MCQOPTIONS
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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.
| 801. |
If x = 0.1396 radians, the values of 1 - cos x and 2 sin2 (x / 2) using floating point arithmetic with a 4 digit mantissa are respectively |
| A. | .1000 E - 1 each |
| B. | .9727 E - 2 each |
| C. | .1000 E - 1 and .9727 E - 2 respectively |
| D. | .9727 E - 2 and .1000 E - 1 respectively |
| Answer» D. .9727 E - 2 and .1000 E - 1 respectively | |
| 802. |
For most static RAM the maximum access time is about |
| A. | 1 ns |
| B. | 10 ns |
| C. | 100 ns |
| D. | 1 μs |
| Answer» D. 1 Œºs | |
| 803. |
One T state is precisely equal to one clock period. |
| A. | 1 |
| B. | |
| 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» B. | |
| 804. |
The size of cache memory in most microcomputers is about |
| A. | a few bytes |
| B. | a few kilobytes |
| C. | a few megabytes |
| D. | a few gigabytes |
| Answer» C. a few megabytes | |
| 805. |
The instruction MVI A, 20 in 8085 means |
| A. | contents of memory location 20 are brought into the accumulator |
| B. | the value 20 is brought into accumulator |
| C. | either (a) or (b) |
| D. | neither (a) nor (b) |
| Answer» C. either (a) or (b) | |
| 806. |
In which computer language is 'break' statement used |
| A. | Fortran 77 |
| B. | Pascal |
| C. | C |
| D. | none of the above |
| Answer» D. none of the above | |
| 807. |
Consider the following statements about expressing real constants in exponential form in CThe mantissa and exponent are separated either by e or E.The mantissa and exponent may have positive or negative sign.Default sign of mantissa is positive.Default sign of exponent is negative. Which of the above statements are wrong? |
| A. | 1 only |
| B. | 1 and 4 only |
| C. | 1, 3 and 4 only |
| D. | 4 only |
| Answer» C. 1, 3 and 4 only | |
| 808. |
Assume that x = 5 and y = 2. Then in Java operation x + = y, the result is |
| A. | x = 7 |
| B. | x = 2 |
| C. | x = 3 |
| D. | x = 2 |
| Answer» B. x = 2 | |
| 809. |
In which of the following 8085 instructions is the 8 bit number in accumulator adjusted to form two four bit BCD numbers |
| A. | DAD rp |
| B. | DAA |
| C. | DCX rp |
| D. | ADC M |
| Answer» B. DAA | |
| 810. |
Which of the following is not a data base function? |
| A. | DAVERAGE |
| B. | MAX |
| C. | DCOUNT |
| D. | DSTDEV |
| Answer» C. DCOUNT | |
| 811. |
Assertion (A): If source and destination addresses are made implicit the length of instruction is reduced.Reason (R): 8085 has only 3 addressing modes. |
| 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» D. A is wrong R is correct | |
| 812. |
IC (instruction cycle), FC (fetch cycle) and EC (executive cycle) are related as |
| A. | IC = FC - EC |
| B. | IC = FC + EC |
| C. | IC = FC + 2EC |
| D. | EC = IC + EC |
| Answer» C. IC = FC + 2EC | |
| 813. |
The 8085 instruction 'PUSH PSW' belongs to the group |
| A. | data transfer |
| B. | arithmetic |
| C. | logic |
| D. | none of the above |
| Answer» E. | |
| 814. |
The number of select lines in ALU 1C 74181 is |
| A. | 2 |
| B. | 4 |
| C. | 8 |
| D. | 16 |
| Answer» C. 8 | |
| 815. |
Which of the following buses does not exist in 8085? |
| A. | Data bus |
| B. | Address bus |
| C. | Control bus |
| D. | Exchange bus |
| Answer» E. | |
| 816. |
Assertion (A): PC-XT is a personal computer.Reason (R): PC-XT uses a floppy drive and has a medium sized hard disc. |
| 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 | |
| 817. |
In 8085, the instruction CMA is an example of |
| A. | Implict addressing |
| B. | Direct addressing |
| C. | Register addressing |
| D. | Immediate addressing |
| Answer» B. Direct addressing | |
| 818. |
Assertion (A): A two byte instruction of 8085 has an operation code in first byte and operand / address in the second byte.Reason (R): If an instruction is too long it is possible to reduce its length by a number of methods. |
| 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 | |
| 819. |
A nibble corresponds to |
| A. | 2 successive bits of data |
| B. | 4 successive bits of data |
| C. | 8 successive bits of data |
| D. | 16 successive bits of data |
| Answer» C. 8 successive bits of data | |
| 820. |
Java's syntax is based on |
| A. | C |
| B. | C + + |
| C. | Fortran 77 |
| D. | Pascal |
| Answer» C. Fortran 77 | |
| 821. |
Plug and play is a hardware specification. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 822. |
Which of the following DO statements is invalid in FORTRAN 77? |
| A. | DO 161 = 1, 15 |
| B. | DO 16 1 = 1, 10, 1 |
| C. | DO 16 I = - 5, 5, 2 |
| D. | none of the above |
| Answer» E. | |
| 823. |
An advantage of memory interlacing is that |
| A. | a larger memory is obtained |
| B. | effective speed of memory is increased |
| C. | cost of memory is reduced |
| D. | a non-volatile memory is obtained |
| Answer» C. cost of memory is reduced | |
| 824. |
During processing the instructions, data, intermediate results and final results in a computer are held in |
| A. | CPU |
| B. | ALU |
| C. | Primary memory |
| D. | Secondary memory |
| Answer» D. Secondary memory | |
| 825. |
Read the following statements as regards register pairs in microprocessor 8085B represents B, C pair with B as high order register and C as low order register.D represents D, E pair with D as high order register and E as low order register.H represents H, L pair with H as high order register and L as low order register. Which of the above statements are correct? |
| A. | All |
| B. | 1 and 3 |
| C. | 1 and 2 |
| D. | 2 and 3 only |
| Answer» B. 1 and 3 | |
| 826. |
In 8085 the term 'absolute addressing' means |
| A. | Direct addressing |
| B. | Immediate addressing |
| C. | Register addressing |
| D. | Register indirect addressing |
| Answer» B. Immediate addressing | |
| 827. |
In 8085 the time required to add two 32 bit numbers is (if clock frequency is 5 MHz) |
| A. | about 1 ns |
| B. | about 1 μs |
| C. | about 30 μs |
| D. | about 100 μs |
| Answer» D. about 100 Œºs | |
| 828. |
The timing difference between a slow memory and fast processor can be resolved if |
| A. | processor is capable of waiting |
| B. | external buffer is used |
| C. | either (a) or (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 829. |
Which of the following is a valid integer variable in Fortran 77? |
| A. | KM |
| B. | K M - 1 |
| C. | DELHI |
| D. | $ 318 |
| Answer» B. K M - 1 | |
| 830. |
LPEPSI = 22PEPSI = LPEPSI * LPEPSI + 1GOT TO (3, 5, 9, 11, 13, 17, 21, 23) LPEPSI After the execution of above statement the control is transferred to statement number |
| A. | 3 |
| B. | 9 |
| C. | 13 |
| D. | 23 |
| Answer» D. 23 | |
| 831. |
Consider the following logical IF statement in Fortran 77 IF (SALT. LE. PEPPER) 11GO TO 13 The above statement using arithmetic IF statement would be |
| A. | IF (SALT - PEPPER) 11, 11, 13 |
| B. | IF (SALT - PEPPER) 13, 11, 11 |
| C. | IF (SALT - PEPPER) 13, 13, 11 |
| D. | IF (SALT - PEPPER) 11, 13, 13 |
| Answer» B. IF (SALT - PEPPER) 13, 11, 11 | |
| 832. |
Assertion (A): In direct addressing the address of operand is specified in the instruction.Reason (R): Direct addressing is also called absolute addressing. |
| 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 | |
| 833. |
Read the following statements about Excel It supports many arithmetic functions like SUM, ABS, EXP, INT, MOD etc.It supports many trigonometric functions.It supports IRR function to calculate interest rate.It supports PV function to calculate the present value of future receipts. Which of the above are correct? |
| A. | All |
| B. | 1, 2 and 3 only |
| C. | 1, and 2 only |
| D. | 1 only |
| Answer» B. 1, 2 and 3 only | |
| 834. |
Read the following statement Multi-processing operation permits highly efficient parallel processing at several levels.Multi processing involves use of several processing units jointly on a common program and severally on different programs.In multi-processing the assignment of facilities to tasks, loading of programs and monitoring of I/O activity is taken care of by operating system. Which of the above are correct? |
| A. | All |
| B. | 1 and 2 only |
| C. | 1 and 3 only |
| D. | 2 and 3 only |
| Answer» B. 1 and 2 only | |
| 835. |
Consider the following mnemonics MOVADDLXI Which of the above are valid for 8085? |
| A. | 1 and 2 only |
| B. | 1 only |
| C. | 1, 2 and 3 |
| D. | 1 and 3 only |
| Answer» D. 1 and 3 only | |
| 836. |
The number of storage classes in C is |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 6 |
| Answer» D. 6 | |
| 837. |
DMA stands for |
| A. | Direct Memory Address |
| B. | Distributed Memory Address |
| C. | Direct Memory Accumulator |
| D. | Decimal Machine Address |
| Answer» B. Distributed Memory Address | |
| 838. |
Initially the number decimal 8 is stored. If instruction RAL is executed twice, the final number stored will be |
| A. | decimals 8 |
| B. | decimal 16 |
| C. | decimal 32 |
| D. | decimal 2 |
| Answer» D. decimal 2 | |
| 839. |
The word size accessible at a time from the memory subsystem depends on |
| A. | width of data bus |
| B. | width of address bus |
| C. | width of control bus |
| D. | both (b) and (c) |
| Answer» B. width of address bus | |
| 840. |
Consider the following rules for constructing variable names in C It can have alphabets, digits or underscores but no other special character.The maximum number of characters is 8.The first character may be an alphabet or digit but not underscore. Which of the above are correct? |
| A. | All |
| B. | 1 and 2 only |
| C. | 1 and 3 only |
| D. | 2 and 3 only |
| Answer» C. 1 and 3 only | |
| 841. |
Consider the following program for 8085 MVIA, 00HLXIH, OEAOFG V LDAZ ADI 0005H What does this program do? |
| A. | Adds decimal number 5 to contents of memory |
| B. | Subtracts decimal number 5 from contents of memory |
| C. | Subtracts decimal number 15 from contents of memory |
| D. | Adds decimal number 15 to contents of memory |
| Answer» B. Subtracts decimal number 5 from contents of memory | |
| 842. |
The number of primitive string operations in 8086 is |
| A. | 3 |
| B. | 4 |
| C. | 5 |
| D. | 6 |
| Answer» D. 6 | |
| 843. |
Which of the following statements is non-executable in FORTRAN 77? |
| A. | DO |
| B. | ASSIGN |
| C. | END |
| D. | DIMENSION |
| Answer» E. | |
| 844. |
Which of the following computer memories is fastest? |
| A. | Cache |
| B. | Primary |
| C. | Mass storage |
| D. | Off line back up |
| Answer» B. Primary | |
| 845. |
8255 A is a |
| A. | programmable peripheral interface |
| B. | I/O device |
| C. | memory chip |
| D. | none of the above |
| Answer» B. I/O device | |
| 846. |
Assertion (A): Dynamic RAM needs refreshing. Reason (R): Capacitors tend to loose charge. |
| 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 | |
| 847. |
Assertion (A): In microprocessor 8085 DMA allows direct access to memory to speed up data transfer.Reason (R): HOLD and HLDA signals are used for DMA operations. |
| 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 | |
| 848. |
If J = 12 and X = 24.4 the result of the following FORTRAN 77 program will be READ *, J, XK = J ** 2Z = 3 * XPrint *, J, K, Z |
| A. | 12, 144, 73.2 |
| B. | 15.0, 144.0, 73.2 |
| C. | 15.0, 144.0, 73 |
| D. | 15. 144. 73 |
| Answer» B. 15.0, 144.0, 73.2 | |
| 849. |
Which of the following is not a key word in C? |
| A. | pop |
| B. | for |
| C. | if |
| D. | union |
| Answer» B. for | |
| 850. |
Which group of instructions is used to change sequence of operations in a computer program? |
| A. | Data transfer group |
| B. | Branch group |
| C. | Arithmetic group |
| D. | Logic group |
| Answer» C. Arithmetic group | |