Science worksheets for class 7
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Properties of a digital wave include all the following EXCEPT
Binary code of consisting of 0,1
Starts and stops in transmission
Can be perfectly duplicated
Creates new energy
The following device uses analog waves to transmit information.
iPhone XR
Chimes from a church bell
Satellite signals
Microwave
Binary waves contain data represented with 2 values which are
up or down
0 or 1
happy or sad
right or left
How would you investigate to see if a device was disrupted due to static or electric power?
Go find the box it came in to see what year the device was made.
Evaluate the situation and change one variable to test.
Construct a drawing of all the parts in the device.
Throw it away and buy a new one.
An advantage a digital wave has over an analog wave is
It can be perfectly duplicated.
It is cheaper to make.
It is longer and conserves energy.
It doesn't cause cancer.
Which type of music recording has the reputation for sounding more LIVE with "hissing" sound from original performances?
Digital recordings
Binary data transfer
Analog recordings
Telegram recordings
Which of the following is an example of an Digital signal storage?
All of these
What is the main difference between analog and digital technology?
Digital technology reproduces sound more faithfully than analog technology
Analog technology stores information as sound waves; digital technology stores it as strings of ones and zeroes
Analog technology can be used to record sound and images; digital technology can only be used to record sound
Analog technology is based on binary code; digital technology is based on electromagnets
Place the following events in sequence: A) A string of ones and zeroes are encoded on a disc; B) A sound wave is sampled by an ADC; C) A sound wave is converted into an electric signal
B, A, C
B, C, A
C, A, B
C, B, A
Why does it take much less space to store digital information than analog information?
Digital devices only record pieces of sound waves, not full waves
Digital devices record sounds at lower volumes than analog devices
Digital devices decrease the amplitudes of sound waves, making them smaller
Digital devices automatically eliminate all background noise from the sounds they record
What might happen if your computer didn't have a digital- analog converter?
You wouldn't be able to record sound onto it
You wouldn't be able to store sound on its hard drive
You wouldn't be able to listen to digital recordings on it
You wouldn't be able to insert discs or CDs into it
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