computer Architecture - chapter 2

The instruction, Add #45,R1 does _______

• a) Adds the value of 45 to the address of R1 and stores 45 in that address

• b) Adds 45 to the value of R1 and stores it in R1

• c) Finds the memory location 45 and adds that content to that of R1

• d) None of the mentioned

In the case of, Zero-address instruction method the operands are stored in _____

• a) Registers

• b) Accumulators

• c) Push down stack

• d) Cache

Add #45, when this instruction is executed the following happen/s _______

• a) The processor raises an error and requests for one more operand

• b) The value stored in memory location 45 is retrieved and one more operand is requested

• c) The value 45 gets added to the value on the stack and is pushed onto the stack

• d) None of the mentioned

The addressing mode which makes use of in-direction pointers is ______

• a) Indirect addressing mode

• b) Index addressing mode

• c) Relative addressing mode

• d) Offset addressing mode

In the following indexed addressing mode instruction, MOV 5(R1), LOC the effective address is ______

• a) EA = 5+R1

• b) EA = R1

• c) EA = [R1]

• d) EA = 5+[R1]

The addressing mode/s, which uses the PC instead of a general purpose register is ______

• a) Indexed with offset

• b) Relative

• c) Direct

• d) Both Indexed with offset and direct

When we use auto increment or auto decrement, which of the following is/are true?

1) In both, the address is used to retrieve the operand and then the address gets altered

2) In auto increment, the operand is retrieved first and then the address altered

3) Both of them can be used on general purpose registers as well as memory locations

• a) 1, 2, 3

• b) 2

• c) 1, 3

• d) 2, 3

The addressing mode, where you directly specify the operand value is _______

• a) Immediate

• b) Direct

• c) Definite

• d) Relative

The effective address of the following instruction is MUL 5(R1,R2).

• a) 5+R1+R2

• b) 5+(R1*R2)

• c) 5+[R1]+[R2]

• d) 5*([R1]+[R2])

_____ addressing mode is most suitable to change the normal sequence of execution of instructions.

• a) Relative

• b) Indirect

• c) Index with Offset

• d) Immediate