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MCQOPTIONS
This section includes 883 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.
| 301. |
Read the following statements: 1. A μP generally interfaced to several memory chips and I/O devices2. Address space provided by μP is partitioned into sub sets of addresses3. Address map and address partition refer to different terms in address space Which of the above are correct? |
| A. | All |
| B. | 1 and 2 only |
| C. | 2 and 3 only |
| D. | 1, 3 only |
| Answer» C. 2 and 3 only | |
| 302. |
Read the following statements about time and space requirements of microprocessors 1. Space requirement is also known as memory requirement.2. Space requirement is expressed in terms of bytes.3. Time requirement is expressed in terms of states.4. Time requirement is expressed in terms of μ- s. Which of the above statements are correct? |
| A. | 1, 2 and 3 only |
| B. | 1, 2 and 4 only |
| C. | 2 and 3 only |
| D. | 1 and 4 only |
| Answer» B. 1, 2 and 4 only | |
| 303. |
Consider the statement20 X = A + B/C + D * YWhich of the following formulae does the above statement represent? |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 304. |
Consider the following symbols1. Letters A to Z and a to z2. Digits 0 to 93. Logical operators and, or, not4. Parenthesis ( ) Which of the above symbols are available in Pascal? |
| A. | 1 and 2 only |
| B. | 1, 2 and 3 only |
| C. | 1, 2 and 4 only |
| D. | All |
| Answer» E. | |
| 305. |
In Java it is possible to have 1. An array of integers2. An array of string objects3. An array of arrays4. An array on integer and strings Which of the above are correct? |
| A. | All |
| B. | 1, 2 and 3 only |
| C. | 1 and 2 only |
| D. | 1, 3 and 4 only |
| Answer» C. 1 and 2 only | |
| 306. |
Consider the following program in Pascal:X = 2.57X = (X + 0.06) * 10I = TRUNC (X)X = IX = X / 10.0The final value of X would be |
| A. | 2 |
| B. | 2.6 |
| C. | 2.63 |
| D. | 26.3 |
| Answer» C. 2.63 | |
| 307. |
Consider the following 1. The first letter of a Java variable is lower case.2. Each successive word in Java variable begins with a capital letter.3. All other letters are lower case.4. A Java variable can have a digit as first character. Which of the above are correct? |
| A. | All |
| B. | 1, 2, 3 only |
| C. | 1, 2, 4 only |
| D. | 2, 3, 4 only |
| Answer» C. 1, 2, 4 only | |
| 308. |
The number 0.004854 in normalized floating point mode is represented as |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 309. |
For the following expression, the correct Pascal equivalent is |
| A. | BETA * JCOS (OMEGA * T + THETA) / SQRT (SQR (BETA) + SQR (OMEGA)) |
| B. | BETA COS (OMEGA * T + THETA) / SQRT [SQR (BETA) + SQR (OMEGA)] |
| C. | BETA COS (OMEGA T + THETA) / SQRT [SQR (BETA) + SQR (OMEGA)] |
| D. | None of the above |
| Answer» B. BETA COS (OMEGA * T + THETA) / SQRT [SQR (BETA) + SQR (OMEGA)] | |
| 310. |
For converting a decimal number into octal number, the decimal number is expressed as a series of the type |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 311. |
Of the following circuits, the one which involves storage is |
| A. | RS Latch |
| B. | Mux |
| C. | Nand |
| D. | Decoder |
| Answer» B. Mux | |
| 312. |
When .9432 E – 4 is subtracted from .5452 E – 3 in normalized floating point mode |
| A. | None of the numbers is changed |
| B. | .9432 E – 4 is changed to .09432 E – 3 and .5452 E – 3 is not changed |
| C. | .5452 E – 3 is changed to 5.452 E – 4 but .9432 E – 4 is not changed |
| D. | Both Ihe numbers are changed and their exponents are, made equal to -5 |
| Answer» C. .5452 E – 3 is changed to 5.452 E – 4 but .9432 E – 4 is not changed | |
| 313. |
‘Burst refresh’ in DRAM is also called |
| A. | Concentrated refresh |
| B. | Distributed refresh |
| C. | Hidden refresh |
| D. | None of the above |
| Answer» B. Distributed refresh | |
| 314. |
The minimum number of transistors required to implement a two input AND gate is |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» D. 8 | |
| 315. |
If the number of address bits in a memory is reduced by 2 and the addressability is doubled, the size of the memory (i.e., the number of bits stored in the memory) |
| A. | Doubles |
| B. | Remains unchanged |
| C. | Halves |
| D. | Increases by 2^(address bits)/addressability |
| Answer» D. Increases by 2^(address bits)/addressability | |
| 316. |
A structure that stores a number of bits taken “together as a unit” is a |
| A. | Gate |
| B. | Mux |
| C. | Decoder |
| D. | Register |
| Answer» E. | |
| 317. |
Using DeMorgan’s Theorem we can convert any AND-OR structure into |
| A. | NAND-NAND |
| B. | OR-NAND |
| C. | NAND-NOR |
| D. | NOR-NAND |
| Answer» B. OR-NAND | |
| 318. |
If m is a power of 2, the number of select lines required for an m-input mux is: |
| A. | m |
| B. | 2^m |
| C. | log2 (m) |
| D. | 2*m |
| Answer» D. 2*m | |
| 319. |
Which of the following conditions is not allowed in an RS latch? |
| A. | R is asserted, S is asserted |
| B. | R is asserted, S is negated |
| C. | R is negated, S is asserted |
| D. | R is negated, S is negated |
| Answer» B. R is asserted, S is negated | |
| 320. |
For a memory with a 16-bit address space, the addressability is |
| A. | 16 bits |
| B. | 8 bits |
| C. | 2^16 bits |
| D. | Cannot be determined |
| Answer» E. | |
| 321. |
When the write enable input is not asserted, the gated D latch _________ its output. |
| A. | Can not change |
| B. | Clears |
| C. | Sets |
| D. | Complements |
| Answer» B. Clears | |
| 322. |
Which of the following pair of gates can form a latch? |
| A. | A pair of cross coupled OR |
| B. | A pair of cross copled AND |
| C. | A pair of cross coupled NAND |
| D. | A cross coupled NAND/OR |
| Answer» D. A cross coupled NAND/OR | |
| 323. |
We say that a set of gates is logically complete if we can build any circuit without using any other kind of gates. Which of the following sets are logically complete |
| A. | Set of {AND,OR} |
| B. | Set of {EXOR, NOT} |
| C. | Set of {AND,OR,NOT} |
| D. | None of the above |
| Answer» D. None of the above | |
| 324. |
Because we wish to allow each ASCII code to occupy one location in memory, most memories are __________ addressable. |
| A. | BYTE |
| B. | NIBBLE |
| C. | WORD (16 bits) |
| D. | DOUBLEWORD (32 bits) |
| Answer» B. NIBBLE | |
| 325. |
For the number A[15:0] = 0110110010001111, A[14:13] is ______ A[3:2]. |
| A. | Less than |
| B. | Greater than |
| C. | The same as |
| D. | Cannot be determined |
| Answer» D. Cannot be determined | |
| 326. |
Circuit A is a 1-bit adder; circuit B is a 1 bit multiplier.[Hint: Construct the truth table for the adder and the multiplier] |
| A. | Circuit A has more gates than circuit B |
| B. | Circuit B has more gates than circuit A |
| C. | Circuit A has the same number of gates as circuit B |
| D. | None of the above |
| Answer» B. Circuit B has more gates than circuit A | |
| 327. |
In one’s complement 8 bit representation 11111111 represents |
| A. | +0 |
| B. | -0 |
| C. | +1 |
| D. | -1 |
| Answer» C. +1 | |
| 328. |
A blank EPROM has |
| A. | all bits set to logical 0 |
| B. | all bits set to logical 1 |
| C. | half the total number of bits set to 0 and remaining half to logical 1 |
| D. | either (a) or (b) |
| Answer» C. half the total number of bits set to 0 and remaining half to logical 1 | |
| 329. |
In FORTRAN 77 IFIX (-73.2) gives the value |
| A. | 73 |
| B. | -73 |
| C. | -7 |
| D. | -73.2 |
| Answer» C. -7 | |
| 330. |
Virus is a |
| A. | computer hardware problem |
| B. | an operating system |
| C. | a computer program |
| D. | a computer language |
| Answer» D. a computer language | |
| 331. |
Read the following statements about address space in microprocessors An address space is a set of all possible addresses which can be generated by a microprocessor.Each address in the address space allows a designer to provide at least one memory or I/O location in the system.Two types of address spaces are memory and I/O address space.Some micro processors have only one type of address space. Which of the above are correct? |
| A. | All |
| B. | 1, 2, 3 only |
| C. | 1, 2, 4 only |
| D. | 1, 3, 4 only |
| Answer» B. 1, 2, 3 only | |
| 332. |
In which of the following 8085 instructions is the CY flag complemented? |
| A. | STC |
| B. | RRC |
| Answer» C. | |
| 333. |
In 8085, high level on INTR line can be recognised only if |
| A. | TRAP line is high but not RST line |
| B. | RST line is high but not TRAP line |
| Answer» C. | |
| 334. |
When a peripheral device is not ready for data transfer it will send to the microprocessor a |
| A. | low READY bit |
| B. | high READY bit |
| C. | low or high READY bit depending on whether input or output is activated |
| D. | none of the above |
| Answer» B. high READY bit | |
| 335. |
FORTRAN expression for 3b2-5a2 is |
| A. | SQRT (3 * B ** 2 - 5 * A ** 2) |
| B. | SQRT 3 * B ** 2 - 5 * A ** 2 |
| C. | SQRT (3 * b ** 2 - 5 * a ** 2) |
| D. | SQRT (3 * B ** 2) - SQRT (5 * A **2) |
| Answer» B. SQRT 3 * B ** 2 - 5 * A ** 2 | |
| 336. |
A failure rate of 0.01 percent in 1000 hours in a memory corresponds to an MTBF of |
| A. | 1000 hours |
| B. | 100000 hours |
| C. | 10 hours |
| D. | 100 hours |
| Answer» C. 10 hours | |
| 337. |
An instruction used to set cany flag in a computer is classified as |
| A. | logical |
| B. | program control |
| Answer» C. | |
| 338. |
Which of the following real expressions is incorrect in Pascal? |
| A. | Y - X |
| B. | (A + B) (C + D) |
| C. | X / Y - Z |
| D. | P * Z - 5.0 |
| Answer» C. X / Y - Z | |
| 339. |
Which of the following operations will give the result 2 in C? |
| A. | 4.0 / 2.0 |
| B. | 4 / 2.0 |
| Answer» B. 4 / 2.0 | |
| 340. |
If initial value of PROD is zero and a program adds X to PROD, Y times we get the result |
| A. | X + Y |
| B. | XY |
| C. | X / Y |
| D. | X - Y |
| Answer» C. X / Y | |
| 341. |
The standard FORTRAN exponential form of decimal number - 0.000000023 is |
| A. | 2.3 E - 8 |
| B. | -2.3 E - 8 |
| C. | 2.3 E - 7 |
| D. | -2.3 E - 7 |
| Answer» C. 2.3 E - 7 | |
| 342. |
If quadratic equation x2 - 1000x + 25 = 0 is solved using floating point arithmetic with 4 digit mantissa, the roots are |
| A. | .1000 E 4 and .1000 E 4 respectively |
| B. | .0000 E 4 and .0000 E 4 respectively |
| C. | .1000 E 4 and .0000 E 4 respectively |
| D. | None of the above |
| Answer» D. None of the above | |
| 343. |
8 bit data can have 256 numbers ranging from 00000000 to 111 111 11. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 344. |
Which of the following is type declaration statement in C? |
| A. | int bar |
| B. | s = s + 1 |
| C. | king = horse + 1 |
| D. | prin = prin * prin |
| Answer» B. s = s + 1 | |
| 345. |
In FORTRAN 77 the correct way to write mathematical expression is be |
| A. | A / (B * C) - D ** 2 |
| B. | A / B - C - D ** 2 |
| C. | A / BC - D ** 2 |
| D. | none of the above |
| Answer» B. A / B - C - D ** 2 | |
| 346. |
The signals in 8086 are in maximum mode when |
| A. | MN / Mx pin is left open |
| B. | none of the above |
| Answer» C. | |
| 347. |
In 8086 a word OA 50 FH is stored in 02 and 03 memory locations. Then |
| A. | OFH is stored at location 02 and 0 A 5 at location 03 and address of word is 03 |
| B. | OFH is stored at location 03 and 0 A 5 at location 02 and address of word is 03 |
| Answer» B. OFH is stored at location 03 and 0 A 5 at location 02 and address of word is 03 | |
| 348. |
A memory chip has 65536 cells in it. Then |
| A. | time required to access cell is more than that required to access cell 65536 |
| B. | either (a) or (b) |
| Answer» B. either (a) or (b) | |
| 349. |
Which of the following is not an assembler directive in 8085? |
| A. | D S |
| B. | D B |
| C. | D Q |
| D. | E Q U |
| Answer» D. E Q U | |
| 350. |
Which one is not a valid subscripted variable? |
| A. | KET(2* J, 3* 1 - 4) |
| B. | MET(J + 2, K - 4) |
| C. | A (2 I) |
| D. | VEL(I) |
| Answer» D. VEL(I) | |