Welcome to the Decompilation MCQs Page

Dive deep into the fascinating world of Decompilation with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Decompilation, a crucial aspect of Reverse Engineering. In this section, you will encounter a diverse range of MCQs that cover various aspects of Decompilation, 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.

Check out the MCQs below to embark on an enriching journey through Decompilation. 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 Decompilation. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

Decompilation MCQs | Page 2 of 11

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Q11.

What is the back end of a decompiler responsible for?

Decoding low-level language instructions

Eliminating useless detail

Generating high-level language code

Improving the quality of the decompiled output

Discuss

Answer: (c).Generating high-level language code Explanation:The back end of a decompiler takes the improved intermediate representation and uses it to produce a high-level language representation of the program.

Q12.

What is the purpose of improving the intermediate representation of the program?

To generate high-level language code

To generate low-level language code

To improve the quality of the decompiled output

To eliminate as much useful detail as possible

Discuss

Answer: (c).To improve the quality of the decompiled output Explanation:The intermediate representation is gradually improved by eliminating as much useless detail as possible, while emphasizing valuable details as they are gathered in order to improve the quality of the decompiled output.

Q13.

What is the key difference between a decompiler and a compiler?

A decompiler generates low-level language code, while a compiler generates high-level language code.

A decompiler works in reverse order compared to a compiler.

A decompiler cannot generate high-level language code.

A compiler eliminates useless detail, while a decompiler emphasizes valuable detail.

Discuss

Answer: (b).A decompiler works in reverse order compared to a compiler. Explanation:A decompiler works in reverse order compared to a compiler, taking low-level language code and generating high-level language code, while a compiler takes high-level language code and generates low-level language code.

Q14.

What is the purpose of an intermediate representation in decompilation?

to provide a higher-level view of the program

to eliminate low-level detail from the code

to translate low-level instructions into a generic instruction set

all of the above

Discuss

Answer: (d).all of the above Explanation:The intermediate representation in decompilation serves multiple purposes such as providing a higher-level view of the program, eliminating low-level detail from the code, and translating low-level instructions into a generic instruction set.

Q15.

How are intermediate representations different from typical low-level instruction sets?

Intermediate representations have an infinite number of registers available

Intermediate representations use expression trees as operands

Intermediate representations can describe complex arithmetic or logical expressions in a single instruction

All of the above

Discuss

Answer: (d).All of the above Explanation:Intermediate representations are different from typical low-level instruction sets in that they have an infinite number of registers available, use expression trees as operands, and can describe complex arithmetic or logical expressions in a single instruction.

Q16.

Do all decompilers use a single intermediate representation for the entire process?

Yes

May be Yes or No

Can't say

Discuss

Answer: (b).No Explanation:Some decompilers, such as dcc, have more than one intermediate representation, while others use a single representation for the entire process.

Q17.

What are intermediate representations in decompilation?

A set of generic instructions that can represent low-level code and high-level code

A set of processor-specific instructions used in decompilation

A set of instructions used to encode low-level code only

A set of instructions used to encode high-level code only

Discuss

Answer: (a).A set of generic instructions that can represent low-level code and high-level code Explanation:Intermediate representations are generic instruction sets that can represent both low-level and high-level code.

Q18.

Why do intermediate representations typically have a small instruction set?

Because they use complex expressions in almost every instruction

Because they are designed to represent only high-level code

Because they are designed to represent only low-level code

Because they are processor-specific and need to be small to be efficient

Discuss

Answer: (a).Because they use complex expressions in almost every instruction Explanation:Complex expressions used in almost every instruction allow for a small instruction set.

Q19.

What is an assignment instruction in decompilation?

An instruction that represents an assignment operation into a register, variable, or other memory location

An instruction that represents a call to a subroutine

An instruction that represents a return from a subroutine

An instruction that represents pushing a value onto the stack

Discuss

Answer: (a).An instruction that represents an assignment operation into a register, variable, or other memory location Explanation:An assignment instruction represents an assignment operation into a register, variable, or other memory location.

Q20.

What is the purpose of the Push instruction in decompilation?

To push a value onto the stack

To pop a value from the stack

To call a subroutine

To return from a subroutine

Discuss

Answer: (a).To push a value onto the stack Explanation:The Push instruction is used to push a value onto the stack.

Page 2 of 11

Low Level Software 🔒

Windows Fundamentals 🔒

Reversing Tools 🔒

Auditing Program Binaries 🔒

Reversing Malware 🔒

Antireversing Techniques 🔒

Breaking Protections 🔒

Reversing .NET 🔒

Deciphering Code Structures 🔒

Deciphering Program Data 🔒

Welcome to the Decompilation MCQs Page

Decompilation MCQs | Page 2 of 11

Explore more Topics under Reverse Engineering

Introduction to Reverse Engineering

Beyond the Documentation

Deciphering File Formats

Piracy and Copy Protection

Understanding Compiled Arithmetic

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