Computer Organization MCQ set number 00079

1. RTN stands for _____
a) Register Transfer Notation
b) Register Transmission Notation
c) Regular Transmission Notation
d) Regular Transfer Notation

Answer

Answer:a [Reason:] This is the way of writing the assembly language code with the help of register notations.

2. The instruction, Add Loc,R1 in RTN is _______
a) AddSetCC Loc+R1
b) R1=Loc+R1
c) Not possible to write in RTN
d) R1<-[Loc]+[R1].

Answer

Answer:d [Reason:] None.

3. Can you perform addition on three operands simultaneously in ALN using Add instruction ?
a) Yes
b) Not possible using Add, we’ve to use AddSetCC
c) Not permitted
d) None of the mentioned

Answer

Answer:c [Reason:] You cannot perform addition on three operands simultaneously because the third operand is where the result is stored.

4. The instruction, Add R1,R2,R3 in RTN is _______
a) R3=R1+R2+R3
b) R3<-[R1]+[R2]+[R3].
c) R3=[R1]+[R2].
d) R3<-[R1]+[R2].

Answer

Answer:d [Reason:] In RTN the first operand is the destination and the second operand is the source.

5. In a system, which has 32 registers the register id is ____ long.
a) 16 bit
b) 8 bits
c) 5 bits
d) 6 bits

Answer

Answer:c [Reason:] The ID is the name tag given to each of the registers and used to identify them.

6. The two phases of executing an instruction are ____
a) Instruction decoding and storage
b) Instruction fetch and instruction execution
c) Instruction execution and storage
d) Instruction fetch and Instruction processing

Answer

Answer:b [Reason:] First, the instructions are fetched and decoded and then they’re executed and stored.

7. The Instruction fetch phase ends with ___
a) Placing the data from the address in MAR into MDR
b) Placing the address of the data into MAR
c) Completing the execution of the data and placing its storage address into MAR
d) Decoding the data in MDR and placing it in IR

Answer

Answer:d [Reason:] The fetch ends with the instruction getting decoded and being placed in the IR and the PC getting incremented.

8. While using the iterative construct (Branching) in execution ____ instruction is used to check the condition.
a) TestAndSet
b) Branch
c) TestCondn
d) None of the mentioned

Answer

Answer:b [Reason:] Branch instruction is used to check the test condition and to perform the memory jump with help of offset.

9. When using Branching, the usual sequencing of the PC is altered. A new instruction is loaded which is called as ______
a) Branch target
b) Loop target
c) Forward target
d) Jump instruction

Answer

Answer:a [Reason:] None.

10. The condition flag Z is set to 1 to indicate _______
a) The operation has resulted in an error
b) The operation requires an interrupt call
c) The result is zero
d) There is no empty register available

Answer

Answer:c [Reason:] This condition flag is used to check if the arithmetic operation yields a zero output.