Electronics and Communication Engineering - Digital Electronics

1. 

The logic operation that will selectively clear bits in register A in those positions where these are 1 's in the bits of register B is given by

A. A ← A + B
B. A ← AB
C. A ← A + B
D. A ← AB

Answer: Option D

Explanation:

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2. 

The 2's complement representation of the decimal number -4 is

A. 0100
B. 1100
C. 1011
D. 1010

Answer: Option B

Explanation:

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3. 

The following program starts at location 0100H
L X ISP, 00FF - the content if accumulator
LXIH, 0701 - when the program counter
MVI A, 20 H - reaches 0109 H is
S ∪ BM

A. 20 H
B. 02 H
C. 00 H
D. FFH

Answer: Option A

Explanation:

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4. 

In 8085 microprocessor, what is the length of PC (program counter)?

A. 6 bits
B. 8 bit
C. 12 bits
D. 16 bits

Answer: Option D

Explanation:

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5. 

In decimal system the base of radix is

A. 0
B. 1
C. 10
D. e

Answer: Option C

Explanation:

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