Electronics and Communication Engineering - Microprocessors

26. 

Consider the following program for 8085

MOV A, D
RAL
MOV D, A

If initial contents of register D is decimal number 20, the final content of register D is

A. decimal 20
B. decimal 40
C. decimal 10
D. none of the above

Answer: Option B

Explanation:

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27. 

Assertion (A): In C a variable name can have upto 8 characters and special symbols can also be part of variable name.

Reason (R): In C a type declaration at the beginning of program indicates the type of variable name used in the program.

A. Both A and R are correct and R is correct explanation of A
B. Both A and R are correct but R is not correct explanation of A
C. A is correct R is wrong
D. A is wrong R is correct

Answer: Option D

Explanation:

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28. 

A string constant in basic is

A. a string of capital alphabets A to Z, included in question mark
B. a string of capital alphabets A to Z and digits 0 to 9 included in question mark
C. a string of capital alphabets A to Z, digits 0 to 9 and special characters
D. a string of capital alphabets A to Z, digits 0 to 9 and special characters included in question mark

Answer: Option D

Explanation:

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29. 

Assertion (A): In 8085 when RESET OUT goes low processing begins.

Reason (R): CPU remains reset till RESET IN signal goes high.

A. Both A and R are correct and R is correct explanation of A
B. Both A and R are correct but R is not correct explanation of A
C. A is correct R is wrong
D. A is wrong R is correct

Answer: Option B

Explanation:

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30. 

In microprocessor 8088

A. 8 data bits are multiplexed with 8 least significant bits of address bus
B. 8 data bits are multiplexed with 8 most significant bits of address bus
C. 16 data bits are multiplexed with 16 bits of address bus
D. none of the above

Answer: Option A

Explanation:

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