MCQOPTIONS
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MCQOPTIONS
This section includes 1271 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics & Communication Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 901. |
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. | |
| 902. |
Consider the following features: negative operands cannot be usedwhen immediate operand changes, the program should be reassembledthe program is difficult to readthe size of operand is restricted by word length of the computer Disadvantages of immediate addressing include |
| A. | 1 and 2 |
| B. | 2 and 4 |
| C. | 2 and 3 |
| D. | 1 and 4 |
| Answer» C. 2 and 3 | |
| 903. |
Assertion (A): A multiplexer can be used for data routing.Reason (R): A multiplexer has one input and many outputs. |
| 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 | |
| 904. |
The hexadecimal number 'A0' has the decimal value |
| A. | 80 |
| B. | 256 |
| C. | 100 |
| D. | 160 |
| Answer» E. | |
| 905. |
In the circuit shown below, the outputs Y1 and Y2 for the given initial condition Y1 = Y2 = 1 and after four input pulses will be |
| A. | Y1 = 1, Y2 = 0 |
| B. | Y1 = 0, Y2 = 0 |
| C. | Y1 = 0, Y2 = 1 |
| D. | Y1 = 1, Y2 = 1 |
| Answer» E. | |
| 906. |
2's complement number 00011111 = __________ 10 |
| A. | 31 |
| B. | -31 |
| C. | 11 |
| D. | -11 |
| Answer» B. -31 | |
| 907. |
The initial state of MOD-16 down counter is 011. After 37 clock pulses, the state of the counter will be |
| A. | 1011 |
| B. | 110 |
| C. | 101 |
| D. | 1 |
| Answer» D. 1 | |
| 908. |
DeMorgan's first theorem shows the equivalence of |
| A. | OR gate and Exclusive OR gate |
| B. | NOR gate and Bubbled AND gate |
| C. | NOR gate and NAND gate |
| D. | NAND gate and NOT gate |
| Answer» C. NOR gate and NAND gate | |
| 909. |
A VF display operates on the principle of a vacuum diode. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 910. |
The product of which of the following gives the figure of merit of a logic family? |
| A. | Gain and bandwidth |
| B. | Propagation delay time and power dissipation |
| C. | Fan-out and propagation delay time |
| D. | Noise margin and power dissipation |
| Answer» C. Fan-out and propagation delay time | |
| 911. |
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 | |
| 912. |
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 ‚à™ BM |
| A. | 20 H |
| B. | 02 H |
| C. | 00 H |
| D. | FFH |
| Answer» B. 02 H | |
| 913. |
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 | |
| 914. |
Full adder circuit can be implemented by |
| A. | Multiplexers |
| B. | Half adders |
| C. | AND or OR gates |
| D. | Decoders |
| Answer» B. Half adders | |
| 915. |
A crystal is frequently used in digital circuits for timing purpose because of its |
| A. | low cost |
| B. | high frequency stability |
| C. | simple circuitry |
| D. | ability to set frequency at desired value |
| Answer» C. simple circuitry | |
| 916. |
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 | |
| 917. |
Which of the following is used as switch? |
| A. | J-K flip-flop |
| B. | Master slave J-K flip-flop |
| C. | T-flip-flop |
| D. | D-flip-flop |
| Answer» E. | |
| 918. |
With on-chip decoding, n address lines can access |
| A. | 2n memory locations |
| B. | 2n2 memory locations |
| C. | 2n memory locations |
| D. | n2 memory location |
| Answer» D. n2 memory location | |
| 919. |
If the functions w, x, y, z are as follows.w = R + PQ + RS , x = PQR S + PQR S + PQ R SThen |
| A. | w = z x = z |
| B. | w = z, x = y |
| C. | w = y |
| D. | w = y = z |
| Answer» B. w = z, x = y | |
| 920. |
The number of select lines in a 16 : 1 multiplexer are |
| A. | 4 |
| B. | 3 |
| C. | 2 |
| D. | 1 |
| Answer» B. 3 | |
| 921. |
Assertion (A): Demorgan's first theorem replaces a NOR gate by bubbled AND gate.Reason (R): Double complement of a variable equals the variable. |
| 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 | |
| 922. |
If tp is the pulse width, Δt is the propagation delay, T is period of pulse train then the following condition can avoid the race around condition |
| A. | tp = Δt = T |
| B. | 2tp > Δt > T |
| C. | tp < Δt < T |
| D. | tp < Δt < T |
| Answer» D. tp < Œît < T | |
| 923. |
A 4 bit down counter can count from |
| A. | 0000 to 1111 |
| B. | 1111 to 0000 |
| C. | 000 to 111 |
| D. | 111 to 000 |
| Answer» C. 000 to 111 | |
| 924. |
Two 2's complement number having sign bits X and Y are added and the sign bit of the result is Z. then, the occurrence of overflow is indicated by the Boolean function. |
| A. | XYZ |
| B. | X Y Z |
| C. | X YZ + XY Z |
| D. | XY + YZ + ZX |
| Answer» E. | |
| 925. |
The decimal equivalent of ABC16 is |
| A. | 348 |
| B. | 2583 |
| C. | 2748 |
| D. | 33 |
| Answer» D. 33 | |
| 926. |
In register index addressing mode the effective address is given by |
| A. | index register value |
| B. | sum of the index register value and the operand |
| C. | operand |
| D. | difference of the index register value and the operand |
| Answer» C. operand | |
| 927. |
In an op-amp a virtual ground is a ground for |
| A. | voltage only |
| B. | current only |
| C. | both voltage and current |
| D. | neither voltage nor current |
| Answer» B. current only | |
| 928. |
A Karnaugh map with 4 variables has |
| A. | 2 cells |
| B. | 4 cells |
| C. | 8 cells |
| D. | 16 cells |
| Answer» E. | |
| 929. |
Assertion (A): In hybrid digital circuits the problem of logic race can occur.Reason (R): In two level logic there is no problem of logic race. |
| 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 | |
| 930. |
DeMorgan's second theorem is |
| A. | A . A = 0 |
| B. | A = A |
| C. | A + B = A . B |
| D. | AB = A + B |
| Answer» E. | |
| 931. |
A 3 bit synchronous counter uses FF with propagation delay time of 20 ns each. The maximum possible time required for change of state will be. |
| A. | 60 ns |
| B. | 40 ns |
| C. | 20 ns |
| D. | None |
| Answer» C. 20 ns | |
| 932. |
Computers use thousands of flip-flops. To coordinate the overall action, a common signal is sent to all flip-flop known as |
| A. | debug signal |
| B. | toggle signal |
| C. | active signal |
| D. | clock signal |
| Answer» E. | |
| 933. |
Consider the following digital circuits: MultipliersRead only memoriesD-latchCircuits as shown Which of these come under the class of combinational circuit? |
| A. | 1 and 2 |
| B. | 3 and 4 |
| C. | 1, 2 and 3 |
| D. | 1, 2, 3 and 4 |
| Answer» B. 3 and 4 | |
| 934. |
Consider the Boolean expression X = ABCD + ABCD + ABCD + ACBD The simplified form of X is |
| A. | C + D |
| B. | BC |
| C. | CD |
| D. | B |
| Answer» D. B | |
| 935. |
In figure, R = 20KΩ and C = 75 pF. The converter clock frequency will be |
| A. | 606 Hz |
| B. | 1212 Hz |
| C. | 555 KHz |
| D. | 606 KHz |
| Answer» B. 1212 Hz | |
| 936. |
Am equivalent 2's complement representation of the 2's complement number 1101 is |
| A. | 110100 |
| B. | 1101 |
| C. | 110111 |
| D. | 111101 |
| Answer» E. | |
| 937. |
In the above case the hexadecimal notation for the last memory location is |
| A. | 0 |
| B. | FFFF |
| C. | 3FFF |
| D. | 5FFF |
| Answer» C. 3FFF | |
| 938. |
Registers and counters are similar in the sense that they both |
| A. | count pulses |
| B. | store binary information |
| C. | are made from an array of flip-flops and gates integrated on a single chip |
| D. | are shift registers |
| Answer» D. are shift registers | |
| 939. |
When signed numbers are used in binary arithmetic, which of the following has unique representation for zero? |
| A. | Sign-magnitude |
| B. | 1's complement |
| C. | 2's complement |
| D. | 9's complement |
| Answer» D. 9's complement | |
| 940. |
Which one of the following is the correct sequence of the numbers represented in the series given below? |
| A. | 2, 3, 4, 5, 6...... |
| B. | 2, 4, 6, 8, 10 ..... |
| C. | 2, 4, 6, 10, 12...... |
| D. | 2, 4, 6, 10, 16 ..... |
| Answer» E. | |
| 941. |
A digital clock uses __________ chip |
| A. | SSI |
| B. | LSI |
| C. | VLSI |
| D. | MSI |
| Answer» C. VLSI | |
| 942. |
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 | |
| 943. |
The number of flip-flops required to build a mod-19 counter is |
| A. | 4 |
| B. | 5 |
| C. | 6 |
| D. | 7 |
| Answer» D. 7 | |
| 944. |
9's complement of 5610 is |
| A. | 4310 |
| B. | 8410 |
| C. | 6510 |
| D. | 5310 |
| Answer» B. 8410 | |
| 945. |
Average latency time of magnetic tape memory is of the order of |
| A. | 1 μ sec |
| B. | 1 msec |
| C. | 1 sec |
| D. | 1 minute |
| Answer» E. | |
| 946. |
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. | |
| 947. |
Which multivibrator can be used as a clock timer? |
| A. | Astable multivibrator |
| B. | Bistable multivibrator |
| C. | Any of the above |
| D. | None of the above |
| Answer» B. Bistable multivibrator | |
| 948. |
For the truth table of the given figure Y = |
| A. | A + B + C |
| B. | A + BC |
| C. | A |
| D. | B |
| Answer» E. | |
| 949. |
TTL uses |
| A. | multi-emitter transistors |
| B. | multi-collector transistors |
| C. | multi-base transistors |
| D. | multi-emitter or multi-collector transistors |
| Answer» B. multi-collector transistors | |
| 950. |
In 2's complement addition, the carry generated in the last stage is |
| A. | added to LSB |
| B. | neglected |
| C. | added to bit next to MSB |
| D. | added to the bit next to LSB |
| Answer» C. added to bit next to MSB | |