07 - Practice Test

 1. Binary is a language that is made up of just two digits, namely 1 and 0. It is the language that computers utilize for the representation of data.



 2. Why do computers require Binary?

  Because they are made up of billions of tiny switches that can be either on or off

  Because they are made up of little chips that each have Binary cards in them

  Because they can't think correctly

  Because they are made up of two numbers which correspond to on and off

 3. What is the decimal value of this binary number? 0123593999999991


  This is not a binary number - they must have only 1s and 0s

  1 million


 4. What would your response to line 1 in the code below be?
print("001 in Binary is....2 in Decimal")
print("Do you agree with the above statement?")
answer=input("Tell me why:")
print(answer,".....very interesting response, thanks for your thoughts.")

  No - 001 in Binary is actually 10 in Decimal

  I have no idea

  Incorrect. 001 is 1 in Decimal


 5. 3 in Binary is 00000011
Explanation below:
The reason for this is simply because the two 1s are added up under 
their respective place values:
128   64   32   16   8   4   2    1
0     0    0     0   0   0   1    1   = 2 + 1 = 3



 6. What is the following binary number in Decimal? 00000111
Here are the place values to help you convert from Binary to Decimal.

128   64   32   16  8   4   2   1
0     0    0    0   0   1   1   1





 7. Look at the question in the image below. Select the right answer from the following options:





 8. Look at the question in the image below and select the right answer from the given options.





 9. Look at the question below and select the correct answer (a binary number) from the given options.





 10. The following image shows all the rules of Binary addition. For instance in Binary 0 + 0 = 0. And 1 + 1 = 0 carry 1. Look carefully at all the rules shown in the image and state whether it is True (correct) or False (incorrect)



 11. The first binary addition example has been done for you. Complete the second and select the correct answer from the options below.

  Answer: 1111

  Answer: 00000

  Answer: 1101

  Answer: 00011

 12. Watch the following video that demonstrates binary addition. Where does the student go wrong in his calculation?

  1 + 0 should be 0, so the student should have written 0 each time there was a 1+0

  1 and 1 always gives 0 carry 1, but the student wrote 1 (instead of 0 in the third column from the right)

  1 + 1 should give 2, and so the student should have written 2, instead of 1.

  The student has not made any mistakes

 13. What is the result of the following Binary addition?





 14. What is the outcome of this Binary addition? Select one of the options below.





 15. Look at the binary code given that has been used to create the image sequence. Which line has not been represented correctly?

  The last line

  All lines are represented correctly

  The first line

  All lines are represented incorrectly

 16. Graphics on a screen are made up of tiny blocks called ............





 17. Fill in the blanks: The more pixels on the screen, the higher the resolution and the _______________________ of the picture will be. The higher the image resolution, the more memory is needed to store the graphic.

  better the quality

  dimmer the colours

  brighter the colours

  worse the quality

 18. Read the below statement about Bitmap images and fill in the blanks.
Bitmap images are widely used on digital cameras, smartphones and online. 
Common bitmap image file types include JPEG, GIF and PNG. 
Bitmaps are also known as pixelmaps or raster graphics.
Bitmap images are organised as a grid of coloured squares called pixels 
(short for 'picture elements'). 

When zooming in or enlarging a 
bitmap image, the pixels are stretched and made into larger blocks. 

This is why bitmap images appear as __________________
when enlarged too much.

  of poor quality

  black as coal

  white as snow

  of good quality

 19. Each colour of an image is displayed as a ___________ number.





 20. In the black-and-white image below, each pixel is either black or white. You need a binary value for each different colour. As each pixel is either black or white, this image can be encoded with a value of ................

  0 for white and 1 for black

  0 for white and black

  1 for white and 0 for black

  1 for white and 1 for black

 21. The colour depth of an image is measured in bits. The number of bits indicates how many colours are available for each pixel. In the black and white image, only ___ colours are needed. This means it has a colour depth of 1 bit. (1 bit can be either 0 or 1





 22. A 2-bit colour depth would allow ______ different values: 00, 01, 10, 11. This would allow for a range of colours such as shown in the image below.





 23. Most computer systems and digital cameras use ______-bit images. _____ in binary is 1111 1111 1111 1111 1111 1111. This means there are over 16 million possible colours per pixel.





 24. So what about the human eye? Some experts estimate that we can distinguish perhaps as many as 10 million colors. Others estimate about 1 million, but 10 million is the top estimate. True or False?



 25. Look carefully at the table below. It shows the colour depth and the available colours relating to the colour depth.The greater the colour depth (bits per pixel), the _____ colours are available.





 26. How many colours can be represented by an 8 bit colour depth? (you may want to refer to the colour depth table)





 27. The two different types of images you can have are: Vectors and Bitmaps



 28. R_____________ is a measure of pixel density, usually measured in dots per inch (dpi). Images on websites usually have a resolution of 72 dpi.





 29. High quality printed images in books and magazines have a _______ resolution than computer screens. Magazines often use either 300 dpi or even 600 dpi.





 30. It is useful to know that image files usually also contain _____________. ___________ means 'data about data' and provides information about the image. The information could include any or all of the following:
file format - eg JPEG, GIF or PNG
colour depth
time and date the image was last changed
camera settings when the photo was taken





 31. What is 11 in Decimal and how many bits have been used?

  It is 3 in Decimal and two bits have been used

  It is 2 in Decimal and three bits have been used

  It is 4 in Decimal and four bits have been used

  None of the above

 32. What is the highest positive number you can store using two bits?





 33. What is the highest positive number you can store using three bits?





 34. The Decimal number system is the only number system used by humans through the ages.