1. Where does the MDR send its contents if it contains data? A. general purpose register B. PC C. IR D. MAR

2.How many gates does ALU have ? A.0 B.1 C.2 D.3

3.How many Gates does Register Y Have? A.0 B.1 C.2 D.3

4.How many gates does register Z have? A. 0 B. 1 C. 2 D. 3

5.What should be the logic level to activate an output gate? A. 0 B. 1 C. both A and B D. neigther A nor B

6.What should be the logic level to activate an input gate? A. 0 B. 1 C. both A and B D. neigther A nor B

7.What gate should be activated to input data to register Rn? A. Rnin B. Rnout C. Rninput D. Rnoutput

8.Where does the ALU input B get its input from? A. PC B. MUX C. system bus D. Registers

9.What external bus is the MDR connected to? A. address bus B. data bus C. control bus D. bus

10.Where should the data be kept when the CPU is about to store a word of data into memory? A. MAR B. MDR C. register Rn D. PC

11.How many gates does the MAR have? A. 1 B. 2 C. 3 D. 4

12.Where should the CPU get its data when it just fetched a word from memory? A. MAR B. MDR C. register Rn D. PC

13.What control signal is sent by the memory device to inform the CPU that the memory operation is complete? A. MFC B. WMFC C. KFC D. UFC

14.In the instruction R2 <-- [R1] + [[R2]], which register is the destination operand? A. register Y B. register Z C. register R1 D. register R2

15.In the instruction R1 <-- [R1] + [[R2]], which register holds the memory location? A. register Y B. register z C. register R1 D. register R2

16.In the instruction R1 <-- [R1] + [[R2]], when does the WMFC instruction be issued? A. before memory access B. after memory access C. during memory access D. never

17.In the instruction R1 <-- [R1] + [[R2]], which register is the destination operand? A. register Y B. register z C. register R1 D. register R2

18.In the instruction R1 <-- [[R1]] + [R2], the PC is updated by how much? A. 0 B. 1 C. 2 D. 3

19.What control signal is sent to fetch a word of data from memory? A. Read B. Write C. Enable D. Disable

20.Where does the MDR send its contents if it contains an instruction? A. general purpose register B. PC C. IR D. MAR