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Worksheets

WIG2001 - QUIZ

Total questions: 60

Worksheet time: 39mins

Name
Class
Date
1.
What is resolution?
a)
It is the total number of pixels in an image
b)

It is a measure of how many dots are used in a given area

c)
It is a measure of how much an image has been compressed
d)
It is a measure of how big an object is
2.
Why do bitmap images often appear blocky if you enlarge them too much?
a)
Because there is only a limited amount of detail in the bitmap image
b)
Because of rounding errors in the calculations for the coordinates and formulae being used to draw the image
c)
Because adding new pixels to the image would take up all of the computer's memory as you zoom in
d)
The computer is  unable to correctly display it
3.

What is a vector image?

a)

An image composed of many tiny pixels, in which each individual pixel can be edited

b)

An image or graphic taken from the internet

c)

An image that can be scaled up or down with no loss of quality

d)

An image constructed using proportional formulas rather than pixels.

4.
What is an advantage of a vector image?
a)
Images can be scaled up or down with no loss of quality
b)
Individual pixels can be changed, which makes very detailed editing possible
c)
They have a large file size
d)
They look real
5.

Which of the following describes a low resolution graphic?

a)

Low number of pixels, low quality image, low file size

b)

Low number of pixels, high quality image, high file size

c)

High number of pixels, high quality image, low file size

d)

High number of pixels, high quality image, high file size

6.

an image with bit depth of 12 has ___ shades of gray?

a)

102

b)

12

c)

256

d)

4096

7.

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

8.

Digitizing coordinate values is called

a)

radiance

b)

illuminance

c)

sampling

d)

quantization

9.

The difference is intensity between the highest and the lowest intensity levels in an image is

a)

Noise

b)

Saturation

c)

Contrast

d)

Brightness

10.

Digitizing amplitude values is called

a)

radiance

b)

illuminance

c)

sampling

d)

quantization

11.
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
12.

How many colours is the picture showing given that it is using 4 bit colour depth?

a)
16 colours
b)
4 colours
c)
256 colours
d)
5 colours
13.
What will happen to the computer file size as the colour depth is increased?
a)
The file size will get smaller
b)
There will be no change in file size
c)
The file size will get bigger
d)
None of these
14.

Calculate the resolution in bytes: Width = 2, Height = 50, pixel depth = 16 levels

a)

1600

b)

400

c)

240

d)

30

15.
Which is NOT an effect of increasing the resolution in an image?
a)
More colours can be displayed.
b)
More binary will be required to create the image.
c)
Larger file size
d)
Higher quality image
16.
Which is NOT an effect of increasing the colour depth in an image?
a)
More colours can be displayed.
b)
More binary will be needed per pixel to create the image.
c)
Larger file size
d)
More pixels will be displayed in the image.
17.
How could you reduce the file size of an image?
a)
Reduce the numbr of colours used per pixel (colour depth)
b)
Reduce the dimensions of the image.
c)
Compress the file using a lossy compression file type.
d)
All of these
18.

What is digital image processing?

a)

Enhancing a dark image by making it brighter.

b)

Reducing the size of an image.

c)

Removing imperfections by restoration techniques.

d)

All of the above.

19.

Which digital imaging process is used here?

a)

Enhancement

b)

Manipulation

c)

Restoration

d)

Compression

20.

Which digital imaging process takes place when an image's visual appearance is improved

a)

Manipulation

b)

Restoration

c)

Enhancement

d)

Compression

21.

Which of the following statement describe the term pixel depth?

a)

It is the number of units used to represent each pixel in RGB space

b)

It is the number of mm used to represent each pixel in RGB space

c)

It is the number of bytes used to represent each pixel in RGB space

d)

It is the number of bits used to represent each pixel in RGB space

22.

Which of the following is the first and foremost step in Image Processing?

a)

Image acquisition

b)

Segmentation

c)

Image enhancement

d)

Image restoration

23.

___________ determines the quality of a digital image.

a)

The discrete gray levels

b)

The number of samples

c)

discrete gray levels & number of samples

d)

None of the mentioned

24.

The effect caused by the use of an insufficient number of intensity levels in smooth areas of a digital image _____________

a)

False Contouring

b)

Interpolation

c)

Gaussian smooth

d)

Contouring

25.

•What are the characteristics that are used to distinguish one color from the other? •

a)

a.Brightness, Hue and Saturation

b)

b.Hue, Brightness and Intensity

c)

c.Saturation, Hue

d)

d.Brightness, Saturation and Intensity

26.

Computer vision is

a)

low-level image processing

b)

Middle-level image processing

c)

Higher-level image processing

27.

Digitizing the coordinate values of a continuous image is called

a)

(A) Compression

b)

(B) Quantization

c)

(C) Sampling

d)

(D) Segmentation

28.

_____ is the total amount of energy that flows from light source.

a)

(A) Radiance

b)

(B) Darkness

c)

(C) Brightness

d)

(D) Luminance

29.

The digitization process, in which the digital image comprises M rows and N columns, necessitates choices for M, N, and the number of grey levels per pixel, L. M and N must have which of the following values?

a)

a) M have to be positive and N have to be negative integerr

b)

b) M have to be negative and N have to be positive integer

c)

c) M and N have to be negative integer

d)

d) M and N have to be positive integer

30.

Which of the following describes a low resolution graphic?

a)

Low number of pixels, low quality image, low file size

b)

Low number of pixels, high quality image, high file size

c)

High number of pixels, high quality image, low file size

d)

High number of pixels, high quality image, high file size

31.
Increasing the resolution of an image means that
a)
More pixels will be used to make up the image
b)
More colours will be used to make up the image
c)
The image size will be bigger
32.

an image with bit depth of 12 has ___ shades of gray?

a)

102

b)

12

c)

256

d)

4096

33.

What is the name of the innermost membrane present in the human eye?

a)

Sclera

b)

Choroid

c)

Retina

d)

Blindspot

34.

A binary Image has _________ pixel.

a)

8-bits

b)

1-bit

c)

2-bits

d)

3-bits

35.

To convert a continuous sensed data into Digital form, which of the following is required?

a)

Sampling

b)

Quantization

c)

Both Sampling and Quantization

d)

none

36.

The quality of a digital image is well determined by ___________

a)

The number of samples

b)

The discrete gray levels

c)

Both options

d)

None

37.
What is a pixel?
a)
Picture element - the small dots that make up an image.
b)
How an image is stored on the computer.
c)
A type of image
d)
A special type of photograph
38.
Bitmap or Vector?
a)
Bitmap
b)
Vector
39.
Bitmap or Vector?
a)
Bitmap
b)
Vector
40.
What is Bit Depth?
a)
The number of pixels used in an image
b)
The number of ‘bits’ needed to store colour
information for a pixel
c)
The size of the pixels used in an image
d)
The number of colours used in an image
41.

A signal is _____________ whereas an image is ___________

a)

1D, 2D

b)

2D, 1D

c)

1D, 3D

d)

3D, 1D

42.

The difference is intensity between the highest and the lowest intensity levels in an image is

a)

Noise

b)

Saturation

c)

Contrast

d)

Brightness

43.

Of the following, _________ has the maximum frequency.

a)

UV Rays

b)

Gamma Rays

c)

Microwaves

d)

Radio Waves

44.

In the Visible spectrum the ______ colour has the maximum wavelength.

a)

Violet

b)

Blue

c)

Red

d)

Yellow

45.

Which of the following transformations expands the value of dark pixels while the higher-level values are being compressed?

a)

Log transformations

b)

Inverse-log transformations

c)

Negative transformations

d)

Identity transformations

46.

Which of the transformation deals with basic linearity function in Gray level transformation for Image Enhancement ?

a)

Log and inverse-log transformations

b)

Negative and identity transformations

c)

nth transformations

d)

nth root transformations

47.

In which type of slicing, highlighting a specific range of gray levels in an image often is desired?

a)

Gray-level slicing

b)

Bit-plane slicing

c)

Contrast stretching

d)

Byte-level slicing

48.

In a dark image, the components of histogram are concentrated on which side of the gray scale?

a)

High

b)

Medium

c)

Low

d)

Evenly distributed

49.

Decomposing an image into 1-bit planes is

a)

contrast slicing

b)

intensity slicing

c)

bit plane slicing

d)

gray plane slicing

50.

Identify which color model is intended for electronic display.

a)

Additive

b)

Subtractive

c)

Pantone

d)

Hex Codes

51.

Identify the color model seen here.

a)

RGB/Subtractive

b)

RGB/Additive

c)

CMYK/Subtractive

d)

CMYK/Additive

52.

Which EM waves have the longest wavelength?

a)

radio

b)

x-rays

c)

ultraviolet

d)

gamma rays

53.

Which EM waves are have the highest energy & are the most dangerous?

a)

radio

b)

gamma rays

c)

infrared

d)

x-rays

54.

The diagram shows a person observing a thunderstorm located several kilometers away. The person hears the thunder several seconds after seeing the lightning. Which statement accurately explains the difference in observations of sound and light by the observer?

 

a)

Human eyes see light faster than their ears can hear sound.

b)

The medium the waves are traveling through is different for each type of wave.

c)

Light waves travel faster than sound waves.

d)

Sound waves travel faster than light waves.

55.

The diagram below shows a pencil in a glass of water. When viewed from the side, the pencil appears to be broken. What process causes this to happen?

a)

absorption

b)

evaporation

c)

reflection

d)

refraction

56.

What do electromagnetic waves NOT need to transfer energy?

a)

matter

b)

speed

c)

wavelength

d)

frequency

57.

Increasing the amplitude of a wave ______ the wave’s energy.

a)

Increases

b)

Decreases

c)

Does not change

58.

Which wave has a low frequency, a long wavelength, and low energy?

a)

A

b)

B

c)

Not enough information to determine

59.
Alpha-channel present in some images refers to:
a)
Transparency of pixels.
b)
Quality of a file.
c)
The order in which alternative pixels are loaded.
d)
Degree of file compression applied to an image file.
60.
Identify a true statement:
a)
Image files can be compressed by setting pixels with similar colour to the exactly same colour.
b)
Compressing files improves their quality.
c)
Resolution doesn't affect the printed size of an image.
d)
Black and white images have colour depth of two bits.

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