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Latest NIELIT Scientific Assistant IT Exam Question (Objective Questions), MCQ in English

Subjects : Technical Subject (Information Technology), Generic Area

Question Bank NIELIT Scientific Assistant (IT) Exam - English
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Technical Subject (Information Technology)

Question 1Single Answer
Which of the following is a common method for interfacing input/output devices with the CPU and memory?
  1. A
    Arithmetic Logic Unit (ALU)
  2. B
    Control Unit
  3. C
    I/O Modules
  4. D
    Registers
Question 2Single Answer
Keyboards, mice, and printers are examples of:
  1. A
    Memory devices
  2. B
    Processing units
  3. C
    Input/output devices
  4. D
    Storage devices
Question 3Single Answer
The process by which an I/O device informs the CPU that it requires attention is called:
  1. A
    Polling
  2. B
    Interrupt
  3. C
    DMA
  4. D
    Addressing
Question 4Single Answer
Which of the following is an advantage of using interrupts for I/O operations?
  1. A
    The CPU continuously checks the status of I/O devices.
  2. B
    The CPU can perform other tasks while waiting for I/O operations to complete.
  3. C
    Data transfer is directly managed by the CPU.
  4. D
    It simplifies the design of I/O modules.
Question 5Single Answer
What is Direct Memory Access (DMA)?
  1. A
    A method where the CPU directly accesses I/O devices.
  2. B
    A technique that allows I/O devices to transfer data directly to or from memory without CPU intervention.
  3. C
    A type of high-speed memory used for I/O buffering.
  4. D
    A specific instruction used for data transfer between registers.
Question 6Single Answer
Which component typically initiates a DMA transfer?
  1. A
    CPU
  2. B
    Main Memory
  3. C
    I/O Controller
  4. D
    Cache Memory
Question 7Single Answer
What is a major advantage of DMA over programmed I/O?
  1. A
    Simpler hardware design
  2. B
    Lower CPU utilization
  3. C
    Faster interrupt handling
  4. D
    More efficient register allocation
Question 8Single Answer
A set of lines used to transfer data between the CPU, memory, and peripherals is called a:
  1. A
    Register file
  2. B
    Control unit
  3. C
    Bus
  4. D
    Pipeline
Question 9Single Answer
Which type of bus is specifically designed for high-speed communication between the CPU and memory?
  1. A
    Expansion bus
  2. B
    System bus
  3. C
    I/O bus
  4. D
    Control bus
Question 10Single Answer
What is the role of an I/O controller or interface?
  1. A
    To perform arithmetic and logical operations.
  2. B
    To manage the execution of instructions.
  3. C
    To handle the communication between the CPU/memory and peripheral devices.
  4. D
    To store frequently accessed data.
Question 11Single Answer
What is instruction pipelining?
  1. A
    Executing multiple instructions simultaneously on different data.
  2. B
    Overlapping the execution of multiple instructions.
  3. C
    Fetching and decoding instructions in parallel.
  4. D
    Dividing a single instruction into multiple stages for faster execution.
Question 12Single Answer
Which of the following is a typical stage in an instruction pipeline?
  1. A
    Data storage
  2. B
    Address calculation
  3. C
    Instruction fetch
  4. D
    Power management
Question 13Single Answer
In a typical instruction pipeline, after the Fetch stage, what is the next stage?
  1. A
    Execute
  2. B
    Write Back
  3. C
    Decode
  4. D
    Memory Access
Question 14Single Answer
What is a pipeline hazard?
  1. A
    A condition that allows the pipeline to operate at maximum speed.
  2. B
    A situation that prevents the next instruction in the instruction stream from executing during its designated clock cycle. 1
  3. C
    A type of error that occurs during instruction decoding.
  4. D
    A feature that enhances the performance of the memory system.
Question 15Single Answer
A data hazard occurs when:
  1. A
    Multiple instructions try to access the same memory location.
  2. B
    The pipeline's structure cannot support certain instruction sequences.
  3. C
    An instruction depends on the result of a previous instruction that is still in the pipeline.
  4. D
    There is a branch instruction that changes the program counter.
Question 16Single Answer
Which of the following is a common technique to handle data hazards?
  1. A
    Branch prediction
  2. B
    Instruction reordering
  3. C
    Forwarding (or bypassing)
  4. D
    Cache coherence protocols
Question 17Single Answer
A control hazard arises from:
  1. A
    Dependencies between data operands.
  2. B
    Conflicts in accessing hardware resources.
  3. C
    Branch instructions or other instructions that change the program flow.
  4. D
    Errors in the instruction decoding stage.
Question 18Single Answer
What is branch prediction used for in pipelining?
  1. A
    To resolve data dependencies.
  2. B
    To avoid structural hazards.
  3. C
    To reduce the performance penalty of control hazards.
  4. D
    To improve cache hit rates.
Question 19Single Answer
A structural hazard occurs when:
  1. A
    Two instructions need the same hardware resource at the same time.
  2. B
    There is a dependency between the operands of two consecutive instructions.
  3. C
    A branch instruction causes a change in the program counter.
  4. D
    The data required by an instruction is not available in the cache.
Question 20Single Answer
How can structural hazards be resolved?
  1. A
    By using forwarding techniques.
  2. B
    By implementing branch prediction.
  3. C
    By providing separate hardware resources for different pipeline stages.
  4. D
    By reordering the instructions.
Question 21Single Answer
What is the purpose of cache memory?
  1. A
    To provide long-term storage for data.
  2. B
    To directly execute instructions.
  3. C
    To speed up memory access by storing frequently used data.
  4. D
    To manage the allocation of memory to different processes.
Question 22Single Answer
Which principle of locality does cache memory exploit?
  1. A
    Data integrity
  2. B
    Temporal and spatial locality
  3. C
    Memory protection
  4. D
    Cache coherence
Question 23Single Answer
In which type of cache mapping can any block of main memory be placed in any block of the cache?
  1. A
    Direct mapping
  2. B
    Associative mapping
  3. C
    Set-associative mapping
  4. D
    Fully mapped
Question 24Single Answer
In direct mapping, each block of main memory can be placed in:
  1. A
    Any block of the cache.
  2. B
    Only one specific block of the cache.
  3. C
    A limited set of blocks in the cache.
  4. D
    The block with the least recently used data.
Question 25Single Answer
Set-associative mapping is a compromise between:
  1. A
    Speed and cost of cache.
  2. B
    Capacity and volatility of memory.
  3. C
    Direct mapping and associative mapping.
  4. D
    Read and write access times.
Question 26Single Answer
What is a cache hit?
  1. A
    When the requested data is found in the main memory.
  2. B
    When the requested data is found in the cache memory.
  3. C
    When there is an error during data transfer to the cache.
  4. D
    When the cache is full.
Question 27Single Answer
What is a cache miss?
  1. A
    When the CPU cannot access the cache.
  2. B
    When the requested data is not found in the cache memory.
  3. C
    When the main memory is full.
  4. D
    When there is a power failure.
Question 28Single Answer
Which of the following is a common cache replacement policy?
  1. A
    First-In, First-Out (FIFO)
  2. B
    Last-In, First-Out (LIFO)
  3. C
    Least Recently Used (LRU)
  4. D
    Most Frequently Used (MFU)
Question 29Single Answer
What is the purpose of memory management?
  1. A
    To control the flow of data between the CPU and I/O devices.
  2. B
    To manage the allocation and deallocation of memory space to programs.
  3. C
    To improve the speed of data access in secondary storage.
  4. D
    To ensure the security of data stored in memory.
Question 30Single Answer
Which of the following is a memory management technique that divides memory into fixed-size blocks?
  1. A
    Paging
  2. B
    Segmentation
  3. C
    Contiguous allocation
  4. D
    Dynamic partitioning
Question 31Single Answer
In paging, the fixed-size blocks of main memory are called:
  1. A
    Segments
  2. B
    Frames
  3. C
    Pages
  4. D
    Blocks
Question 32Single Answer
In paging, the fixed-size blocks of logical memory are called:
  1. A
    Segments
  2. B
    Frames
  3. C
    Pages
  4. D
    Blocks
Question 33Single Answer
Segmentation divides memory into:
  1. A
    Fixed-size blocks.
  2. B
    Variable-size logical units.
  3. C
    Equal partitions.
  4. D
    Cache lines.
Question 34Single Answer
What is virtual memory?
  1. A
    A type of very fast cache memory.
  2. B
    A memory management technique that allows processes to execute even if they are not entirely in main memory.
  3. C
    The physical RAM installed in a computer.
  4. D
    Memory directly accessed by I/O devices.
Question 35Single Answer
What is a Translation Lookaside Buffer (TLB)?
  1. A
    A cache for recently used data from main memory.
  2. B
    A cache for recently used page table entries.
  3. C
    A buffer for storing instructions before they are executed.
  4. D
    A register that holds the address of the next instruction to be fetched.
Question 36Single Answer
Which of the following is an example of a magnetic secondary storage device?
  1. A
    Solid State Drive (SSD)
  2. B
    DVD-ROM
  3. C
    Hard Disk Drive (HDD)
  4. D
    Blu-ray Disc
Question 37Single Answer
Which of the following is an example of an optical secondary storage device?
  1. A
    Magnetic tape
  2. B
    Floppy disk
  3. C
    CD-ROM
  4. D
    USB flash drive
Question 38Single Answer
Solid State Drives (SSDs) primarily use which type of memory for data storage?
  1. A
    Magnetic platters
  2. B
    Optical discs
  3. C
    Flash memory
  4. D
    Magnetic tape
Question 39Single Answer
Which type of secondary storage generally offers the fastest data access speeds?
  1. A
    Magnetic tape
  2. B
    Hard Disk Drive (HDD)
  3. C
    Solid State Drive (SSD)
  4. D
    DVD-ROM
Question 40Single Answer
What is sequential access in the context of secondary storage?
  1. A
    Accessing data in any order.
  2. B
    Accessing data in a specific linear order.
  3. C
    Accessing multiple data blocks simultaneously.
  4. D
    Accessing data based on its physical address.
Question 41Single Answer
Magnetic tapes primarily use which data access method?
  1. A
    Random access
  2. B
    Direct access
  3. C
    Sequential access
  4. D
    Indexed access
Question 42Single Answer
Hard disk drives typically use which data access method?
  1. A
    Sequential access
  2. B
    Random access (direct access)
  3. C
    Content-based access
  4. D
    Associative access
Question 43Single Answer
Access time for a hard disk drive is primarily determined by:
  1. A
    Data transfer rate only.
  2. B
    Seek time, rotational latency, and data transfer rate.
  3. C
    Cache size and bus speed.
  4. D
    Platter size and number of heads.
Question 44Single Answer
What is seek time in a hard disk drive?
  1. A
    The time it takes for the desired sector to rotate under the read/write head.
  2. B
    The time it takes for the read/write head to move to the correct track.
  3. C
    The rate at which data can be transferred to or from the disk.
  4. D
    The time it takes for the disk to spin up to its operating speed.
Question 45Single Answer
What is rotational latency in a hard disk drive?
  1. A
    The time it takes for the read/write head to move to the correct track.
  2. B
    The average time it takes for the desired sector to rotate under the read/write head after the head has reached the correct track.
  3. C
    The speed at which the disk platters rotate (measured in RPM).
  4. D
    The time it takes to transfer data between the disk and the system bus.
Question 46Single Answer
Data transfer rate in secondary storage refers to:
  1. A
    The time taken to locate a specific piece of data.
  2. B
    The amount of data that can be moved between the storage device and the computer per unit of time.
  3. C
    The storage capacity of the device.
  4. D
    The physical size of the storage medium.
Question 47Single Answer
Which of the following secondary storage devices is non-volatile?
  1. A
    RAM
  2. B
    Cache memory
  3. C
    Hard Disk Drive (HDD)
  4. D
    Registers
Question 48Single Answer
What is the primary advantage of using RAID (Redundant Array of Independent Disks)?
  1. A
    Increased processing speed
  2. B
    Improved memory capacity
  3. C
    Enhanced data reliability and/or performance
  4. D
    Reduced power consumption
Question 49Single Answer
Which type of secondary storage is commonly used for archival purposes due to its high capacity and relatively low cost per bit?
  1. A
    Solid State Drive (SSD)
  2. B
    DVD-RW
  3. C
    Magnetic Tape
  4. D
    USB Flash Drive
Question 50Single Answer
The performance of secondary storage devices is often measured in terms of:
  1. A
    Clock speed and instruction cycle time.
  2. B
    Cache hit rate and TLB miss rate.
  3. C
    Access time, data transfer rate, and storage capacity.
  4. D
    Number of cores and threads.
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