems
Continuous communication outside the are of coverage is possible.
The carrier frquency of the link between the ground and the satellite is called
a downlink
an uplink
an amplifying link
a power link
What do the values 14/11 GHz mean in satellite communication system?
the uplink and downlink frequencies
variation is sky wave frequencies
TV channels available in the region
variation in space wave frequencies
What should be the correct label for block X and Y?
X: ADC / Y: parallel to serial converter
X: parallel to serial converter / Y: ADC
X: DAC / Y: serial to parallel converter
X: serial to parallel converter / Y: DAC
