Results
#1. A logic gate that outputs 1 only when both inputs are 1 is the:
An AND gate outputs 1 only when all its inputs are 1. Otherwise it outputs 0.
#2. The binary number 110011 in decimal is:
Converting binary 110011 to decimal gives 51. Each binary position is a power of 2.
#3. The octal number 20 in decimal is:
Converting octal 20 to decimal gives 16. Octal uses base 8.
#4. The octal number 7 in decimal is:
Converting octal 7 to decimal gives 7. Octal uses base 8.
#5. The binary number 101 in decimal is:
Converting binary 101 to decimal gives 5. Each binary position is a power of 2.
#6. The octal number 77 in decimal is:
Converting octal 77 to decimal gives 63. Octal uses base 8.
#7. In hexadecimal, the letter A represents the decimal value:
In hexadecimal, A stands for decimal 10. The letters A to F represent 10 to 15.
#8. The output of an XOR gate with inputs 1 and 0 is:
An XOR gate outputs 1 when inputs differ. With inputs 1 and 0, the output is 1.
#9. The process of representing data, such as characters or images, as numbers is called:
Encoding represents data such as text or images as numbers a computer can store. ASCII and Unicode are examples of character encoding.
#10. Each hexadecimal digit corresponds to how many binary digits?
Each hexadecimal digit corresponds to exactly four binary digits, because 16 equals 2 to the power 4. This makes conversion straightforward.
#11. A single binary digit is called a:
A single binary digit, either 0 or 1, is called a bit. It is the smallest unit of data.
#12. The octal number 17 in decimal is:
Converting octal 17 to decimal gives 15. Octal uses base 8.
#13. The hexadecimal number FF in decimal is:
Converting hexadecimal FF to decimal gives 255. Hexadecimal uses base 16.
#14. The hexadecimal number 64 in decimal is:
Converting hexadecimal 64 to decimal gives 100. Hexadecimal uses base 16.
#15. A logic gate operates on inputs that are either:
Logic gates operate on binary inputs of 0 or 1. They produce a binary output.
#16. The decimal number 5 in binary is:
Converting decimal 5 to binary gives 101. Binary uses base 2.
#17. The output of a NOR gate with inputs 0 and 0 is:
A NOR gate outputs the inverse of OR. With both inputs 0, OR gives 0, so NOR gives 1.
#18. Binary is well suited to computers because electronic circuits easily represent:
Binary suits computers because electronic circuits can easily represent two states, such as on and off. This maps directly to 1 and 0.
#19. A logic gate with a single input that reverses its value is the:
A NOT gate, or inverter, has one input and outputs its opposite. An input of 1 gives 0, and 0 gives 1.
#20. The base of the octal number system is:
The octal system has a base of 8, using digits 0 to 7. Each position is a power of 8.
#21. The binary number 111 in decimal is:
Converting binary 111 to decimal gives 7. Each binary position is a power of 2.
#22. The decimal number 42 in binary is:
Converting decimal 42 to binary gives 101010. Binary uses base 2.
#23. The hexadecimal number B in decimal is:
Converting hexadecimal B to decimal gives 11. Hexadecimal uses base 16.
#24. The output of a NOT gate with input 1 is:
A NOT gate reverses its input. An input of 1 gives an output of 0.
#25. The decimal number 8 in octal is:
Converting decimal 8 to octal gives 10. Octal uses base 8.
#26. The binary number 1001 in decimal is:
Converting binary 1001 to decimal gives 9. Each binary position is a power of 2.
#27. The octal number 40 in decimal is:
Converting octal 40 to decimal gives 32. Octal uses base 8.
#28. The number system with a base of 10, used in everyday counting, is:
The decimal system has a base of 10 and uses digits 0 to 9. It is the everyday counting system.
#29. The decimal number 15 in hexadecimal is:
Converting decimal 15 to hexadecimal gives F. Hexadecimal uses base 16.
#30. The decimal number 255 in hexadecimal is:
Converting decimal 255 to hexadecimal gives FF. Hexadecimal uses base 16.
#31. The digits used in the octal system range from:
The octal system uses digits 0 to 7. It does not use 8 or 9.
#32. The binary number 11001 in decimal is:
Converting binary 11001 to decimal gives 25. Each binary position is a power of 2.
#33. The decimal number 9 in octal is:
Converting decimal 9 to octal gives 11. Octal uses base 8.
#34. The octal number 25 in decimal is:
Converting octal 25 to decimal gives 21. Octal uses base 8.
#35. The output of an XOR gate with inputs 1 and 1 is:
An XOR gate outputs 1 only when inputs differ. With two equal inputs of 1, the output is 0.
#36. The decimal number 13 in binary is:
Converting decimal 13 to binary gives 1101. Binary uses base 2.
#37. The decimal number 7 in binary is:
Converting decimal 7 to binary gives 111. Binary uses base 2.
#38. The binary number 100000 in decimal is:
Converting binary 100000 to decimal gives 32. Each binary position is a power of 2.
#39. The largest digit that can appear in a binary number is:
The largest digit in binary is 1, since binary uses only 0 and 1. There is no digit 2 in binary.
#40. Hexadecimal is often used by programmers because it:
Hexadecimal represents long binary values compactly, since each hex digit maps to four bits. This makes it convenient for programmers.
#41. The output of a NOT gate with input 0 is:
A NOT gate reverses its input. An input of 0 gives an output of 1.
#42. The decimal number 10 in binary is:
Converting decimal 10 to binary gives 1010. Binary uses base 2.
#43. A truth table is used to show:
A truth table lists all possible input combinations of a logic circuit and the resulting outputs. It fully describes the circuit’s behaviour.
#44. The decimal number 63 in binary is:
Converting decimal 63 to binary gives 111111. Binary uses base 2.
#45. The hexadecimal number A in decimal is:
Converting hexadecimal A to decimal gives 10. Hexadecimal uses base 16.
#46. The decimal number 17 in octal is:
Converting decimal 17 to octal gives 21. Octal uses base 8.
#47. The decimal number 20 in octal is:
Converting decimal 20 to octal gives 24. Octal uses base 8.
#48. The hexadecimal number 1F in decimal is:
Converting hexadecimal 1F to decimal gives 31. Hexadecimal uses base 16.
#49. The decimal number 12 in hexadecimal is:
Converting decimal 12 to hexadecimal gives C. Hexadecimal uses base 16.
#50. The hexadecimal number 2A in decimal is:
Converting hexadecimal 2A to decimal gives 42. Hexadecimal uses base 16.
#51. The number of distinct characters representable by standard 7-bit ASCII is:
Seven bits give 2 to the power 7, which is 128 combinations. Standard ASCII therefore represents 128 characters.
#52. The octal number 64 in decimal is:
Converting octal 64 to decimal gives 52. Octal uses base 8.
#53. The decimal number 32 in octal is:
Converting decimal 32 to octal gives 40. Octal uses base 8.
#54. The two states used in digital logic, often called high and low, correspond to:
Digital logic uses two states, commonly represented as 1 and 0, or high and low. These correspond to two voltage levels.
#55. The hexadecimal number C8 in decimal is:
Converting hexadecimal C8 to decimal gives 200. Hexadecimal uses base 16.
#56. In ASCII, the codes for the uppercase letters differ from those for lowercase letters, so A and a have:
In ASCII, uppercase and lowercase letters have different codes. A and a are represented by different numbers.
#57. In a binary number, moving one position to the left multiplies the place value by:
In binary, each position to the left has a place value twice the one before. This reflects the base of 2.
#58. The digits and letters used in hexadecimal range from:
Hexadecimal uses digits 0 to 9 and letters A to F, giving sixteen symbols. This matches its base of 16.
#59. The base of the hexadecimal number system is:
The hexadecimal system has a base of 16. It uses digits 0 to 9 and letters A to F.
#60. In hexadecimal, the letter F represents the decimal value:
In hexadecimal, F stands for decimal 15. It is the largest single hexadecimal digit.
#61. The output of an OR gate with inputs 1 and 0 is:
An OR gate outputs 1 when at least one input is 1. With inputs 1 and 0 the output is 1.
#62. The decimal number 25 in binary is:
Converting decimal 25 to binary gives 11001. Binary uses base 2.
#63. Each octal digit corresponds to how many binary digits?
Each octal digit corresponds to three binary digits, because 8 equals 2 to the power 3. Octal groups bits in threes.
#64. The decimal number 16 in hexadecimal is:
Converting decimal 16 to hexadecimal gives 10. Hexadecimal uses base 16.
#65. The code that represents characters as numbers, widely used in computing, is:
ASCII assigns a numeric code to each character. It allows text to be represented in binary.
#66. The decimal number 63 in octal is:
Converting decimal 63 to octal gives 77. Octal uses base 8.
#67. Computers represent all data internally using the:
Computers represent all data internally in binary, using ones and zeros. This suits their two-state electronic circuits.
#68. The decimal number 200 in hexadecimal is:
Converting decimal 200 to hexadecimal gives C8. Hexadecimal uses base 16.
#69. A logic gate that outputs 1 when at least one input is 1 is the:
An OR gate outputs 1 when one or more inputs are 1. It outputs 0 only when all inputs are 0.
#70. The decimal number 10 in hexadecimal is:
Converting decimal 10 to hexadecimal gives A. Hexadecimal uses base 16.
#71. The abbreviation ASCII stands for:
ASCII stands for American Standard Code for Information Interchange. It is a character-encoding standard.
#72. A character-encoding standard designed to represent text from most of the world’s writing systems is:
Unicode is a character-encoding standard covering most of the world’s writing systems. It extends far beyond ASCII.
#73. The output of an OR gate with inputs 0 and 0 is:
An OR gate outputs 0 only when all inputs are 0, so the output here is 0.
#74. The decimal number 100 in binary is:
Converting decimal 100 to binary gives 1100100. Binary uses base 2.
#75. The output of an AND gate with inputs 1 and 0 is:
An AND gate outputs 1 only when both inputs are 1. With inputs 1 and 0 the output is 0.
#76. The gate that produces the inverse of the OR output is the:
A NOR gate outputs the inverse of an OR gate. It outputs 1 only when all inputs are 0.
#77. The decimal number 15 in octal is:
Converting decimal 15 to octal gives 17. Octal uses base 8.
#78. The decimal number 31 in hexadecimal is:
Converting decimal 31 to hexadecimal gives 1F. Hexadecimal uses base 16.
#79. In the binary number 1011, the rightmost digit represents the value:
In binary, the rightmost position represents 2 to the power 0, which is 1. Positions increase in powers of 2 to the left.
#80. The output of a NAND gate with inputs 1 and 1 is:
A NAND gate outputs the inverse of AND. With both inputs 1, AND gives 1, so NAND gives 0.
#81. The decimal number 100 in octal is:
Converting decimal 100 to octal gives 144. Octal uses base 8.
#82. The base of the binary number system is:
The binary system has a base of 2, using two digits. Each position represents a power of 2.
#83. Standard ASCII uses how many bits to represent each character?
Standard ASCII uses 7 bits per character, allowing 128 different characters. Extended ASCII uses 8 bits.
#84. The decimal number 17 in binary is:
Converting decimal 17 to binary gives 10001. Binary uses base 2.
#85. The number system that uses only the digits 0 and 1 is:
The binary system uses only 0 and 1. It is the basis of digital computing.
#86. The output of an AND gate with inputs 1 and 1 is:
An AND gate outputs 1 only when both inputs are 1, so the output here is 1.
#87. The hexadecimal number F in decimal is:
Converting hexadecimal F to decimal gives 15. Hexadecimal uses base 16.
#88. The hexadecimal number 10 in decimal is:
Converting hexadecimal 10 to decimal gives 16. Hexadecimal uses base 16.
#89. The binary number 10110 in decimal is:
Converting binary 10110 to decimal gives 22. Each binary position is a power of 2.
#90. The decimal number 7 in octal is:
Converting decimal 7 to octal gives 7. Octal uses base 8.
#91. The gate that outputs 1 only when its two inputs are different is the:
An exclusive-OR gate outputs 1 only when its inputs differ. Equal inputs give an output of 0.
#92. The octal number 100 in decimal is:
Converting octal 100 to decimal gives 64. Octal uses base 8.
#93. The octal number 10 in decimal is:
Converting octal 10 to decimal gives 8. Octal uses base 8.
#94. The hexadecimal number AB in decimal is:
Converting hexadecimal AB to decimal gives 171. Hexadecimal uses base 16.
#95. The decimal number 64 in octal is:
Converting decimal 64 to octal gives 100. Octal uses base 8.
#96. The decimal number 64 in hexadecimal is:
Converting decimal 64 to hexadecimal gives 40. Hexadecimal uses base 16.
#97. The decimal number 171 in hexadecimal is:
Converting decimal 171 to hexadecimal gives AB. Hexadecimal uses base 16.
#98. The decimal number 31 in binary is:
Converting decimal 31 to binary gives 11111. Binary uses base 2.
#99. The binary number 11111 in decimal is:
Converting binary 11111 to decimal gives 31. Each binary position is a power of 2.
#100. Logic gates are the basic building blocks of:
Logic gates are the basic building blocks of digital circuits. They implement logical operations on binary inputs.
#101. The gate that produces the inverse of the AND output is the:
A NAND gate outputs the inverse of an AND gate. It outputs 0 only when all inputs are 1.
#102. The decimal number 26 in hexadecimal is:
Converting decimal 26 to hexadecimal gives 1A. Hexadecimal uses base 16.
#103. The largest single digit in the decimal system is:
The largest single digit in decimal is 9. The value 10 requires two digits.
#104. The octal number 12 in decimal is:
Converting octal 12 to decimal gives 10. Octal uses base 8.
#105. The binary number 1010 in decimal is:
Converting binary 1010 to decimal gives 10. Each binary position is a power of 2.