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MCQOPTIONS
This section includes 287 Mcqs, each offering curated multiple-choice questions to sharpen your Computer Science knowledge and support exam preparation. Choose a topic below to get started.
| 251. |
Conversion of a octal number 638 to its decimal number is |
| A. | 5110 |
| B. | 6110 |
| C. | 5710 |
| D. | 5310 |
| Answer» B. 6110 | |
| 252. |
Express -7 as 16-bit signed binary numbers. |
| A. | 0000 0000 0000 0111 |
| B. | 1000 0000 0000 0111 |
| C. | . 0111 0000 0000 0001 |
| D. | 0111 0000 0000 0000 |
| Answer» C. . 0111 0000 0000 0001 | |
| 253. |
Conversion of an octal number 1108 to its decimal number is |
| A. | 7010 |
| B. | 7210 |
| C. | 7310 |
| D. | 11010 |
| Answer» C. 7310 | |
| 254. |
De Morgan's second therm says that NAND gate is equivalent to a bubbled _____ gate. |
| A. | AND |
| B. | XAND |
| C. | XOR |
| D. | OR |
| Answer» E. | |
| 255. |
_____is an abbreviation for binary digit. |
| A. | 0 and 1 |
| B. | bingit |
| C. | base |
| D. | bit |
| Answer» E. | |
| 256. |
Conversion of binary number 11000112 to hexadecimal is |
| A. | 6316 |
| B. | 5716 |
| C. | 4616 |
| D. | 4016 |
| Answer» B. 5716 | |
| 257. |
Which of the following flip-flops is free from race around problem? |
| A. | T flip-flop |
| B. | SR flip-flop |
| C. | master slave JK flip-flop |
| D. | All of the above |
| Answer» D. All of the above | |
| 258. |
The 2's compliment of binary number 010111.1100 is |
| A. | 101001.11 |
| B. | 101000.01 |
| C. | 10111.0011 |
| D. | 101000.0011 |
| Answer» C. 10111.0011 | |
| 259. |
The ASCII |
| A. | is a subset of 8-bit EBCDIC |
| B. | is used only in Western Countries |
| C. | is version II of the ASC Standard |
| D. | has 128 characters, including 32 control characters |
| Answer» E. | |
| 260. |
How many bytes are there in 1011 1001 0110 1110 numbers? |
| A. | 1 |
| B. | 2 |
| C. | 4 |
| D. | 8 |
| Answer» C. 4 | |
| 261. |
When a transistor is cut off or saturated, transistor _____ have almost no effect |
| A. | wave |
| B. | variations |
| C. | stage |
| D. | circuits |
| Answer» C. stage | |
| 262. |
Conversion of an octal number 1438 to its decimal number is |
| A. | 9010 |
| B. | 97110 |
| C. | 9910 |
| D. | 10710 |
| Answer» D. 10710 | |
| 263. |
The simplified form of the Boolean expression (X + Y + XY)(X + Z) is |
| A. | X + Y + Z |
| B. | XY + YZ |
| C. | X + YZ |
| D. | XZ + Y |
| Answer» D. XZ + Y | |
| 264. |
The number of binary bits required to represent a hexadecimal digit is |
| A. | 3 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» C. 6 | |
| 265. |
A microprocessor has memory locations from 0000 to 3FFF. Each memory location stores 1 byte. How bytes can the memory store? Express this in kilobytes? |
| A. | 4,095, 4K |
| B. | 16,384, 16K |
| C. | 32,740, 32K |
| D. | 46,040, 46K |
| Answer» C. 32,740, 32K | |
| 266. |
Which gates is known as universal gate? |
| A. | NOT gate |
| B. | AND gate |
| C. | NAND gate |
| D. | XOR gate |
| Answer» D. XOR gate | |
| 267. |
In boolean algebra, the overbar stands for the NOT operation, the plus sign stands for the _____ operation. |
| A. | AND |
| B. | OR |
| C. | NAND |
| D. | NOR |
| Answer» C. NAND | |
| 268. |
The master slave JK flip-flop is effectively a combination of |
| A. | an SR flip-flop and a T flip-flop |
| B. | an SR flip-flop and a D flip-flop |
| C. | a T flip-flop and a D flip-flop |
| D. | two T flip-flops |
| Answer» B. an SR flip-flop and a D flip-flop | |
| 269. |
A flip-flop can store: |
| A. | 1 bits of data |
| B. | 2 bits of data |
| C. | 3 bits of data |
| D. | 4 bits of data |
| Answer» B. 2 bits of data | |
| 270. |
De Morgan's first theorem says that a NOR gate is equivalent to a bubbled _____ gate. |
| A. | AND |
| B. | XAND |
| C. | XOR |
| D. | NOR |
| Answer» B. XAND | |
| 271. |
With an RS latch a high S and low R sets the output to _____ ; a low S and a high R _____ the output to low. |
| A. | No change, set |
| B. | Race, high |
| C. | high, reset |
| D. | set, reset |
| Answer» D. set, reset | |
| 272. |
What is the ASCII code for T? |
| A. | 1010100 |
| B. | 1011010 |
| C. | 1011100 |
| D. | 1011111 |
| Answer» B. 1011010 | |
| 273. |
A bus is a group of _____ carrying digital signals. |
| A. | wires |
| B. | gates |
| C. | transistors |
| D. | registers |
| Answer» B. gates | |
| 274. |
Address 200H contains the byte 3FH. What is the decimal equivalent of 3FH |
| A. | 63 |
| B. | 32 |
| C. | 16 |
| D. | 38 |
| Answer» B. 32 | |
| 275. |
The ALU carries out arithmetic and logic operations. It processes _____ numbers rather than decimal numbers. |
| A. | decimal |
| B. | hexadecimal |
| C. | binary |
| D. | All of the above |
| Answer» D. All of the above | |
| 276. |
The functional difference between SR flip-flop and JK flip-flop is that |
| A. | JK flip-flop is faster than SR flip-flop |
| B. | JK flip-flop has a feed back path |
| C. | JK flip-flop accepts both inputs 1 |
| D. | JK flip-flop does not require external clock |
| Answer» D. JK flip-flop does not require external clock | |
| 277. |
A p- channel enhancement type MOSFET performs much the same function as a PNP transistor, except that |
| A. | it operates much faster |
| B. | it is considerably larger |
| C. | it is controlled by voltage rather than by current, so that it requires very little current at the control terminal |
| D. | it is controlled by current rather than by voltage like a bipolar transistor. |
| Answer» D. it is controlled by current rather than by voltage like a bipolar transistor. | |
| 278. |
Conversion of an octal number 1128 to hexadecimal number is |
| A. | 4A16 |
| B. | 5A16 |
| C. | 1516 |
| D. | 2016 |
| Answer» B. 5A16 | |
| 279. |
If a microcomputer has a 64K memory, what are the hexadecimal notations for the first and last memory location? |
| A. | 0000, EEEE |
| B. | 0, 64 |
| C. | 0000, FFFF |
| D. | 0000, 9999 |
| Answer» D. 0000, 9999 | |
| 280. |
How many inputs signals can a gate have? |
| A. | one |
| B. | more than one |
| C. | two only |
| D. | both (a) and (b) |
| Answer» E. | |
| 281. |
The XOR gates are ideal for testing parity because even-parity words produce a _____ output and odd-parity words produce a _____ output |
| A. | low, high |
| B. | high, low |
| C. | odd, even |
| D. | even, odd |
| Answer» B. high, low | |
| 282. |
The inverter OR gate and AND gate are called decision-making elements because they can recognize some input _____ while disregarding others. A gate recognizes a word when its output is _____ |
| A. | words, high |
| B. | bytes, low |
| C. | bytes, high |
| D. | character, low |
| Answer» B. bytes, low | |
| 283. |
The Gray code for decimal 7 is |
| A. | 111 |
| B. | 1011 |
| C. | 100 |
| D. | 101 |
| Answer» D. 101 | |
| 284. |
Digital design often starts by constructing a _____ table. |
| A. | Standard |
| B. | Two-stage |
| C. | Truth |
| D. | Two-dinensional |
| Answer» D. Two-dinensional | |
| 285. |
An inverter is also called a _____ gate. |
| A. | NOT |
| B. | OR |
| C. | AND |
| D. | NAND |
| Answer» B. OR | |
| 286. |
A binary adder is a logic circuit that can add _____ binary numbers at a time. |
| A. | Hundreds |
| B. | Thousands |
| C. | One |
| D. | Two |
| Answer» E. | |
| 287. |
Conversion of decimal number 6110 to it's binary number equivalent is |
| A. | 1100112 |
| B. | 110011102 |
| C. | 1111012 |
| D. | 111112 |
| Answer» D. 111112 | |