All Free Computer Science and IT MCQs with Answers

61. In Computer, Bus is set of?

• A. Circuits
• B. Wires
• C. Registers
• D. Bulbs

Explanation: A bus is a group of electrical wires or pathways that carries data, addresses, and control signals between computer components. Registers and bulbs are components, not the definition of a bus.

62. Which is known as temporary memory?

• A. ROM
• B. Hard Disk
• C. Registers
• D. Circuits

Explanation: CPU registers are very small, high-speed storage locations used temporarily while instructions are being processed. ROM and hard disks retain information, so they are not temporary storage.

63. Temporary storage place for information in a computer is called:

• A. Back Up
• B. Buffer
• C. Binary file
• D. Data recorder

Explanation: A buffer is a temporary storage area that holds data while it is being transferred between devices or processes operating at different speeds. Backup and binary file describe storage or file forms, not this temporary holding area.

64. The unit of measurement of a word length is?

• A. Metre
• B. Byte
• C. Bits
• D. Millimetre

Explanation: A computer's word length is measured in bits, such as 16-bit, 32-bit, or 64-bit. Bytes measure storage capacity, not the number of bits processed as one word.

65. _________ is a type of computing that performs computation, storage and even applications as a service across a network.

• A. Cloud Computing
• B. Distributed Computing
• C. Parallel Computing
• D. Virtual Computing

Explanation: Cloud computing delivers computing resources such as storage, processing, and applications as services over a network, usually the Internet. Distributed and parallel computing describe how processing is organised, not necessarily how it is offered as a service.

66. Programs that duplicate the functionality of one system on another system is known as

• A. Emulators
• B. Simulators
• C. Evaluators
• D. PCB

Explanation: An emulator reproduces the functionality or behaviour of one system on another system, allowing software designed for the original system to run there. A simulator generally models behaviour without necessarily reproducing the complete operating environment.

67. Cache memory works on the principle of ___________ .

• A. Locality of data
• B. Locality of reference
• C. Locality of Memory
• D. Locality of Memory & refer

Explanation: Cache memory relies on locality of reference: recently used data and nearby data are likely to be used again soon. This includes temporal locality and spatial locality.

68. _________ changes each time it is installed to avoid detection by antivirus software.

• A. Polymorphic virus
• B. Worm
• C. Logic bomb
• D. Trojan horse

Explanation: A polymorphic virus changes its code or appearance, often through encryption or mutation, to make signature-based antivirus detection more difficult. Worms spread independently, but do not specifically change form for this purpose.

69. Related to computers, what is 'Wetware' ?

• A. Computer programs
• B. Circuitory
• C. Human brain
• D. Chemical storage devices

Explanation: Wetware refers to the human element of computing, especially the brain and nervous system, by analogy with hardware and software. It does not mean programs or electronic circuitry.

70. In the memory hierarchy the fastest memory is?

• A. Cache
• B. SRAM
• C. Registers
• D. DRAM

Explanation: CPU registers are the fastest storage locations because they are inside the processor and are accessed directly during instruction execution. Cache is faster than main memory but generally slower than registers.