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MCQOPTIONS
This section includes 9294 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 851. |
A microprocessor needs memory chips and input-output chip to form a microcomputer. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 852. |
Which one is true for writing array variable in Pascal? |
| A. | The general form of an array variable is an integer or a real variable name followed by subscripts enclosed within square brackets. The subscripts are separated by commas |
| B. | The general form of an array variable must be an integer name followed by subscripts enclosed within square brackets. The subscripts are separated by commas |
| C. | The subscripts in array variable must be separated by dots |
| D. | The subscripts must be enclosed within parenthesis |
| Answer» B. The general form of an array variable must be an integer name followed by subscripts enclosed within square brackets. The subscripts are separated by commas | |
| 853. |
For converting a decimal number into octal number, the decimal number is expressed as a series of the type |
| A. | <img src="/_files/images/electronics-and-communication-engineering/microprocessors/39-493-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/microprocessors/39-493-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/microprocessors/39-493-3.png"> |
| D. | None of the above |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/microprocessors/39-493-2.png"> | |
| 854. |
Consider the following statements The sign of a floating point number depends on the sign of mantissa only.If the absolute value of a number is less than 1, the sign of exponent is zero or positive.With sign bit of mantissa as 0, increasing the exponent from a positive to a more positive value gives a larger floating point number. Which of the above are correct? |
| A. | All |
| B. | 1 and 2 only |
| C. | 1 and 3 only |
| D. | 2 and 3 only |
| Answer» D. 2 and 3 only | |
| 855. |
To add 8 bit words, two IC 74181 can be cascaded. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 856. |
In 8085, which of the following is an 8 bit register? |
| A. | A |
| B. | SP |
| C. | PC |
| D. | both (a) and (b) |
| Answer» B. SP | |
| 857. |
Virus is a |
| A. | computer hardware problem |
| B. | an operating system |
| C. | a computer program |
| D. | a computer language |
| Answer» D. a computer language | |
| 858. |
In a multi-processor configuration two coprocessors are connected to host 8086 processor. The instruction sets of the two coprocessors |
| A. | must be same |
| B. | may overlap |
| C. | must be disjoint |
| D. | must be the same as that of host |
| Answer» E. | |
| 859. |
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 | |
| 860. |
Internally the two distinct units of 8086 are called |
| A. | bus interface unit and execution unit |
| B. | command unit and follow unit |
| C. | master unit and slave unit |
| D. | memory unit and operation unit |
| Answer» B. command unit and follow unit | |
| 861. |
Consider the following statements about constants in 8085 The assembler treats 64 H as hexadecimal constant.The assembler treats 154 as binary constant.The assembler treats 540 as octal constant.The assembler treats 138 as decimal constant. Which of the above are correct? |
| A. | 1, 2 and 3 only |
| B. | 1, 3 and 4 only |
| C. | 1 and 3 only |
| D. | 2 and 4 only |
| Answer» C. 1 and 3 only | |
| 862. |
Windows can run several tasks simultaneously. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 863. |
In which of the following logical group instructions of 8085 is the addressing mode 'immediate'? |
| A. | <code>ANA <i>r</i></code> |
| B. | <code>ANA M</code> |
| C. | <code>ANI data</code> |
| D. | <code>XRA <i>r</i></code> |
| Answer» D. <code>XRA <i>r</i></code> | |
| 864. |
In which of the following instructions of 8085 are the contents of accumulator complemented? |
| A. | <code>STC</code> |
| B. | <code>CMC</code> |
| C. | <code>CMA</code> |
| D. | <code>RAL</code> |
| Answer» D. <code>RAL</code> | |
| 865. |
Assertion (A): Microprocessors 8086 and 8088 are very similar in organisation and have identical instruction sets.Reason (R): If clock speed is same the execution time of 8088 and 8086 are exactly equal. |
| 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 | |
| 866. |
In a computer MPU is the centre of all operations and control. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 867. |
Which data transfer scheme is used when large block of data is to be transferred in a computer? |
| A. | DMA |
| B. | Programmed data transfer |
| C. | Either (a) or (b) |
| D. | Neither (a) nor (b) |
| Answer» B. Programmed data transfer | |
| 868. |
A computer memory is an ordered sequence of storage cells. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 869. |
The maximum number of alphabets/digits or special symbots for character constants in C is |
| A. | 1 |
| B. | 2 |
| C. | 4 |
| D. | 8 |
| Answer» B. 2 | |
| 870. |
Windows automatically starts CD player when one inserts audio CD in CD-ROM drive. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 871. |
In 8086 the word address is |
| A. | the address of the least significant byte |
| B. | the address of most significant byte |
| C. | either (a) or (b) depending on the word |
| D. | neither (a) nor (b) |
| Answer» B. the address of most significant byte | |
| 872. |
In Pascal an array declaration provides information to the Pascal processor to enable it to |
| A. | identify the variable as an array name |
| B. | reserve memory locations to store all the components of array |
| C. | check the values computed for subscripts expressions during program execution with the specified lower and upper limits of subscripts |
| D. | all of the above |
| Answer» E. | |
| 873. |
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. | 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 | |
| 874. |
The instruction LDA 20 in 8085 means |
| 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» B. the value 20 is fetched into accumulator | |
| 875. |
Intel 2004 is a |
| A. | ROM |
| B. | Volatile RAM |
| C. | NV RAM |
| D. | None of the above |
| Answer» D. None of the above | |
| 876. |
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. | 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 | |
| 877. |
Which of the following 8 bit microprocessors has maximum addressing modes? |
| A. | 8085 |
| B. | Z 80 |
| C. | 6800 |
| D. | 6809 |
| Answer» E. | |
| 878. |
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 | |
| 879. |
Consider the real expression in Pascal language ((X * Z) + Y/(M * P + K) + X)/Y + Y) What would be evaluated first |
| A. | <code>XZ and MP + K</code> |
| B. | <code>XZ + Y and MP + K</code> |
| C. | <code>(MP + K + X) / Y </code> |
| D. | <code>Y / (MP + K)</code> |
| Answer» B. <code>XZ + Y and MP + K</code> | |
| 880. |
8 bit data can have 256 numbers ranging from 00000000 to 111 111 11. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 881. |
Which of these are 16 bit microprocessors? |
| A. | 80286 |
| B. | MC68000 |
| C. | Z8000 |
| D. | All |
| Answer» E. | |
| 882. |
In which of the following 8085 instructions are all condition flags except CY affected? |
| A. | <code>INR <i>r</i></code> |
| B. | <code>SEE M</code> |
| C. | <code>ACI data</code> |
| D. | <code>ADC<i> r</i></code> |
| Answer» B. <code>SEE M</code> | |
| 883. |
Assertion (A): In C it is possible for functions to call themselves.Reason (R): C makes use of 'Pointers'. |
| 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 | |
| 884. |
In IC 74181 a sum greater than 15 leads to low carry out. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 885. |
Assertion (A): In 8085, the zero flag is set when ALU operation results in 0. If the result is not 0, this flag is reset.Reason (R): In 8085 the S flag is set when the contents of accumulator become negative during execution of an instruction. |
| 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» E. | |
| 886. |
The operations which occur most frequently in a computer are |
| A. | fetch |
| B. | execute |
| C. | both (a) and (b) |
| D. | none of the above |
| Answer» D. none of the above | |
| 887. |
The addressing mode depicted in the given figure is |
| A. | direct |
| B. | register |
| C. | register indirect |
| D. | immediate |
| Answer» D. immediate | |
| 888. |
The signals in 8086 are classified into |
| A. | minimum mode and maximum mode |
| B. | decrement mode and increment mode |
| C. | low mode and high mode |
| D. | none of the above |
| Answer» B. decrement mode and increment mode | |
| 889. |
In a microprocessor the clock signal |
| A. | is always generated internally |
| B. | is always supplied externally |
| C. | may be generated internally or supplied externally |
| D. | is mostly supplied externally |
| Answer» D. is mostly supplied externally | |
| 890. |
Which of the following identifiers is invalid in Pascal? |
| A. | <code> BETA</code> |
| B. | <code>MAX 40</code> |
| C. | <code>2ND</code> |
| D. | <code>A MAX</code> |
| Answer» D. <code>A MAX</code> | |
| 891. |
Computers 'Basic input output system' is generally stored in RAM chips. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 892. |
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 | |
| 893. |
The operator precedence in Java is in the order |
| A. | arithmetic operation, increment and decrement operation, comprassion, logical operation and assignment operation. |
| B. | increment and decrement operation, arithmetic operation, comparison, logical operation and assignment operation. |
| C. | comparison, arithmetic operation, increment and decrement operation, logical operation and assignment operation. |
| D. | arithmetic operation, comparison operation, increment and decrement operation, logical operation and assignment operation. |
| Answer» C. comparison, arithmetic operation, increment and decrement operation, logical operation and assignment operation. | |
| 894. |
A colour monitor usign 16 bits at a resolution of 600 x 400 pixels needs a memory of |
| A. | 240000 B |
| B. | 9600 B |
| C. | 6400 B |
| D. | 480000 B |
| Answer» E. | |
| 895. |
Assertion (A): A PROM is a user programmable ROM.Reason (R): After programming PROM behaves like ROM. |
| 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 | |
| 896. |
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 | |
| 897. |
The 8085 instruction 'PUSH PSW' belongs to the group |
| A. | data transfer |
| B. | arithmetic |
| C. | logic |
| D. | none of the above |
| Answer» E. | |
| 898. |
Which of the following is not a valid real constant? |
| A. | -73.1 |
| B. | 10251,3 |
| C. | 10.23 |
| D. | -5.7381 |
| Answer» C. 10.23 | |
| 899. |
When we use RRC instruction once in 8085, the number is |
| A. | multiplied by 2 |
| B. | divided by 2 |
| C. | multiplied by 4 |
| D. | divided by 4 |
| Answer» C. multiplied by 4 | |
| 900. |
Read the following statements about sets If A and B are sets then A + B denotes union of sets A and B.The union of A and B is that set whose elements are in either A or B or both.If A and B are sets, then difference of sets A and B is denoted by A - B.A - B in the set obtained by removing elements of A from B. Which of the above are true? |
| A. | All |
| B. | 1, 2 and 3 only |
| C. | 2 and 3 only |
| D. | 1 and 4 only |
| Answer» B. 1, 2 and 3 only | |