MCQOPTIONS
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MCQOPTIONS
This section includes 209 Mcqs, each offering curated multiple-choice questions to sharpen your Microprocessor knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The DTL, TTL, ECL and CMOS families of digital ICs are compared in the following 4 columns (P) (Q) (R) (S)A. Fan out is minimumDTL DTL TTL CMOS B.Power consumption is minimumTTL CMOS ECL DTLC. Propagation delay is minimumCMOS ECL TTL FTLThe correct column is |
| A. | P |
| B. | R |
| C. | Q |
| D. | S |
| Answer» C. Q | |
| 2. |
f3 (x2, x1, x0) =? |
| A. | M (0, 4, 6, 7) |
| B. | M (1, 4, 5, 6, 7) |
| C. | M (1, 2, 3, 5) |
| D. | M (2, 3, 4, 7) |
| Answer» C. M (1, 2, 3, 5) | |
| 3. |
f2 (x2, x1, x0) =? |
| A. | m (1, 2, 5, 6) |
| B. | m (1, 2, 6, 7) |
| C. | m (2, 3, 4) |
| D. | None of these |
| Answer» C. m (2, 3, 4) | |
| 4. |
Z1 =? |
| A. | a + b + c |
| B. | ab + ac + bc |
| C. | a ⊙ b ⊙ c |
| D. | a b c |
| Answer» E. | |
| 5. |
The present output Qn of an edge triggered JK flip flop is logic O. If J = 1, then Qsub>n + 1 |
| A. | cannot be determined |
| B. | will be logic O |
| C. | will be logic 1 |
| D. | will race around |
| Answer» D. will race around | |
| 6. |
Z2 =? |
| A. | ab + bc + ca |
| B. | a + b + c |
| C. | abc |
| D. | a ⊙ b ⊙ c |
| Answer» B. a + b + c | |
| 7. |
(177)8 + 1 = (x)8, the value of x is |
| A. | 178 |
| B. | 179 |
| C. | 200 |
| D. | none of these |
| Answer» D. none of these | |
| 8. |
How many ones are there in 3 512 + 7 64 + 5 8 + 3 |
| A. | 8 |
| B. | 9 |
| C. | 10 |
| D. | 11 |
| Answer» C. 10 | |
| 9. |
The number of bits in a binary PCM system is increased from n to n + 1. As a result, the signal to quantization noise ratio will improve by the |
| A. | |
| B. | 2 |
| C. | 2 |
| D. | |
| E. | which is independent of n |
| Answer» D. | |
| 10. |
In the Q. 159, if in addition following code exists from 0109 H onwards ORI 40 H ADD M What will be the result in the accumulator after the last instruction is executed? |
| A. | 40 H |
| B. | 20 H |
| C. | 60 H |
| D. | 42 H |
| Answer» D. 42 H | |
| 11. |
The following program is run on an 8085 microprocessor,Memory address in Hex Instruction2000 LXI SP, 10002003PUSH H2004 PUSH H2004 PUSH D2005 CALL 20502008 POP H2009HLTAs the completion of execution of the program, the program counter of the 8085 contains , and the stack pointer contains |
| A. | 2050, OFFC |
| B. | 2251, OFFC |
| C. | 1025, OCCF |
| D. | 1125, OCCF |
| Answer» B. 2251, OFFC | |
| 12. |
An Intel 8085 processor is executing the program given below. MVI A, 10H MVI B, 10H BACK: NOP ADD B RLC JNC BACK HLTThe number of times that the operation NOP will be executed is equal to |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 13. |
The following program starts at location 0100 H LXI SP, 00FF LXI H, 0701H MVI A, 20H SUB M The content of the accumulator when the program counter reaches 0109 H is |
| A. | 20 H |
| B. | 02 H |
| C. | 00 H |
| D. | FF H |
| Answer» B. 02 H | |
| 14. |
Consider the sequence of 8085 instructions given below LXI H, 9258 MOV A, M CMA MOV M, A Which one of the following program is performed by this sequence? |
| A. | Contents of location 9258 are moved to the accumulator |
| B. | Contents of location 9258 are compared with the contents of the accumulator |
| C. | Contents of location 8259 are complemented and stored in location 8529 |
| D. | Contents of location 5892 are complemented and stored in location 5982 |
| Answer» B. Contents of location 9258 are compared with the contents of the accumulator | |
| 15. |
There are four Boolean variables x1, x2, x3 and x4. The following functions are defined on sets of themf (x3, x2, x1) = m (3, 4, 5) g (x4, x3, x2) = m (1, 6, 7) h (x4, x3, x2, x1) = fg Then h (x4, x3, x2, x1) is |
| A. | m (3, 12, 13) |
| B. | m (3, 6) |
| C. | m (3, 12) |
| D. | 0 |
| Answer» B. m (3, 6) | |
| 16. |
The following program is written for an 8085 microprocessor to add two bytes located at memory addresses 1FFE and 1FFFLXI H,1FFEMOVB, MINRLMOVA, MADDBINRLMOVM, AXORAOn completion of the execution of the program, the result of addition is found |
| A. | in the register A |
| B. | at the memory address 1000 |
| C. | at the memory address 1F00 |
| D. | at the memory address 2000 |
| Answer» E. | |
| 17. |
If function W, X, Y and Z are as followsW = R + P Q + R S X = PQ R S + P Q R S + P Q R S Y = RS + PR + P Q + P QZ = R + S + PQ + P Q R + P Q S Then |
| A. | W = Z, X = |
| B. | W = Z, X = Y |
| C. | W = Y |
| D. | W = Y = |
| Answer» B. W = Z, X = Y | |
| 18. |
Memory size of a memory IC can be specified as |
| A. | m n where m = no. of memory locations, n = no. of bits in each location |
| B. | n m, where n = no. of bits in each location, m = no. of locations |
| C. | 2 |
| D. | m, where n = no. of address bits, m = no. of bits in each location |
| E. | either (A) or (C) |
| Answer» E. either (A) or (C) | |
| 19. |
A function with don t care is as follows. g (X, Y, Z) = m (5, 6) + dc (1, 2, 4) For above function consider following expression1. XY Z + X YZ 2. XY + XZ3. XZ + XZ + YZ 4. YZ + YZ The solution for g are |
| A. | 1, 2 and 3 |
| B. | 1, 2 and 4 |
| C. | 1 and 4 |
| D. | 1 and 3 |
| Answer» C. 1 and 4 | |
| 20. |
The number of Boolean function that can be generated by n variables is equal to |
| A. | 2 |
| B. | 2 |
| C. | 2 |
| D. | 2 |
| E. | |
| Answer» C. 2 | |
| 21. |
If a three variable switching function is expressed as the product of maxterms by f (A, B, C) = M (0, 3, 5, 6) then it can also be expressed as the sum of minterms by |
| A. | m (0, 3, 5, 6) |
| B. | M (1, 2, 4, 7) |
| C. | m (1, 2, 4, 7) |
| D. | M (1, 3, 4, 7) |
| Answer» D. M (1, 3, 4, 7) | |
| 22. |
The other canonical form of f (A, B, C) = m (0, 1, 5, 7) is |
| A. | M (2, 3, 4, 6) |
| B. | M (2, 4, 6, 8) |
| C. | M (2, 5, 6, 7) |
| D. | M (1, 3, 5, 7) |
| Answer» B. M (2, 4, 6, 8) | |
| 23. |
The switching function f (A, B, C) = (A + B + C) (A + B + C) (A + B + C ) can also be written as |
| A. | m (2, 3, 6) |
| B. | m (0, 1, 4, 5, 7) |
| C. | m (1, 2, 5, 6, 7) |
| D. | m (0, 2, 4, 6) |
| Answer» C. m (1, 2, 5, 6, 7) | |
| 24. |
A switching function f (A, B, C, D) = A B CD + A BC D + A BCD + AB C D + AB CD can also be written as |
| A. | m (1, 3, 5, 7, 9) |
| B. | m (3, 5, 7, 9, 11) |
| C. | m (3, 5, 9, 11, 13) |
| D. | m (5, 7, 9, 11, 13) |
| Answer» C. m (3, 5, 9, 11, 13) | |
| 25. |
Find (177)8 + 1, in decimal |
| A. | 128 |
| B. | 200 |
| C. | 178 |
| D. | 179 |
| Answer» B. 200 | |
| 26. |
Identify the logic gate family which is slowest among the given logic |
| A. | ECL |
| B. | TTL |
| C. | CMOS |
| D. | I |
| E. | L |
| Answer» D. I | |
| 27. |
I2L is the modified version of |
| A. | RTL |
| B. | DTL |
| C. | TTL |
| D. | DCTL |
| Answer» E. | |
| 28. |
The figure of merit has minimum value for |
| A. | I |
| B. | L |
| C. | NMOS |
| D. | ECL |
| E. | TTL |
| Answer» B. L | |
| 29. |
The logic family with highest noise margins is |
| A. | HTL |
| B. | I |
| C. | L |
| D. | TTL |
| E. | CMOS |
| Answer» B. I | |
| 30. |
The logic family which is most suitable in the industrial environment is |
| A. | I |
| B. | L |
| C. | HTL |
| D. | TTL |
| E. | CMOS |
| Answer» C. HTL | |
| 31. |
I2L logic basically consists of |
| A. | Normal bipolar junction transistors |
| B. | Multiple collector transistors |
| C. | Multiple emitter transistors |
| D. | None of these |
| Answer» C. Multiple emitter transistors | |
| 32. |
Which of the following logic family has maximum fan-out? |
| A. | CMOS |
| B. | I |
| C. | L |
| D. | PMOS |
| E. | ECL |
| Answer» B. I | |
| 33. |
The logic swing is maximum for the logic family |
| A. | I |
| B. | L |
| C. | ECL |
| D. | CMOS |
| E. | T TL |
| Answer» D. CMOS | |
| 34. |
A certain JK flip-flop has tpd = 12 5 ns. The largest MOD counter that can be constructed from these flip-flops and still operate upto 10 MHz is |
| A. | any |
| B. | 8 |
| C. | 256 |
| D. | 10 |
| Answer» D. 10 | |
| 35. |
Convert (205)10 = (x)16? |
| A. | CD |
| B. | DC |
| C. | 8A |
| D. | 12E |
| Answer» B. DC | |
| 36. |
How many NAND gates are required to make AB + BA? |
| A. | 8 |
| B. | 6 |
| C. | 4 |
| D. | 5 |
| Answer» D. 5 | |
| 37. |
Implement Y = A + BC + AC requires minimum number of NAND gate are |
| A. | 4 |
| B. | 6 |
| C. | 5 |
| D. | 3 |
| Answer» B. 6 | |
| 38. |
Minimum number of 2-input NAND gates required to implement the function F = (X +Y) (Z + W) |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 5 |
| Answer» C. 6 | |
| 39. |
Consider the Boolean expressionX = ABCD + ABCD + ABCD + ACBDThe simplified form of X is |
| A. | + |
| B. | C |
| C. | CD |
| D. | BC |
| Answer» D. BC | |
| 40. |
How many 1's are present in the binary representation of 3 512 + 7 64 + 5 8 + 3? |
| A. | 8 |
| B. | 9 |
| C. | 10 |
| D. | 11 |
| Answer» C. 10 | |
| 41. |
11001, 1001 and 111001 correspond to the 2 s complement representation of which one of the following sets of numbers? |
| A. | 25, 9 and 57 respectively |
| B. | 6, 6 and 6 respectively |
| C. | 7, 7 and 7 respectively |
| D. | 25, 9 and 57 respectively |
| Answer» D. 25, 9 and 57 respectively | |
| 42. |
The range of the signed decimal numbers that can be represented by 6-bit 1 s complement numbers is |
| A. | 31 to + 31 |
| B. | 63 to + 64 |
| C. | 64 to + 63 |
| D. | 32 to + 31 |
| Answer» B. 63 to + 64 | |
| 43. |
A master-slave F/F has the characteristic that |
| A. | change in the input is immediately reflected in the output |
| B. | change in the output occurs when the state of the master is affected |
| C. | change in the output occurs when the state of slave is affected |
| D. | both the master and the slave state are affected at the same time |
| Answer» D. both the master and the slave state are affected at the same time | |
| 44. |
This circuit act as a |
| A. | Full adder |
| B. | Half adder |
| C. | Full subtractor |
| D. | Half subtractor |
| Answer» B. Half adder | |
| 45. |
The present output Q |
| A. | cannot be determined |
| B. | will be logic O |
| C. | will be logic 1 |
| D. | will race around |
| Answer» D. will race around | |
| 46. |
Decimal 43 in Hexadecimal and BCD number system is respectively |
| A. | B2, 01000011 |
| B. | 2B, 01000011 |
| C. | 2B, 00110100 |
| D. | B2, 01000100 |
| Answer» D. B2, 01000100 | |
| 47. |
The output Y for the same data given in Q. 261 |
| A. | A + B |
| B. | B + C |
| C. | C + A |
| D. | None of these |
| Answer» E. | |
| 48. |
(177)8 + 1 = (x) |
| A. | 178 |
| B. | 179 |
| C. | 200 |
| D. | none of these |
| Answer» D. none of these | |
| 49. |
How many ones are there in |
| A. | 8 |
| B. | 9 |
| C. | 10 |
| D. | 11 |
| Answer» C. 10 | |
| 50. |
A computer has the following negative number stored in the binary form as shown, the wrongly stored number is |
| A. | 37 as 11011011 |
| B. | 89 as 10100111 |
| C. | 48 as 11101000 |
| D. | 32 as 11100000 |
| Answer» D. 32 as 11100000 | |