Worksheets3.2 Data - Data representation
Total questions: 42
Worksheet time: 30mins
Name
Class
Date
1.
ASCII stands for...
a)
The American Standard Code for Information Interchange
b)
The Authentic Style Code for Information Interchange
c)
The American System Control for Information Interchange
d)
The Authentic System Coding for Information Interchange
2.
What is the ASCII code for ... A?
a)
65
b)
56
c)
97
d)
79
3.
What is the ASCII code for ... I?
a)
73
b)
37
c)
105
d)
150
4.
What is the ASCII code for ... E represented in binary?
a)
0100 0100
b)
0100 1000
c)
0100 0101
d)
0010 0101
5.
Bitmap ou Vector?
a)
Bitmap
b)
Vector
6.
Which resolution would give me a better quality image?
a)
720p
b)
1080p
c)
4k
d)
480p
7.
Images are stored using a grid of ______.
a)
Pixels
b)
Dots
c)
Bits
8.
What is an advantage of Bitmap images?
a)
They can be resized and keep their quality
b)
Big file sizes
c)
They can be very detailed
9.
How could I calculate the number of pixels in an image that has a resolution of 1920 x 1080?
a)
1920 x 1080
b)
1920 + 1080
c)
1920/1080
d)
1080/1920
10.
Bitmap or Vector?
a)
Bitmap
b)
Vector
11.
Which image type is best used for detailed and realistic images?
a)
Bitmap
b)
Vector
12.
Which image type becomes blurred when you zoom in?
a)
Bitmap
b)
Vector
13.
Which image type keeps the same image quality when zoomed in?
a)
Bitmap
b)
Vector
14.
Which image type is often a very large file size?
a)
Bitmap
b)
Vector
15.
Screen size can also be called...
a)
dots per inch
b)
Resolution
c)
HD size
d)
Backing storage
16.
A 4K TV and an HD TV may have the same dimensions (e.g. 42 inch TVs) but they have different resolutions. Why is this?
a)
The 4K has more dots per inch than the HD
b)
The HD has more dots per inch than the 4K
c)
The colour depth of the HD is higher
d)
The colour depth of the 4K is higher
17.
A bitmap image uses 1 and 0 to represent each pixel. Which of the following is true for this image?
a)
The image has 4 colours
b)
The image is in black and white
c)
The image is greyscale
d)
The image uses 256 colours
18.
A bitmap image uses 3 bits to represent each pixel. Which of the following is true for this image?
a)
The image has up to 8 colours
b)
The image is in black and white
c)
The image is greyscale
d)
The image uses 256 colours
19.
A bitmap image has a colour depth of 4 bits. What does this mean?
a)
The image uses 4 bits for every pixel
b)
The image has a resolution of 4K
c)
The image is 4 bits in size
d)
The image uses 256 colours
20.
What is meant by Colour Depth?
a)
Number of pixels in the image
b)
The number of colours available for each pixel
c)
How pixelated the image is
21.
How many colours can be represented with a 4 bit colour depth?
a)
2
b)
4
c)
16
d)
256
22.
Which of the following is not an image file? (4-6)
a)
PNG
b)
JPEG
c)
Bitmap
d)
MPEG
23.
What three colours are used to produce a broad array of colours in a computer system? (1-4)
a)
Green, Red, Orange
b)
Red, Green, Blue
c)
Yellow, Green, Red
24.
What is the resolution?
a)
256 pixels
b)
16 pixels
c)
324 pixels
d)
3000 pixels
25.
What is the resolution?
a)
82 pixels
b)
82 B
c)
64 pixels
d)
64 B
26.
The number of pixels that make up an image is known as the...
a)
Resolution
b)
Size
c)
Scalability
d)
Dimensions
27.
A bitmap image is made up of many coloured dots called...
a)
Pixels
b)
Vectors
c)
RGBs
d)
GIFs
28.
Every pixel is assigned a colour known as a RGB value. What does RGB stand for?
a)
Red, Green & Blue
b)
Red, Green & Black
c)
Red, Green & Brown
d)
Red, Grey & Black
29.
It is easy to convert a vector to a bitmap, but it is much harder to convert a bitmap to a vector.
a)
True
b)
False
30.
Which one is an image format?
a)
.docx
b)
.html
c)
.jpg
d)
.pdf
31.
The digital picture shown has been zoomed in and appears now to be very 'blocky'. What is the correct term for this?
a)
Poor resolution
b)
Digitisation
c)
Pixelation
d)
Granularity
32.
The iPhone shown on the right has a resolution of 1136 x 640 pixels. How is this an improvement on the older type of phone shown on the left?
a)
More pixels mean more colours
b)
More pixels mean a less pixelated image
33.
A file measuring 4 inches by 5 inches with a resolution of 200dpi and colour depth of 8 bits per pixel, the following calculation would be used to determine the file size in bits...
a)
4 x 200 x 5 x 200 x 8
b)
4 x 5 x 200
c)
4 + 5 x 200 x 8
d)
4 + 200 + 5 + 200 x 8
34.
When converting an analogue sound into digital, what does "sampling rate" mean?
a)
How many samples of the sound is taken per second.
b)
How many samples of the sound is taken per minute.
c)
It is the gap between each of the points where the analogue sound is sampled.
d)
It is the number of bits used for each sample.
35.
When converting an analogue sound into digital, what does "sample size" mean?
a)
How many samples of the sound is taken per second.
b)
How many samples of the sound is taken per minute.
c)
It is the gap between each of the points where the analogue sound is sampled.
d)
It is the number of bits used for each sample.
36.
When converting an analogue sound into digital, making the sample interval smaller will mean
a)
Less samples will be taken, therefore the sound will be less like the analogue recording. However the file size will be smaller.
b)
More samples will be taken, therefore the sound will be closer to the analogue recording. However the file size will be smaller.
c)
More samples will be taken, therefore the sound will be closer to the analogue recording. However the file size will be larger.
d)
Less samples will be taken, therefore the sound will be less like the analogue recording. However the file size will be larger.
37.
When converting analogue sound into digital, the amplitude is measured at regular intervals. The amplitude is
a)
The length of the sound wave.
b)
The height of the sound wave.
c)
The distance between two points.
d)
The pitch of the sound wave.
38.
With a sound wave, the higher the amplitude
a)
The louder the sound.
b)
The quieter the sound.
c)
The higher the pitch.
d)
The lower the pitch.
39.
With a sound wave, the shorter the amplitude
a)
The louder the sound.
b)
The quieter the sound.
c)
The higher the pitch.
d)
The lower the pitch.
40.
The higher the frequency (number of sound waves produced each second)
a)
The louder the sound.
b)
The quieter the sound.
c)
The higher the pitch.
d)
The lower the pitch.
41.
The most common sampling rate for sound files is 44.1 khz.
a)
True
b)
False
42.
The bit rate (sound) is calculated using the formula:
a)
Frequency × bit depth × channels = bit rate
b)
Bit depth × channels = bit rate
c)
Frequency / bit depth × channels = bit rate
d)
Frequency × bit depth / channels = bit rate
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