Electronics and Communication Engineering - Microprocessors

21. 

ALU 1C 74181 can accept two words each having

A. 2 bits
B. 4 bits
C. 8 bits
D. 16 bits

Answer: Option B

Explanation:

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22. 

Which of the following is not a legal subscript?

A. J + 2
B. JA - 4
C. -3
D. 3* IA - 2

Answer: Option C

Explanation:

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23. 

The instruction MOV M, r in 8085

A. causes content of register r to be moved to memory location whose address is in register H, L and uses register indirect addressing mode
B. causes the content of memory location whose address is in register H, L to move to register r and uses register indirect addressing mode
C. causes the content of register r to be moved to memory location whose address is in register H, L and uses immediate addressing mode
D. causes the content of memory location whose address is in register H, L to move to register r and uses immediate addressing mode

Answer: Option A

Explanation:

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24. 

Which of the following characters is allowed in variable names in C?

A. comma
B. dot
C. blank
D. underscore

Answer: Option D

Explanation:

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25. 

The standard FORTRAN exponential form of decimal number - 0.000000023 is

A. 2.3 E - 8
B. -2.3 E - 8
C. 2.3 E - 7
D. -2.3 E - 7

Answer: Option B

Explanation:

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