Free Test Scope and lifetime of ... – C Language

Q1: Which keyword is used to declare an automatic variable in C?

A. auto B. static C. extern D. register

Q2: What is the default storage class for local variables in C?

A. auto B. static C. register D. extern

Q3: Where are automatic variables stored?

A. Stack B. Heap C. Data segment D. Register

Q4: When is an automatic variable created?

A. At program start B. When the function is called C. When declared globally D. Never

Q5: What is the lifetime of an automatic variable?

A. Entire program execution B. Until the function ends C. Until manually deleted D. Infinite

Q6: Automatic variables have which type of scope?

A. Function scope B. Global scope C. Block scope D. File scope

Q7: By default, local variables are initialized to?

A. Zero B. Garbage value C. NULL D. One

Q8: If no storage class is specified for a local variable, it is?

A. static B. auto C. extern D. register

Q9: Which is true about automatic variables?

A. They are stored in heap B. They are stored in stack C. They persist after function exits D. They are initialized automatically

Q10: What happens to an automatic variable when a function ends?

A. It is destroyed B. It persists C. It is moved to heap D. It becomes static

Q11: Can an automatic variable be declared outside any function?

A. Yes B. No C. Only in main() D. Only with extern

Q12: Are auto variables thread-safe?

A. Yes B. No C. Only in single-threaded programs D. Only if static

Q13: Can auto keyword be omitted for local variables?

A. Yes B. No C. Only in C++ D. Only in global variables

Q14: Default initialization of an automatic int variable gives?

A. 0 B. Garbage value C. NULL D. Random constant

Q15: Where is the memory for automatic variables allocated?

A. Heap B. Stack C. Static data area D. Code segment

Q16: When are automatic variables destroyed?

A. At program termination B. At block exit C. At function entry D. At compile time

Q17: Which of the following is NOT true for automatic variables?

A. They are block-scoped B. They are stored in stack C. They persist between calls D. They have garbage initial value

Q18: What happens if you declare a variable as auto inside a loop?

A. It is created and destroyed every iteration B. It persists until program ends C. It acts as global variable D. It becomes register variable

Q19: Can an automatic variable be static at the same time?

A. Yes B. No C. Only in C++ D. Only in global scope

Q20: Automatic variables are created in which phase of program execution?

A. Compile time B. Runtime C. Linking time D. Optimization phase

Quiz for Scope and lifetime of variables auto