# A Level Computer Science Quiz 2019 Part 1

#### Quiz Description

Computer science is too often defined by what it’s not. Students, teachers, and administrators frequently characterize computer science as a discipline dominated by people who stare at screens, mindlessly inputting reams of arcane code while others believe that mastering office applications or producing a webpage forms the core of computer science education.

But there is more to this particular subject than meets the eye such as writing a program using an algorithm, knowing how to break a task down into its essential steps.They must lay a foundation about the understanding of this subject. To help students at the advanced level going in for the CGCE better understand this subject, a quiz of 15 questions has been made available. The quiz is based on the Advanced level syllabus. This quiz is here to honed your understanding about this subjectJust like the questions you have answered, we have provided many resourceful materials on our website.

The number 23.25 translated into normalized floating number, with a 10-bit mantissa and a 6-bit exponent.

Correct
• 0110110000 000101
• 0101110000 000001
• 0101110100 000101
• 0000010111 000100

Two registers involved in the fetch-execute cycle are:

Correct
• The program counter and the stack pointer
• The Accumulator and the program counter
• The accumulator and the current instruction register
• The memory address register and the memory data register

The NAND gate has inputs A and B. Its output is connected to both inputs of another NAND gate. An equivalent gate for these two NAND gates is a(n):

Correct
• OR gate
• AND gate
• NOR gate
• XOR gate

The Octal equivalent of the hexadecimal code F3A1 is:

Correct
• 173101
• 171641
• 176451
• 178661

The address bus of a certain computer has 8 lines. What is the maximum number of addressable memory cells?

Correct
• 265
• 256
• 252
• 255

Decimal equivalent of the binary number 101001.1011 is:

Correct
• 41.7875
• 41.5875
• 41.6875
• 41.1875

In register addressing mode operands are examined in:

Correct
• Cache memory
• Secondary storage
• The CPU
• Primary storage

In an instruction where the address part points to the address of actual data, the addressing mode is:

Correct

On receiving an interrupt, the CPU:

Correct
• Finishes executing to the interrupt service routine
• Immediately moves to the interrupt service routine without completing current instruction
• Releases the control on I/O lines and memory lines
• Makes any peripheral device that requested the interrupt to wait for a fixed interval of time

A CPU has a 16-bit program counter. This means that the CPU can address:

Correct
• 16K memory locations
• 32K memory locations
• 64K memory locations
• 256K memory locations

Which of the following sources of interrupt has the highest priority?

Correct
• Division by zero
• Real-time clock
• Memory parity error
• Keyboard key pressed

The concept of pipelining is most effective in improving performance if the tasks being performed in different stages:

Correct
• Requires different amount of time
• Require about the same amount of time
• Require different amount of time with time difference between any two tasks being same
• Require different amount with time difference between any two tasks being different

A microprocessor has a data bus with 64 lines and an address bus with 32 lines. The maximum number of bits that can be stored in memory is:

Correct
• 32 x 2^32
• 32 x 2^64
• 64 x 2^32
• 64 x 2^64

The simplified form of the expression AB+ABC is:

Correct
• AB
• A(B+C)
• AB+AC
• ABC

The virtual memory of a computer system may be:

Correct
• Of unlimited size
• As big as the maximum addressing capability of the computer system
• Of size equivalent to the total capacity of secondary storage plus that of RAM
• None of the above