
Questions No. 01 Marks (12)
Alice and Bob are playing a game by encoding their messages in an 8bit binary. Trudy wants to understand or modify their messages. You have to help Trudy to convert encoded messages into a readable format by performing the following operations.
Solution:
01001000
0×2^{7}+1×2^{6}+0×2^{5}+0×2^{4}+1×2^{3}+0×2^{2}+0×2^{1}+0×2^{0}
0+64+0+0+8+0+0+0
72 ans
01101001
0×2^{7}+1×2^{6}+1×2^{5}+0×2^{4}+1×2^{3}+0×2^{2}+0×2^{1}+1×2^{0}
0+64+32+0+8+0+0+1
105Ans
00101100
0×2^{7}+0×2^{6}+1×2^{5}+0×2^{4}+1×2^{3}+1×2^{2}+0×2^{1}+0×2^{0}
0+0+32+0+8+4+0+0
44ans
Convert the 8digit binary into hexadecimal. (3 marks)
Solution:
01001000
split into 2 groups
0100 1000
4 8
48_{16}
01101001
split into 2 groups
0110 1001
6 9 =69_{16}
_{ }
00101100
split into 2 groups
0010 1100
2 c
2c_{16 ans }
Solution:
01001000 01101001 00101100
Aschii code 72 105 44
H i ,
Answer in texual form is= Hi,
Questions No 02 Marks (04)
The diagram below shows a circuit with four gates and four inputs (A, B, C and D).
If the final output is 0, what are the possible states of inputs A, B, C and D?
A  1 
B  1 
C  1 
D  1 
Questions No. 03 Marks (04)
The following table lists the extensions of some file formats used by the website of “Virtual University of Pakistan”. Match each extension to an example of data that it can store:
Extension  Example  Answer 
.mp3  The logo of the Virtual University of Pakistan  .gif 
.zip  The photo of the Rector on the faculty page.  .jpeg 
.gif  The audio tracks of programming talkthroughs.  .mp3 
.jpeg  A compressed folder of admission documents.  .zip 
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