All Free Computer Science and IT MCQs with Answers

11. ALU is____________?

• A. Arithmetic Logic Unit
• B. Array Logic Unit
• C. Application Logic Unit
• D. None of above

Explanation: The ALU is the Arithmetic Logic Unit, the CPU component that performs arithmetic operations and logical comparisons. Control and memory functions are handled by other parts of the computer system.

12. The computer that process both analog and digital is called____________?

• A. Analog computer
• B. Digital computer
• C. Hybrid computer
• D. Mainframe computer

Explanation: A hybrid computer combines analog processing, useful for continuous physical values, with digital processing, useful for discrete data and precise control. Analog-only and digital-only computers use one processing approach.

13. Analog computer works on the supply of ____________?

• A. Continuous electrical pulses
• B. Electrical pulses but not continuous
• C. Magnetic strength
• D. None of the above

Explanation: An analog computer processes continuously varying physical quantities, commonly represented by continuous electrical signals. Digital computers instead use discrete, separate values or pulses.

14. which one is Digital device, select from the choices below?

• A. Digital Clock
• B. Automobile analog speed meter
• C. Clock with a dial and two hands
• D. All of them

Explanation: A digital clock displays time as discrete numerical values, so it is a digital device. A dial-based speedometer and a clock with hands represent continuously varying values and are analog devices.

15. The brain of any computer system is___________?

• A. ALU
• B. Memory
• C. CPU
• D. Control unit

Explanation: The CPU is called the computer's brain because it interprets and executes instructions and coordinates other components. The ALU and Control Unit are important parts of the CPU, but neither represents the complete processing unit.

16. 1 Gigabyte is equal to ____________?

• A. 1024 bits
• B. 1032 megabytes
• C. 1024 kilobytes
• D. 1024 megabytes

Explanation: Using the common binary memory convention, 1 gigabyte equals 1024 megabytes, and each megabyte contains 1024 kilobytes. Therefore, the correct conversion is option d.

17. If a computer has more than one processor then it is known as__________?

• A. Uni-process
• B. Multiprocessor
• C. Multi-threaded
• D. Multi-programming

Explanation: A computer containing two or more processors is called a multiprocessor system. Multithreading and multiprogramming concern how tasks are managed, not the number of physical processors.

18. The basic operations performed by a computer are__________?

• A. Arithmetic operation
• B. Logical operation
• C. Storage and relative
• D. All the above

Explanation: Computers perform arithmetic and logical processing and also store and retrieve data. Option c appears to contain a typographical error, with “relative” evidently intended to mean “retrieval,” so all the listed operation categories are covered by option d.

19. Who is the father of Computer?

• A. Allen Turing
• B. Charles Babbage
• C. Simur Cray
• D. Augusta Adaming

Explanation: Charles Babbage is called the father of the computer because his Analytical Engine introduced many ideas used in modern general-purpose computers. Alan Turing contributed foundational theory but is not the conventional answer to this title.

20. The term 'Computer' is derived from__________?

• A. Latin
• B. German
• C. French
• D. Arabic

Explanation: The word computer comes from the Latin computare, meaning to calculate or reckon. This origin relates to the machine's early association with numerical calculation.