Ace your NIELIT O Level Exam with our carefully selected important questions and clear answers. Ideal for quick revision, smart preparation, and guaranteed confidence on exam day.
Important Questions and Answers for NIELIT O Level Exam
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Answer: Versatility
Explanation: Computers are capable of performing a wide range of tasks, unlike calculators which are limited to arithmetic functions.
Answer: ENIAC
Explanation: ENIAC (Electronic Numerical Integrator and Computer) was the first general-purpose electronic digital computer.
Answer: Microcomputer
Explanation: Microcomputers are typically used as client systems in networks due to their affordability and functionality.
Answer: Memory, Input/Output, CPU
Explanation: These are the essential components for data processing and communication in a computer.
Answer: VLSI
Explanation: Very-Large-Scale Integration (VLSI) allowed thousands of transistors on a single chip, defining the 4th generation.
Answer: Peripheral Device
Explanation: Peripherals like printers and scanners extend the system’s capabilities.
Answer: Floating Point Operations per Second
Explanation: FLOPS is used to measure the computing speed of supercomputers.
Answer: CPU Usage
Explanation: Multiprogramming allows efficient CPU use by running multiple programs simultaneously.
Answer: Control Unit
Explanation: The Control Unit (CU) directs operations within the computer by decoding instructions.
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Answer: First, information is transferred to the main memory and from there, the CPU reads it
Explanation: CPUs cannot directly access secondary memory; data must be in RAM first.
Answer: To decode program instructions
Explanation: The CU fetches and decodes instructions to coordinate hardware actions.
Answer: Laser Printer
Explanation: Laser printers use a laser beam to form images on a drum using toner.
Answer: Control Unit and ALU
Explanation: The CPU includes the Control Unit and Arithmetic Logic Unit (ALU).
Answer: Photo-sensitive drum
Explanation: A photoconductive drum is used to transfer toner to paper.
Answer: Laser Printer
Explanation: Laser printers use electro-photographic printing via a laser beam.
Answer: Backup
Explanation: Backup systems protect data against loss due to failure.
Answer: ROM
Explanation: BIOS is stored in Read-Only Memory (ROM), which is non-volatile.
Answer: Non-volatile storage
Explanation: HDDs retain data even when power is off.
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Answer: Assembler
Explanation: Assemblers convert assembly language into machine code.
Answer: All of the above
Explanation: AutoCAD, Photoshop, and CorelDraw are proprietary (paid, closed source).
Answer: All of the above
Explanation: All are closed source—code is not publicly accessible.
Answer: Virus
Explanation: Viruses can damage systems and compromise user data.
Answer: By Operating System
Explanation: BIOS initiates hardware during boot, then hands control to the OS.
Answer: Hard Disk
Explanation: Hard disks store data permanently.
Answer: Plotter
Explanation: Plotters produce large-scale, high-precision graphics on paper.
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