A **microprocessor** is a computer processor in which the data processing logic and control is included on a single IC integrated circuit. A microprocessor contains the arithmetic, logic, and control circuitry that is required to perform the functions of a computer’s central processing unit. Given below are top 10 MCQs on microprocessors.

## The oldest commercially produced microprocessor was

The oldest commercially produced microprocessor was:

- Intel 4004
- MOS Technology 6502
- Intel 8080
- Intel 8085

Correct answer: 1. Intel 4004

Explanation: The Intel 4004 is a 4-bit central processing unit (CPU) released by Intel Corporation in 1971. It was the oldest commercially produced microprocessor.

Physical Specifications of Intel 4004:

Transistors: 2,300

Package: 16-pin DIP

Socket: DIP16

## Microprocessors contain

Microprocessors contain:

- Combinational logic
- Sequential digital logic
- Both of these
- None of these

Correct answer: Both of these

Explanation: Combinational logic is also sometimes referred to as time-independent logic or combinatorial logic. It is a type of digital logic that is implemented by Boolean circuits, where the output is a pure function of the present input only.

On the other hand sequential logic belongs to class of logic circuit whose output depends not only on the present value of the input signals but on the sequence of past inputs.

## World’s first 8-bit microprocessor was

World’s first 8-bit microprocessor was:

- MOS Technology 6502
- Intel 8080
- Intel 8085
- Intel 8008

Correct answer: 4. Intel 8008

History of Microprocessors:

## FPGA stands for

FPGA stands for

- Field Parallel Gate Array
- Forward Parallel Gate Array
- Field Programmable Gate Array
- Forward Programmable Gate Array

Correct answer: 3. Field Programmable Gate Array

Field Programmable Gate Array (FPGA) is an integrated circuit. It is a re-configurable hardware, which consists of millions of logic gates that could be configured to the user’s demand.

## A field programmable ROM is also called

A field programmable ROM is also called

- FROM
- FPROM
- MROM
- PROM

Correct answer: 4. PROM

Explanation: ROM’s are categorized into two types:

Permanent ROM’s

- MROM
- PROM

Erasable ROM’s

- EPROM
- EEPROM

A programmable ROM also referred to as a FPROM (field programmable read-only memory) or OTP (one-time programmable) chip.

## A mask programmed ROM is

A mask programmed ROM is

- Erasable electrically
- Programmed by the user
- Erasable and programmable
- Programmed at the time of fabrication

Correct answer: 4. Programmed at the time of fabrication

Explanation:

In case of a mask-programmed ROM, the ROM is programmed at the manufacturer‘s site as per the specifications of the customer. For mask-programmed ROM, the data is stored by the manufacturer during fabrication and user can not alter the data.

## Arithmetic and Logic Unit (ALU) of 8085 microprocessor consists of

Arithmetic and Logic Unit (ALU) of 8085 microprocessor consists of

- Accumulator, arithmetic and logic circuits
- Accumulator, arithmetic, logic circuits and five flags
- Accumulator, temporary register, arithmetic and logic circuits
- Accumulator, temporary register, arithmetic, logic circuits and five flags

Correct answer: 4. Accumulator, temporary register, arithmetic, logic circuits and five flags

## The first machine cycle of an instruction is always

The first machine cycle of an instruction is always

- A fetch cycle
- An I/O read cycle
- A memory write cycle
- A memory read cycle

Correct answer: 1. A fetch cycle

Explanation: The first machine cycle of an instruction is always fetch cycle.

## The smallest unit of data in a computer is

The smallest unit of data in a computer is:

- Octet
- Byte
- Nibble
- Bit

Correct answer: 4. Bit

**Bit:** A bit (short for binary digit) is the smallest unit of data in computer. A bit has single binary value, that is either 0 or 1.

**Byte:** A byte generally comprises of 8 bits

**Octet:** Sequency of 8 bits. For some systems the terminology octet is used for 8 bits instead of byte.

**Nibble:** Nibble refers to half a byte

## Number of pins on 8085 microprocessors are

Number of pins on 8085 microprocessors are:

- 20
- 40
- 80
- 160

Correct answer: 2. 40

Explanation: The Intel 8085 is 8-bit microprocessor produced by Intel and introduced in March 1976. The 8085 is supplied in 40-pin DIP package. In order to maximize the functions on the available pins, the 8085 uses a multiplexed address/data (AD^0-AD^7) bus.

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