MCQOPTIONS
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MCQOPTIONS
This section includes 14 Mcqs, each offering curated multiple-choice questions to sharpen your 8051 Microcontroller knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
WHICH_OF_THE_FOLLOWING_STATEMENTS_ARE_CORRECT_ABOUT_THE_RCALL_INSTRUCTION??$ |
| A. | it is a 2 byte instruction |
| B. | it is a 4 byte instruction |
| C. | it is a 16 byte instruction |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 2. |
On power on SP points to the address?$ |
| A. | ffffH |
| B. | fffH |
| C. | 00h |
| D. | all of the mentioned |
| Answer» B. fffH | |
| 3. |
100$ |
| A. | 200 |
| B. | 20000 |
| C. | 2000 |
| Answer» C. 2000 | |
| 4. |
Which of the following is used to represent the last RAM address? |
| A. | MEM |
| B. | LASTRAM |
| C. | RAMEND |
| D. | None of the mentioned |
| Answer» B. LASTRAM | |
| 5. |
What is the time taken by one machine cycle if crystal frequency is 20MHz? |
| A. | 1.085 micro seconds |
| B. | 0.60 micro seconds |
| C. | 0.75 micro seconds |
| D. | 1 micro seconds |
| Answer» D. 1 micro seconds | |
| 6. |
Are PUSH and POP instructions are a type of CALL instructions? |
| A. | yes |
| B. | no |
| C. | none of the mentioned |
| D. | cant be determined |
| Answer» C. none of the mentioned | |
| 7. |
In the JMP instruction, how many bits are there for determining the target address? |
| A. | 16 |
| B. | 32 |
| C. | 22 |
| D. | 10 |
| Answer» E. | |
| 8. |
LCALL instruction takes |
| A. | 2 bytes |
| B. | 4 bytes |
| C. | 3 bytes |
| D. | 1 byte |
| Answer» C. 3 bytes | |
| 9. |
What is the relation between the target and the relative address? |
| A. | target address= PC address + relative address |
| B. | target address= relation address*2 |
| C. | relative address= PC address + target address |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 10. |
When the call instruction is executed the topmost element of stack comes out to be |
| A. | the address where stack pointer starts |
| B. | the address next to the call instruction |
| C. | address of the call instruction |
| D. | next address of the stack pointer |
| Answer» D. next address of the stack pointer | |
| 11. |
Which of the below mentioned are not the conditional jumps? |
| A. | BRLO |
| B. | BRMI |
| C. | BRVC |
| D. | None of the mentioned |
| Answer» B. BRMI | |
| 12. |
F3,02 |
| A. | F9,01 |
| B. | E9,01 |
| C. | E3,02 |
| Answer» C. E3,02 | |
| 13. |
JZ, JNZ, DJNZ, JC, JNC instructions monitor the bits of which register? |
| A. | DPTR |
| B. | B |
| C. | A |
| D. | PSW |
| Answer» E. | |
| 14. |
DJNZ R0, label is how many bit instructions? |
| A. | 2 |
| B. | 3 |
| C. | 1 |
| D. | Can’t be determined |
| Answer» B. 3 | |