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.
| 951. |
The dual of A + [B + (AC)] + D is |
| A. | A + [(B (A + C))] + D |
| B. | A [B + AC] D |
| C. | A + [B (A + C)] D |
| D. | A [B (A + C)] D |
| Answer» E. | |
| 952. |
The number of programmable 8 bit registers of 6800 are |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» B. 3 | |
| 953. |
In decimal system the base of radix is |
| A. | 0 |
| B. | 1 |
| C. | 10 |
| D. | e |
| Answer» D. e | |
| 954. |
Which one of the following is loaded in the main memory by the bootstrap loader? |
| A. | System data |
| B. | User program |
| C. | BIOS |
| D. | Part of DOS |
| Answer» E. | |
| 955. |
If the switch is thrown to the START position, Q and Y will be equal to |
| A. | Q = 0, Y = 0 |
| B. | Q= 1, Y= 1 |
| C. | Q = 1, Y = CLK |
| D. | Q = 0, Y = CLK |
| Answer» D. Q = 0, Y = CLK | |
| 956. |
127416 - 3A716 = __________ . |
| A. | ACA16 |
| B. | ACB16 |
| C. | ECD16 |
| D. | AAA16 |
| Answer» D. AAA16 | |
| 957. |
A binary with a digits, all of which are unity has the value |
| A. | n2 - 1 |
| B. | 2n |
| C. | 2(n - 1) |
| D. | 2n - 1 |
| Answer» E. | |
| 958. |
In a BCD to 7 segment decoder the minimum and maximum number of outputs active at any time is |
| A. | 2 and 7 |
| B. | 3 and 7 |
| C. | 1 and 6 |
| D. | 3 and 6 |
| Answer» B. 3 and 7 | |
| 959. |
Computer virus is a piece of rough software of unknown origin that |
| A. | copies itself like a breeding germ |
| B. | spreads from one machine to another |
| C. | eats away processing power |
| D. | all of the above |
| Answer» E. | |
| 960. |
9's complement of 1210 is |
| A. | 2110 |
| B. | 8710 |
| C. | 7810 |
| D. | 7610 |
| Answer» C. 7810 | |
| 961. |
EPROM can be |
| A. | UVPROM |
| B. | EEPROM |
| C. | both UVPROM and EEPROM |
| D. | none of the above |
| Answer» D. none of the above | |
| 962. |
The decimal equivalent of the binary number 10110.0101011101 is |
| A. | 22.24082165 |
| B. | 22.34082168 |
| C. | 22.34082131 |
| D. | 22.34082031 |
| Answer» E. | |
| 963. |
Assertion (A): XOR gate is not universal gate.Reason (R): It is not possible to realize any Boolean function using XOR gates only. |
| 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» B. Both A and R are correct but R is not correct explanation of A | |
| 964. |
Which of the following is the least important consideration while selecting a logic technology? |
| A. | Power dissipation |
| B. | Noise immunity |
| C. | Number of pins |
| D. | Cost |
| Answer» D. Cost | |
| 965. |
In 8085 microprocessor, what is the memory word size? |
| A. | 6 bits |
| B. | 8 bits |
| C. | 12 bits |
| D. | 16 bits |
| Answer» B. 8 bits | |
| 966. |
The circuit shown in figure converts |
| A. | BCD to binary code |
| B. | binary to excess-3 code |
| C. | excess-3 to Gray code |
| D. | gray to binary code |
| Answer» E. | |
| 967. |
For a NAND SR latch of input is the normal resting state of inputs is |
| A. | S = R = 1 |
| B. | S = 0, R = 1 |
| C. | S = 1, R = 0 |
| D. | S = R = 0 |
| Answer» B. S = 0, R = 1 | |
| 968. |
In LIFO |
| A. | only the top of the stack is immediately accessible |
| B. | only the top of the stack is never accessible |
| C. | only the first-in is accessible |
| D. | only the first-in is not accessible |
| Answer» B. only the top of the stack is never accessible | |
| 969. |
Binary number 11001 is equivalent to decimal number |
| A. | 35 |
| B. | 15 |
| C. | 105 |
| D. | 25 |
| Answer» E. | |
| 970. |
While __________ is the fastest unsaturated logic gate __________ has the excellent noise immunity? |
| A. | ECL, TTL |
| B. | TTL, ECL |
| C. | ECL, RTL |
| D. | RTL, DTL |
| Answer» D. RTL, DTL | |
| 971. |
Maxterm designation for A + B + C is |
| A. | M0 |
| B. | M1 |
| C. | M3 |
| D. | M4 |
| Answer» B. M1 | |
| 972. |
The time needed by a TTL circuit to switch from 0 to 1 or 1 to 0 is about |
| A. | 10 μs |
| B. | 10 ns |
| C. | 100 μs |
| D. | 50 ns |
| Answer» C. 100 Œºs | |
| 973. |
"Micro-program" is |
| A. | the name of the source program in microcomputer |
| B. | the set of instructions indicating the primitive operations in 1 system |
| C. | the general name of 'MACRO's' in assembly language programming |
| D. | the name of programs of very small size |
| Answer» C. the general name of 'MACRO's' in assembly language programming | |
| 974. |
In 8085 microprocessor, which of the following interrupts has the highest priority? |
| A. | RST 5.5 |
| B. | RST 7.5 |
| C. | TRAP |
| D. | INTR |
| Answer» D. INTR | |
| 975. |
In TTL the transistors are driven into and out of saturation. |
| A. | 1 |
| B. | |
| C. | ECL |
| D. | TTL |
| Answer» B. | |
| 976. |
A 14 pin AND gate IC has __________ AND gates. |
| A. | 8 |
| B. | 6 |
| C. | 4 |
| D. | 2 |
| Answer» D. 2 | |
| 977. |
The contents of the program counter after the call operation will be |
| A. | (30F0)H |
| B. | (40F0)H |
| C. | (50F0)H |
| D. | (60F0)H |
| Answer» B. (40F0)H | |
| 978. |
The 2's complement representation of the decimal number -4 is |
| A. | 100 |
| B. | 1100 |
| C. | 1011 |
| D. | 1010 |
| Answer» C. 1011 | |
| 979. |
2's complement representation of a 16 bit number (one sign bit and 15 magnitude bit) is FFFF. Its magnitude in decimal representation is |
| A. | 0 |
| B. | 1 |
| C. | 32676 |
| D. | 65, 535 |
| Answer» C. 32676 | |
| 980. |
The number of digits in hexadecimal system |
| A. | 15 |
| B. | 16 |
| C. | 10 |
| D. | 8 |
| Answer» C. 10 | |
| 981. |
In 8085 microprocessor the value of the most significant bit of the result following the execution of any arithmetic or Boolean instruction is stored in |
| A. | the carry status flag |
| B. | the auxiliary carry status flag |
| C. | sign status flag |
| D. | zero status flag |
| Answer» D. zero status flag | |
| 982. |
The circuit shown in the figure is a |
| A. | positive logic OR circuit |
| B. | negative logic OR circuit |
| C. | positive logic AND circuit |
| D. | negative logic AND circuit |
| Answer» B. negative logic OR circuit | |
| 983. |
For a Mod 64 parallel counter we need |
| A. | 6 flip flops |
| B. | 6 flip flops and 2 AND gates |
| C. | 6 flip flops and 4 AND gates |
| D. | none of the above |
| Answer» D. none of the above | |
| 984. |
The first contribution to logic was made by |
| A. | George Boole |
| B. | Copernicus |
| C. | Aristotle |
| D. | Shannon |
| Answer» D. Shannon | |
| 985. |
The circuit realizes the function |
| A. | (A + B) E + CD |
| B. | (A + B) (E + CD) |
| C. | (A + B) (E + C + D) |
| D. | (AB + E). CD |
| Answer» B. (A + B) (E + CD) | |
| 986. |
The dual of the function A(BC + BC + BC) is |
| A. | A + (B + C) (B + C) (B + C) |
| B. | A (BC + BC + BC) |
| C. | C(BA + CA + CA) |
| D. | ABC + ABC + ABC |
| Answer» B. A (BC + BC + BC) | |
| 987. |
In a D-type latch EN = 1, D = 1, the O/P is |
| A. | 1 |
| B. | 0 |
| C. | don't care |
| D. | blocked |
| Answer» B. 0 | |
| 988. |
BCD number 1100111 = __________ 10 |
| A. | 66 |
| B. | 67 |
| C. | 68 |
| D. | 69 |
| Answer» C. 68 | |
| 989. |
Choose the appropriate turn on and turn off time of a FET |
| A. | 1 ns, 10ns |
| B. | 6 ns, 18ns |
| C. | 4 ns, 8 ns |
| D. | 10 ns, 10 ns |
| Answer» C. 4 ns, 8 ns | |
| 990. |
An instruction used to set the carry flag in a computer can be classified as |
| A. | data transfer |
| B. | arithmetic |
| C. | Logical |
| D. | program control |
| Answer» D. program control | |
| 991. |
SSI refers to ICs with |
| A. | less than 12 gates on the same chip |
| B. | less than 8 gates on the same chip |
| C. | less than 6 gates on the same chip |
| D. | less than 3 gates on the same chip |
| Answer» B. less than 8 gates on the same chip | |
| 992. |
If memory chip size is 256 x 1 bits, the number of chips required to make 1 k byte memory is |
| A. | 8 |
| B. | 12 |
| C. | 24 |
| D. | 32 |
| Answer» E. | |
| 993. |
The principal of locality of reference justifies the use of |
| A. | interrupts |
| B. | DMA |
| C. | virtual memory |
| D. | cache memory |
| Answer» E. | |
| 994. |
A depletion type NMOS is operated in enhancement mode. Vp = - 4 volts. For VGS = + 3 volts as VDS is increased, ID becomes nearly constant when Vps equals |
| A. | 1 volt |
| B. | 3 volts |
| C. | 4 volt |
| D. | 7 volts |
| Answer» E. | |
| 995. |
Which of the following bus is used to transfer data from main memory to peripheral device? |
| A. | DMA bus |
| B. | Output bus |
| C. | Input bus |
| D. | Data bus |
| Answer» B. Output bus | |
| 996. |
A pulse stretcher is same as a |
| A. | free running multivibrator |
| B. | bistable multivibrator |
| C. | monostable multivibrator |
| D. | latch |
| Answer» D. latch | |
| 997. |
The clear data and present input of the JK flip-flop are known as |
| A. | direct inputs |
| B. | synchronous inputs |
| C. | indirect inputs |
| D. | either direct inputs or synchronous inputs |
| Answer» E. | |
| 998. |
The logic operations of the two circuits given below are |
| A. | complementary |
| B. | identical |
| C. | entirely different |
| D. | none of these |
| Answer» D. none of these | |
| 999. |
E7F616 = __________ . |
| A. | 60000010 |
| B. | 5938210 |
| C. | 938210 |
| D. | 38210 |
| Answer» C. 938210 | |
| 1000. |
Decimal number 5436 when converted into 9's complement will become |
| A. | 4356 |
| B. | 4653 |
| C. | 4563 |
| D. | 4655 |
| Answer» D. 4655 | |