MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 135 Mcqs, each offering curated multiple-choice questions to sharpen your Computer Science knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
How many gates (minimum ) are needed for a 3-bit up-counter using standard binary and using T flip-flops ? Assume unlimited fan-in. |
| A. | 4 |
| B. | 3 |
| C. | 2 |
| D. | 1 |
| Answer» E. | |
| 102. |
The number of clock pulses needed to shift one byte of data from input to the output of a 4-bit shift register is |
| A. | 11 |
| B. | 12 |
| C. | 16 |
| D. | 32 |
| Answer» D. 32 | |
| 103. |
A 2 MHz signal is applied to the input of a J-K flip-flop which is operating in the 'toggle' mode. the frequency of the signal at the output will be |
| A. | 1 MHz |
| B. | 2 MHz |
| C. | 4 MHz |
| D. | 8 MHz |
| Answer» B. 2 MHz | |
| 104. |
A J-K flip-flop has its J-input connected to logic level 1 and its input to the Q output pulse is fed to its clock input the flip-flop will now |
| A. | change its state at each clock pulse |
| B. | go to state 1 and stay there |
| C. | go to state 0 and stay there |
| D. | retain its previous state |
| Answer» B. go to state 1 and stay there | |
| 105. |
In a positive edge triggered JK flip-flop, a low J and low K produces |
| A. | no change |
| B. | low state |
| C. | high state |
| D. | toggle |
| Answer» C. high state | |
| 106. |
In a ripple counter using edge triggered JK filp-flops, the pulse input is applied to the |
| A. | clock input of all flip-flops |
| B. | clock input of one flip-flops |
| C. | J and K inputs of all flip-flops |
| D. | J and K inputs of one flip-flop |
| Answer» C. J and K inputs of all flip-flops | |
| 107. |
Flip-flop outputs are always |
| A. | complimentary |
| B. | the same |
| C. | independent of each other |
| D. | same as inputs |
| Answer» E. | |
| 108. |
Consider an RS flip-flops with both inputs set to 0. if a momentary '1' is applied at the input S, then the output |
| A. | Q will flip from 0 to 1 |
| B. | Q will flip from 0 to 1 and then back to 0 |
| C. | Q will flip from 1 to 0 |
| D. | Q will flip from 0 to 1 and then back to 0 |
| Answer» D. Q will flip from 0 to 1 and then back to 0 | |
| 109. |
The output of a sequential circuit depends on |
| A. | present inputs only |
| B. | past inputs only |
| C. | both present and past inputs |
| D. | present outputs only |
| Answer» E. | |
| 110. |
74 LS138 chip functions as |
| A. | decoder /demultiplexer |
| B. | encoder |
| C. | multiplexer |
| D. | memory element |
| Answer» C. multiplexer | |
| 111. |
A shift register can be used for |
| A. | parallel to serial conversion |
| B. | serial to parallel conversion |
| C. | digital delay line |
| D. | all of these |
| Answer» B. serial to parallel conversion | |
| 112. |
What is the maximum counting speed of a 4-bit binary counter which is composed of flip-flops with a propagation delay of 25 ns ? |
| A. | 1 MHz |
| B. | 10 MHz |
| C. | 100 MHz |
| D. | 4 MHz |
| Answer» B. 10 MHz | |
| 113. |
The number of flip-flops required in a decade counter is |
| A. | 3 |
| B. | 4 |
| C. | 5 |
| D. | 10 |
| Answer» C. 5 | |
| 114. |
How many flip-flop are needed to divide the input frequency by 64 ? |
| A. | 4 |
| B. | 5 |
| C. | 6 |
| D. | 8 |
| Answer» B. 5 | |
| 115. |
The master slave JK flip-flop is effectively a combination of |
| A. | a SR flip-flop and a T flip-flop |
| B. | an SR flip-flop and a D flip-flop |
| C. | a T flip-flop and a D flip-flop |
| D. | tow T flip-flops |
| Answer» D. tow T flip-flops | |
| 116. |
The functional difference between SR flip-flop and JK flip-flop is that JK flip-flop |
| A. | is faster than SR flip-flop |
| B. | has a feed back path |
| C. | accepts both inputs 1 |
| D. | dose not require external clock |
| Answer» D. dose not require external clock | |
| 117. |
When an inverter is placed between both inputs of an SR flip-flop, then resulting flip-flop is |
| A. | JK flip-flop |
| B. | D flip-flop |
| C. | T flip-flop |
| D. | Master slave JK flip-flop |
| Answer» E. | |
| 118. |
How many bits are required to encode all twenty six letters, ten symbols, and ten numerals ? |
| A. | 5 |
| B. | 6 |
| C. | 7 |
| D. | 46 |
| Answer» D. 46 | |
| 119. |
A sequential circuit outputs a ONE when an even number (> 0) of one's are input; otherwise the output is ZERO. The minimum number of states required is |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» C. 2 | |
| 120. |
The clock signals are used in sequential logic circuits to |
| A. | tell the time of the day |
| B. | tell how much time has elapsed since the system was turned on |
| C. | carry serial data signals |
| D. | synchronize events in various parts of system |
| Answer» B. tell how much time has elapsed since the system was turned on | |
| 121. |
A graphical display of the fundamental products in a truth-table is known as |
| A. | mapping |
| B. | graphing |
| C. | T-map |
| D. | kanangh-map |
| Answer» E. | |
| 122. |
A switching function is symmetric with respect to a set of literals if and only if the function remains unchanged after |
| A. | two of these literals are interchanged |
| B. | any permutation of the literals |
| C. | all the literals are changed in anticlockwise order |
| D. | all the literals are changed in clockwise order |
| Answer» C. all the literals are changed in anticlockwise order | |
| 123. |
Which of the following statements is true |
| A. | (A+B) (A+C)=AC+BC |
| B. | (A+B) (A+C) =AB +C |
| C. | (A+B) (A+C) =A+BC |
| D. | (A+B) (A+C)=AC+B |
| Answer» D. (A+B) (A+C)=AC+B | |
| 124. |
The Time required for a pulse to change from 10 to 90 percent of its maximum value is Called |
| A. | rise time |
| B. | decay time |
| C. | propagation time |
| D. | operating speed |
| Answer» B. decay time | |
| 125. |
The time Required for a gate or inverter to change its state is called |
| A. | rise time |
| B. | decay time |
| C. | propagation time |
| D. | charging time |
| Answer» D. charging time | |
| 126. |
The number of canonical expressions that can be developed over a 3-valued boolean algebra is |
| A. | 8 |
| B. | 16 |
| C. | 32 |
| D. | 64 |
| Answer» E. | |
| 127. |
Simplified form of the boolean expression (X+Y+XY) (X+Z) is |
| A. | X+Y+Z |
| B. | XY+YZ |
| C. | X+YZ |
| D. | XZ+Y |
| Answer» D. XZ+Y | |
| 128. |
SMD on a data sheet for an IC means |
| A. | Single Memory Device |
| B. | Serial Mode Data |
| C. | Synchronous Mode Device |
| D. | Surface Mount Device |
| Answer» E. | |
| 129. |
The functional capacity for VLSI devices is |
| A. | 1 to 11 gates |
| B. | 12 to 99 gates |
| C. | 100 to 10000 gates |
| D. | more than 10000 gates |
| Answer» E. | |
| 130. |
The functional capacity for LSI devices is |
| A. | 1 to 11 gates |
| B. | 12 to 99 gates |
| C. | 100 to 10000 gates |
| D. | more than 1000 gates |
| Answer» D. more than 1000 gates | |
| 131. |
The operation which is commutative but not associative is |
| A. | AND |
| B. | OR |
| C. | EX-OR |
| D. | NAND |
| Answer» E. | |
| 132. |
Analog methods are not used for handling extremely precise information because |
| A. | precise information always involves numbers which are inherently digital |
| B. | there are limits to how closely an analog signal can reproduce the information |
| C. | analog information never need to be precise |
| D. | they are very expensive |
| Answer» C. analog information never need to be precise | |
| 133. |
A digital gate can respond to an input signal in |
| A. | about a second |
| B. | about a hundredth of a second |
| C. | a few billionth of a second |
| D. | a few millisecond |
| Answer» D. a few millisecond | |
| 134. |
Digatal circuits easier to design than analog circuits because |
| A. | they do not control electricity precisely over a wide range |
| B. | they are made in the from of ICs |
| C. | all elements of digital circuits are from the same family |
| D. | they are smaller in size |
| Answer» B. they are made in the from of ICs | |
| 135. |
Analog systems are different from digital systems because they |
| A. | use transistors |
| B. | handle information in analog from |
| C. | handle information in digital form |
| D. | are slow |
| Answer» C. handle information in digital form | |