Arab
Open University
Faculty
of Computer Studies
M150 Data, computing and information
M150A
TMA01 – Fall 2013/2014
Cut-off date: 14-Dec-13
Total marks: 80
Arab Open University
Faculty of Computer Studies
M150 Data, computing and information
Question 1 [20 marks]
1. Read section 8.2 of the M150 course companion (You should have had
a copy of it with the course material and you can also view a soft copy of it
in the course CD ROM 1).
a. Briefly define the term plagiarism. [2]
b. How can you avoid plagiarism when writing your TMAs? [2]
2. Explain the difference between the Internet and the Web. [4]
3. Define a search engine. Give examples on two search engines you
use. [4]
4. Representations play a central role in facilitating communication
by establishing a relationship between some form and some meaningful content
subject to some convention; mention the two conditions for effective
representation. [4]
5. From your understanding of the term “complex representation”,
briefly explain why traffic signs are considered to be complex representations?
Explain the advantage of complex representations using the traffic
signs as an example. [4]
Question 2 [20 marks]
1. Any feature of the analogue world can be taken inside the boundary
of the computer using two-steps process. Mentions the two steps with brief
explanation giving an example that illustrates the steps. [6]
2. Show all the steps required to convert the binary value 111000101
to its decimal representation. [4]
3. Show all the steps required to convert the decimal value 1980 to
its octal representation. [4]
4. Consider an image of size 1000 X 720 pixels which requires 2160000
bytes to be stored inside the computer. Find the number
of bits used
to represent each pixel, the pixel amplitude and the coloring
system used
for the image. [6]
Question 3 [20 marks]
1. What is the function of the following: [3]
a. Control Unit.
b. Main Memory.
c. Compiler.
2. Use truth tables to show whether the following two Boolean
expressions are equivalent or not. [6]
NOT (A AND NOT B) NOT A OR B
3. The following flowchart diagram shows a loop structure program. [11]
a. From the diagram, specify: The condition, the loop body, and any
instruction(s) that is (are) not in the loop body.
b. How many times will the loop be executed?
c. What is the exact output after these instructions have been
executed?
You need to draw a simple tracing table that shows how you got your
answer.
d. What will be the output if the condition "NOT (a>10)"
is replaced by " NOT (a>10) AND (b>1)"?
Question 4 [20 marks]
−
Read the
edge length of a cube.
−
Calculate
the area and volume of the cube using the following formulas:
Area = 6 *(edge length)2
volume = (edge length)3
−
Print the
edge length, area and volume in the output window.
b. Run your program with two different values of edge length. In your
Solution document insert two screenshots showing the different resulted output.
– Ask the user if he wants to buy a "pc" or a
"laptop". Read the answer from the user and store it in a variable.
– If the user selected a "laptop" then ask the user to select
which color he wants "white" or "black". Read the answer
from the user and store it in a variable.
– Calculate the price of the user selection as follows:
- PC: 1700$.
- Black laptop: 2500$.
- White laptop: 3000$.
– Give the following discount on the price and calculate the discounted
price as follows:
- PC: 20%.
- Black laptop: 15%.
- White laptop: 10%.
– Print the user selection, price and discounted price in the output
window.
– Assume that all strings used in the program and entered by a user are
in small letters.
b. Test your program and run it to make sure it works properly. In
your Solution document insert three screenshots for the output:
– One showing the case when the user selected to buy a PC.
– One showing the case when the user selected to buy a black laptop.
– One showing the case when the user selected to buy a white laptop.
