Advanced level 2024 South regional mock computer science 1
Advanced level 2024 South regional mock computer science 1
Use the following to answer questions 1, 2 & 3
Real numbers are stored in a computer system using
floating-point representation with: 10 bits for the
mantissa, 6 bits for the exponent & two’s
complement form for both the mantissa and the
exponent.
1. What is the normalized floating-point
representation of –7.25 in this system?
A. 0111010000 000011
B. 1000110000 000011
C. 1000101111 000011
D. None of the above
2. What is the denary value of the given binary
floating-point number 1011000111 000111?
A. 177.75
B. –177.75
C. –78.25
D. None of the above
3. The given binary floating-point number,
0000000111 100111, is not normalized. Which
of the following is a normalized format of this
number in this system?
A. 0111000000 000110
B. 0111000000 100001
C. 0111000000 100000
D. None of the above
4. What is the Boolean expression for the output X
of the logic circuit below?
A. ̅̅̅̅̅̅̅̅ ̅
B. ̅ ̅ ̅ ̅
C. ̅ ̅
D. ̅
5. A disk has two recordable sides, 18 tracks and
80 sectors per track. If each sector stores 512
bytes of data. The capacity of the disk in
megabytes and the minimum number of bits
required to specify a particular sector in the disk
are respectively?
A. 0.70 MB, 12 Bits
B. 1.41 MB, 12 Bits
C. 1440 MB, 2880 Bits
D. 0.70 MB, 2880 Bits
6. Which registers interface the processor with the
main memory?
A. Program counter and Accumulator
B. Memory address register and Memory data
register
C. Current instruction register and accumulator
D. Current instruction register and program
counter.
7. The following are three statements about the
“locality of reference” principle used in memory
systems:
I. It states that it is more likely that an
already accessed memory location is
accessed further and it is more likely that
surrounding (adjacent) memory
locations will also be accessed
II. It is an observation that is widely used to
implement virtual memory and cache
memory systems
III. It states that the bytes of a word be
interleaved on several physical memory
modules for better performance
Which of them is/are true?
A. Only I is true
B. Only II is true
C. Only III is true
D. Only I and II are true
8. Consider the following processor design
characteristics:
I: Register-to-register arithmetic
operations only II: Fixed-length instruction
format III: Hardwired control unit.
Which of the characteristics above are
used in the design of a RISC processor?
A. I and II only
B. II and III only
C. I and III only
D. I, II and III
9. For computers based on three-address
instruction formats, each address field can be
used to specify which of the following? S1: A
memory operand, S2: A processor register, S3:
An implied accumulator register
A. Either S1 or S2
B. Either S2 or S3
C. Only S2 and S3
D. All of S1, S2 and S3
