💻 Computing Solved MCQs with Answers

Practice 1954 approved 💻 Computing questions with verified answers from the 💾 Computer Science subject for Pakistan exams.

1954 solved MCQs

De Morgan's second therm says that NAND gate is equivalent to a bubbled _____ gate.Answer: OR What logic function is produced by adding an inverter to each input and the output of an AND gate?Answer: OR When a transistor is cut off or saturated, transistor _____ have almost no effectAnswer: variations Express -7 as 16-bit signed binary numbers.Answer: 1000 0000 0000 0111 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.Answer: high, reset Flip-flop outputs are alwaysAnswer: complimentary The output 0 and 1 levels for TTL logic family is approximatelyAnswer: 0.6 and 3.5 V A _____ TTL device can sink up to 16mA and can source up to 400 MA.Answer: Standard What is the 2's complement of 0011 0101 1001 1100 number?Answer: 1100 1010 0110 0100 Digital design often starts by constructing a _____ table.Answer: Truth The hexadecimal digits are 0 to 9 and A to _____Answer: F The ASCIIAnswer: has 128 characters, including 32 control characters An OR gate has 6 inputs. What is the only input word that produces a 0 output?Answer: 000000 A diagram that illustrates the ore (Logic) of functions in a progran called aAnswer: Flowchart The Gray code for decimal 7 isAnswer: 0100 The time required for a pulse to decrease from 90 to 10 percent of its maximum value is known asAnswer: decay time _____dominates the LSI field, and _____ is used extensively where lowest power consumption is necessary.Answer: NMOS, CMOS How many inputs signals can a gate have?Answer: both (a) and (b) A combinational logic circuit which is used when it is desired to send data from two or more source through a single transmission line is known asAnswer: multiplexer Which logic family dissipates the minimum power?Answer: CMOS What logic function is obtained by adding an inverter to the inputs of an AND gate?Answer: NOR A bus is a group of _____ carrying digital signals.Answer: wires The simplified form of the Boolean expression (X + Y + XY)(X + Z) isAnswer: X + YZ De Morgan's first theorem says that a NOR gate is equivalent to a bubbled _____ gate.Answer: AND How many bits are required to encode all twenty six letters ten symbols, and ten numerals?Answer: 6 An inverter is also called a _____ gate.Answer: NOT The binary number 1100 0101 has _____ bytesAnswer: 1 With a NAND latch a low R and a low S produce a _____ condition.Answer: race Which of the following logic families has the highest noise immunity?Answer: HTL The ALU carries out arithmetic and logic operations. It processes _____ numbers rather than decimal numbers.Answer: All of the above