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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.

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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?

a.

Decoding low-level language instructions

b.

Eliminating useless detail

c.

Generating high-level language code

d.

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?

a.

To generate high-level language code

b.

To generate low-level language code

c.

To improve the quality of the decompiled output

d.

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.

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

b.

A decompiler works in reverse order compared to a compiler.

c.

A decompiler cannot generate high-level language code.

d.

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?

a.

to provide a higher-level view of the program

b.

to eliminate low-level detail from the code

c.

to translate low-level instructions into a generic instruction set

d.

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?

a.

Intermediate representations have an infinite number of registers available

b.

Intermediate representations use expression trees as operands

c.

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

d.

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?

a.

Yes

b.

No

c.

May be Yes or No

d.

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.

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

b.

A set of processor-specific instructions used in decompilation

c.

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

d.

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?

a.

Because they use complex expressions in almost every instruction

b.

Because they are designed to represent only high-level code

c.

Because they are designed to represent only low-level code

d.

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?

a.

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

b.

An instruction that represents a call to a subroutine

c.

An instruction that represents a return from a subroutine

d.

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?

a.

To push a value onto the stack

b.

To pop a value from the stack

c.

To call a subroutine

d.

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

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