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COS1521 EXAM PACK 2025 {DETAILED QUESTIONS AND ANSWERS }
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- University Of South Africa
COS1521 EXAM PACK 2025 {DETAILED QUESTIONS AND ANSWERS }
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lOMoAR cPSD| 49343224, lOMoAR cPSD| 49343224
QUESTION 1
Which one of the following statements regarding an address space of memory is FALSE?
1. The total number of uniquely identifiable memory locations is referred to as the address space.
2. A memory address is represented as a bit pattern.
3. Data is transferred from and to the memory space in units called frames.
4. Memory addresses cannot be stored as signed integers.
QUESTION 2
Which one of the following types of ROM (read-only memory) can be user-programmed, and then also erased by
ultraviolet light?
1. EEPROM
2. EPROM
3. PROM
4. ROM
QUESTION 3
Which one of the following statements describes a property of RISC computer architecture?
1. Micromemory holds the set of operations for each complex instruction in the instruction set.
2. RISC is easier than other designs because there is a single instruction for both simple and complex tasks.
3. A small set of instructions does a minimum number of simple operations.
4. The circuitry of the CPU in a RISC design is very complicated.
QUESTION 4
Which one of the following statements is TRUE for the fetch cycle of the CPU during program execution?
1. The instruction in the instruction register is decoded by the fetch cycle.
2. The control unit orders the system to copy the next instruction into the instruction register during the fetch cycle.
3. The CPU executes commands such as ‘load a data item from memory’ during the fetch cycle.
4. The fetch cycle provides the binary code for the next operation to be performed.
QUESTION 5
Why is it easier to program CISC-based computers than to program other designs?
1. A small set of instructions will do a minimum number of simple operations.
2. CISC has a low overhead due to micro-processing.
3. There is a single instruction for both simple and complex tasks.
4. Programming is done on one level.
, lOMoAR cPSD| 49343224
QUESTION 6 Chap 6
Which one of the following statements is NOT true for the transport layer of the TCP/IP protocol?
1. The transport layer is located between the application layer and the data-link layer.
2. The transport layer provides services to the application layer.
3. The transport layer is a process-to-process connection.
4. The transport layer is considered the heart of the TCP/IP protocol.
QUESTION 7
Which one of the following statements is NOT true about the User Datagram Protocol (UDM)?
1. The UDM is connectionless.
2. The UDM is unreliable.
3. The UDM uses a minimum overhead.
4. The UDM is used by the network layer.
QUESTION 8
Which of the following statements is NOT true for the network layer of the TCP/IP protocol?
1. The network layer provides services to the transport layer.
2. The network layer carries the payload of data from source to destination without changing it. 3. If a
data packet gets fragmented along the way, the network layer sends the fragments as they arrive.
4. Data packets in the network layer can be lost, get corrupted or get duplicated.
QUESTION 9
Which one of the following is not a form of guided media?
1. Plastic cable
2. Twisted-pair cable
3. Coaxial cable
4. Fibre-optic cable
QUESTION 10
Which one of the following statements is NOT true for unguided media (wireless communication)?
1. Signals are broadcast through free space.
2. Radio waves with a frequency between 3 kHz and 1 GHz are used for radio communication.
3. Infrared waves with frequencies between 300 GHz and 400 THz are used for long-range communication.
4. Microwaves are unidirectional.
QUESTION 11 Chap 7
What name is given to the situation where computer programs are in memory at the same time and are executed
, lOMoAR cPSD| 49343224
1. Multiprocessing
2. Multiprogramming
3. Synchronised processing
4. Batch processing
QUESTION 12
Which one of the following is NOT one of the operating system’s components?
1. Memory manager
2. Hardware manager
3. File manager
4. Process manager
QUESTION 13
Which one of the following statements is NOT true about paging?
1. It improves the efficiency of partitioning.
2. In paging, memory is divided into frames and programs are divided into pages.
3. Each program page is loaded into a frame in memory.
4. Contiguous pages of programs must occupy contiguous frames in memory.
QUESTION 14
Which one of the following is not a necessary condition for deadlock to occur?
1. Mutual exclusion
2. Resource holding
3. Circular waiting
4. Starvation
QUESTION 15
An OS can be programmed in such way that the code is independent of the machine language of a computer on
which it runs. This property refers to the _____________ of the OS. 1. extensibility
2. reliability
3. compatibility
4. portability
QUESTION 16 Chap 8
A list contains the following elements:
18 25 31 47 51 57 61 66 70 79 81 85 93
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