All Free Computer Science and IT MCQs with Answers

81. Device used to enter data or information into a computer include:__________?

• A. Keyboard
• B. Mouse
• C. Microphone
• D. All

Explanation: A keyboard, mouse, and microphone all enter data or information into a computer, so all the listed devices qualify. They are input devices even though they capture different forms of data.

82. How may types of computer according to the size?

• A. 4
• B. 3
• C. 2
• D. None of these

Explanation: Computers are commonly classified by size into four groups: microcomputers, minicomputers, mainframes and supercomputers.

83. 1 KB (Killobyte) is equal to ______?

• A. 1024 Megabytes
• B. 1024 bites
• C. 1024 bytes
• D. 100 bites

Explanation: A kilobyte is conventionally treated in computing as 1024 bytes. The spellings “Killobyte” and “bites” in the question are errors, not different units.

84. One MB (Megabyte) is equal to ________?

• A. 1024 Byte
• B. 1024 Killobytes
• C. 1000 Bits
• D. 1024 Gigabyte

Explanation: In the traditional binary-based measurement used in such exams, 1 megabyte equals 1024 kilobytes. Strict SI usage may use 1,000 kilobytes, but that is not the convention tested here.

85. 4 nibbles equals to__________?

• A. 2 bits
• B. 4 bits
• C. 2 bytes
• D. 4 bytes

Explanation: One nibble contains 4 bits, so four nibbles contain 16 bits. Since 8 bits make one byte, 16 bits equal 2 bytes.

86. Who is known as the Father of video games ?

• A. Karl Bens
• B. Ralph H. Bear
• C. Karoline Berliner
• D. Andrew Smith Bernard

Explanation: Ralph H. Baer is widely called the father of video games because he developed the ideas and prototype behind the first home video-game console. His surname is correctly spelled Baer, not Bear.

87. Most widely Spreaded computer virus was ________ ?

• A. I love you
• B. I hate you
• C. Oracle
• D. None of these

Explanation: The ILOVEYOU virus spread rapidly through email in 2000 by sending copies of itself to a victim’s contacts, making it one of the most widespread early email viruses.

88. The digital signals can be represented by________?

• A. 0 and 1
• B. Binary Codes
• C. High and Low
• D. All of Above

Explanation: Digital information uses discrete states commonly written as 0 and 1, represented electronically as low and high signals and expressed through binary codes. Thus all three descriptions refer to digital representation.

89. The first mechanical calculator was invented in which year?

• A. 1543
• B. 1642
• C. 1858
• D. 1972

Explanation: Blaise Pascal developed the Pascaline, generally regarded as the first mechanical calculator, in 1642. It used geared wheels to perform arithmetic operations.

90. What is the Name of Google's Parent Company?

• A. Alphabet Inc
• B. Amazon
• C. The Priceline Group
• D. None of these

Explanation: Alphabet Inc. became Google's parent company after Google's 2015 corporate restructuring. Google operates as a subsidiary under Alphabet.