Q1. The binary number system uses which base?

A) Base 10

B) Base 8

C) Base 2

D) Base 16

E) Base 1

Answer: C

 

Q2. In the Hexadecimal number system, the letter 'A' represents which decimal value?

A) 10

B) 11

C) 12

D) 1

E) 15

Answer: A

 

Q3. Which of the following is NOT a valid Octal number?

A) 123

B) 777

C) 801

D) 456

E) 007

Answer: C (Octal only uses digits 0-7. The digit 8 is illegal).

 

Q4. The computer internally uses which system to store data and perform calculations?

A) Decimal

B) Hexadecimal

C) Octal

D) Binary

E) Roman

Answer: D

 

Q5. A group of 4 bits is technically known as a:

A) Byte

B) Nibble

C) Word

D) Bit

E) Kilobit

Answer: B

 

Q6. Which Logic Gate returns "True" (1) only if BOTH inputs are "True" (1)?

A) OR Gate

B) NOT Gate

C) AND Gate

D) XOR Gate

E) NAND Gate

Answer: C

 

Q7. What is the decimal equivalent of the binary number (101)2?

A) 3

B) 5

C) 6

D) 7

E) 4

Answer: B (1×4+0×2+1×1=51×4+0×2+1×1=5)

 

Q8. The acronym ASCII stands for:

A) American Standard Code for Information Interchange

B) American Scientific Code for Information Interchange

C) Asian Standard Code for Information Interchange

D) American Standard Code for Internet Interchange

E) Advanced System Code for Information Integration

Answer: A

 

Q9. Which logic gate is known as the "Inverter" because it reverses the input?

A) AND

B) OR

C) NOT

D) NAND

E) XOR

Answer: C

 

Q10. In computer terminology, 1 Byte is equal to:

A) 4 Bits

B) 8 Bits

C) 16 Bits

D) 10 Bits

E) 2 Bits

Answer: B

 

Q11. Which coding standard allows computers to represent characters from all languages of the world (like Hindi, Chinese, etc.)?

A) ASCII

B) BCD

C) EBCDIC

D) Unicode

E) ANSI

Answer: D

 

Q12. The Hexadecimal number system uses a base of:

A) 2

B) 8

C) 10

D) 12

E) 16

Answer: E

 

Q13. Which two logic gates are known as the "Universal Gates"?

A) AND and OR

B) NAND and NOR

C) XOR and XNOR

D) NOT and BUFFER

E) AND and XOR

Answer: B (They can be used to construct all other gates).

 

Q14. What is the decimal value of the Hexadecimal digit 'F'?

A) 14

B) 15

C) 16

D) 10

E) 12

Answer: B

 

Q15. The "EBCDIC" coding scheme was primarily developed and used by which company for their Mainframe computers?

A) Apple

B) Microsoft

C) IBM

D) Intel

E) Google

Answer: C

 

Q16. To convert a Decimal number to Binary, we use the method of:

A) Repeated Multiplication by 2

B) Repeated Division by 2

C) Repeated Subtraction of 2

D) Repeated Addition of 2

E) Square Root

Answer: B

 

Q17. Which logic gate produces a LOW (0) output only when both inputs are HIGH (1), acting as the opposite of AND?

A) OR

B) NOR

C) NAND

D) XOR

E) XNOR

Answer: C (Not AND).

 

Q18. In Boolean Algebra, the expression "A + B" represents which logic operation?

A) AND

B) OR

C) NOT

D) XOR

E) NAND

Answer: B (Plus symbol represents OR).

 

Q19. In Boolean Algebra, the expression "A . B" (A dot B) represents which logic operation?

A) AND

B) OR

C) NOT

D) NOR

E) XOR

Answer: A (Dot represents AND).

 

Q20. Which number system is often used in HTML color codes (e.g., #FF5733)?

A) Binary

B) Octal

C) Decimal

D) Hexadecimal

E) Roman

Answer: D

 

Q21. The value of 2020 (2 to the power of 0) is:

A) 0

B) 1

C) 2

D) 10

E) Null

Answer: B

 

Q22. The BCD code (Binary Coded Decimal) uses how many bits to represent each decimal digit?

A) 2

B) 4

C) 8

D) 16

E) 32

Answer: B

 

Q23. Which gate returns a value of 1 if the inputs are different (one is 0, the other is 1)?

A) AND

B) OR

C) XOR (Exclusive OR)

D) NOR

E) NAND

Answer: C

 

Q24. The binary equivalent of the decimal number 10 is:

A) 1000

B) 1001

C) 1010

D) 1100

E) 0110

Answer: C (8+2=10)

 

Q25. What is the largest digit available in the Octal number system?

A) 7

B) 8

C) 9

D) F

E) 10

Answer: A

 

Q26. Which of the following is the correct representation of "True" and "False" in binary logic?

A) True=0, False=1

B) True=1, False=0

C) True=1, False=1

D) True=0, False=0

E) True=A, False=B

Answer: B

 

Q27. The ASCII value for the uppercase letter 'A' is:

A) 65

B) 97

C) 48

D) 32

E) 127

Answer: A

 

Q28. The ASCII value for the lowercase letter 'a' is:

A) 65

B) 97

C) 90

D) 122

E) 10

Answer: B

 

Q29. A "Word" in computer architecture refers to:

A) A single alphanumeric character.

B) The number of bits a CPU can process in a single cycle (e.g., 32-bit or 64-bit).

C) 2 Bytes.

D) A specialized command.

E) 8 bits strictly.

Answer: B

 

Q30. The "2's Complement" method is primarily used in computers to:

A) Represent colors.

B) Represent negative numbers and perform subtraction.

C) Convert text to audio.

D) Compress data.

E) Encrypt passwords.

Answer: B

 

Q31. Which of the following is a "weighted" code?

A) ASCII

B) BCD (8421)

C) Excess-3

D) Gray Code

E) Unicode

Answer: B (Positions 8, 4, 2, 1 have specific weights).

 

Q32. In the binary number 10110, the leftmost bit (1) is called the:

A) LSB (Least Significant Bit)

B) MSB (Most Significant Bit)

C) Parity Bit

D) Stop Bit

E) Carry Bit

Answer: B (It holds the highest value).

 

Q33. What is the result of the binary addition 1+11+1 ?

A) 2

B) 10 (which is 2 in decimal)

C) 11

D) 1

E) 0

Answer: B (Writes as 0, carries 1).

 

Q34. Standard ASCII uses 7 bits. Extended ASCII uses how many bits?

A) 8

B) 9

C) 16

D) 32

E) 64

Answer: A

 

Q35. Gray Code is also known as:

A) Weighted Code

B) Reflected Binary Code (Unit Distance Code)

C) Alphanumeric Code

D) Error Correcting Code

E) BCD Code

Answer: B (Only one bit changes at a time).

 

Q36. How many unique values can be represented by a standard Byte (8 bits)?

A) 100

B) 255

C) 256

D) 128

E) 512

Answer: C (28=25628=256, values 0 to 255).

 

Q37. Which system is used to represent the MAC Address of a network card (e.g.   00:1A:2B:3C:4D:5E)?

A) Binary

B) Octal

C) Hexadecimal

D) Decimal

E) IP Addressing

Answer: C

 

Q38. The binary number 1111 represents which decimal value?

A) 10

B) 12

C) 14

D) 15

E) 16

Answer: D (8+4+2+1=15)

 

Q39. What does the "Radix Point" separate?

A) Integers from Fractions (like a decimal point).

B) Positive from Negative numbers.

C) Bytes from Bits.

D) Data from Instructions.

E) Hardware from Software.

Answer: A

 

Q40. Which Boolean Law states that 𝐴+𝐵=𝐵+𝐴?

A) Associative Law

B) Commutative Law

C) Distributive Law

D) Identity Law

E) Inverse Law

Answer: B

 

Q41. A NOR gate is equivalent to:

A) An OR gate followed by a NOT gate.

B) An AND gate followed by a NOT gate.

C) A NAND gate.

D) An XOR gate.

E) A simple wire.

Answer: A

 

Q42. How many bits are in 1 Kilobyte (KB)?

A) 1000

 

B) 1024

 

C) 1024×8

 

D) 1000×8

 

E) 88

 

Answer: C (1024 Bytes × 8 Bits).

 

Q43. The "Parity Bit" is added to data primarily for:

A) Increasing speed.

B) Error detection.

C) Encrypting the message.

D) Formatting the text.

E) Making the data longer.

Answer: B

 

Q44. In Boolean algebra, 𝐴⋅1 equals:

A) 0

B) 1

C) A

D) 𝐴ˉ (Not A)

E) Undefined

Answer: C

 

Q45. Which of the following is an example of a "Non-weighted" code?

A) Binary

B) Decimal

C) Hexadecimal

D) Excess-3 Code

E) Octal

Answer: D

 

Q46. The smallest unit of an image on a computer screen is called a:

A) Bit

B) Pixel

C) Resolution

D) Dot

E) Vector

Answer: B (Though related to graphics, pixels are represented by bits of color depth).

 

Q47. If you have 3 inputs (A, B, C), how many possible combinations are in the Truth Table?

A) 3

B) 4

C) 6

D) 8

E) 9

Answer: D (23=8 ).

 

Q48. Which gate is often used as a "Controlled Inverter"?

A) AND

B) OR

C) XOR

D) NAND

E) Buffer

Answer: C

 

Q49. The octal equivalent of the decimal number 8 is:

A) 8

B) 10

C) 7

D) 100

E) 01

Answer: B (Since 8 doesn't exist in octal, it resets to 10).

 

Q50. Which logic family is the most common in modern CPUs?

A) TTL (Transistor-Transistor Logic)

B) CMOS (Complementary Metal-Oxide-Semiconductor)

C) ECL

D) RTL

E) DTL

Answer: B (Low power consumption).

 

Q51. What is the main advantage of using the Hexadecimal system over Binary for humans?

A) Computers process Hex faster.

B) It uses less memory.

C) It represents long binary strings in a shorter, more readable format.

D) It can store fractions better.

E) It is used for encryption.

Answer: C (It compresses 4 binary bits into 1 hex digit).

 

Q52. In 2's complement representation, the MSB (Most Significant Bit) is used to indicate:

A) The magnitude of the number.

B) The sign of the number (0 for Positive, 1 for Negative).

C) The parity error.

D) The decimal point location.

E) The overflow status.

Answer: B

 

Q53. To convert a Binary number to Octal, you group the bits into sets of:

A) 2

B) 3

C) 4

D) 5

E) 8

Answer: B (23=8, so 3 bits define one octal digit).

 

Q54. To convert a Binary number to Hexadecimal, you group the bits into sets of:

A) 2

B) 3

C) 4

D) 5

E) 16

Answer: C (24=16, so 4 bits define one hex digit).

 

Q55. Which of the following is equal to 1 Petabyte (PB)?

A) 1024 TB

B) 1024 GB

C) 1024 EB

D) 1024 ZB

E) 1000 TB

Answer: A

 

Q56. Which Boolean Law states: 𝐴+𝐵‾=𝐴ˉ⋅𝐵ˉ ?

A) Commutative Law

B) Associative Law

C) De Morgan's First Theorem

D) Distributive Law

E) Identity Law

Answer: C (The "Break the bar, change the sign" rule).

 

Q57. A "Floating Point" number is used to represent:

A) Whole numbers only.

B) Text characters.

C) Very large or very small real numbers (numbers with decimals/fractions).

D) Images.

E) Audio signals.

Answer: C

 

Q58. The standard IEEE 754 is used for:

A) Integer Arithmetic.

B) Floating Point Arithmetic representation.

C) Character Encoding.

D) Network Protocols.

E) Logic Gate design.

Answer: B

 

Q59. If 𝐴=1 and 𝐵=0 , what is the output of an XOR gate?

A) 0

B) 1

C) Undefined

D) Null

E) High Impedance

Answer: B (Inputs are different, so output is 1).

 

Q60. Which code is a "Self-Complementing" code?

A) BCD

B) Excess-3

C) ASCII

D) Unicode

E) 8421

Answer: B

 

Q61. The value of (111)2(111)2 in Decimal is:

A) 3

B) 6

C) 7

D) 8

E) 111

Answer: C (4+2+1=7).

 

Q62. What is the value of (𝐴0)16 in Decimal?

A) 100

B) 160

C) 10

D) 16

E) 256

Answer: B (10×161+0=160).

 

Q63. A logic circuit that can add two single bits is called a:

A) Full Adder

B) Half Adder

C) Decoder

D) Encoder

E) Multiplexer

Answer: B (A Full Adder adds three bits including carry).

 

Q64. Which device selects one input from many input lines and directs it to a single output line?

A) Decoder

B) Encoder

C) Multiplexer (MUX)

D) Demultiplexer

E) Flip-Flop

Answer: C

 

Q65. A "Flip-Flop" is a digital circuit capable of storing:

A) 1 Byte of data.

B) 1 Bit of data.

C) 4 Bits of data.

D) An entire file.

E) No data.

Answer: B (The basic storage element for SRAM).

 

Q66. Which coding scheme uses 16 bits, allowing for 65,536 unique characters?

A) ASCII

B) Extended ASCII

C) Unicode (UTF-16)

D) BCD

E) EBCDIC

Answer: C

 

Q67. The "Universal Product Code" (UPC) or Barcode is a form of:

A) Binary Input.

B) Analog Input.

C) Hexadecimal Input.

D) Voice Input.

E) Text Input.

Answer: A (The bars represent binary widths).

 

Q68. In Boolean Algebra, 𝐴+𝐴ˉ equals:

A) 0

B) 1

C) A

D) 𝐴ˉ

E) Undefined

Answer: B (Example: 1+0=1).

 

Q69. In Boolean Algebra, 𝐴⋅𝐴ˉ  equals:

A) 0

B) 1

C) A

D) 𝐴ˉ

E) Undefined

Answer: A (Example: 1⋅0=0).


Q70. Which logic gate is equivalent to the Boolean expression 𝐴⋅𝐵 ?

A) AND

B) OR

C) NOR

D) NAND

E) XOR

Answer: D (Not AND).

 

Q71. The "Base" of a number system is also known as the:

A) Radix

B) Matrix

C) Helix

D) Index

E) Apex

Answer: A

 

Q72. Convert the Decimal number 9 to Binary.

A) 1000

B) 1001

C) 1010

D) 1100

E) 1111

Answer: B

 

Q73. What is the value of (10)8 (10)8 in Decimal?

A) 10

B) 2

C) 8

D) 16

E) 80

Answer: C (1×81+0=8).

 

Q74. Which of the following is the largest memory unit?

A) Yottabyte (YB)

B) Zettabyte (ZB)

C) Exabyte (EB)

D) Petabyte (PB)

E) Terabyte (TB)

Answer: A

 

Q75. The "Control Unit" uses logic gates to:

A) Store data permanently.

B) Interpret instructions and route signals.

C) Draw graphics.

D) Connect to the internet.

E) Play music.

Answer: B

 

Q76. A group of 8 bits is a Byte. A group of 2 Bytes (16 bits) is often called a:

A) Double Word

B) Word (in 16-bit architecture)

C) Quad Bit

D) Paragraph

E) Sentence

Answer: B

 

Q77. Which system uses digits 0-9 and letters A-F?

A) Binary

B) Octal

C) Decimal

D) Hexadecimal

E) Duodecimal

Answer: D

 

Q78. In Hexadecimal, the number following 9 is:

A) 10

B) A

C) B

D) 0

E) 1

Answer: B

 

Q79. In Hexadecimal, the number following F is:

A) G

B) 10

C) 16

D) 0

E) FF

Answer: B (Resets to 10, which equals 16 in decimal).

 

Q80. Which logic circuit is used to decode binary information into decimal form (e.g., inside a calculator display)?

A) Encoder

B) Decoder

C) Multiplexer

D) Adder

E) Inverter

Answer: B

 

Q81. The "ASCII" code is a subset of:

A) EBCDIC

B) Unicode

C) BCD

D) Gray Code

E) Baudot Code

Answer: B (Unicode includes all ASCII characters).

 

Q82. Which number system is base 10?

A) Binary

B) Octal

C) Decimal

D) Hexadecimal

E) Unary

Answer: C

 

Q83. A "Truth Table" is used to:

A) List all possible input combinations and the resulting output of a logic gate.

B) Verify passwords.

C) Store true data only.

D) Convert Decimal to Binary.

E) Draw circuits.

Answer: A

 

Q84. Which gate outputs a 1 only when inputs are 0 and 0?

A) OR

B) AND

C) NOR

D) NAND

E) XOR

Answer: C (NOR is "Not OR". OR is 0 only for 0,0. So NOR is 1 only for 0,0).

 

Q85. In a 3-bit binary system, what is the maximum decimal number you can represent?

A) 3

B) 7

C) 8

D) 9

E) 6

Answer: B (111=7).

 

Q86. To represent the number 16 in binary, how many bits do you need minimum?

A) 3

B) 4

C) 5

D) 6

E) 8

Answer: C (10000 requires 5 bits).

 

Q87. Which of the following is NOT a standard coding system?

A) ASCII

B) EBCDIC

C) HTML (This is a markup language, not a character encoding system like ASCII)

D) Unicode

E) ISCII (Indian Script Code)

Answer: C

 

Q88. The boolean expression  𝐴⋅(𝐵+𝐶)  is equal to:

A) 𝐴⋅𝐵+𝐶

B) 𝐴⋅𝐵+𝐴⋅𝐶

C) 𝐴+𝐵⋅𝐶

D) (𝐴+𝐵)⋅(𝐴+𝐶)

E) 𝐴+𝐵+𝐶

Answer: B (Distributive Law).

 

Q89. Which of the following values cannot be stored in a single Bit?

A) 0

B) 1

C) 2

D) On

E) Off

Answer: C (Requires at least 2 bits: 10).

 

Q90. The term "Bit Depth" refers to:

A) The physical depth of a chip.

B) The number of bits used to represent the color of a single pixel.

C) The amount of RAM.

D) The speed of the hard drive.

E) The size of the monitor.

Answer: B

 

Q91. What is the Octal equivalent of Binary 111?

A) 1

B) 3

C) 7

D) 8

E) 10

Answer: C

 

Q92. What is the Hexadecimal equivalent of Binary 1010?

A) 10

B) A

C) B

D) C

E) F

Answer: B

 

Q93. A digital circuit that performs arithmetic and logical operations is the:

A) ALU

B) CU

C) MUX

D) RAM

E) ROM

Answer: A

 

Q94. Positive Logic means:

A) 1 is High Voltage, 0 is Low Voltage.

B) 0 is High Voltage, 1 is Low Voltage.

C) Both are High.

D) Both are Low.

E) Logic that always yields True.

Answer: A

 

Q95. Which gate is used to check for equality (Output 1 if inputs are same)?

A) XOR

B) XNOR (Exclusive NOR)

C) AND

D) OR

E) NAND

Answer: B (The opposite of XOR).

 

Q96. The decimal number 0.5 is represented in binary as:

A) 0.1

B) 0.5

C) 0.01

D) 0.101

E) 0.2

Answer: A

 

Q97. In EBCDIC, how many bits are used to represent a character?

A) 4

B) 7

C) 8

D) 16

E) 32

Answer: C

 

Q98. Which of the following is true about "Lossy Compression"?

A) No data is lost.

B) Some data is permanently discarded to reduce file size (e.g., JPEG, MP3).

C) It is used for text files.

D) It increases file size.

E) It is used for databases.

Answer: B

 

Q99. The "Buffer" gate:

A) Inverts the input.

B) Does not change the logic state (Input 1 -> Output 1), but amplifies the signal strength.

C) Always outputs 0.

D) Always outputs 1.

E) Adds two bits.

Answer: B

 

Q100. ISCII stands for:

A) Indian Standard Code for Information Interchange

B) International Standard Code for Information Interchange

C) Internet Standard Code for Information Interchange

D) Indian Scientific Code for Information Interchange

E) Integrated System Code for Information Interchange

Answer: A (Developed for Indian languages).