MCQs on Microcontrollers Part-7

Microprocessor and Microcontrollers

1. A programme written in machine language is called the______.

a. Object program

b. Source program

c. Hardware program

d. Both (b) and (c)

2. In 8085 microprocessor, the number of interrupts maskable and non-maskable are_____.

a. zero and five respectively

b. five and zero respectively

c. one and four respectively

d. four and one respectively

3. The interrupt pin TRAP of a 8085 microprocessor is______.

a. Level triggered

b. Edge triggered

c. Both edge and level triggered

d. Neither level nor edge triggered

4. A microcontroller differs from a microprocessor in terms of_____.

a. Memory configuration and instruction decoding

b. Memory configuration and I/O interfaces

c. I/O interfaces and instruction decoding

d. data bus width and clock speed

5. A  microprocessor program written in assembly language is translated into machine language. The number of instruction in the machine language when compared with the number of instructions in assembly language is______.

a. Less only

b. More only

c. Same

d. Either more or less

6. The number of input pins of 8085 microprocessor are_____.

a. 27

b. 19

c. 21

d. 40

7. Which of the following statements is correct? In 8085 microprocessor, the READY signal is useful when the CPU communicates with_____.

a. A DMA controller chip

b. A PPI chip

c. A slow peripheral device

d. A fast peripheral device

8. The highest integer that can be stored in an 8-bit accumulator is___.

a. 255

b. 144

c. 64

d. 256

9. The number of general 8-bit registers in 8085 microprocessor are_____.

a. 12

b. 6

c. 9

d. 3

10. In 8085 pairing of registers B, C, D, E, H, L is ____.

a. B-C, D-L, H-E

b. B-C, D-E, H-L

c. B-D, C-E, H-L

d. either of these

11. In a microprocessor, the program counter points to the address location from where the______.

a. Next byte is to be fetched

b. Current byte is to be fetched

c. Next byte is to be stored

d. Current byte is to be added

12. Microprocessor based instrument can be used to measure_______.

a. Flow only 

b. Temperature only

c. Pressure only

d. All the above quantities

13. Which interrupt has the lowest priority?

a. INTR

b. TRAP

c.  RST 4.5

d. RST 7.5

14. What is the vector address of interrupt RST 6?

a. 0030H

b. 0024H

c. 0034H

d. 0038H

15. Which of the following is a software interrupt?

a. RST 4.5

b. RST 0

c. Both of these

d. None of these