MCQOPTIONS
Saved Bookmarks
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.
| 401. |
IC 74181 is a 4 bit device. |
| A. | 1 |
| B. | |
| C. | L X I rp, data 16 |
| D. | MOV M, r |
| Answer» B. | |
| 402. |
A 256 x 4 EPROM has |
| A. | 8 address pins and 4 data pins |
| B. | 8 address pins and 8 data pins |
| C. | 4 address pins and 8 data pins |
| D. | 4 address pins and 4 data pins |
| Answer» B. 8 address pins and 8 data pins | |
| 403. |
Consider the series Which of the following is true for above series? |
| A. | |
| B. | None of these |
| C. | 1 and 2 only |
| Answer» B. None of these | |
| 404. |
In memory mapped I/O means that |
| A. | an address on the address bus may refer either to a memory location or to an I/O device |
| B. | none of the above |
| C. | 1, 2 and 4 only |
| D. | All |
| Answer» B. none of the above | |
| 405. |
Which of the following is the software for financial accounting? |
| A. | COBOL |
| B. | MS WORD |
| C. | Page maker |
| D. | DB III plus |
| Answer» E. | |
| 406. |
What does the instruction 'PCHL' in 8085 do? |
| A. | Load the program counter with contents of register pair H L |
| B. | Double the contents of register pair H L |
| C. | Shift the contents of register pair H L by one bit to the right |
| D. | Shift the contents of register pair H L by one bit to left |
| Answer» B. Double the contents of register pair H L | |
| 407. |
Instruction cycle is the time required to complete the execution of an instruction. |
| A. | 1 |
| B. | |
| C. | S = 0, Z = 1, AC = 1, P = 0 and CY=1 |
| D. | S = 1, Z = 1, AC = 1, P = 0 and CY=1 |
| Answer» B. | |
| 408. |
The general purpose register code for accumulator in 8085 is |
| A. | 1 |
| B. | 1111 |
| C. | VER |
| D. | COPY |
| Answer» B. 1111 | |
| 409. |
A string constant in basic is |
| A. | a string of capital alphabets A to Z, included in question mark |
| B. | a string of capital alphabets A to Z and digits 0 to 9 included in question mark |
| C. | a string of capital alphabets A to Z, digits 0 to 9 and special characters |
| D. | a string of capital alphabets A to Z, digits 0 to 9 and special characters included in question mark |
| Answer» E. | |
| 410. |
Which of the following alphanumeric characters is not allowed in Basic? |
| A. | capital letters A to Z |
| B. | lower case letters a to z |
| C. | digits 0 to 9 |
| D. | special characters +, -, *, / etc |
| Answer» E. | |
| 411. |
Consider the following program in Basic5 READ R 10 D = 2 * R 20 A = 3.1416 * D * D / 4 30 PRINT A Assuming that R = 3.0, the output A = |
| A. | 2.827 |
| B. | 28.27 |
| C. | 282.7 |
| D. | 2827 |
| Answer» C. 282.7 | |
| 412. |
In a micro computer the control bus |
| A. | transmits and receives control signals between processor and other devices |
| B. | transmits and receives control signals, also sends and receives data |
| C. | transmits and receives control signals, sends and receives data and transmits address of the device |
| D. | none of the above |
| Answer» B. transmits and receives control signals, also sends and receives data | |
| 413. |
The maximum number of characters for variable names in C is |
| A. | 12 |
| B. | 16 |
| C. | Eight 4 bit shift registers |
| D. | Eight 8 bit shift registers |
| Answer» C. Eight 4 bit shift registers | |
| 414. |
Assertion (A): The data bus and address bus of 8085 are multiplexed. Reason (R): Multiplexing reduces the number of pins. |
| 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 correct R is wrong |
| D. | A is wrong R is correct |
| Answer» B. Both A and R are correct but R is not correct explanation of A | |
| 415. |
Which of the following directives in 8085 causes one byte to be reserved in the memory? |
| A. | D S |
| B. | D B |
| C. | D W |
| D. | E Q U |
| Answer» E. | |
| 416. |
Assertion (A): If contents of F register in 8085 are 01010001, it means S = 0, Z = 1, AC= 1, P = 0 and CY = 1.Reason (R): When an instruction is called from memory, the op. code of instruction is stored in instruction register. |
| 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 correct R is wrong |
| D. | A is wrong R is correct |
| Answer» C. A is correct R is wrong | |
| 417. |
For the infix expression (A/B) * (C * F + (A - D) * E) the corresponding Post fix notation is |
| A. | 5 to 10 KB of main memory |
| B. | 10 to 100 KB of main memory |
| C. | 100 to 256 KB of main memory |
| D. | 256 KB to 1 MB of main memory |
| Answer» C. 100 to 256 KB of main memory | |
| 418. |
Consider the following logical IF statement in FORTRAN 77 IF (SALT. GE. PEPPER) GOTO 11GOTO 13 The above statement using arithmetic IF statement would be |
| A. | IF (SALT - PEPPER) 11, 11, 13 |
| B. | IF (SALT - PEPPER) 13, 11, 13 |
| C. | IF (SALT - PEPPER) 13, 11, 11 |
| D. | IF (SALT - PEPPER) 11, 13, 13 |
| Answer» D. IF (SALT - PEPPER) 11, 13, 13 | |
| 419. |
P flag is for parity. |
| A. | 1 |
| B. | |
| C. | 8 |
| D. | 16 |
| Answer» B. | |
| 420. |
The instruction MOV M, r in 8085 |
| A. | causes content of register r to be moved to memory location whose address is in register H, L and uses register indirect addressing mode |
| B. | causes the content of memory location whose address is in register H, L to move to register r and uses register indirect addressing mode |
| C. | causes the content of register r to be moved to memory location whose address is in register H, L and uses immediate addressing mode |
| D. | causes the content of memory location whose address is in register H, L to move to register r and uses immediate addressing mode |
| Answer» B. causes the content of memory location whose address is in register H, L to move to register r and uses register indirect addressing mode | |
| 421. |
In 8086 |
| A. | the registers SI and DI are used for string operation |
| B. | the registers CS and DS are used for string operation |
| C. | the registers SS and ES are used for string operation |
| D. | the registers SI and SP are used for string operation |
| Answer» B. the registers CS and DS are used for string operation | |
| 422. |
Assertion (A): 1C 74181 is an ALU in TTL 7400 series.Reason (R): 1C 74181 can accept two 4 bit words and can perform any one of possible 16 arithmetic or logic operations. |
| A. | contents of memory location 20 are fetched into the accumulator |
| B. | the value 20 is fetched into accumulator |
| C. | either (a) or (b) |
| D. | neither (a) nor (b) |
| Answer» C. either (a) or (b) | |
| 423. |
In floating point representation decimal number 13.5 is |
| A. | 0.11011 x 24 |
| B. | 11.011 x 22 |
| C. | 7 |
| D. | -1 |
| Answer» D. -1 | |
| 424. |
Consider the following in C An arithmetic operation between integer and an integer gives integer as the result.An arithmetic operation between a real and a real constant gives real constant as the result.An arithmetic operation between an integer constant and a real constant is not valid. Which of the above are correct? |
| A. | 2 and 3 only |
| B. | 1 and 3 only |
| C. | 101100 |
| D. | 10101100 |
| Answer» C. 101100 | |
| 425. |
Java variables are called |
| A. | instance variables, class variables and global variables |
| B. | instance variables, class variables and local variables |
| C. | instance variables, class variables and sector variables |
| D. | global variables, class variables and local variables |
| Answer» C. instance variables, class variables and sector variables | |
| 426. |
Consider the following strings AZ2X3YP12RBX Which of the above strings are valid in Pascal? |
| A. | 1, 2, 4, 5 |
| B. | 1, 2, 3, 5 |
| C. | 1 and 2 only |
| D. | 1, 3 and 4 only |
| Answer» B. 1, 2, 3, 5 | |
| 427. |
A real number consists of |
| A. | integer part |
| B. | integer part and fraction part |
| C. | integer part, fraction part along with positive or negative sign |
| D. | none of the above |
| Answer» D. none of the above | |
| 428. |
Which is a valid Java variable? |
| A. | 1 a b |
| B. | 56 a |
| C. | a 56 |
| D. | 5 a 6 |
| Answer» D. 5 a 6 | |
| 429. |
Diskette can be used for primary storage as well as secondary storage in a computer. |
| A. | 1 |
| B. | |
| C. | 1 and 2 only |
| D. | 1 and 3 only |
| Answer» C. 1 and 2 only | |
| 430. |
In which of the following instructions of 8085 are the contents of accumulator complemented? |
| A. | STC |
| B. | CMC |
| C. | CMA |
| D. | RAL |
| Answer» D. RAL | |
| 431. |
The correct form of expression B3 -2 A C in FORTRAN 77 is |
| A. | B * * 3 - 2 * A * C |
| B. | B * 3 - 2 * A AC |
| C. | B * * 3 - 2 ** A * C |
| D. | B *** 3 - 2 * A * C |
| Answer» B. B * 3 - 2 * A AC | |
| 432. |
In 8085 the instruction MOV A, B is an example of |
| A. | Direct addressing |
| B. | Immediate addressing |
| C. | Register addressing |
| D. | Register indirect addressing |
| Answer» D. Register indirect addressing | |
| 433. |
Assertion (A): A RAM with access time of the order of hundreds of nano seconds is suitable for a control memory.Reason (R): The time taken to execute an operation in a microcomputer is critically de pendent on access time of control memory. |
| A. | A is correct R is wrong |
| B. | A is wrong R is correct |
| C. | b = 5 |
| D. | b > 5 |
| Answer» D. b > 5 | |
| 434. |
A computer window has a bar at its top to bear the name of window. This bar is called |
| A. | title bar |
| B. | status bar |
| C. | menu bar |
| D. | control bar |
| Answer» B. status bar | |
| 435. |
The normalised form of 0.0152 x 1018 is |
| A. | 0.152 x 1017 |
| B. | 1.52 x 1016 |
| C. | 15.2 x 1015 |
| D. | 152 x 1014 |
| Answer» B. 1.52 x 1016 | |
| 436. |
What does the operator ( ) mean in C? |
| A. | Function expression |
| B. | Array expression |
| C. | Structure operator |
| D. | Increment / Decrement |
| Answer» B. Array expression | |
| 437. |
Consider the following statements about DRAM Page mode read operation is faster than RAS readRAS input remains active during column address strobeThe row and column addresses are strobed into the internal buffers using RAS and CAS inputs respectively Which of the above statements are correct? |
| A. | 1 and 3 only |
| B. | All |
| C. | 1 and 2 only |
| D. | 2 and 3 only |
| Answer» C. 1 and 2 only | |
| 438. |
'WRITE' is a |
| A. | Word processor |
| B. | Line editor |
| C. | Text editor |
| D. | Column editor |
| Answer» B. Line editor | |
| 439. |
Assertion (A): In microprocessor 8085 instruction LXIB, 90 FF H means register B and C are loaded with upper and lower bytes to get B = 90 H and C = FFH.Reason (R): In 8085 the stack pointer indicates which memory location is to accessed. |
| 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 correct R is wrong |
| D. | A is wrong R is correct |
| Answer» C. A is correct R is wrong | |
| 440. |
Which of the following assembler directives in 8085 does not cause any memory location to be used μp? |
| A. | D S |
| B. | D B |
| C. | D W |
| D. | E Q U |
| Answer» E. | |
| 441. |
It is difficult to write a program in a machine language. |
| A. | an alphabet followed by dollar sign |
| B. | a digit followed by dollar sign |
| C. | either (a) or (b) |
| D. | neither (a) nor (b) |
| Answer» B. a digit followed by dollar sign | |
| 442. |
For the expression cos (ωt + 0) 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)] | |
| 443. |
Microprocessor 8088 has |
| A. | 8 bit registers and 16 bit data bus |
| B. | 16 bit registers and 8 bit data bus |
| C. | Both A and R are correct and R is correct explanation of A |
| D. | Both A and R are correct but R is not correct explanation of A |
| Answer» E. | |
| 444. |
Which of the following statements are executable in FORTRAN 77? |
| A. | Arithmetic IF |
| B. | Assign |
| C. | Call |
| D. | All of the above |
| Answer» C. Call | |
| 445. |
Consider the following statements about an array in Pascal An array has a fixed predetermined number of components.Any component of an array can be accessed using an index.An array variable name refers to a group of quantities by a single name.When array variables are used an appropriate declaration is required. Which of the above are correct? |
| A. | All |
| B. | 1, 2, 3 only |
| C. | 2, 3, 4 only |
| D. | 1, 2 and 4 only |
| Answer» B. 1, 2, 3 only | |
| 446. |
The expression A ** B / C + D is equivalent to |
| A. | AB / C + D |
| B. | AB / C + D |
| C. | AB / (C + D) |
| D. | None of the above |
| Answer» C. AB / (C + D) | |
| 447. |
Assertion (A): Interfacing means synchronisation of digital information transmission between input output devices and computer.Reason (R): A computer with higher bit word size executes programs at a faster rate. |
| 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 correct R is wrong |
| D. | A is wrong R is correct |
| Answer» C. A is correct R is wrong | |
| 448. |
Assertion (A): Magnetic tape can be accessed only sequentially.Reason (R): Magnetic tape consists of magnetised spots or tracks. |
| 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 correct R is wrong |
| D. | A is wrong R is correct |
| Answer» C. A is correct R is wrong | |
| 449. |
Which of the following arithmetic operations requires only one operand in FORTRAN 77? |
| A. | Addition |
| B. | Multiplication |
| C. | Negative |
| D. | Substraction |
| Answer» D. Substraction | |
| 450. |
The loops ' for , 'while' , 'do-while' are used in |
| A. | Fortran 77 |
| B. | Pascal |
| C. | C |
| D. | none of the above |
| Answer» D. none of the above | |