All Free Computer Science and IT MCQs with Answers

141. Directory in a directory is called__________?

• A. Sub directory
• B. Mini directory
• C. Junior Directory
• D. Active directory

Explanation: A directory contained inside another directory is called a subdirectory. It provides a lower-level structure for organising files within the parent directory.

142. PNG is a file extention of__________?

• A. Audio
• B. Video
• C. Image
• D. Flash

Explanation: PNG, or Portable Network Graphics, is an image format that supports lossless compression and transparency. It is not an audio, video, or Flash file extension.

143. The Speed of CPU is measured in_______?

• A. megahertz
• B. gigahertz
• C. Both A & B
• D. None of these

Explanation: CPU clock speed is expressed in hertz-based units, commonly megahertz for older processors and gigahertz for modern ones. Thus both MHz and GHz are valid units.

144. The output received on the display screen or in the audio or video form is called________?

• A. Hard Copy
• B. Soft Copy
• C. Light copy
• D. None of these

Explanation: Information displayed on a monitor or produced as audio or video is a soft copy because it is presented electronically rather than permanently printed. A printed result is a hard copy.

145. All the output which is Printed on a paper is called_________?

• A. Soft Copy
• B. Hard Copy
• C. Both A & B
• D. None of these

Explanation: Printed output is called a hard copy because it exists as a physical, durable paper record. Soft copy refers to electronic output viewed or played on a device.

146. A(n)___________system is a set of Programs containing instructions that coordinate all the activities among computer hardware resources?

• A. Operating
• B. Disk- Based
• C. Management
• D. Plateform

Explanation: An operating system is a collection of programs that manages hardware resources and coordinates activities between hardware and application software. The other terms do not name this essential system software.

147. __________is a process of encoding data and information into an unreadable form?

• A. Encryption
• B. Formatting
• C. Transmission
• D. Spooling

Explanation: Encryption converts readable data, called plaintext, into an unreadable form called ciphertext so unauthorised users cannot understand it. Formatting prepares storage media, while transmission only means sending data.

148. 8 Bits make up a_________?

• A. Byte
• B. Megabyte
• C. Kilobyte
• D. None

Explanation: A byte is the standard unit formed by 8 bits. Kilobytes and megabytes are larger units made up of many bytes.

149. When you press the _____ key by itself, it opens and closes the Start menu?

• A. Ctrl
• B. Shift
• C. Alt
• D. Window
• E. None

Explanation: Pressing the Windows key alone toggles the Start menu open or closed. Ctrl, Shift, and Alt are modifier keys and do not perform this action by themselves.

150. Window key + Shift + M

• A. Minimize all applications
• B. Utility Manager
• C. Un-Minimize all applications
• D. Show system properties

Explanation: Windows key plus Shift plus M restores the windows that were minimised with Windows key plus M. It is therefore the reverse of minimising all applications.