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Welcome to the Low Level Software MCQs Page

Dive deep into the fascinating world of Low Level Software with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Low Level Software, a crucial aspect of Reverse Engineering. In this section, you will encounter a diverse range of MCQs that cover various aspects of Low Level Software, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within Reverse Engineering.

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Check out the MCQs below to embark on an enriching journey through Low Level Software. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of Reverse Engineering.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of Low Level Software. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

Low Level Software MCQs | Page 18 of 30

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Q171.
What is the instruction used to compare operands in IA-32?

a.

ADD

b.

SUB

c.

MUL

d.

CMP

Discuss
Answer: (d).CMP Explanation:The instruction used to compare operands in IA-32 is CMP.
Q172.
How many operands does the CMP instruction take?

a.

One

b.

Two

c.

Three

d.

Four

Discuss
Answer: (b).Two Explanation:The CMP instruction takes two operands.
Q173.
What is the purpose of the CMP instruction in IA-32?

a.

To add two operands

b.

To subtract two operands

c.

To compare two operands and set flags based on the result

d.

To multiply two operands

Discuss
Answer: (c).To compare two operands and set flags based on the result Explanation:The purpose of the CMP instruction in IA-32 is to compare two operands and set flags based on the result.
Q174.
What flag is set by CMP if the result of the subtraction is zero?

a.

Zero Flag (ZF)

b.

Carry Flag (CF)

c.

Sign Flag (SF)

d.

Overflow Flag (OF)

Discuss
Answer: (a).Zero Flag (ZF) Explanation:If the result of the subtraction in CMP is zero, the Zero Flag (ZF) is set.
Q175.
What is the name of the group of instructions used to implement conditional branches in IA-32?

a.

CMP

b.

Jcc

c.

MOV

d.

ADD

Discuss
Answer: (b).Jcc Explanation:The group of instructions used to implement conditional branches in IA-32 is called Jcc.
Q176.
What happens if the specified condition in a Jcc instruction is not satisfied?

a.

The instruction pointer is updated to point to the next instruction

b.

The instruction pointer is updated to point to the specified code address

c.

The instruction is skipped and execution proceeds to the next instruction

d.

The instruction is executed regardless of the specified condition

Discuss
Answer: (a).The instruction pointer is updated to point to the next instruction Explanation:If the specified condition in a Jcc instruction is not satisfied, the instruction does nothing and execution proceeds to the next instruction.
Q177.
How many memory operands can an IA-32 instruction take?

a.

Only one

b.

Only two

c.

Any number

d.

None

Discuss
Answer: (a).Only one Explanation:An IA-32 instruction can only take one memory operand, with a few exceptions.
Q178.
What are the two basic instructions used in assembly language for function calls?

a.

ADD and SUB

b.

CALL and JMP

c.

PUSH and POP

d.

MOV and XOR

Discuss
Answer: (b).CALL and JMP Explanation:Function calls are implemented using two basic instructions in assembly language - CALL and RET.
Q179.
Which instruction pushes the current instruction pointer onto the stack in assembly language?

a.

RET

b.

CALL

c.

JMP

d.

Jcc

Discuss
Answer: (b).CALL Explanation:The CALL instruction pushes the current instruction pointer onto the stack (so that it is later possible to return to the caller) and jumps to the specified address.
Q180.
What does the RET instruction do in assembly language?

a.

Calls a function

b.

Jumps to a specified address

c.

Pops the instruction pointer pushed to the stack by CALL and resumes execution from that address

d.

Increments ESP by the specified number of bytes after popping the instruction pointer

Discuss
Answer: (c).Pops the instruction pointer pushed to the stack by CALL and resumes execution from that address Explanation:RET pops the instruction pointer pushed to the stack by CALL and resumes execution from that address.
Page 18 of 30

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