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Which one of the following statement is correct?
- a)ROM is a Read/Write memory
- b)PC points to the last instruction that was executed.
- c)Stack works on the principal of LIFO
- d)All instructions affect the flags
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
Which one of the following statement is correct?a)ROM is a Read/Write ...
PC Points to the Last Instruction that was Executed
Heading: Explanation
The PC (Program Counter) is a register in the CPU (Central Processing Unit) that keeps track of the memory address of the next instruction to be executed. After an instruction is fetched and executed, the PC is automatically incremented to point to the next instruction in memory.
Therefore, the statement "PC points to the last instruction that was executed" is incorrect. Instead, the PC points to the memory address of the next instruction to be executed.
Heading: Correction
The correct statement is "PC points to the next instruction to be executed."
Heading: Other Options
a) ROM is a Read/Write memory: This statement is incorrect. ROM (Read-Only Memory) is a non-volatile memory that can only be read and not written to.
b) PC points to the last instruction that was executed: This statement is incorrect, as explained above.
c) Stack works on the principle of LIFO: This statement is correct. The stack is a data structure in computer memory that operates on the LIFO (Last-In-First-Out) principle, where the last item added to the stack is the first one to be removed.
d) All instructions affect the flags: This statement is incorrect. Not all instructions affect the flags in the CPU, but most arithmetic and logical instructions do. The flags are used to indicate the result of the operation, such as whether the result was zero, negative, or overflowed.
Heading: Explanation
The PC (Program Counter) is a register in the CPU (Central Processing Unit) that keeps track of the memory address of the next instruction to be executed. After an instruction is fetched and executed, the PC is automatically incremented to point to the next instruction in memory.
Therefore, the statement "PC points to the last instruction that was executed" is incorrect. Instead, the PC points to the memory address of the next instruction to be executed.
Heading: Correction
The correct statement is "PC points to the next instruction to be executed."
Heading: Other Options
a) ROM is a Read/Write memory: This statement is incorrect. ROM (Read-Only Memory) is a non-volatile memory that can only be read and not written to.
b) PC points to the last instruction that was executed: This statement is incorrect, as explained above.
c) Stack works on the principle of LIFO: This statement is correct. The stack is a data structure in computer memory that operates on the LIFO (Last-In-First-Out) principle, where the last item added to the stack is the first one to be removed.
d) All instructions affect the flags: This statement is incorrect. Not all instructions affect the flags in the CPU, but most arithmetic and logical instructions do. The flags are used to indicate the result of the operation, such as whether the result was zero, negative, or overflowed.
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Community Answer
Which one of the following statement is correct?a)ROM is a Read/Write ...
PC points to future or next instruction location not instructions that are already executed.
so right answer here is C.stack is last in-first out.
so right answer here is C.stack is last in-first out.
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Which one of the following statement is correct?a)ROM is a Read/Write memoryb)PC points to the last instruction that was executed.c)Stack works on the principal of LIFOd)All instructions affect the flagsCorrect answer is option 'B'. Can you explain this answer?
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