MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The following program starts at location 0100HL X ISP, 00FF - the content if accumulatorLXIH, 0701 - when the program counterMVI A, 20 H - reaches 0109 H is S BM |
| A. | 20 H |
| B. | 02 H |
| C. | 00 H |
| D. | FFH |
| Answer» B. 02 H | |
| 2. |
In 8085 microprocessor, what is the length of PC (program counter)? |
| A. | 6 bits |
| B. | 8 bit |
| C. | 12 bits |
| D. | 16 bits |
| Answer» E. | |
| 3. |
In decimal system the base of radix is |
| A. | 0 |
| B. | 1 |
| C. | 10 |
| D. | e |
| Answer» D. e | |
| 4. |
In a T flip-flop the output frequency is |
| A. | same as input frequency |
| B. | half of I/p frequency |
| C. | double the input frequency |
| D. | none |
| Answer» C. double the input frequency | |
| 5. |
The access time of ROM using bipolar transistors is about |
| A. | 1 sec |
| B. | 1 mili sec |
| C. | 1 sec |
| D. | 1 n sec |
| Answer» D. 1 n sec | |
| 6. |
10 in BCD code represent |
| A. | 10100 |
| B. | 1100 |
| C. | 010111 |
| D. | None of the above |
| Answer» E. | |
| 7. |
In LIFO |
| A. | only the top of the stack is immediately accessible |
| B. | only the top of the stack is never accessible |
| C. | only the first-in is accessible |
| D. | only the first-in is not accessible |
| Answer» B. only the top of the stack is never accessible | |
| 8. |
In RAM, all the information can be obtained at the output with |
| A. | minimum time delay |
| B. | unequal time delay |
| C. | nearly identical time delay |
| D. | maximum time delay |
| Answer» D. maximum time delay | |
| 9. |
What does the B register contain after the first MOV B, A has been executed? |
| A. | 40 H |
| B. | 60 H |
| C. | 80 H |
| D. | 80 D |
| Answer» B. 60 H | |
| 10. |
Program counter in a digital computer |
| A. | counts the number of program run in the machine |
| B. | counts the number of times a subroutine is called |
| C. | counts the number of times the loops are executed |
| D. | points the memory address of the current or the next instruction to be executed |
| Answer» E. | |
| 11. |
__________ switch, a T flip-flop is used as __________ switch, a T flip-flop is used as switch |
| A. | toggled, delay |
| B. | delay, toggle |
| C. | set reset |
| D. | reset, set |
| Answer» C. set reset | |
| 12. |
In a three variable K map four adjacent cells give |
| A. | single variable term |
| B. | two variable term |
| C. | three variable term |
| D. | either (a) or (b) |
| Answer» B. two variable term | |
| 13. |
The gate width of a monostable multivibrator is given by |
| A. | T = 1.1 RC |
| B. | T = 0.693 RC |
| C. | 0.963 RC |
| D. | T = 0.369 RC |
| Answer» C. 0.963 RC | |
| 14. |
In 2 out of 5 code, decimal number 8 is |
| A. | 11000 |
| B. | 10100 |
| C. | 11000 |
| D. | 1010 |
| Answer» C. 11000 | |
| 15. |
Assertion (A): 2's complement arithmetic is preferred in digital computers Reason (R): The hardware required to obtain 2's complement is simple. |
| A. | Both A and R are correct and R is correct explanation of A |
| B. | Both A and R are correct but R is not correct explanation of A |
| C. | A is true, R is false |
| D. | A is false, R is true |
| Answer» D. A is false, R is true | |
| 16. |
For the logic circuit of the given figure, Y = |
| A. | A + BC |
| B. | BC |
| C. | AB |
| D. | AB + C |
| Answer» D. AB + C | |
| 17. |
For edge triggering in flip flops, manufacturers use |
| A. | RC circuit |
| B. | direct coupled design |
| C. | either RC circuit or direct coupled design |
| D. | none of the above |
| Answer» C. either RC circuit or direct coupled design | |
| 18. |
A 4 bit counter with four flip-flops will count upto decimal |
| A. | 8 |
| B. | 15 |
| C. | 31 |
| D. | 63 |
| Answer» C. 31 | |
| 19. |
Out of the following memory types, one that is volatile is |
| A. | ferrite-core |
| B. | semiconductor RAM |
| C. | semiconductor ROM |
| D. | magnetic disc |
| Answer» C. semiconductor ROM | |
| 20. |
A number given in binary as 0101.01 is to be scaled up 4 times. The scaled up binary is |
| A. | 10101 |
| B. | 01.0101 |
| C. | 0404.04 |
| D. | 010.101 |
| Answer» B. 01.0101 | |
| 21. |
The problem of logic race occurs in |
| A. | SOP functions |
| B. | POS functions |
| C. | Hybrid function |
| D. | SOP and POS functions |
| Answer» D. SOP and POS functions | |
| 22. |
A shift register can be used for all of the following EXCEPT |
| A. | ring counter |
| B. | A/D conversion |
| C. | series to parallel conversion |
| D. | generation of delay |
| Answer» C. series to parallel conversion | |
| 23. |
In TTL the transistors are driven into and out of saturation. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 24. |
The most commonly used logic family is |
| A. | ECL |
| B. | TTL |
| C. | CMOS |
| D. | PMOS |
| Answer» C. CMOS | |
| 25. |
In 8085 microprocessor, even after a Reset operation which of the following interrupts remains enabled? |
| A. | INTR |
| B. | RST 5.5 |
| C. | RST 7.5 |
| D. | TRAP |
| Answer» E. | |
| 26. |
A decoder can be used as a demultiplexer. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 27. |
ADC 0804 is a |
| A. | dual slope A/D converter |
| B. | single slope A/D converter |
| C. | successive approximation A/D converter |
| D. | either (a) or (b) |
| Answer» D. either (a) or (b) | |
| 28. |
Assertion (A): BCD code is used in pocket calculatorsReason (R): BCD code is slower than binary. |
| A. | Both A and R are correct and R is correct explanation of A |
| B. | Both A and R are correct but R is not correct explanation of A |
| C. | A is true, R is false |
| D. | A is false, R is true |
| Answer» C. A is true, R is false | |
| 29. |
For a microprocessor system using IO-mapped IO the following statement is NOT true |
| A. | memory space available is greater |
| B. | not all data transfer instructions are available |
| C. | IO and memory address spaces are distinct |
| D. | IO address space is greater |
| Answer» E. | |
| 30. |
In case of static storage elements |
| A. | information is permanently stored |
| B. | information is to be periodically refreshed |
| C. | information is to be intermittently refreshed |
| D. | information is lost in case power is removed |
| Answer» E. | |
| 31. |
In a positive edge triggered JK flip flop |
| A. | High J and High K produce inactive state |
| B. | Low J and High K produce inactive state |
| C. | Low J and Low K produce inactive state |
| D. | High J and Low K produce inactive state |
| Answer» D. High J and Low K produce inactive state | |
| 32. |
The density of the dynamic RAM is |
| A. | more than that of static RAM |
| B. | less than that of static RAM |
| C. | equal to that to static RAM |
| D. | equal to or more than that of static RAM |
| Answer» B. less than that of static RAM | |
| 33. |
The 2732 is 4096 x 8 EPROM. How many address lines does it have? |
| A. | 12 |
| B. | 24 |
| C. | 50 |
| D. | 100 |
| Answer» B. 24 | |
| 34. |
In 8085 microprocessor, if instruction RST is written in a program then the program will jump to location |
| A. | 0020 H |
| B. | 0024 H |
| C. | 0028 H |
| D. | 002 CH |
| Answer» D. 002 CH | |
| 35. |
In 8085 microprocessor, the RST 5.5 interrupt service routine start from location |
| A. | 0020 H |
| B. | 0024 H |
| C. | 0028 H |
| D. | 002 CH |
| Answer» E. | |
| 36. |
figure given below shows the internal schematic of a TTL AND-OR Invert (AOI) gate, For the input shown in the given figure, the output Y is |
| A. | 0 |
| B. | 1 |
| C. | AB |
| D. | AB |
| Answer» B. 1 | |
| 37. |
A pulse stretcher is same as a |
| A. | free running multivibrator |
| B. | bistable multivibrator |
| C. | monostable multivibrator |
| D. | latch |
| Answer» D. latch | |
| 38. |
The hexadecimal number given below represent decimal numbers which are multiples of DC, C8, BE, 46, IE |
| A. | 2 |
| B. | 6 |
| C. | 7 |
| D. | 10 |
| Answer» D. 10 | |
| 39. |
Which memory requires periodic recharging? |
| A. | All ROMS |
| B. | All RAMS |
| C. | Static RAM |
| D. | Dynamic RAM |
| Answer» E. | |
| 40. |
Binary multiplication 1 x 0 = |
| A. | 1 |
| B. | 0 |
| C. | 10 |
| D. | 11 |
| Answer» C. 10 | |
| 41. |
The circuit of the given figure performs |
| A. | OR function |
| B. | AND function |
| C. | exclusive OR function |
| D. | exclusive NOR function |
| Answer» C. exclusive OR function | |
| 42. |
The hex number EB16 represents binary number of |
| A. | 11101011 |
| B. | 10010110 |
| C. | 10101100 |
| D. | 11101011 |
| Answer» B. 10010110 | |
| 43. |
Flash ADC is |
| A. | serial ADC |
| B. | parallel ADC |
| C. | series-parallel ADC |
| D. | successive approximation ADC |
| Answer» C. series-parallel ADC | |
| 44. |
Which of the following logic no resistors are used? |
| A. | CMOS |
| B. | TTL |
| C. | 4 n sec ECL |
| D. | 8 sec ECL |
| Answer» B. TTL | |
| 45. |
With the switch in STOP position, Y will be equal to |
| A. | 0 |
| B. | 1 |
| C. | CLK |
| D. | none of these |
| Answer» C. CLK | |
| 46. |
PROM is |
| A. | Permanent Read Only Memory |
| B. | Polarized Read Only Memory |
| C. | Positive Read Only Memory |
| D. | Programmable Read Only Memory |
| Answer» E. | |
| 47. |
Decimal 17 in octal system is represented by |
| A. | 888 |
| B. | 111 |
| C. | 21 |
| D. | 27 |
| Answer» D. 27 | |
| 48. |
The number of programmable 8 bit registers of 6800 are |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» B. 3 | |
| 49. |
The seven bit Hamming code received is 0010001. If even parity has been used, the correct code is |
| A. | 0010001 |
| B. | 1110001 |
| C. | 0110001 |
| D. | 0011001 |
| Answer» E. | |
| 50. |
When two 4 bit parallel adders are cascaded we get |
| A. | 4 bit parallel adder |
| B. | 8 bit parallel adder |
| C. | 16 bit parallel adder |
| D. | none of the above |
| Answer» C. 16 bit parallel adder | |