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Microprocessors Interview
Quiz 1
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Q.1
The instruction, “INC” increases the contents of the specified register or memory location by
a) 2
b) 0
c) 1
d) 3
Q.2
The instruction that subtracts 1 from the contents of the specified register/memory location is
a) INC
b) SUBB
c) SUB
d) DEC
Q.3
The instruction that enables subtraction with borrow is
a) DEC
b) SUB
c) SBB
d) None of the mentioned
Q.4
The flag that acts as Borrow flag in the instruction, SBB is
a) direction flag
b) carry flag
c) parity flag
d) trap flag
Q.5
In general, the source operand of an instruction can be
a) memory location
b) register
c) immediate data
d) all of the mentioned
Q.6
In general, the destination operand of an instruction can be
a) memory location
b) register
c) immediate data
d) memory location and register
Q.7
The instruction, CMP to compare source and destination operands it performs
a) addition
b) subtraction
c) division
d) multiplication
Q.8
During comparison operation, the result of comparing or subtraction is stored in
a) memory
b) registers
c) stack
d) no where
Q.9
The instruction that converts the result in an unpacked decimal digits is
a) AAA
b) AAS
c) AAM
d) All of the mentioned
Q.10
Which of the following is a mnemonic?
a) ADD
b) ADC
c) AAA
d) ADD & ADC
Q.11
The instruction in which adjustment is made before performing the operation is
a) AAA
b) AAS
c) AAM
d) AAD
Q.12
The expansion of DAA is
a) decimal adjust after addition
b) decimal adjust before addition
c) decimal adjust accumulator
d) decimal adjust auxiliary
Q.13
The instruction that is used to convert the result of the addition of two packed BCD numbers to a valid BCD number is
a) DAA
b) DAS
c) AAA
d) AAS
Q.14
The ROR instruction rotates the contents of the destination operand to
a) left
b) right
c) left and then right
d) right and then left
0 h : 0 m : 1 s
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