Quiz 12

Question 1

What is a dangling reference in programming?
A variable pointing to a memory location that has been deallocated or is no longer valid
A variable that points to a null memory address
A reference that points to a null memory address
A pointer that always points to a constant memory location

Answer 1

A variable pointing to a memory location that has been deallocated or is no longer valid

Question 2

Which of the following functions in C is used for dynamic memory location?
printf
malloc
static
sizeof

Answer 2

malloc

Question 3

What is a potential risk of aliasing?
Increased memory usage
Performance degradation due to redundant copies
Errors caused by uninitialized variables
Unintended side effects when modifying one alias

Answer 3

Unintended side effects when modifying one alias

Question 4

How is a constant different from a variable?
A constant can be reassigned during execution
A constant requires dynamic memory allocation
A constant does not have a type attribute
A constant does not have a location attribute

Answer 4

A constant does not have a location attribute

Question 5

Which of the following types of variables typically has the longest lifetime?
Variables declared inside loops
Global variables
Function parameters
Local variables in a function

Answer 5

Global variables

Question 6

Which type of assignment is typically used in Python for mutable objects like lists and dictionaries?
Assignment by pointer
Assignment by value
Assignment by cloning
Assignment by sharing

Answer 6

Assignment by sharing

Question 7

What is the main purpose of garbage collection in memory management?
To deallocate memory no longer in use, preventing memory leaks
To manage static variables at compile time
To allocate memory for program variables
To optimize cache usage during program execution

Answer 7

To deallocate memory no longer in use, preventing memory leaks

Question 8

What is the “environment” in programming?
The physical memory where the program runs
The hardware on which the program executes
A set of bindings that associates variables with their values or funcitons
The collection of syntax rules in a programming language

Answer 8

A set of bindings that associates variables with their values or functions

Question 9

What does a “lifetime” of a variable refer to?
The size of the variables in memory
The duration of its allocation in the environment
The number of times a variable is referenced in a program
The duration of the program’s execution

Answer 9

The duration of its allocation in the environment

Question 10

Which programming language primarily emphasizes value semantics?
JavaScript for objects and arrays
C++ when using primitive types
Python for all data types
Java for all objects

Answer 10

C++ when using primitive types