# 3. The high voltage level of a digital signal in positive logic is : a) 1 b) 0 c) either 1 or 0

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1 1. The number of level in a digital signal is: a) one b) two c) four d) ten 2. A pure sine wave is : a) a digital signal b) analog signal c) can be digital or analog signal d) neither digital nor analog signal 3. The high voltage level of a digital signal in positive logic is : a) 1 b) 0 c) either 1 or 0 4. A device that converts from decimal to binary numbered is called : a) decoder b) encoder c) CPU d) convertor 5. K is an abbreviation used with a number of units. Thus 2K means a) 2000 units b) 2048 units c) 2024 units d) none of these 6. Bit is: a) smallest piece of electronic hardware b) a drilling tool

2 c) an abbreviation for binary digit d) the smallest number 7. A register is: a) a group of memories b) a group of devices that store digital data c) a chip used in computer d) a pure silica piece used in digital system 8. A typical microcomputer has 65,536 registers in its memory. It will be specified as : a) 65,536 memory b) 65,536 K memory c) 64 K memory d) 8 K memory 9. Nibble is : a) a string of 4 bits b) a string of 8 bits c) a string of 16 bits d) a string of 64 bits 10. The high voltage level of a digital signal in negative logic is : a) 1 b) 0 c) either 1 or 0 11.Number of gates/chip in SSI : a) < 12 b) < 100 c) < 1000 d) > Number of gates/chip in LSI : a) < 12 b) Between 12 and 99

3 c) < 1000 d) > Number of gates/chip in VLSI : a) < 12 b) < 100 c) < 1000 d) > The electronic, magnetic and mechanical devices of a computer are known as: a) CPU b) memory c) hardware d) radix 14. Ordinary electrical switch is: a) Analog b) Digital c) None of the above 15. Train of pulses is: a) Analog b) Digital c) None of the above 16. Octal 16 is equal to decimal: a) 13 b) 14 c) 15 d) The binary number is equal to octal number:

4 a) 65 b) 55 c) 51 d) Binary number when converted to its 2 s complement will become : a) b) c) d) The sum of binary numbers and is given by : a) b) c) d) The hexadecimal digits are : a) 1 to 16 b) 1 to 9 c) 0 to 9 d) 1 to A gate in which all input must be low to get a high output is called: a) an inverter b) A NOR gate c) an AND gate d) a NAND gate 22. A NAND circuit with positive logic will operate as : a) NOR with negative logic b) AND with negative logic c) OR with negative logic input d) AND with positive logic output

5 23. To implement all function of the basic logic function, is sufficient to have: a) OR b) NOT c) AND NOT d) none of these 24. Which of the following ICs has only one NAND gate: a) 7410 b) 7420 c) 7430 d) OR operation is: a) X + XY B) XY C) X+Y D) (X+Y) (X+Y) 26. AND operation is: a) X(X + Y ) B) XY C) X+Y D) (X+Y) (X+Y) 27. NOR operation is: a)x + Y B) XY C) X+Y D) (X+Y) (X+Y) 28. NAND operation is: a)x + Y

6 B) XY C) X+Y D) (X+Y) (X+Y) 29. What is the no. of OR IC. : a) 7402 b) 7486 c) 7432 d) What is the no. of AND IC. : a) 7402 b) 7408 c) 7447 d) What is the no. of NOR IC. : a) 7402 b) 7486 c) 7447 d) What is the no. of NAND IC. : a) 7402 b) 7404 c) 7400 d) What is the no. of NOT IC. : a) 7402 b) 7486 c) 7404 d) What is the no. of EX-OR IC. :

7 a) 7402 b) 7486 c) 7447 d) Which of the following ICs has three input NAND gate: a) 7420 b) 7430 c) 7410 d) Which of the following is Boolean eq. of EX-OR gate: a) A+B B) A+B C) AB D) A B + A B 38. Which one is the universal gate: a) AND gate b) OR gate c) NAND gate d) EX-OR gate 39. Bubbles on the gate shows a) active high b) active low c) both a and b d) none 40. Which statement is verify NAND gate : a) if all input are high output is low b) if all input are low output is low c) any one n are low output is low d) none of them 41. In regard to NAND gate the following four statement are made:

8 1. it is equivalent to an AND gate followed by an inverter 2. if all input to it are low, the output is low 3. if all input are high, the output is low 4. NAND operation on two elements is equivalent to OR operation on them. OF thses, the only true statements are a) 1,2 b) 1,3 c) 1,4 d) 2,4 42.The Gray code for number 7 is : a) 1100 b) 1001 c) 0100 d) The gray code for number 2 is : a) 0010 b) 0011 c) 1000 d) The gray code for number 6 is : a) 1100 b) 1001 c) 0101 d) None of the above 45. The Excess 3 for number 6 is : a) 1100 b) 1001 c) 0101 d) The excess 3 number 8 is: a) 1100 b) 1011

9 c) 0101 d) BCD numbers are obtained by : a) converting decimal number to binary b) converting decimal to octal number c) each decimal digit is represented by a four bit binary d) converting binary to decimal 48. ( is a) ( b) ( c) ( d) ( ( ) is equal to : a) 7 b) 8 8 c) 7 4 d) Square root of 4 is : a) b) 2 10 c) 8 16 d) In the expression A(A+B) by writing the first term A as A+0, the expression is best simplified as : a) A+AB b) AB c) A d) A+B 52. A four bit number is given its one s complement is : a) 1001 b) 1110

10 c) 0110 d) The term VLSI generally refers to a digital IC having : (a) more than 1000 gates (b) more than 100 gates (c) more than 1000 but less than 9999 gates (d) more than 100 but less than 999 gates 54. The expression for sum of A, B in the half adder is given by: a) AB b) A + B c) AÐ B d) none of these 55. Which expression for the sum of full adder circuit.: a) AB B) A+B C) A B D) none of these 56. Combinational circuit has : a) memory b) no memory c) flip-flops d) counters 57. The sum of and in decimal form will be a) 65 b) 75 c) 85 d) The digit 0 with carry of I is the sum of binary addition: a) b) c) 0 + 1

11 d) Which of the following flips-flop is used as latch: a) TTL b) ECL c) CMO d) LSI 60. Which of the following flip-flops is used as latch: a) JK flip-flop b) D flip-flop c) RS flip-flop d) T flip-flop 61. Which of the following circuit can be used as parallel to series converter a) digital counter b) decoder c) de-multiplexer d) multiplexer 62. Which of the following ICs contain four negative edge triggered flipflops. a) 7493 b) 7486 c) 7490 d) Multiplexer is : a) 1 input many output b) many inputs 1 output c) many input many output d) one input one output

12 64. Demultiplexer is : a) 1 input many output b) many inputs 1 output c) many input many output d) one input one output 64. In 8:1 mux the no. of select lines are : a) 1 b) 3 c) 5 d) In 16:1 mux the no. of select lines are : a) 6 b) 3 c) 4 d) In 3: 8 decoder the no. of inputs are a) 8 b) 3 c) 1 d) Decoder is: a) ) 1 input many output b) many inputs 1 output c) many input many output d) one input one output 68. Sequential circuit has : a) feedback b) no feedback c) may or may not d) none of these

13 69. For a level input sequential circuit : a) output in a level only b) output is in the pulse form c) output may be a pulse or a level form d) none of these 70. In a ring counter 1 for N clock pulse the scale for the counter is : a) N:1 b) N:2 c) N:10 d) N: Binary coded decimal number express each decimal digit as a : a) unit b) bit c) byte d) nibble 72. How many bytes are there in : a) 2 b) 2 ½ c) 3 d) 3 ½ 73. For a decade counter, number of binaries required is : a) five b) ten c) eight d) two 74. Counter ; a) it counts the no. randomly b) it counts the no. sequentially c) both a and b d) none of these

14 75. What is asynchronous counter : a) each flip-flop has it own clock b) all the flip-flop are combined to common clock c) both a and b d) none of the above 76. UP Counter is : a) it counts in upward manner b) it count in down ward manner c) it counts in both the direction d) none of the above 77. DOWN counter is: a) it counts in upward manner b) it count in down ward manner c) it counts in both the direction d) none of the above 78. Another name of Johnson counter : a) asynchronous counter b) synchronous counter c) ring counter d) none of above 79. Give full form of SIPO shift registers : a) serial in parallel output b) single in parallel output c) series input peripherals output d) none of above 80. Give full form of PISO shift registers : a) primary input secondary output b) parallel in secondary output c) parallel in serial out d) none of above

15 81. Give full form of PIPO shift registers : a) parallel in parallel out b) primary in parallel out c) parallel in primary out d) none 82. What is tristate shift registers : a) it has 3 inputs b) it has high, low or high impedance output c) both a and b d) none 83. Which ICs belongs to tristate shift registers a) 7483 b) 7492 c) d) none 84. In bidirectional shift registers date can be shifted to: a) right or left b) up or down c) both d) none 85. How many 7490 ICs are to be cascaded to count upto 999: a) 1 b) 2 c) 3 d) Program counter in a digital computer : a) counts the number of program run in the machine b) counts the number of times a subroutine is called c) counts the number of times the loops are executed d) points the memory address of the current or the next instruction to be executed

16 87. A ring counter is same as : a) up-down counter b) parallel c) shift register d) none of these above 88. In a sign magnitude representation, the leading bit a) is a part of the number itself b) is unity for positive c) is always unity d) stands for the sign 89. In a four variable Karnaugh map eight adjacent cells give a : (a) two variable term (b) single variable term (c) three variable term (d) four variable term 90. A Karnaugh map with 4 variables has : (a) 2 cells (b) 4 cells (c) 8 cells (d) 16 cells 91. In a Karnaugh map for an expression having don t care terms the don t cares can be treated as : (a) 0 (b) 1 (c) 1 or 0 (d) none of the above 93. The Boolean expression A B + A B C +(A+B+C) simplifies to : a. A B + B C b. AB + BC c. A B + B C

17 d. A B + B C 94. The radix for binary system is : a. 0 b. 1 c. 2 d The radix for decimal system is : a. 0 b. 1 c. 10 d. Log, The radix for octal system is : a. 1 b. Log, 6 c. 6 d Typical size of digital IC is about : (a) 1 "x 1" (b) 2 " x 2" (c) 0.1 "X 0.1" (d) "x 6.001" 98. A digital clock uses 4 chip : (a) SSI (b) LSI (C) VLSI (d) MSI 99. Digital tectionologies being used now-a-days are : (a) DTL and EMOS (b) TTL, ECL, CMOS and RTL (c) TTL, ECL and CMOS

18 (d) TTL, ECL. CMOS and DTL 100. A TTL circuit with totem pole output has : (a) high output impedance (b) low output impedance (c) very high output impedance (d) any of above 101. TTL uses: (a) multi emitter transistors (b) multi collector transistors (c) multi base transistors (d) multi emitter or multi collector transistors *************************************************************

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