MCQOPTIONS
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MCQOPTIONS
This section includes 35 Mcqs, each offering curated multiple-choice questions to sharpen your Digital Electronics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Assembly language is written using mnemonics: MVI, DCR, JZ. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 2. |
Conversion from assembly language to machine language can be done by the programmer through a process called hand assembly. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 3. |
The 8085 software is compatible with the 8080A. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 4. |
LDA addr and STA addr are Fortran language instructions stored in an external memory IC for a microprocessor. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 5. |
A microprocessor with the necessary support circuits will include at least two memory ICs: ROM or EPROM, and a RAM. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 6. |
What kind of computer program is used to convert mnemonic code to machine code? |
| A. | debug |
| B. | assembler |
| C. | C++ |
| D. | Fortran |
| Answer» C. C++ | |
| 7. |
Single-bit indicators that may be set or cleared to show the results of logical or arithmetic operations are the: |
| A. | flags |
| B. | registers |
| C. | monitors |
| D. | decisions |
| Answer» B. registers | |
| 8. |
Which of the following are the three basic sections of a microprocessor unit? |
| A. | operand, register, and arithmetic/logic unit (ALU) |
| B. | control and timing, register, and arithmetic/logic unit (ALU) |
| C. | control and timing, register, and memory |
| D. | arithmetic/logic unit (ALU), memory, and input/output |
| Answer» C. control and timing, register, and memory | |
| 9. |
Because microprocessor CPUs do not understand mnemonics as they are, they have to be converted to ________. |
| A. | hexadecimal machine code |
| B. | binary machine code |
| C. | assembly language |
| D. | all of the above |
| Answer» C. assembly language | |
| 10. |
The items that you can physically touch in a computer system are called: |
| A. | software |
| B. | firmware |
| C. | hardware |
| D. | none of the above |
| Answer» D. none of the above | |
| 11. |
The software used to drive a microprocessor-based system is called FORTRAN. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» C. 1 | |
| 12. |
The technique of assigning a memory address to each I/O device in the computer system is called: |
| A. | memory-mapped I/O |
| B. | ported I/O |
| C. | dedicated I/O |
| D. | wired I/O |
| Answer» B. ported I/O | |
| 13. |
The 8085A is a(n): |
| A. | 16-bit parallel CPU |
| B. | 8-bit serial CPU |
| C. | 8-bit parallel CPU |
| D. | none of the above |
| Answer» D. none of the above | |
| 14. |
Which of the following buses is primarily used to carry signals that direct other ICs to find out what type of operation is being performed? |
| A. | data bus |
| B. | control bus |
| C. | address bus |
| D. | address decoder bus |
| Answer» C. address bus | |
| 15. |
A register in the microprocessor that keeps track of the answer or results of any arithmetic or logic operation is the: |
| A. | stack pointer |
| B. | program counter |
| C. | instruction pointer |
| D. | accumulator |
| Answer» E. | |
| 16. |
Programs written for the 8080A must have slight modifications to run on the 8085A. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 17. |
What type of circuit is used at the interface point of an output port? |
| A. | decoder |
| B. | latch |
| C. | tristate buffer |
| D. | none of the above |
| Answer» C. tristate buffer | |
| 18. |
Which bus is a bidirectional bus? |
| A. | address bus |
| B. | data bus |
| C. | address bus and data bus |
| D. | none of the above |
| Answer» C. address bus and data bus | |
| 19. |
I/O-mapped systems identify their input and output devices by giving them an 8-bit port number. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 20. |
I/O mapped systems identify their input/output devices by giving them a(n) ________. |
| A. | 8-bit port number |
| B. | 16-bit port number |
| C. | 8-bit buffer number |
| D. | 8-bit instruction |
| Answer» B. 16-bit port number | |
| 21. |
What type of circuit is used at the interface point of an input port? |
| A. | decoder |
| B. | latch |
| C. | tristate buffer |
| D. | none of the above |
| Answer» D. none of the above | |
| 22. |
When referring to instruction words, a mnemonic is: |
| A. | a short abbreviation for the operand address |
| B. | a short abbreviation for the operation to be performed |
| C. | a short abbreviation for the data word stored at the operand address |
| D. | shorthand for machine language |
| Answer» C. a short abbreviation for the data word stored at the operand address | |
| 23. |
A microcontroller integrates multichip systems with RAM, ROM, and I/O. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 24. |
All computer programs for a machine are called: |
| A. | software |
| B. | firmware |
| C. | hardware |
| D. | none of the above |
| Answer» B. firmware | |
| 25. |
The register in the 8085A that is used to keep track of the memory address of the next op-code to be run in the program is the: |
| A. | stack pointer |
| B. | program counter |
| C. | instruction pointer |
| D. | accumulator |
| Answer» C. instruction pointer | |
| 26. |
What is the difference between a mnemonic code and machine code? |
| A. | There is no difference. |
| B. | Machine codes are in binary, mnemonic codes are in shorthand English. |
| C. | Machine codes are in shorthand English, mnemonic codes are in binary. |
| D. | address bus |
| Answer» C. Machine codes are in shorthand English, mnemonic codes are in binary. | |
| 27. |
The software used to drive microprocessor-based systems is called: |
| A. | assembly language |
| B. | firmware |
| C. | machine language code |
| D. | BASIC interpreter instructions |
| Answer» B. firmware | |
| 28. |
The ________ ensures that only one IC is active at a time to avoid a bus conflict caused by two ICs writing different data to the same bus. |
| A. | control bus |
| B. | control instructions |
| C. | address decoder |
| D. | CPU |
| Answer» D. CPU | |
| 29. |
The control bus and memories share a bidirectional bus in a typical microprocessor system. |
| A. | 1 |
| B. | |
| C. | software |
| D. | firmware |
| Answer» C. software | |
| 30. |
When was the first 8-bit microprocessor introduced? |
| A. | 1969 |
| B. | 1974 |
| C. | 1979 |
| D. | 1985 |
| Answer» C. 1979 | |
| 31. |
The stack is a data storage area in RAM used by certain microprocessor operations. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» B. | |
| 32. |
The circuits in the 8085A that provide the arithmetic and logic functions are called the: |
| A. | CPU |
| B. | ALU |
| C. | I/O |
| D. | none of the above |
| Answer» C. I/O | |
| 33. |
How many buses are connected as part of the 8085A microprocessor? |
| A. | 2 |
| B. | 3 |
| C. | 5 |
| D. | 8 |
| Answer» C. 5 | |
| 34. |
How many bits are used in the data bus? |
| A. | 7 |
| B. | 8 |
| C. | 9 |
| D. | 16 |
| Answer» C. 9 | |
| 35. |
The devices that provide the means for a computer to communicate with the user or other computers are referred to as: |
| A. | CPU |
| B. | ALU |
| C. | I/O |
| D. | none of the above |
| Answer» D. none of the above | |