Jharkhand Board Class 11 Computer Science MCQS

Here are 30 multiple-choice questions (MCQs) with answers from Chapter 1: Computer Systems for Jharkhand Board Class 11 Computer Science.

Multiple-Choice Questions (MCQs)

1. What is the full form of CPU?

a) Central Processing Unit

b) Central Program Unit

c) Control Processing Unit

d) Central Peripheral Unit

Answer: a) Central Processing Unit

2. Which of the following is an example of system software?

a) MS Word

b) Windows OS

c) Google Chrome

d) Photoshop

Answer: b) Windows OS

3. What is the function of an ALU in a computer?

a) Stores data

b) Performs arithmetic and logic operations

c) Controls input/output devices

d) Manages memory

Answer: b) Performs arithmetic and logic operations

4. Which of the following is NOT an input device?

a) Keyboard

b) Scanner

c) Monitor

d) Joystick

Answer: c) Monitor

5. What type of memory is volatile?

a) ROM

b) RAM

c) Hard Disk

d) DVD

Answer: b) RAM

6. The operating system is an example of:

a) Application software

b) Utility software

c) System software

d) Compiler

Answer: c) System software

7. What is the function of the control unit (CU) in a CPU?

a) Performs calculations

b) Controls the execution of instructions

c) Stores data permanently

d) Manages graphics processing

Answer: b) Controls the execution of instructions

8. Which of the following is a secondary storage device?

a) RAM

b) Cache Memory

c) Hard Disk

d) Registers

Answer: c) Hard Disk

9. The speed of a processor is measured in:

a) Bytes per second

b) Hertz

c) Pixels

d) Gigabytes

Answer: b) Hertz

10. Which of the following is an example of output hardware?

a) Mouse

b) Keyboard

c) Printer

d) Scanner

Answer: c) Printer

11. Which of the following is an example of application software?

a) Windows OS

b) Microsoft Excel

c) BIOS

d) Compiler

Answer: b) Microsoft Excel

12. What is the primary function of an operating system?

a) To play games

b) To manage hardware and software

c) To process data

d) To provide internet connectivity

Answer: b) To manage hardware and software

13. The basic unit of data storage in a computer is:

a) Byte

b) Bit

c) KB

d) MB

Answer: b) Bit

14. Which of the following is a volatile memory?

a) Hard Disk

b) ROM

c) RAM

d) DVD

Answer: c) RAM

15. The brain of a computer is:

a) Monitor

b) CPU

c) RAM

d) Hard Disk

Answer: b) CPU

16. The unit used to measure memory capacity is:

a) Kilobyte

b) Hertz

c) Pixel

d) Joule

Answer: a) Kilobyte

17. ROM stands for:

a) Random Only Memory

b) Read-Only Memory

c) Random Output Memory

d) Read-One Memory

Answer: b) Read-Only Memory

18. Which of the following is not a type of ROM?

a) PROM

b) EPROM

c) RAM

d) EEPROM

Answer: c) RAM

19. Cache memory is used to:

a) Store permanent data

b) Speed up CPU operations

c) Enhance graphics processing

d) Replace RAM

Answer: b) Speed up CPU operations

20. Which of the following is the fastest type of memory?

a) Cache Memory

b) RAM

c) Hard Disk

d) CD-ROM

Answer: a) Cache Memory

21. Which device is used to store data permanently?

a) RAM

b) Hard Disk

c) Cache Memory

d) Register

Answer: b) Hard Disk

22. BIOS stands for:

a) Basic Input Output System

b) Binary Integrated Operating System

c) Basic Internet Operating System

d) Binary Input Output System

Answer: a) Basic Input Output System

23. Which component is responsible for executing program instructions?

a) CPU

b) RAM

c) Hard Disk

d) Monitor

Answer: a) CPU

24. What does GUI stand for?

a) Graphical Unit Interface

b) Graphical User Interface

c) General Utility Interface

d) Graph User Interaction

Answer: b) Graphical User Interface

25. What is the function of a compiler?

a) Converts high-level language to machine language

b) Converts machine language to high-level language

c) Converts one high-level language to another

d) Controls the CPU

Answer: a) Converts high-level language to machine language

26. Which of the following is an example of a high-level programming language?

a) Machine Language

b) Assembly Language

c) Python

d) Binary Code

Answer: c) Python

27. What is the full form of HTTP?

a) HyperText Transfer Protocol

b) Hyperlink Transfer Protocol

c) High-Level Text Protocol

d) Hyper Transfer Text Program

Answer: a) HyperText Transfer Protocol

28. Which type of software is used to manage files and folders?

a) Operating System

b) Antivirus Software

c) Multimedia Software

d) Compiler

Answer: a) Operating System

29. What is the function of an assembler?

a) Converts assembly language to machine language

b) Converts high-level language to machine language

c) Converts machine language to high-level language

d) Runs programs

Answer: a) Converts assembly language to machine language

30. Which part of the computer is responsible for executing arithmetic and logical operations?

a) ALU

b) Control Unit

c) Cache Memory

d) Register

Answer: a) ALU

Here are 30 multiple-choice questions (MCQs) with answers from Chapter 2: Data Representation for Jharkhand Board Class 11 Computer Science.

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Multiple-Choice Questions (MCQs)

1. What is the smallest unit of data in a computer?

a) Byte

b) Bit

c) Nibble

d) Word

Answer: b) Bit

2. How many bits make up a byte?

a) 4

b) 8

c) 16

d) 32

Answer: b) 8

3. A nibble consists of how many bits?

a) 2

b) 4

c) 8

d) 16

Answer: b) 4

4. The decimal number system is based on which base?

a) 2

b) 8

c) 10

d) 16

Answer: c) 10

5. The binary number system consists of which two digits?

a) 0 and 2

b) 0 and 1

c) 1 and 2

d) 2 and 3

Answer: b) 0 and 1

6. What is the base of the hexadecimal number system?

a) 2

b) 8

c) 10

d) 16

Answer: d) 16

7. Which of the following is NOT a number system?

a) Decimal

b) Binary

c) ASCII

d) Hexadecimal

Answer: c) ASCII

8. What is the octal equivalent of the binary number 1010?

a) 10

b) 12

c) 14

d) 20

Answer: b) 12

9. How many digits are there in the octal number system?

a) 8

b) 10

c) 2

d) 16

Answer: a) 8

10. What is the hexadecimal equivalent of the decimal number 15?

a) A

b) B

c) F

d) 15

Answer: c) F

11. What is the decimal equivalent of the binary number 1011?

a) 9

b) 10

c) 11

d) 12

Answer: c) 11

12. ASCII stands for:

a) American Standard Code for Information Interchange

b) Advanced System Code for Internet Interface

c) American Symbolic Code for Information Integration

d) Automated Standard Communication for Internet

Answer: a) American Standard Code for Information Interchange

13. What is the value of 2^5?

a) 16

b) 32

c) 64

d) 128

Answer: b) 32

14. Which character encoding scheme is commonly used in computers?

a) ASCII

b) Binary

c) Hexadecimal

d) Decimal

Answer: a) ASCII

15. How many unique characters can be represented using 8-bit ASCII?

a) 64

b) 128

c) 256

d) 512

Answer: b) 128

16. What is the binary equivalent of decimal 25?

a) 11000

b) 11001

c) 10011

d) 10101

Answer: d) 11001

17. Which number system is commonly used in digital circuits?

a) Decimal

b) Binary

c) Octal

d) Hexadecimal

Answer: b) Binary

18. What is the octal equivalent of decimal number 17?

a) 17

b) 20

c) 21

d) 22

Answer: c) 21

19. What is the decimal equivalent of hexadecimal number B?

a) 10

b) 11

c) 12

d) 13

Answer: b) 11

20. In hexadecimal, what comes after digit 9?

a) 10

b) A

c) B

d) C

Answer: b) A

21. The hexadecimal number system uses which set of digits and letters?

a) 0-9, A-F

b) 0-7, A-G

c) 0-9, A-Z

d) 0-8, A-E

Answer: a) 0-9, A-F

22. What is the binary equivalent of hexadecimal number F?

a) 1110

b) 1111

c) 1010

d) 1101

Answer: b) 1111

23. What is the two’s complement of binary number 0010?

a) 1101

b) 1110

c) 1111

d) 1011

Answer: b) 1110

24. Which number system is used by modern computers to process data?

a) Decimal

b) Binary

c) Octal

d) Hexadecimal

Answer: b) Binary

25. What is the binary equivalent of decimal number 10?

a) 1010

b) 1001

c) 1110

d) 1101

Answer: a) 1010

26. In binary, what is 1 + 1?

a) 1

b) 10

c) 11

d) 100

Answer: b) 10

27. Which type of coding system is used to represent text in computers?

a) Hexadecimal

b) Binary

c) ASCII

d) Octal

Answer: c) ASCII

28. Which of the following is NOT an encoding system?

a) ASCII

b) EBCDIC

c) Unicode

d) Binary

Answer: d) Binary

29. What is the decimal equivalent of binary number 1001?

a) 7

b) 8

c) 9

d) 10

Answer: c) 9

30. What is the range of values for a single 8-bit binary number?

a) 0 to 127

b) 0 to 255

c) 0 to 1023

d) 0 to 511

Answer: b) 0 to 255

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Here are 30 multiple-choice questions (MCQs) with answers from Chapter 3: Boolean Algebra for Jharkhand Board Class 11 Computer Science.

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Multiple-Choice Questions (MCQs)

1. Boolean algebra was developed by:

a) George Boole

b) Charles Babbage

c) Alan Turing

d) John von Neumann

Answer: a) George Boole

2. Boolean algebra deals with:

a) Binary numbers

b) Decimal numbers

c) Fractions

d) Complex numbers

Answer: a) Binary numbers

3. The three basic logic gates are:

a) AND, OR, NOT

b) NAND, NOR, XOR

c) XOR, XNOR, NOR

d) NAND, OR, XOR

Answer: a) AND, OR, NOT

4. The output of an AND gate is 1 only when:

a) Any input is 1

b) Both inputs are 0

c) Both inputs are 1

d) One input is 0 and the other is 1

Answer: c) Both inputs are 1

5. The output of an OR gate is 1 when:

a) Both inputs are 1

b) Any one of the inputs is 1

c) Both inputs are 0

d) None of the above

Answer: b) Any one of the inputs is 1

6. The output of a NOT gate is:

a) Same as input

b) Opposite of input

c) Always 1

d) Always 0

Answer: b) Opposite of input

7. The Boolean expression for an AND gate is:

a) A + B

b) A . B

c) A ⊕ B

d) A ⊙ B

Answer: b) A . B

8. The Boolean expression for an OR gate is:

a) A + B

b) A . B

c) A ⊕ B

d) A ⊙ B

Answer: a) A + B

9. What is the output of NOT(1)?

a) 0

b) 1

c) Both 0 and 1

d) None of the above

Answer: a) 0

10. Which of the following is a universal gate?

a) AND

b) OR

c) NAND

d) NOT

Answer: c) NAND

11. The NAND gate is equivalent to:

a) NOT + AND

b) NOT + OR

c) AND + OR

d) XOR + NOT

Answer: a) NOT + AND

12. Which of the following gates produces an output of 1 only when both inputs are 0?

a) AND

b) OR

c) NOR

d) XOR

Answer: c) NOR

13. The Boolean equation A + 0 is equal to:

a) 0

b) 1

c) A

d) A’

Answer: c) A

14. The Boolean equation A . 1 is equal to:

a) 0

b) 1

c) A

d) A’

Answer: c) A

15. The complement of A + B is:

a) A . B

b) A' + B'

c) A' . B'

d) A + B'

Answer: c) A' . B'

16. The identity law states that:

a) A + 0 = A

b) A + 1 = A

c) A . 0 = A

d) A . 1 = 0

Answer: a) A + 0 = A

17. The distributive law in Boolean algebra states:

a) A + (B . C) = (A + B) . (A + C)

b) A . (B + C) = (A . B) + (A . C)

c) A + B = B + A

d) A . B = B . A

Answer: b) A . (B + C) = (A . B) + (A . C)

18. The Idempotent law states that:

a) A + A = A

b) A . A = A

c) Both a and b

d) None of the above

Answer: c) Both a and b

19. De Morgan's Theorem states that:

a) (A + B)’ = A’. B’

b) (A . B)’ = A’ + B’

c) Both a and b

d) None of the above

Answer: c) Both a and b

20. The Absorption law states that:

a) A + (A . B) = A

b) A . (A + B) = A

c) Both a and b

d) None of the above

Answer: c) Both a and b

21. The XOR gate gives an output of 1 when:

a) Both inputs are 1

b) Both inputs are 0

c) The inputs are different

d) The inputs are the same

Answer: c) The inputs are different

22. The Boolean function A’ + A is equal to:

a) 0

b) 1

c) A

d) A’

Answer: b) 1

23. The NOR gate is a combination of:

a) NOT + AND

b) NOT + OR

c) AND + OR

d) XOR + NOT

Answer: b) NOT + OR

24. The XOR gate is also known as:

a) Difference gate

b) Universal gate

c) Equality gate

d) Inverter

Answer: a) Difference gate

25. The dual of the Boolean expression A + B is:

a) A . B

b) A + B

c) A . B’

d) A + B’

Answer: a) A . B

26. The identity element for OR operation is:

a) 0

b) 1

c) A

d) B

Answer: a) 0

27. The identity element for AND operation is:

a) 0

b) 1

c) A

d) B

Answer: b) 1

28. If A = 0 and B = 1, what is A + B?

a) 0

b) 1

c) 2

d) -1

Answer: b) 1

29. If A = 1 and B = 1, what is A . B?

a) 0

b) 1

c) -1

d) 2

Answer: b) 1

30. Boolean algebra is used in:

a) Digital circuits

b) Analog circuits

c) Electrical circuits

d) None of the above

Answer: a) Digital circuits

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These MCQs cover fundamental concepts of Boolean Algebra, logic gates, laws, and properties. 

Here are 30 multiple-choice questions (MCQs) with answers from Chapter 4: Logic Gates for Jharkhand Board Class 11 Computer Science.

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Multiple-Choice Questions (MCQs)

1. A logic gate is a device that:

a) Performs arithmetic operations

b) Controls input and output devices

c) Processes binary data

d) Converts analog signals to digital

Answer: c) Processes binary data

2. Which of the following is NOT a basic logic gate?

a) AND

b) OR

c) NOT

d) XOR

Answer: d) XOR

3. The AND gate gives an output of 1 only when:

a) Any input is 1

b) Both inputs are 0

c) Both inputs are 1

d) One input is 0 and the other is 1

Answer: c) Both inputs are 1

4. The OR gate gives an output of 1 when:

a) Both inputs are 1

b) Any one of the inputs is 1

c) Both inputs are 0

d) None of the above

Answer: b) Any one of the inputs is 1

5. The NOT gate:

a) Inverts the input

b) Adds two binary numbers

c) Multiplies two binary numbers

d) Compares two inputs

Answer: a) Inverts the input

6. A NAND gate is equivalent to an AND gate followed by a:

a) NOT gate

b) OR gate

c) XOR gate

d) NOR gate

Answer: a) NOT gate

7. Which logic gate produces an output of 1 when both inputs are 0?

a) AND

b) OR

c) NOR

d) XOR

Answer: c) NOR

8. The symbol (+) represents which logic operation?

a) AND

b) OR

c) NOT

d) NOR

Answer: b) OR

9. The symbol (.) represents which logic operation?

a) AND

b) OR

c) NOT

d) XOR

Answer: a) AND

10. Which logic gate is known as the universal gate?

a) AND

b) OR

c) NAND

d) XOR

Answer: c) NAND

11. The NOR gate is equivalent to an OR gate followed by a:

a) NOT gate

b) AND gate

c) XOR gate

d) NAND gate

Answer: a) NOT gate

12. The XOR gate gives an output of 1 when:

a) Both inputs are 1

b) Both inputs are 0

c) The inputs are different

d) The inputs are the same

Answer: c) The inputs are different

13. The Boolean equation for an AND gate is:

a) A + B

b) A . B

c) A ⊕ B

d) A ⊙ B

Answer: b) A . B

14. The Boolean equation for an OR gate is:

a) A + B

b) A . B

c) A ⊕ B

d) A ⊙ B

Answer: a) A + B

15. What is the output of NOT(1)?

a) 0

b) 1

c) Both 0 and 1

d) None of the above

Answer: a) 0

16. What is the output of a NAND gate when both inputs are 1?

a) 0

b) 1

c) 2

d) -1

Answer: a) 0

17. What is the output of a NOR gate when both inputs are 0?

a) 0

b) 1

c) 2

d) -1

Answer: b) 1

18. The Boolean function A + A is equal to:

a) 0

b) 1

c) A

d) A’

Answer: c) A

19. The Boolean function A . A is equal to:

a) 0

b) 1

c) A

d) A’

Answer: c) A

20. The complement of A + B is:

a) A . B

b) A' + B'

c) A' . B'

d) A + B'

Answer: c) A' . B'

21. The identity law states that:

a) A + 0 = A

b) A + 1 = A

c) A . 0 = A

d) A . 1 = 0

Answer: a) A + 0 = A

22. The distributive law in Boolean algebra states:

a) A + (B . C) = (A + B) . (A + C)

b) A . (B + C) = (A . B) + (A . C)

c) A + B = B + A

d) A . B = B . A

Answer: b) A . (B + C) = (A . B) + (A . C)

23. The Idempotent law states that:

a) A + A = A

b) A . A = A

c) Both a and b

d) None of the above

Answer: c) Both a and b

24. De Morgan's Theorem states that:

a) (A + B)’ = A’. B’

b) (A . B)’ = A’ + B’

c) Both a and b

d) None of the above

Answer: c) Both a and b

25. The Absorption law states that:

a) A + (A . B) = A

b) A . (A + B) = A

c) Both a and b

d) None of the above

Answer: c) Both a and b

26. Which gate is used in parity generation and checking?

a) AND

b) OR

c) XOR

d) NOT

Answer: c) XOR

27. The logic circuit that can store a single binary bit is called a:

a) Flip-flop

b) Register

c) Counter

d) Encoder

Answer: a) Flip-flop

28. The Boolean function A’ + A is equal to:

a) 0

b) 1

c) A

d) A’

Answer: b) 1

29. The NOR gate is a combination of:

a) NOT + AND

b) NOT + OR

c) AND + OR

d) XOR + NOT

Answer: b) NOT + OR

30. Boolean algebra is used in:

a) Digital circuits

b) Analog circuits

c) Electrical circuits

d) None of the above

Answer: a) Digital circuits

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These 30 MCQs cover logic gates, Boolean functions, De Morgan’s Theorems, and Boolean laws. 

Here are 30 multiple-choice questions (MCQs) with answers from Chapter 5: Number System for Jharkhand Board Class 11 Computer Science.

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Multiple-Choice Questions (MCQs)

1. The number system used by computers is:

a) Decimal

b) Binary

c) Octal

d) Hexadecimal

Answer: b) Binary

2. The decimal number system is based on:

a) Base 2

b) Base 8

c) Base 10

d) Base 16

Answer: c) Base 10

3. The binary number system consists of:

a) 2 digits (0,1)

b) 8 digits (0-7)

c) 10 digits (0-9)

d) 16 digits (0-9, A-F)

Answer: a) 2 digits (0,1)

4. The octal number system is based on:

a) Base 2

b) Base 8

c) Base 10

d) Base 16

Answer: b) Base 8

5. The hexadecimal number system consists of how many symbols?

a) 8

b) 10

c) 12

d) 16

Answer: d) 16

6. The hexadecimal number system includes letters:

a) A to G

b) A to F

c) A to Z

d) None of the above

Answer: b) A to F

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

a) 1000

b) 1010

c) 1100

d) 1110

Answer: b) 1010

8. The decimal equivalent of the binary number 1011 is:

a) 9

b) 10

c) 11

d) 12

Answer: c) 11

9. The octal equivalent of the binary number 1101 is:

a) 12

b) 15

c) 16

d) 27

Answer: b) 15

10. The binary equivalent of the octal number 7 is:

a) 110

b) 111

c) 101

d) 100

Answer: b) 111

11. Which of the following is the correct binary addition of 101 + 11?

a) 1000

b) 1010

c) 1100

d) 1110

Answer: a) 1000

12. The result of binary subtraction 110 – 101 is:

a) 0

b) 1

c) 10

d) 11

Answer: b) 1

13. The decimal equivalent of hexadecimal number A is:

a) 9

b) 10

c) 11

d) 12

Answer: b) 10

14. The hexadecimal number system is also known as:

a) Base 2

b) Base 8

c) Base 10

d) Base 16

Answer: d) Base 16

15. The largest digit in the octal number system is:

a) 6

b) 7

c) 8

d) 9

Answer: b) 7

16. The decimal equivalent of binary 1111 is:

a) 10

b) 12

c) 14

d) 15

Answer: d) 15

17. How many bits are needed to represent a single hexadecimal digit in binary?

a) 2

b) 4

c) 6

d) 8

Answer: b) 4

18. The binary representation of the octal number 5 is:

a) 100

b) 101

c) 110

d) 111

Answer: b) 101

19. The largest two-digit hexadecimal number is:

a) FF

b) 99

c) F9

d) AA

Answer: a) FF

20. The decimal equivalent of hexadecimal 1A is:

a) 25

b) 26

c) 27

d) 28

Answer: b) 26

21. Which number system is commonly used in digital electronics?

a) Decimal

b) Binary

c) Octal

d) Hexadecimal

Answer: b) Binary

22. The binary equivalent of decimal 20 is:

a) 10000

b) 10100

c) 11000

d) 11100

Answer: b) 10100

23. The octal equivalent of the decimal number 25 is:

a) 30

b) 31

c) 32

d) 33

Answer: b) 31

24. What is the sum of binary numbers 1011 and 1101?

a) 10100

b) 11010

c) 11100

d) 10000

Answer: c) 11100

25. The complement of binary number 1011 is:

a) 0100

b) 1100

c) 1000

d) 1111

Answer: a) 0100

26. What is 2’s complement of binary number 1010?

a) 0101

b) 0110

c) 0111

d) 1101

Answer: d) 1101

27. How many digits are used in the binary number system?

a) 1

b) 2

c) 8

d) 10

Answer: b) 2

28. How is the hexadecimal number ‘C’ represented in binary?

a) 1010

b) 1011

c) 1100

d) 1111

Answer: c) 1100

29. What is the octal equivalent of binary number 101010?

a) 25

b) 42

c) 52

d) 62

Answer: c) 52

30. The hexadecimal equivalent of binary number 11110000 is:

a) F1

b) F2

c) F0

d) E0

Answer: c) F0

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These 30 MCQs cover number system conversions, binary arithmetic, octal, hexadecimal, and 2’s complement.