Advanced level 2023 south west regional mock computer science 1
Advanced level 2023 south west regional mock computer science 1
Orock uses his computer to produce an access
badge using his twin brother’s personal
information, which he uses to gain access to his
brother’s office without latter’s permission. This act
by Orock is known as:
A scamming
B falsification
C identity theft
D forgery
7. When implementing a full-adder circuit using tw’o
half- adders, the carry outputs of both half-adders
are passed as inputs to a certain logic gale. Which
of the following gates corresponds to the logic gate
in question?
A AND gale
B OR gate
C XOR gate
D NOT gate
8. What is the 2’s complement of the binary number
0011 0101 1001 1100?
A 1100 1010 1100 1011.
B 1100 1010 0110 0011.
C 1100 10100110 0100.
D iioo ioio mi mi.
2. The three main goals of computer security are:
A detection, response and correction.
B confidentiality, integrity and availability.
C detection, protection and access control.
B identification, authentication and encryption.
3. Two registers involved in the fetch part of the
fetch-execute cycle are:
A the Program Counter and the Stack pointer
B the Accumulator and the Program Counter
C the Accumulator and the Current Instruction
Register
D the Memory Address Register and the Memory
Data Register
9. How many RAM chips each of capacity 512K by 8
are required to build a 4M by 32 main memory?
A 32
B 16
C 8
D 64
10.The expression NOT(y < 5 AND x # 4 ) will always
evaluate to TRUE when:
A y – 5 AND x > 4
B y > 5 AND x < 4
C y >= 5 OR x # 4
D y > 5 OR x = 4
4. Most modern computer systems have three levels of
cache memory. The purpose of cache memory in
the computer is to:
A help extend the capacity of the computer’s main
memory
B help bridge the speed difference between CPU
registers and primary memory
C act as buffer between an application and the data
sent to the printer
D improve the multitasking capability of the computer
11.Which of the following bitwise Boolean functions
can be used to find the two s complement of a
number?
A Bitwise OR
B Bitwise NOT
C Bitwise AND
D Bitwise XOR
5. A technique to make programs faster by
overlapping the execution of the steps of successive
instructions is known as:
A Multitasking
B Multiprocessing
C Vector processing
D Pipeline processing
12.In an operating system like Microsoft Windows,
which of the following provides a means of
communication between an executing program and
the operating system?
A Scheduler
B System calls
C Command Line Interface
D Graphical User Interface
6. An OR gate has 6 inputs. What is the only input
word that produces a 0 output ?
A 000000
B 000111
C 111000
D 111111
