| 51. | The complement of the function F = (A + B’)(C’ + D)(B’ + C) is: |
| a. | A’B + CD’ + BC' |
| b. | AB’ + C’D + B’C |
| c. | AB’ + CD’ + BC |
| d. | AB + BC + CD |
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Answer: (a).A’B + CD’ + BC'
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| 52. | To put the 8085 microprocessor in the wait state |
| a. | lower the-HOLD input |
| b. | lower the READY input |
| c. | raise the HOLD input |
| d. | raise the READY input |
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Answer: (b).lower the READY input
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| 53. | Comparing the time T1 taken for a single instruction on a pipelined CPU with time T2 taken on a non pipelined but identical CPU, we can say that |
| a. | T1 <= T2 |
| b. | T1 >= T2 |
| c. | T1 < T2 |
| d. | T1 is T2 plus the time taken for one instruction fetch cycle |
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Answer: (b).T1 >= T2
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| 54. | The 8085 microprocessor responds to the presence of an interrupt |
| a. | As soon as the TRAP pin becomes 'high' |
| b. | By checking the TRAP pin for 'high' status at the end of each instruction fetch |
| c. | By checking the TRAP pin for 'high' status at the end of the execution of each instruction |
| d. | By Checking the TRAP pin for 'high' status at regular intervals |
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Answer: (c).By checking the TRAP pin for 'high' status at the end of the execution of each instruction
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| 55. | The most appropriate matching for the following pairs X: Indirect addressing 1 : Loops Y: Immediate addressing 2 : Pointers Z: Auto decrement addressing 3: Constants is |
| a. | X-3, Y-2, Z-1 |
| b. | X-I, Y-3, Z-2 |
| c. | X-2, Y-3, Z-1 |
| d. | X-3, Y-l, Z-2 |
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Answer: (c).X-2, Y-3, Z-1
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| 56. | The simultaneous equations on the Boolean variables x, y, z and w, have the following solution for x, y, z and w, respectively.
 |
| a. | 0 1 0 0 |
| b. | 1 1 0 1 |
| c. | 1 0 1 1 |
| d. | 1 0 0 0 |
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Answer: (c).1 0 1 1
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| 57. | Which function does NOT implement the Karnaugh map given below?
 |
| a. | a |
| b. | b |
| c. | c |
| d. | d |
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Answer: (d).d
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| 58. | The following arrangement of master-slave flip flops has the initial state of P, Q as 0, 1 (respectively). After three clock cycles the output state P, Q is (respectively),
 |
| a. | 1, 0 |
| b. | 1, 1 |
| c. | 0, 0 |
| d. | 0,1 |
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Answer: (a).1, 0
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| 59. | Consider the values A = 2.0 x 10^30, B =-2.0 x 10^30, C= 1.0, and the sequence X: = A + B Y: = A + C X: = X + C Y: = Y + B executed on a computer where floating-point numbers are represented with 32 bits. The values for X and Y will be |
| a. | X = 1.0, Y = 1.0 |
| b. | X = 1.0, Y = 0.0 |
| c. | X = 0.0, Y = 1.0 |
| d. | X = 0.0, Y = 0.0 |
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Answer: (b).X = 1.0, Y = 0.0
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| 60. | A low memory can be connected to 8085 by using |
| a. | INTER |
| b. | RESET IN |
| c. | HOLD |
| d. | READY |
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Answer: (d).READY
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