C Programming & Assembly Language Nptel Week 1 Answers
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C Programming & Assembly Language Nptel Week 1 Answers (July-Dec 2025)
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Question 1. What are the values of the registers AX and BX after the following assembly code executes?
MOV AX, 0x05
MOV BX, 0x02
SUB AX, BX
XOR BX,BX
ADD AX, BX
a) AX=0x05, BX=0x02
b) AX=0x03, BX=0x02
c) AX=0x05, BX=0x00
d) AX=0x03, BX=0x00
Question 2. Which of the following flags are set (value becomes 1) at any point in the following sequence of programs? (Assuming they are all unset initially)
MOV BX, 14
MOV AX, 3
MOV CX, AX
SUB AX, BX
ADD CX, 6
CMP BX, CX
a) Direction Flag
b) Overflow Flag
c) Sign Flag
d) Zero Flag
Question 3. For the following instructions: When MOV AL,01 is reached it is necessarily the case that CL= 0
a) True
b) False
Question 4. Find the value of DL (in decimal) after the following assembly instruction
MOV EAX, 0xFFFFFFFF
MOV EDX, 5
MOV ECX, 2
MUL ECX
a) 1
b) 2
c) 5
d) 10
Question 5. If the address of element 28 is 34 (in decimal), what is the value stored in EDI after executing the following code?
MOV AL, 28
MOV EDI, START_ADDR
MOV ECX, 8
CLD
REPNE SCASB
a) 34
b) 35
c) 36
d) 37
These are C Programming & Assembly Language Nptel Week 1 Answers
Question 6. Value of ECX upon completion of the code:
a) 0
b) 1
c) 2
d) 3
Question 7. Which of the following segments does the destination pointer point to?
a) Stack
b) Data
c) Code
d) Extra
Question 8. After the following snippet code executes, what will be the values in Array-1, Array-2?
Question 9. Which type of addressing is being done in the above question?
a) Register Direct
b) Indirect
c) Indirect with offset
d) None of the Above
Question 10. If in the above question, the value in EAX is given to be 0x38, the complete address accessed is (in hexadecimal without the 0x):
a) 1438
b) 01438
c) 14138
d) 014138
Question 11. Which of the following functions are performed by the RET N instruction (for the architecture used in this course)?
a) It increments N to the stack pointer
b) It decrements N from the stack pointer
c) It pops the top of stack into the EIP
d) It pushes the EIP to the top of the stack
These are C Programming & Assembly Language Nptel Week 1 Answers
Question 12. If EAX=0x2117, ECX=0x2434, ESS=0x1041 and ESP=0xF612. Analyse the following assembly code snippet. What is the value of ESP after the following code executes?
PUSH EAX
PUSH ECX
POP DWORD PTR [ECX]
ADD EAX, ECX
POP WORD PTR [ECX]
a) 0xF610
b) 0xF611
c) 0xF612
d) 0xF613
Question 13. Which of the following statements are true?
a) CMPS compares strings between the data and extra segments.
b) MOVSB copies data within the data segment.
c) PUSH operation places data in the extra segment.
d) POP operation removes data from the stack segment.
These are C Programming & Assembly Language Nptel Week 1 Answers
