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.
| 601. |
In 8085 microprocessor, which of the following interrupts is unmaskable interrupts? |
| A. | RST 5.5 |
| B. | RST 7.5 |
| C. | TRAP |
| D. | INTR |
| Answer» D. INTR | |
| 602. |
The code which provides for parity check is |
| A. | Baudot |
| B. | ASCII |
| C. | EBCDIC |
| D. | Excess-3 |
| Answer» C. EBCDIC | |
| 603. |
In ASCII, letter B is coded as |
| A. | 1000001 |
| B. | 1000010 |
| C. | 100100 |
| D. | 1001000 |
| Answer» C. 100100 | |
| 604. |
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 | |
| 605. |
A JK flip flop can be converted to D flip flop by |
| A. | Connecting both J and K terminals to D |
| B. | Connecting J terminal to D and leaving K open |
| C. | Connecting K terminal to D and leaving J open |
| D. | Connecting J terminal to D and K terminal to D through an inverter |
| Answer» E. | |
| 606. |
In which one of the following types of analog to digital convertors the conversion time is practically independent of the amplitude of the analog signal? |
| A. | The dual slope integrating type |
| B. | Successive approximation type |
| C. | Counter ramp type |
| D. | Tracking type |
| Answer» C. Counter ramp type | |
| 607. |
A pair of 21114s can store __________ words of __________ bits each. |
| A. | 2114, 8 |
| B. | 1024, 8 |
| C. | 4228, 16 |
| D. | 2114, 16 |
| Answer» C. 4228, 16 | |
| 608. |
Hexadecimal number F is called to octal number |
| A. | 15 |
| B. | 16 |
| C. | 17 |
| D. | 18 |
| Answer» D. 18 | |
| 609. |
A divide by 78 counter can be obtained by |
| A. | 6 numbers of mod-13 counters |
| B. | 13 numbers of mod-6 counters |
| C. | one mod-13 counter followed by mod-6 counter |
| D. | 13 number of mod-13 counters |
| Answer» D. 13 number of mod-13 counters | |
| 610. |
The ALU carrier out arithmetic and logic operations (OR AND, NOT, etc.) it processes |
| A. | decimal numbers |
| B. | binary numbers |
| C. | hexadecimal numbers |
| D. | octal numbers |
| Answer» C. hexadecimal numbers | |
| 611. |
How is inversion achieved using EX-OR gate? |
| A. | Giving input signal to the two input lines of the gate tied together |
| B. | Giving input to one input line and logic one to the other line |
| C. | Giving input to one input line and logic one to the other line |
| D. | Inversion cannot be achieved using EX-OR gate |
| Answer» D. Inversion cannot be achieved using EX-OR gate | |
| 612. |
26810 = __________ . |
| A. | 10A16 |
| B. | 10B16 |
| C. | 10C16 |
| D. | 10D16 |
| Answer» D. 10D16 | |
| 613. |
Which of them has 10 inputs and 4 outputs? |
| A. | Decimal to BCD encoder |
| B. | BCD to decimal decoder |
| C. | Octal to binary encoder |
| D. | All encoders |
| Answer» B. BCD to decimal decoder | |
| 614. |
Dual slope ADC uses an op amp comparator. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 615. |
The rate of change of digital signals between High and Low level is |
| A. | very fast |
| B. | fast |
| C. | slow |
| D. | very slow |
| Answer» B. fast | |
| 616. |
Which is correct with respect to computer memory? |
| A. | Only a particular address can have a particular memory |
| B. | Any address can have any memory |
| C. | To read a word from computer memory, it is not necessary to specify a location |
| D. | None of the above |
| Answer» C. To read a word from computer memory, it is not necessary to specify a location | |
| 617. |
Which of the following represents the decimal form of binary 0.0111? |
| A. | 0.16 |
| B. | 0.22728 |
| C. | 0.9375 |
| D. | 0.7964 |
| Answer» D. 0.7964 | |
| 618. |
The number of flip-flops needed to divide the input frequency by 32 is |
| A. | 2 |
| B. | 4 |
| C. | 5 |
| D. | 16 |
| Answer» D. 16 | |
| 619. |
In the assembler, which one of the following is required for variable name in symbol table? |
| A. | Addresses |
| B. | Values |
| C. | Registers |
| D. | Storage |
| Answer» D. Storage | |
| 620. |
Which of these is the most recent display device? |
| A. | LED |
| B. | LCD |
| C. | VF |
| D. | (a) and (c) |
| Answer» D. (a) and (c) | |
| 621. |
Assertion (A): The carry look ahead adder is very fast Reason (R): The carry look ahead adder generates the carry and sum digits directly. |
| 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 | |
| 622. |
BCD equivalent of - 810 is |
| A. | 110 |
| B. | 10110 |
| C. | 11000 |
| D. | 1000 |
| Answer» D. 1000 | |
| 623. |
For a level input sequential circuit |
| A. | output in a level only |
| B. | output is in the pulse form |
| C. | output may be a pulse or a level form |
| D. | none of these |
| Answer» B. output is in the pulse form | |
| 624. |
In 8085, usually the vector location and the next two memory location contain a JMP instruction. This allows the programs to branch to |
| A. | a longer subroutine |
| B. | a shorter subroutine |
| C. | a subroutine free path |
| D. | none of the above |
| Answer» B. a shorter subroutine | |
| 625. |
A 7477 decoder drives |
| A. | seven-segment display |
| B. | nickel tape |
| C. | relays |
| D. | diode matrix |
| Answer» B. nickel tape | |
| 626. |
In 8085 microprocessor, what is the length of status Word? |
| A. | 6 bits |
| B. | 8 bits |
| C. | 12 bits |
| D. | 16 bits |
| Answer» E. | |
| 627. |
A 4 bit ripple counter uses flip flops with propagation delay of 50 ns each. The maximum clock frequency which can be used is |
| A. | 5 MHz |
| B. | 10 MHz |
| C. | 20 MHz |
| D. | 25 MHz |
| Answer» B. 10 MHz | |
| 628. |
Assertion (A): Divide-64 counter is a Mod-64 counter and divides the input frequency by 64 Reason (R): A Mod 64 counter can be obtained by cascading Mod 16 and Mod 4 counters. |
| 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 | |
| 629. |
What will be minimum conversion rate in 6 bit dual slope A/D converter uses a reference of -6v and a 1 MHz clock. It uses a fixed count of 40 (101000). |
| A. | 9000 |
| B. | 9259 |
| C. | 1000 |
| D. | 1000 |
| Answer» C. 1000 | |
| 630. |
The widely used binary multiplication method is |
| A. | repeated addition |
| B. | add and shift |
| C. | shift and add |
| D. | any of the above |
| Answer» C. shift and add | |
| 631. |
Assuming accumulator contain A 64 and the carry is set (1). What will register A and carry (CY) contain after ORA A? |
| A. | A 6 H, 1 |
| B. | A 6 H, 0 |
| C. | 00 H, 0 |
| D. | 00 H, 1 |
| Answer» C. 00 H, 0 | |
| 632. |
Which of the following finds application in pocket calculators? |
| A. | TTL |
| B. | CMOS |
| C. | ECL |
| D. | Both (a) and (c) |
| Answer» C. ECL | |
| 633. |
In one of the codes for transfer of numbers the code for the succeeding number differs from that of the number only in the change of a single digit. The code is |
| A. | ASCII |
| B. | Excess 3 CODE |
| C. | Gray CODE |
| D. | none of these |
| Answer» D. none of these | |
| 634. |
Flag bits in arithmetic unit provide |
| A. | status type information |
| B. | repeatability |
| C. | facilities for rechecks |
| D. | all of the above |
| Answer» B. repeatability | |
| 635. |
A hexadecimal odometer displays F52F. The next reading will be |
| A. | E 52 F |
| B. | E 52 E |
| C. | E 53 F |
| D. | F 53 O |
| Answer» E. | |
| 636. |
Floating gate is fabricated for making MOS |
| A. | ROM |
| B. | PROM |
| C. | EPROM |
| D. | EAROM |
| Answer» D. EAROM | |
| 637. |
Which of the following memories normally has highest storage capacity? |
| A. | Magnetic disc |
| B. | Magnetic tape |
| C. | Semiconductor memory |
| D. | Core memory |
| Answer» B. Magnetic tape | |
| 638. |
Flow charts that contain decision symbol |
| A. | represent straight line programs |
| B. | do not represent straight line programs |
| C. | all of the above |
| D. | none of the above |
| Answer» C. all of the above | |
| 639. |
If A = B = 1, the outputs P and Q in the given figure are |
| A. | P = Q = 0 |
| B. | P = 0, Q = 1 |
| C. | P = 1, Q = 0 |
| D. | P = Q = 1 |
| Answer» C. P = 1, Q = 0 | |
| 640. |
In DTL the junction transistor serves as |
| A. | inverter |
| B. | buffer amplifier |
| C. | both (a) and (b) |
| D. | none of the above |
| Answer» D. none of the above | |
| 641. |
As compared to TTL, CMOS logic has |
| A. | higher speed of operation |
| B. | higher power dissipation |
| C. | smaller physical size |
| D. | all of the above |
| Answer» D. all of the above | |
| 642. |
In the given figure, A = B = 1 and C = D = 0. Then Y = |
| A. | 1 |
| B. | 0  |
| C. | either 1 or 0 |
| D. | indeterminate |
| Answer» C. either 1 or 0 | |
| 643. |
Single parity check is not reliable in case of |
| A. | paper tape |
| B. | magnetic tape |
| C. | magnetic drum |
| D. | cores |
| Answer» D. cores | |
| 644. |
For a binary half subtractor having two inputs A and B the correct sets of logical expressions for the outputs D (A - B) and X = Borrow are |
| A. | D = AB + AB, X = AB |
| B. | D = AB AB, X = AB |
| C. | D = AB + AB, X = AB |
| D. | D = AB + A B, X = AB |
| Answer» D. D = AB + A B, X = AB | |
| 645. |
Which two rows represent identical binary numbers? |
| A. | A second and fourth |
| B. | Fifth and eight |
| C. | Third and seventh |
| D. | Second and third |
| Answer» E. | |
| 646. |
An 8156 has A15 connected to its CE input. A14 to A8 are unconnected, and AD7 to AC0 are connected ignoring shadows, what are the RAM locations? |
| A. | (4000)H - (40FF)H |
| B. | (8000)H - (80FF)H |
| C. | (8000)H - (40FF)H |
| D. | Any of the above |
| Answer» C. (8000)H - (40FF)H | |
| 647. |
In the circuit of the given figure, Y = |
| A. | 0 |
| B. | 1 |
| C. | X |
| D. | X |
| Answer» B. 1 | |
| 648. |
Programmable logic array uses |
| A. | RAM matrices |
| B. | ROMs matrices |
| C. | PROM matrices |
| D. | Silo memory |
| Answer» C. PROM matrices | |
| 649. |
The binary equivalent of 4096.90625 is |
| A. | 1000000000000 |
| B. | 10000000000000 |
| C. | 1000000000000 |
| D. | 1000000000000 |
| Answer» B. 10000000000000 | |
| 650. |
The disadvantage of counter type ADC as compared to comparator ADC is that |
| A. | resolution is low |
| B. | conversion time is more |
| C. | circuit is more complex |
| D. | stability is low |
| Answer» B. conversion time is more | |