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Computers Online Exam Quiz

Important questions about Computers. Computers MCQ questions with answers. Computers exam questions and answers for students and interviews.

1. Which of the following is not an arithmetic instruction?

Options

A : INC (increment)

B : CMP (compare)

C : DEC (decrement)

D : ROL (rotate left)

2. Which is not an operand?

Options

A : Variable

B : Register

C : Memory location

D : Assembler

3. Which method bypasses the CPU for certain types of data transfer?

Options

A : Software interrupts

B : Interrupt-driven I/O

C : Polled I/O

D : Direct memory access (DMA)

4. During a read operation the CPU fetches ________.

Options

A : a program instruction

B : another address

C : data itself

D : all of the above

5. The Pentium microprocessor has a data bus of ________.

Options

A : 16 bits

B : 32 bits

C : 64 bits

D : 128 bits

6. The Pentium can address ________.

Options

A : 1 MB

B : 1 GB

C : 2 GB

D : 4 GB

7. A port can be ________.

Options

A : strictly for input

B : strictly for output

C : bidirectional

D : all of the above

8. The process of jointly establishing communication is called ________.

Options

A : DMA

B : bidirectional addressing

C : multiplexing

D : handshaking

9. With interrupt-driven I/O, if two or more devices request service at the same time, ________.

Options

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

10. The first microprocessor had a(n)________.

Options

A : 1-bit data bus

B : 2-bit data bus

C : 4-bit data bus

D : 8-bit data bus

2. Which of the following is not a computer functional block?

Options

A : Analog-to-digital converter

B : Central-processing unit

C : Memory

D : Input/output ports

3. A 20-bit address bus can locate ________.

Options

A : 1,048,576 locations

B : 2,097,152 locations

C : 4,194,304 locations

D : 8,388,608 locations

4. Polled I/O works best when ________.

Options

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

5. Which microprocessor has multiplexed data and address lines?

Options

A : 8086/8088

B : 80286

C : 80386

D : Pentium

6. A mnemonic is an English-like instruction that is converted by an assembler into a machine code for use by a processor.

Options

A : True

B : False

C :

D :

7. Machine language is independent of the type of microprocessor in a computer system.

Options

A : True

B : False

C :

D :

8. Chip designers are always trying to increase the clock speed.

Options

A : True

B : False

C :

D :

9. Polling is the process of pausing the normal sequence of instructions to cause the processor to execute a separate set of I/O instructions instead.

Options

A : True

B : False

C :

D :

10. Instructions for the 80X86 family are downward compatible.

Options

A : True

B : False

C :

D :

1. A coprocessor is a microprocessor designed with a limited instruction set optimized to perform arithmetic operations very quickly.

Options

A : True

B : False

C :

D :

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