El-Shorouk Academy
Higher Institute for Computer &
Information Technology
Department of Computer Science
Acad. Year : 2011/ 2012
Term
: First
Year
: First
Course
: Introduction in English
Unit (3)
Sheet -3-
1. What is the nerve centre of a PC?
Answer: The central processing unit or CPU.
2. What is the main function of a microprocessor?
Answer: Is an integrated circuit which executes program instructions and supervises the
computer's overall operation.
3. What is the three main parts that CPU consists of them?
Answer: The control unit, The arithmetic logic unit (ALU) , The registers.
4. What is the function of control unit?
Answer: Examines the instructions in the user's program, interprets each instruction and
causes the circuits and the rest of the components-disk drives, monitor,…-to be activated
to execute the functions specified.
5. What is the function of Arithmetic logic unit (ALU) ?
Answer: performs mathematical calculations ( + , - ,….) and logic operations ( and , or
,…).
6. What is the high speed units of memory?
Answer: The registers which are high-speed units of memory.
7. What is the function of the registers?
Answer: Registers used to store and control information.
8. What is the type of registers?
Answer: Program counter (PC), Instruction register (IR).
9. What is the function of program counter (PC)?
Answer: program counter keeps track of the next instruction to be performed in the main
memory.
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10.What is the function of instruction register (IR)?
Answer: Instruction register (IR) holds the instruction that is currently being executed.
11.What is the types of processors?
Answer: There are 16, 32 and 64-bit processors.
12. Where the programs and data which pass through the Central processor be
loaded? And why ?
Answer: The programs and data which pass through the Central processor must be loaded
into the main memory in order to be processed.
13. What will do when the user runs an application ?
Answer: when the user runs an application, the microprocessor looks for it on secondary
storage devices and transfer a copy of the application into the RAM area.
14. What is RAM stands for ?
Answer: RAM stands for ( Random Access Memory ).
15. Is RAM permanent storage or temporary storage ? Give reason for your answer.
Answer: RAM is temporary, because its information is lost when the computer is turned
off.
16. What is ROM stands for ?
Answer: ROM stands for (Random Access Memory).
17. Is ROM permanent storage? Give reason for your answer.
Answer: ROM is permanent storage and contains instructions needed by the processor,
because its information is not lost when the computer is turned off.
18.What is the function of expansion slots ?
Answer: Expansion slots that allow users to install adapters or expansion boards.
19. How the computer power and computer performance is determined?
Answer: The power and performance of a computer is partly determined by the speed of
its microprocessor.
20. What is the function of clock ?
Answer: A clock provides pulses at fixed intervals to measure and synchronize circuits
and units.
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21. What is the unit is used to measure clock speed?
Answer: The clock speed is measured in MHZ or GHZ.
22.What is MHZ and GHZ refers to ?
Answer: MHZ(megahertz) or GHZ(gigahertz) refers to the frequency at which pulses are
emitted.
23.What unit of frequency is used to measure processor speed?
Answer: Processor speed is measured by (MHz)mega hertz.
24. Find which of them is true and which of them is wrong?
1. The CPU directs and coordinates the activities taking place within the computer
system.
Answer: ( √ )
2. The arithmetic logic unit performs calculations on the data.
Answer: ( √ )
3. 32-bit processors can handle more information than 64-bit processors.
Answer: (×)
4. A chip is an electronic device composed of silicon elements containing a set of
integrated circuits.
Answer: ( √ )
5. RAM , ROM and secondary storage are the components of the main memory.
Answer: (×)
6. Information cannot be processed by the microprocessor if it is not loaded into the
main memory.
Answer: ( √ )
7. 'permanent' storage of information is provided by RAM (Random Access Memory)
Answer: (×)
8. The speed of the microprocessor is measured in gigahertz or megahertz. one GHz is
equivalent to one thousand MHZ . one MHZ is equivalent to one million cycles per
second.
Answer: ( √ )
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25.What do the words in bold print refer to ?
1. ……which executes program instructions and supervises…(line4)
Answer: microprocessor
2. …..the instruction that is currently being executed. ( line 23)
Answer: Instruction
3. …the amount of data – the number of bits – they can work with at a time (line 26)
Answer: microprocessors
4. ...... the microprocessor looks for it on …..(line 36).
Answer: An application.
5. …… its information is lost when the computer is turned off. (line 40)
Answer: RAM
6. ….expansion slots that allow users to install adapters or expansion boards.(line 45)
Answer: expansion slots.
26. Put in each sentences which , who
1. That's the CPU ……..I'd like to buy.
Answer: which
2. A co-processor is an extra processor chip …….does calculations at high speed.
Answer: which
3. The microprocessor coordinates the activities ….. take place in the computer system.
Answer: which
4. Last night I met someone …….works for GM as a computer programmer.
Answer: who
5. A palmtop is a computer …… is small enough to be held in the palm of one hand.
Answer: which
6. A megahertz is a unit of frequency ….. is used to measure processor speed.
Answer: which
7. Here's the DVD …… you lent me!
Answer: which
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27.Label this diagram with the correct terms.
Computer
System
Programs and data
Software
mechanical and electronic equipment
Hardware
Peripherals
Physical units attached to the computer
Main memory
CPU
The brain of the computer
Storage
devices
Input/output
devices
ROM
RAM
Optical
disk
Hard
disk
CD-R
DVD
CD-RW
CD-player
Floppy
disk
Keyboard
Mouse
Monitor
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