Computers MCQs : This section focuses on the "Computers". These Multiple Choice Questions (MCQs) should be practiced to improve the Computers skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
Question 1
Polled I/O works best when ________.
A. there are no priority considerations
B. priority considerations are frequent
C. the polling rate exceeds 1000 s
D. the polling rate is below 1000 s
Question 2
Which bus is bidirectional?
A. Address bus
B. Control bus
C. Data bus
D. None of the above
Question 3
Which of the following is not a computer functional block?
A. Analog-to-digital converter
B. Central-processing unit
C. Memory
D. Input/output ports
Question 4
Which of the following is not a computer bus?
A. Data bus
B. Control bus
C. Timer bus
D. Address bus
Question 5
With interrupt-driven I/O, if two or more devices request service at the same time, ________.
A. the device closest to the CPU gets priority
B. the device that is fastest gets priority
C. the device assigned the highest priority is serviced first
D. the system is likely to crash
Question 6
Which of the following is not a basic element within the microprocessor?
A. Microcontroller
B. Arithmetic logic unit (ALU)
C. Register array
D. Control unit
Question 7
During a read operation the CPU fetches ________.
A. a program instruction
B. another address
C. data itself
D. all of the above
Question 8
The process of jointly establishing communication is called ________.
A. DMA
B. bidirectional addressing
C. multiplexing
D. handshaking
Question 9
Which of the following is not an arithmetic instruction?
A. INC (increment)
B. CMP (compare)
C. DEC (decrement)
D. ROL (rotate left)
Question 10
The first Intel microprocessor to contain on-board cache memory was the ________.
A. 80386
B. 80486
C. Pentium
D. Pentium Pro
Question 11
Which microprocessor has multiplexed data and address lines?
A. 8086/8088
B. 80286
C. 80386
D. Pentium
Question 12
Which of the following is not an enhancement to the Pentium that was unavailable in the 8086/8088?
A. "Pipelined" architecture
B. Expansion of cache memory
C. Inclusion of an internal math coprocessor
D. Data/address line multiplexing
Question 13
Which is not an operand?
A. Variable
B. Register
C. Memory location
D. Assembler
Question 14
Which of the following is not an 8086/8088 general-purpose register?
A. Code segment (CS)
B. Data segment (DS)
C. Stack segment (SS)
D. Address segment (AS)
Question 15
Which method bypasses the CPU for certain types of data transfer?
A. Software interrupts
B. Interrupt-driven I/O
C. Polled I/O
D. Direct memory access (DMA)
Question 16
A 20-bit address bus can locate ________.
A. 1,048,576 locations
B. 2,097,152 locations
C. 4,194,304 locations
D. 8,388,608 locations
Question 17
The first microprocessor had a(n)________.
A. 1-bit data bus
B. 2-bit data bus
C. 4-bit data bus
D. 8-bit data bus
Question 18
Which is not part of the execution unit (EU)?
A. Arithmetic logic unit (ALU)
B. Clock
C. General registers
D. Flags
Question 19
DMA is particularly suited for data transfer between the ________.
A. disk drive and CPU
B. disk drive and RAM
C. disk drive and ROM
D. disk drive and I/O
Question 20
The Pentium microprocessor has a data bus of ________.
A. 16 bits
B. 32 bits
C. 64 bits
D. 128 bits
Question 21
A port can be ________.
A. strictly for input
B. strictly for output
C. bidirectional
D. all of the above
Question 22
Which of the following was not a design improvement for the 8086/8088 over the 8085?
A. Execution unit (EU)
B. 16-bit data bus
C. Arithmetic logic unit (ALU)
D. Bus interface unit (BIU)
Question 23
The Pentium can address ________.
A. 1 MB
B. 1 GB
C. 2 GB
D. 4 GB
Question 24
Which of the following is not a jump instruction?
A. JB (jump back)
B. JA (jump above)
C. JO (jump if overflow)
D. JMP (unconditional jump)
Question 25
What is occurring when two or more sources of data attempt to use the same bus?
A. Bus contention
B. Direct memory access
C. Bus interruption
D. PPI