Unit-3: Central Processing Unit  (20 MCQs)

11th Class Computer Science MCQs Preparation 

National Book Foundation
as
Federal Text Boards, Islamabad, Pakistan

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1. Which part of the computer performs the fetch, decode, and execute cycle?




... Answer is B. Control Unit
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2. Where are the results of ALU operations transferred?




... Answer is D. Accumulator Register
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3. Which of these buses selects a memory word for a read or write operation?




... Answer is C. Address Bus
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4. Which of these registers controls the sequence in which instructions are fetched from memory for execution?




... Answer is A. Program Counter
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5.  A memory word that is to be stored in or fetched from memory must first be transferred into which register?




... Answer is C. Memory Buffer Register
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6. Which instruction causes the transfer of instruction execution to the specified address?




... Answer is B. Branch
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7. Which of these instructions will perform the addition of two numbers? :




... Answer is A. Operation
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8. Through which bus, instructions are transferred from the main memory to the instruction register?




... Answer is D. Instruction Bus
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9. How many distinct operations can be performed if the op-code of a microprocessor consists of bits?




... Answer is C. 16
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10. Which part of the computer decodes instructions?




... Answer is D. Control Unit
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11. Processor includes all of the following except




... Answer is B. RAM
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12. _______ coordinates the activities of all hardware.




... Answer is B. CU
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13. ________ holds the data coming from or going to memory.



... Answer is D. MBR
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14.  ________ is not a data transfer instruction.



... Answer is C. ADD
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15. Which of the following is an example of zero-address instruction.




... Answer is A. STOP
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16.. Which of the following processors has a clock speed of 1.7 GHz?




... Answer is A. P-IV
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17. Intel and AMD are manufacturers of __________________ :



... Answer is B. Processor
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18. In __________ step reads a new instruction from memory




... Answer is A. Fetch
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19. What does the data bus carry?




... Answer is C. Data and instructions
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20. A set of bits that tells the computer to perform a specific operation is called__________ :




... Answer is A. Instruction code
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Unit 1, Unit 2, 

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