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. |
For a Mod 64 parallel counter we need |
| A. | 6 flip flops |
| B. | 6 flip flops and 2 AND gates |
| C. | 6 flip flops and 4 AND gates |
| D. | none of the above |
| Answer» D. none of the above | |
| 2. |
Consider the following statements: 1. Race around condition can occur in JK flip flop when both inputs are 12. A flip flop is used to store one bit of information3. A transparent latch is a D type flip flop4. Master slave flip flop is used to store two bits of information Which of the above are correct? |
| A. | 1, 2, 3 |
| B. | 1, 3, 4 |
| C. | 1, 2, 4 |
| D. | 2, 3, 4 |
| Answer» E. | |
| 3. |
The number of distinct Boolean expression of 4 variables is |
| A. | 16 |
| B. | 256 |
| C. | 1024 |
| D. | 65536 |
| Answer» E. | |
| 4. |
Assertion (A): Synchronous counter has higher speed of operation than ripple counter Reason (R): Synchronous counter uses high speed flip flops. |
| 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 | |
| 5. |
The device 'one shot' has |
| A. | two stable states |
| B. | one stable state |
| C. | either 1 or 2 stable states |
| D. | no stable state |
| Answer» C. either 1 or 2 stable states | |
| 6. |
An AND gate has two inputs A and B and one inhibit input S. Out of total 8 input states, output is 1 in |
| A. | 1 state |
| B. | 2 states |
| C. | 3 states |
| D. | 4 states |
| Answer» B. 2 states | |
| 7. |
Which of the following characteristic are necessary for a sequential circuit? 1. It must have 6 gates2. It must have feedback3. Its output should depend on past value Which of the above statements are correct? |
| A. | 1, 2, 3 |
| B. | 1, 2 |
| C. | 2, 3 |
| D. | 1, 3 |
| Answer» D. 1, 3 | |
| 8. |
In 8085, TRAP is |
| A. | always maskable |
| B. | cannot interrupt a service subroutine |
| C. | used for catastrophic events like temporary power failure |
| D. | lowest priority interrupt |
| Answer» D. lowest priority interrupt | |
| 9. |
In a digital circuit, a clock is a |
| A. | crystal type |
| B. | multivibrator |
| C. | flip-flop |
| D. | free running multivibrator |
| Answer» E. | |
| 10. |
The logic operation that will selectively clear bits in register A in those positions where these are 1 's in the bits of register B is given by |
| A. | A ← A + B |
| B. | A ← A̅B |
| C. | A ← A̅ + B |
| D. | A ← AB |
| Answer» E. | |
| 11. |
A ring counter with 5 flip flops will have |
| A. | 5 states |
| B. | 10 states |
| C. | 32 states |
| D. | infinite states |
| Answer» B. 10 states | |
| 12. |
Which of the following flip flops cannot be converted to D flip flop? |
| A. | JK |
| B. | SR |
| C. | Master slave |
| D. | None of the above |
| Answer» E. | |
| 13. |
Binary 1111 when added to binary 11111, the result in binary is |
| A. | 111111 |
| B. | 1111 |
| C. | 1000 |
| D. | 10000 |
| Answer» E. | |
| 14. |
A half adder adds |
| A. | 2 bits |
| B. | 3 bits |
| C. | 4 bits |
| D. | 2 or 3 bits |
| Answer» B. 3 bits | |
| 15. |
The counter which require maximum number of FF for a given mod counter is |
| A. | Ripple counter |
| B. | BCD counter |
| C. | Ring counter |
| D. | Programmed counter |
| Answer» D. Programmed counter | |
| 16. |
The basic storage element in a digital system is |
| A. | flip flop |
| B. | counter |
| C. | multiplexer |
| D. | encoder |
| Answer» B. counter | |
| 17. |
Binary 1000 will be the result of which of the following? |
| A. | Binary 1000 - 100 |
| B. | Binary 1011 - 1111 |
| C. | Binary 1111 - 111 |
| D. | Binary 11111 - 1111 |
| Answer» D. Binary 11111 - 1111 | |
| 18. |
The number of flags available in 6800 are |
| A. | 6 |
| B. | 5 |
| C. | 7 |
| D. | 4 |
| Answer» B. 5 | |
| 19. |
In a 5 x 7 dot matrix, format, to store 64 alphanumeric characters we require |
| A. | 1120 bits |
| B. | 2240 bits |
| C. | 33 bits |
| D. | 64 bits |
| Answer» C. 33 bits | |
| 20. |
Microprocessors were introduced in the year |
| A. | 1951 |
| B. | 1961 |
| C. | 1971 |
| D. | 1981 |
| Answer» D. 1981 | |
| 21. |
Which of the following will be hexadecimal number just for prior to F52B? |
| A. | E 51 A |
| B. | F 51 B |
| C. | E 52 B |
| D. | F 52 A |
| Answer» E. | |
| 22. |
In floating point number 0110100000010101, the exponent is equal to __________ 10 |
| A. | 11 |
| B. | -11 |
| C. | 10 |
| D. | -10 |
| Answer» C. 10 | |
| 23. |
Logic analyser is |
| A. | a multichannel oscilloscope |
| B. | similar to logic pulser |
| C. | similar to current tracer |
| D. | none of the above |
| Answer» B. similar to logic pulser | |
| 24. |
The number of switching functions of 3 variables are |
| A. | 3 |
| B. | 8 |
| C. | 16 |
| D. | 32 |
| Answer» C. 16 | |
| 25. |
A 14 pin AND gate IC has __________ AND gates. |
| A. | 8 |
| B. | 6 |
| C. | 4 |
| D. | 2 |
| Answer» D. 2 | |
| 26. |
The open collector gates in the given figure are tied together. The output Y = |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 27. |
High speed counter |
| A. | ring counter |
| B. | ripple counter |
| C. | synchronous counter |
| D. | asynchronous counter |
| Answer» D. asynchronous counter | |
| 28. |
In 8085, to disable the whole interrupt system (except TRAP) |
| A. | the DI instruction may be used |
| B. | the DO instruction may be used |
| C. | the INTERRUPT instruction may be used |
| D. | the El instruction may be used |
| Answer» B. the DO instruction may be used | |
| 29. |
In which of these does thermionic emission occur? |
| A. | LED |
| B. | LCD |
| C. | VF display |
| D. | None |
| Answer» D. None | |
| 30. |
Which of the following statements is not true in regard to storage time of a diode? |
| A. | During this time, the diode is reverse-biased |
| B. | The diode conducts during this time |
| C. | It is due to the time taken by carriers to depart from the function when the diode is reverse-biased |
| D. | During this time the diode current is zero |
| Answer» E. | |
| 31. |
"Micro-program" is |
| A. | the name of the source program in microcomputer |
| B. | the set of instructions indicating the primitive operations in 1 system |
| C. | the general name of 'MACRO's' in assembly language programming |
| D. | the name of programs of very small size |
| Answer» C. the general name of 'MACRO's' in assembly language programming | |
| 32. |
In the CMOS inverter |
| A. | one transistor is N channel and the other P channel |
| B. | one is enhancement type and other depletion type |
| C. | both are N channel with one enhancement and the other depletion type |
| D. | none |
| Answer» C. both are N channel with one enhancement and the other depletion type | |
| 33. |
If we need a device to shut off a few ampere current in a few nano seconds, the proper devices is |
| A. | VMOS |
| B. | CMOS |
| C. | BJT |
| D. | UJT |
| Answer» B. CMOS | |
| 34. |
A pulse stretcher is same as a |
| A. | free running multivibrator |
| B. | bistable multivibrator |
| C. | monostable multivibrator |
| D. | latch |
| Answer» D. latch | |
| 35. |
Which of the following is the least important consideration while selecting a logic technology? |
| A. | Power dissipation |
| B. | Noise immunity |
| C. | Number of pins |
| D. | Cost |
| Answer» D. Cost | |
| 36. |
Assertion (A): R-2R ladder type DAC has higher speed of operation than weighted resistor DAC Reason (R): R-2R ladder type DAC uses only two different values of resistor network uses many different values of resistors |
| 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 | |
| 37. |
The race condition in NOR SR latch occurs when |
| A. | S = R = 1 |
| B. | S = 0, R = 1 |
| C. | S = 0, R = 0 |
| D. | S = 1, R = 0 |
| Answer» B. S = 0, R = 1 | |
| 38. |
Which device changes parallel data to serial data? |
| A. | Decoder |
| B. | Multiplexer |
| C. | Demultiplexer |
| D. | Flip flop |
| Answer» C. Demultiplexer | |
| 39. |
71₈ = __________ . |
| A. | 111000₂ |
| B. | 111001₂ |
| C. | 100001₂ |
| D. | 110001₂ |
| Answer» C. 100001₂ | |
| 40. |
Decimal 43 in hexadecimal and BCD number system is respectively. |
| A. | B2, 01000011 |
| B. | 2B, 01000011 |
| C. | 2B, 00110100 |
| D. | B2, 01000100 |
| Answer» C. 2B, 00110100 | |
| 41. |
Consider the following instruction of 8085 μp :1. MOV M, A2. AODC3. MVI A, FF4. CMP M Which of these cause change in the status of flag(s)? |
| A. | 1 and 2 |
| B. | 1, 2 and 3 |
| C. | 3 and 4 |
| D. | 2 and 4 |
| Answer» E. | |
| 42. |
In hexadecimal number system, A is equal to decimal number |
| A. | 10 |
| B. | 11 |
| C. | 17 |
| D. | 18 |
| Answer» B. 11 | |
| 43. |
A 4 bit down counter starts counting from 1111 irrespective of modulus. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» C. May be True or False | |
| 44. |
A 4 bit binary adder has 4 full adders. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» C. May be True or False | |
| 45. |
If an analog voltage is expressed in binary using 4 bits, each successive binary count would represent |
| A. | 1/2 of total voltage |
| B. | 1/4 of total voltage |
| C. | 1/15 of total voltage |
| D. | 1/16 of total voltage |
| Answer» D. 1/16 of total voltage | |
| 46. |
How many input-output ports can be accessed by direct method of 8085 μp? |
| A. | 8 |
| B. | 256 |
| C. | 32 K |
| D. | 64 K |
| Answer» C. 32 K | |
| 47. |
The 2's complement representation of the decimal number -4 is |
| A. | 0100 |
| B. | 1100 |
| C. | 1011 |
| D. | 1010 |
| Answer» C. 1011 | |
| 48. |
In a synchronous counter all flip flops are clocked together. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» B. False | |
| 49. |
In digital computer programming, subroutines are used |
| A. | to reduce program execution time at the expense of more memory |
| B. | to reduce storage requirements |
| C. | to increase programming ease and reduce storage requirements |
| D. | because most of the functions are same |
| Answer» D. because most of the functions are same | |
| 50. |
A typical microcomputer has 65, 536 registers in its memory. It will be specified as |
| A. | 65.536 memory |
| B. | 65.536 K memory |
| C. | 64 K memory |
| D. | 8 K memory |
| Answer» D. 8 K memory | |