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.
| 1201. |
The recently-introduces CD-ROM PC by Head Start Technologies Co. of New York enables users to view or play __________ . |
| A. | vast amounts of text |
| B. | graphics |
| C. | music |
| D. | all of the above |
| Answer» E. | |
| 1202. |
Which display device resembles vacuum tube? |
| A. | LED |
| B. | LCD |
| C. | VF |
| D. | None of these |
| Answer» D. None of these | |
| 1203. |
Four inputs A, B, C, D are fed to a NOR gate. The output of NOR gate is fed to an inverter. The output of inverter is |
| A. | A + B + C + D |
| B. | A + B + C + D |
| C. | ABCD |
| D. | ABCD |
| Answer» B. A + B + C + D | |
| 1204. |
In a gate output is Low if and only if all inputs are High. The gate is |
| A. | OR |
| B. | AND |
| C. | NOR |
| D. | NAND |
| Answer» E. | |
| 1205. |
The 2732 is 4096 x 8 EPROM. How many address lines does it have? |
| A. | 12 |
| B. | 24 |
| C. | 50 |
| D. | 100 |
| Answer» B. 24 | |
| 1206. |
Which material is generally used for LED? |
| A. | Compounds of silica |
| B. | Compounds of gallium |
| C. | Compounds of phosphorus |
| D. | Compounds of sulphur |
| Answer» C. Compounds of phosphorus | |
| 1207. |
In 8085, to disable the whole interrupt system (except TRAP) |
| A. | the DI instruction may be used |
| B. | the DO instruction may be used |
| C. | the INTERRUPT instruction may be used |
| D. | the El instruction may be used |
| Answer» B. the DO instruction may be used | |
| 1208. |
A multiple emitter transistor has many emitters and collectors. |
| A. | 1 |
| B. | |
| C. | 10 |
| D. | 100 |
| Answer» C. 10 | |
| 1209. |
The basic storage element in a digital system is |
| A. | flip flop |
| B. | counter |
| C. | multiplexer |
| D. | encoder |
| Answer» B. counter | |
| 1210. |
The main advantage of hexadecimal numbers is |
| A. | ease of conversion from hexadecimal to binary and vice-versa |
| B. | ease of conversion from hexadecimal to decimal and vice-versa |
| C. | ease of conversion from gray code to binary and vice-versa |
| D. | the use of numbers and alphabets |
| Answer» B. ease of conversion from hexadecimal to decimal and vice-versa | |
| 1211. |
Which of the following correctly declares a pointer to an array of intergers in C? |
| A. | int * P [20] |
| B. | int * P |
| C. | int (* P) [20] |
| D. | int * (P [20]) |
| Answer» D. int * (P [20]) | |
| 1212. |
The expression Y (A, B, C) = ‚àëm (1, 3, 5, 6) is to realized using a multiplexer. Then |
| A. | use 8 : 1 multiplexer and ground input lines 1, 3, 5, 6 |
| B. | use 8 : 1 multiplexer and ground input lines 0, 2, 4, 7 |
| C. | use 8 : 1 multiplexer and ground input lines 0, 1, 2, 3 |
| D. | use 8 : 1 multiplexer and ground input lines 4, 5, 6, 7 |
| Answer» C. use 8 : 1 multiplexer and ground input lines 0, 1, 2, 3 | |
| 1213. |
Assertion (A): TTL is a very popular logic in SSI and MSI category.Reason (R): In Schottky TTL the power dissipation is less than in ordinary TTL. |
| 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» D. A is false, R is true | |
| 1214. |
The inputs to a 4 channel MUX have the following bandwidths. Channel 1-50 Hz, channel 2-200 Hz. Channel 3-75 Hz. Channel 4-90 Hz. The theoretical minimum sampling rate of the MUX is |
| A. | 200 Hz |
| B. | 400 Hz |
| C. | 415 Hz |
| D. | 1600 Hz |
| Answer» E. | |
| 1215. |
In which function is each term known as maxterm? |
| A. | SOP |
| B. | POS |
| C. | Hybrid |
| D. | SOP and Hybrid |
| Answer» C. Hybrid | |
| 1216. |
The write cycle time of memory is 200 nsec. The maximum rate of data which can be stored is |
| A. | 200 words/sec |
| B. | 5 x 103 words/sec |
| C. | 5 x 106 word/sec |
| D. | 5 x 109 words/sec |
| Answer» D. 5 x 109 words/sec | |
| 1217. |
Which of the following characteristics is not true for TTL Logic? |
| A. | Good speed |
| B. | Low power dissipation per gate |
| C. | High cost |
| D. | None of these |
| Answer» D. None of these | |
| 1218. |
Consider the following statements: Race around condition can occur in JK flip flop when both inputs are 1A flip flop is used to store one bit of informationA transparent latch is a D type flip flopMaster slave flip flop is used to store two bits of information Which of the above are correct? |
| A. | 1, 2, 3 |
| B. | 1, 3, 4 |
| C. | 1, 2, 4 |
| D. | 2, 3, 4 |
| Answer» E. | |
| 1219. |
In 8085 microprocessor, what is the memory word addressing capability? |
| A. | 32 K |
| B. | 64 K |
| C. | 256 K |
| D. | 512 K |
| Answer» C. 256 K | |
| 1220. |
Assertion (A): The output of a NOR gate is equal to the complement of OR of input variables. Reason (R): A XOR gate is a universal gate. |
| 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» D. A is false, R is true | |
| 1221. |
Which of the following can provide a digital signal? |
| A. | Slow change in the value of a resister |
| B. | Sine wave |
| C. | Square wave |
| D. | Gradual turning of a potentiometer |
| Answer» D. Gradual turning of a potentiometer | |
| 1222. |
A memory system of size 16 k bytes is to be designed using memory chips which have 12 address lines and 4 data lines each. The number of such chips required to design the memory system is |
| A. | 2 |
| B. | 4 |
| C. | 8 |
| D. | 18 |
| Answer» D. 18 | |
| 1223. |
Hexadecimal number E is equal to binary number |
| A. | 1110 |
| B. | 1101 |
| C. | 1001 |
| D. | 1111 |
| Answer» B. 1101 | |
| 1224. |
A 4 bit counter with four flip-flops will count upto decimal |
| A. | 8 |
| B. | 15 |
| C. | 31 |
| D. | 63 |
| Answer» C. 31 | |
| 1225. |
A 4 bit ripple counter is in 0000 state. The clock pulses are applied and then removed. The counter reads 0011. The number of clock pulses which have occurred are |
| A. | 3 |
| B. | 3 or 19 |
| C. | 3 or 19 or 35 |
| D. | none of the above |
| Answer» D. none of the above | |
| 1226. |
In the expression A + BC, the total number of minterms will be |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» E. | |
| 1227. |
As access time is decreased, the cost of memory |
| A. | remains the same |
| B. | increases |
| C. | decreases |
| D. | may increase or decrease |
| Answer» C. decreases | |
| 1228. |
In 8085 microprocessor, an interrupt service request is serviced |
| A. | immediately on receipt of request |
| B. | after the execution of the current instruction is completed |
| C. | at the end of the current machine cycle |
| D. | none |
| Answer» C. at the end of the current machine cycle | |
| 1229. |
How many zone bits are there?The 8156 of a figure has RAM locations from 2000 H to 20 FFH. |
| A. | 2 |
| B. | 4 |
| C. | 8 |
| D. | 16 |
| Answer» D. 16 | |
| 1230. |
The number of switching functions of 3 variables are |
| A. | 3 |
| B. | 8 |
| C. | 16 |
| D. | 32 |
| Answer» C. 16 | |
| 1231. |
A mod-10 counter can divide the clock frequency by a factor of |
| A. | 10 |
| B. | 20 |
| C. | 210 |
| D. | 102 |
| Answer» B. 20 | |
| 1232. |
NAND and NOR gates are universal gates. |
| A. | 1 |
| B. | |
| C. | two flip-flop & 2 x 4 decoder are needed |
| D. | four flip-flop & 2 x 4 decoder are needed |
| Answer» B. | |
| 1233. |
Which of these are universal gates? |
| A. | Only NOR |
| B. | Only NAND |
| C. | Both NOR and NAND |
| D. | NOR, NAND, OR |
| Answer» D. NOR, NAND, OR | |
| 1234. |
Commercial ECL gates use two ground lines and one negative supply to |
| A. | reduce power consumption |
| B. | increase fan out |
| C. | reduce loading effect |
| D. | eliminate the effect of power line glitches on the biasing circuit |
| Answer» E. | |
| 1235. |
In a T flip-flop the output frequency is |
| A. | same as input frequency |
| B. | half of I/p frequency |
| C. | double the input frequency |
| D. | none |
| Answer» C. double the input frequency | |
| 1236. |
Decimal number 10 is equal to binary number |
| A. | 1110 |
| B. | 1010 |
| C. | 1001 |
| D. | 1000 |
| Answer» C. 1001 | |
| 1237. |
An AND gate has two inputs A and B and one inhibit input 3, Output is 1 if |
| A. | A = 1, B = 1, S = 1 |
| B. | A = 1, B = 1, S = 0 |
| C. | A = 1, B = 0, S = 1 |
| D. | A = 1, B = 0, S = 0 |
| Answer» C. A = 1, B = 0, S = 1 | |
| 1238. |
A decade counter |
| A. | counts for ten days |
| B. | counts ten times faster than a binary counters |
| C. | counts to 9 and reset on the next pulse |
| D. | reverts on the pulse after the tenth |
| Answer» D. reverts on the pulse after the tenth | |
| 1239. |
Assertion (A): In a parallel in-serial out shift register data is loaded one bit-at a timeReason (R): A serial in-serial out shift register can be used to introduce a time delay. |
| 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» E. | |
| 1240. |
The number of distinct Boolean expression of 4 variables is |
| A. | 16 |
| B. | 256 |
| C. | 1024 |
| D. | 65536 |
| Answer» E. | |
| 1241. |
Octal number 12 is equal to decimal number |
| A. | 8 |
| B. | 9 |
| C. | 10 |
| D. | 11 |
| Answer» D. 11 | |
| 1242. |
The subtraction of a binary number Y from another binary number X, done by adding the 2's complement of Y to X results in a binary number without overflow. This implies that the result is |
| A. | #NAME? |
| B. | -ve and 2's complement form |
| C. | #NAME? |
| D. | +ve and in 2's complement |
| Answer» E. | |
| 1243. |
What is the direction of control bus? |
| A. | Unidirection into μp |
| B. | Unidirection out of up |
| C. | Bidirectional |
| D. | Mixed direction i.e., some lines into μp and some other out of μp |
| Answer» E. | |
| 1244. |
Consider the followings statements: A multiplier selects one of the several inputs and steers it to the outputroutes the data from a single input to many outputsconverts parallel data into serial datais a combinational circuit On the above statements which are correct? |
| A. | 1, 2, 4 |
| B. | 2, 3, 4 |
| C. | 1, 3, 4 |
| D. | 1, 2, 3 |
| Answer» D. 1, 2, 3 | |
| 1245. |
2's complement of binary number 0101 is |
| A. | 1011 |
| B. | 1111 |
| C. | 1101 |
| D. | 1110 |
| Answer» B. 1111 | |
| 1246. |
The access time of a word in 4 MB main memory is 100 ms. The access time of a word in a 32 kb data cache memory is 10 ns. The average data cache bit ratio is 0.95. The efficiency of memory access time is |
| A. | 9.5 ns |
| B. | 14.5 ns |
| C. | 20 ns |
| D. | 95 ns |
| Answer» C. 20 ns | |
| 1247. |
7BF16 = __________ 2 |
| A. | 0111 1011 1110 |
| B. | 0111 1011 1111 |
| C. | 0111 1011 0111 |
| D. | 0111 1011 0011 |
| Answer» C. 0111 1011 0111 | |
| 1248. |
High speed counter |
| A. | ring counter |
| B. | ripple counter |
| C. | synchronous counter |
| D. | asynchronous counter |
| Answer» D. asynchronous counter | |
| 1249. |
A full adder adds |
| A. | 2 bits |
| B. | 3 bits |
| C. | 4 bits |
| D. | any number of bits |
| Answer» C. 4 bits | |
| 1250. |
A buffer is a device that isolates other devices. Typically a buffer has |
| A. | a high input impedance and a low output impedance |
| B. | a high input impedance as well as output impedance |
| C. | a low input impedance and a high output impedance |
| D. | a low input impedance as well as output impedance |
| Answer» B. a high input impedance as well as output impedance | |