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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 26 of 30

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Q251.
Why do interpreted programs run slower than compiled programs?

a.

Interpreters manage memory allocation and deallocation

b.

Interpreters have limited compatibility with different operating systems

c.

Interpreters must translate each bytecode instruction into multiple instructions on the physical CPU

d.

Interpreters have limited access to the host CPU's registers

Discuss
Answer: (c).Interpreters must translate each bytecode instruction into multiple instructions on the physical CPU Explanation:The reason why interpreted programs run slower than compiled programs is that interpreters must translate each bytecode instruction into multiple instructions on the physical CPU, which results in significant overhead and reduced performance.
Q252.
What is the major drawback of interpreters?

a.

They can execute bytecode directly on the host processor, resulting in slow performance.

b.

They must translate each bytecode instruction into dozens of instructions on the physical CPU.

c.

They are unable to manage the data accessed by the bytecode program.

d.

They must separately decode and execute each instruction, resulting in slow performance.

Discuss
Answer: (d).They must separately decode and execute each instruction, resulting in slow performance. Explanation:The major drawback of interpreters is performance. Because each instruction is separately decoded and executed by a program running under the real CPU, the program ends up running significantly slower than it would if it were running directly on the host's CPU. The interpreter must carry out a lot of work to execute a single high-level bytecode instruction, which means that interpreted programs run orders of magnitude slower than their compiled counterparts.
Q253.
What are just-in-time compilers?

a.

Programs that read a program's bytecode executable and execute it in a virtual environment implemented in software.

b.

Programs that translate high-level bytecode instructions into dozens of instructions on the physical CPU.

c.

Programs that take snippets of program bytecode at runtime and compile them into the native processor's machine language before running them.

d.

Programs that execute bytecode directly on the host processor.

Discuss
Answer: (c).Programs that take snippets of program bytecode at runtime and compile them into the native processor's machine language before running them. Explanation:Just-in-time compilers (JITs) are an alternative approach for running bytecode programs without the performance penalty associated with interpreters. The idea is to take snippets of program bytecode at runtime and compile them into the native processor's machine language before running them. These snippets are then executed natively on the host's CPU, which results in faster performance compared to running the bytecode through an interpreter.
Q254.
What is metadata?

a.

Information on classes, function parameters, local variable types, and much more contained in Microsoft .NET executables.

b.

Low-level language that is just like a hardware processor's assembly language.

c.

Highly detailed data type information that enables virtual machines to monitor and control any operations performed by the program.

d.

A feature found only on real silicon processors.

Discuss
Answer: (a).Information on classes, function parameters, local variable types, and much more contained in Microsoft .NET executables. Explanation:Metadata is highly detailed data type information contained in Microsoft .NET executables. It provides information on classes, function parameters, local variable types, and much more. This information makes reversing bytecode programs a different experience compared to reversing conventional, native executable programs.
Q255.
What is a Just-in-Time Compiler (JiT)?

a.

A program that reads a program's bytecode executable and executes it in a virtual environment implemented in software.

b.

A program that compiles bytecode into the native processor's machine language.

c.

A program that obfuscates sensitive information from bytecode executables.

d.

A program that reconstructs high-level language representations from bytecode executables on demand.

Discuss
Answer: (b).A program that compiles bytecode into the native processor's machine language. Explanation:A Just-in-Time Compiler (JiT) is a program that compiles bytecode into the native processor's machine language.
Q256.
What is an obfuscator?

a.

A program that reads a program's bytecode executable and executes it in a virtual environment implemented in software.

b.

A program that compiles bytecode into the native processor's machine language.

c.

A program that obfuscates sensitive information from bytecode executables.

d.

A program that reconstructs high-level language representations from bytecode executables on demand.

Discuss
Answer: (c).A program that obfuscates sensitive information from bytecode executables. Explanation:An obfuscator is a program that obfuscates sensitive information from bytecode executables.
Q257.
How was a microprocessor controlled in the early days?

a.

Using machine code read from memory

b.

Using parallelism techniques

c.

Using digital circuits

d.

Using a variety of operations

Discuss
Answer: (a).Using machine code read from memory Explanation:A microprocessor was controlled using machine code that was read from memory.
Q258.
What was the processor's runtime in the early days of microprocessors?

a.

Endlessly repeating sequence of reading an instruction from memory, decoding it, and triggering the correct circuit to perform the operation specified in the machine code

b.

Controlled using digital circuits

c.

Series of interdependent instructions

d.

Executing two or more instructions at the same time

Discuss
Answer: (a).Endlessly repeating sequence of reading an instruction from memory, decoding it, and triggering the correct circuit to perform the operation specified in the machine code Explanation:The processor's runtime in the early days of microprocessors consisted simply of an endlessly repeating sequence of reading an instruction from memory, decoding it, and triggering the correct circuit to perform the operation specified in the machine code.
Q259.
Why were microprocessor designers forced to introduce parallelism?

a.

To achieve backward compatibility

b.

To make code more efficient

c.

To improve instruction throughput

d.

To support interdependent instructions

Discuss
Answer: (c).To improve instruction throughput Explanation:Microprocessor designers were forced to introduce parallelism using a variety of techniques in order to meet the demand for faster and more flexible microprocessors.
Q260.
What is the problem with achieving parallelism in modern processors?

a.

Backward compatibility issues

b.

Limited support for parallel execution

c.

Interdependent sequential instructions

d.

Lack of optimization techniques

Discuss
Answer: (c).Interdependent sequential instructions Explanation:Because instructions were designed to run one after the other and not in any other way, sequential instructions often have interdependencies which prevent parallelism.
Page 26 of 30

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