Computer Science Class 9th Unit 2 Binary System MCQs Short Long Notes

1. The OR operator of Boolean algebra is denoted by:


2. The digits used in a binary number system are.


3. Which binary value equals 20?


4. 1TB = _______:


5. Boolean values can be:


6. A+(B.C) = (A+B).(A+C) represents:


7. 1 GB (Gigabyte) is equivalent to:


8. Expression (A + B) . (A + C) is equal to:


9. For converting a decimal number to a hexadecimal number it is repeatedly divided by:


10. The following consists of more than one proposition.


11. Computer uses the _________ number system to store data and perform calculations.


12. In the Boolean expression X=A+B, the “+” represents ________ operation:


13. A byte consist of nibbles =_________


14. Which type of memory can read data but can’t write data?


15. Which strategy draws a pictorial representation of the solution?


16. _________ is the term used for digits of the binary system:


17. (C)₁₆ = (______)₁₀.


18. “Is it cold outside” is:


19. Who introduced the Boolean algebra?


20. Which device is used to back up the data?


21. A.B=B.A represents:


22. Following is the volatile memory:


23. Which of the following statement is a proposition? 


24. Express the binary number 1011 in decimal:


25. The process of understanding the problem is called ________ of the problem.


26. A. (B+C) = (A.B) + (A.C) is a representation of the:


27. How many digits are available in the decimal number system?


28. Which binary value equals 24?


29. The hexadecimal number 1016 is equal to:


30. The decimal equivalent of binary 1100001 is ________.


31. Convert 19₁₀ to binary:


32. Computer memory can store data:


33. The AND operator of Boolean algebra is denoted by:


34. One nibble = ______ bits


35. There are only _________ possible values for a Boolean variable.


36. MB stands for:


37. (E)₁₆ = (______)₁₀.


38. Which number system is used in our daily life?


39. 1 MB (Megabyte) is equivalent to:


40. Human being directly understand:


41. RAM is an example of:


42. The base of decimal number system is:


43. Any computing hardware capable of storing, porting, and extracting data is called.


44. The binary number 1 or 0 is represented by a:


45. Let Q = “It is not Friday today”, then ¬Q is:


46. Octal system has total ______ numbers.


47. The order of application of two separate terms is not important is not important in:


48. _________ manipulate everything in terms of binary number.


49. The numbers in the decimal number system are always from the _________ range.


50. Base of hexadecimal number is:


51. Choose the correct arrangement of memory units from smallest to largest.


52. _________ byte(s) of memory is required to store one character in the computer.


53. The binary value of 15₁₀ is:


54. TB stands for:


55. The number of digits in hexadecimal system is:


56. (A)₁₆ = (______)₁₀.


57. Most computers use _________ to represent integers.


58. How many bits are in one byte?


59. The NOT operator of Boolean algebra is denoted by:


60. In the decimal number system, the position of each digit is represented by the power of:


61. BIT stands for:


62. When the power is switched off _______ loses its contents:


63. 1 PB = ________:


64. Number “17” is equal to _______in binary system


65. Binary system has total ______ numbers.


66. The base of hexa decimal number system is:


67. The following is an example of non-volatile memory.


68. What is the full form of PB?


69. The hexadecimal number 10016 is equal to:


70. _________________ uses only two digits 0 and 1to represent any quantity.


71. F₁₆ = (______)₁₀.


72. Which of the given is used to check whether a proposition is true or false?


73. Express the binary number 101 in hexadecimal:


74. How many possible solutions are there for a problem?


75. The base of binary number system is:


76. Hexadecimal system has total ______ numbers


77. HDD stands for:


78. Which of the following is a binary number?


79. The base of hexadecimal number system is:


80. The following is the largest unit of memory in a computer?


81. (B)₁₆ = (______)₁₀.


82. _________ is a sentence that can either be true or false.


83. Which of the given law states that if the grouping of expressions changed then there is no change in results?


84. 1 Petabyte is equal to:


85. The memory is measured in.


86. ________ is the smallest unit of data.


87. What is the base of decimal number system?


88. “The order of application of two separate propositions not important” is stated by.


89. How many possible states can be represented via a bit?


90. Real data contain numbers, which may contains:


91. Any number with an exponent of one is equal to:


92. The storage devices like Hard disk, pen drives, and CDs can store data permanently and are called:


93. The word _______ refers to something spontaneous and unplanned solution.


94. 1KB = ________ bytes:


95. Which of the following is a binary number?


96. (D)₁₆ = (______)₁₀.


Short Questions

1. Convert (0010110010001101001)₂ to hexadecimal.
2. Convert (69610)₁₀ to Hexadecimal.
3. Convert (ABCD)16 to binary.
4. Convert 00011011₂ to decimal number.
5. Convert 1001 ₂ to decimal number.
6. Convert 10767₁₀ decimal to hexadecimal number.
7. Convert 129₁₀ Decimal to binary.
8. Convert 185₁₀ to hexadecimal number.
9. Convert 29₁₀ into binary
10. Convert 4710 Decimal to Binary.
11. Convert 5AF₁₆ to binary.
12. Convert 9DAC₁₆ to binary.
13. Convert A37E₁₆ to decimal.
14. Define AND operation by truth table. | Define AND operation.
15. Define AND Operator.
16. Define Bit.
17. Define Boolean constant.
18. Define Boolean expression.
19. Define byte.
20. Define compound Boolean proposition.
21. Define computer memory and write its types?
22. Define Decimal number system.
23. Define hexadecimal number system?
24. Define Hexadecimal?
25. Define logical expression.
26. Define Nibble.
27. Define Non-Volatile Memory (Secondary Storage)?
28. Define NOT Operator:
29. Define number system?
30. Define OR operation by truth table. | Define AND operation. 
31. Define OR Operator?
32. Define the Boolean Proposition.
33. Define the laws of Boolean algebra. Also list a few of them.
34. Define Truth Table?
35. Define truth values. 
36. Differentiate between authorized and unauthorized access.
37. Differentiate between decimal and hexadecimal number system?
38. Differentiate between volatile and non-volatile memory
39. Draw a truth table for NOT operator.
40. Give some examples of storage devices.
41. How data is represented in computer memory?
42. How do digital computers represent or process data?
43. How we convert a decimal number into binary?
44. List different types of the number system.
45. List down the elements of Boolean algebra.
46. List some examples of the proposition.
47. List the steps to convert a binary number to a decimal number.
48. List the steps to convert a decimal number to a binary number.
49. List the steps to convert a decimal number to a hexadecimal number.
50. Make truth table of A+B.
51. Make truth table of X+Y.
52. What are logical operators? Write the names of the logical operators.
53. What do you know about binary number system?
54. What do you know about conversion of Decimal into Binary?
55. What do you know about Data Representation in Computer Memory?
56. What do you know about the Measurement of size of a computer memory?
57. What do you know about Volatile Memory (Primary Storage)?
58. What do you mean by the base of a number system?
59. What do you mean by the Number Systems?
60. What is a Binary number system?
61. What is Boolean algebra?
62. What is Boolean variable? 
63. What is data privacy?
64. What is decimal number system?
65. What is meant by ASCII codes? 
66. What is Number System?
67. What is primary memory?
68. What is secondary memory?
69. What is the associative law of Boolean algebra?
70. What is the binary and decimal value of the letter A?
71. What is the Boolean proposition? Give Example.
72. What is the commutative law of Boolean algebra?
73. What is the distributive law of Boolean algebra?
74. What is the Hexadecimal number system?
75. What is the Identity law of Boolean algebra?
76. What is the most common number system?
77. What is the other name of the decimal number system?
78. What is the process of converting a binary number to a hexadecimal number? 
79. What is the process of converting a hexadecimal number to a binary number? 
80. What is the process of converting a hexadecimal number to a decimal number? 
81. What is the truth table? | State the function of truth table. 
82. What is the use of a storage device?
83. What is the use of AND operator?
84. What is the use of NOT operator?
85. What is the use of the OR operator?
86. Write down the ASCII code of the given characters.
87. Write down the difference between primary memory and secondary memory.
88. Write importance of binary system?
89. Write the truth table for X AND Y where X= It is sunny and Y= Today is Monday.

Long Questions


1. Define truth Table. Write truth table for AND , OR and NOT operators.
2. Describe OR and AND operation through truth table.
3. Differentiate between binary and hexadecimal number system. 
4. Differentiate between decimal and binary number system. 
5. Differentiate between decimal and hexadecimal number system. 
6. Discuss different laws of Boolean algebra in detail.
7. What are logical operators and logical expressions? Discuss various types of logical operators.
8. What are the different elements of Boolean algebra?
9. What is memory? What are its types? Explain.
10. What is number system? Explain binary, decimal and hexadecimal number system with examples.
11. What is number system? Write note on three number systems.
12. What is the process of converting decimal numbers to binary numbers and vice versa? Explain with examples.
13. What is the process of converting decimal numbers to Hexadecimal numbers and vice versa? Explain with examples.
14. What is the process of converting Hexadecimal numbers to binary numbers and vice versa? Explain with examples.
15. What is the truth table? Give examples of truth tables for different logical operators.

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