Free Data Structures and Algorithms MCQs with Answers

• A. Four bits
• B. Eight bits
• C. Twelve bits
• D. Sixteen bits

Explanation: A byte is the standard unit formed by eight binary digits, or bits. Four bits form a nibble, not a byte.

• A. java.util.LinkedList
• B. java.util.TreeMap
• C. java.util.SortedSet
• D. java.util.HashSet

Explanation: TreeMap stores key-value pairs and keeps its keys sorted according to their natural ordering, such as alphabetical or numeric order.

• A. Package
• B. Wrapper
• C. Java object
• D. Collection object

Explanation: A collection object is designed to hold a group of objects, such as a list, set, or queue.

• A. A computer language
• B. A branch of mathematics
• C. A step by step procedure for solving a problem
• D. All of the above

Explanation: An algorithm is a finite, ordered sequence of unambiguous steps that transforms input into a solution.

• A. RAM
• B. ROM
• C. ERROM
• D. EEPROM

Explanation: RAM is temporary and volatile, so its contents disappear when power is removed.

• A. RAM
• B. mother board
• C. secondary storage device
• D. primary storage device

Explanation: Secondary storage devices such as hard drives, SSDs, and optical discs retain data after shutdown.

• A. Paste
• B. Open
• C. Memory
• D. Pocket

Explanation: Memory is the computer’s storage area for data and instructions currently being used or processed.

• A. integrated circuit
• B. mother board
• C. processor
• D. microchip

Explanation: The motherboard is the main circuit board that connects the processor, memory, storage interfaces, and other components.

• A. cannot be erased and rewritten
• B. has more storage capacity than CD-R
• C. holds less data than a floppy disk
• D. can be written only once

Explanation: A CD-ROM is read-only, so it cannot be erased or rewritten. “Written only once” describes a CD-R, which can be recorded once but is…

• A. Primary storage
• B. Internal memory
• C. Primary memory
• D. All of these

Explanation: Main memory is also called primary memory, primary storage, or internal memory because it is directly used by the processor during…

• A. Permanent, temporary
• B. Temporary, permanent
• C. Slow, fast
• D. Fast, slow

Explanation: In basic computer terminology, primary memory such as RAM is temporary because its contents normally disappear when power is removed…

• A. displaying output in a useful manner
• B. inputting data into a computer system
• C. providing relevant answers
• D. transforming input into output

Explanation: Processing is the stage in which a computer manipulates input data according to instructions and produces output.

• A. binary word
• B. parity bit
• C. binary codes
• D. character codes

Explanation: Computers encode instructions and memory addresses as binary codes because their electronic circuits operate using two states, represented…

• A. Floppy disk
• B. Hard drive
• C. Monitor
• D. Portable

Explanation: A floppy disk is a removable magnetic disk used to store information. A hard drive is also magnetic, but it is normally an installed…

• A. representational
• B. binary
• C. processing
• D. kilobyte

Explanation: At the machine level, computers process data using binary language, built from the digits 0 and 1.

• A. 256
• B. 512
• C. 128
• D. 64

Explanation: Each bit has two possible values, so a 7-bit code provides 2^7, or 128, distinct patterns.

• A. random error
• B. burst error
• C. inverted error
• D. none of these

Explanation: A burst error occurs when two or more bits in a data unit are altered, whether or not the changed bits are adjacent.

• A. 4 bits
• B. 8 bits
• C. 6 bits
• D. 16 bits

Explanation: A nibble is half of a byte, so it contains 4 bits. Two nibbles make one 8-bit byte.

• A. involve matching one data item to another to determine if the first item is greater than, equal to or less than the other item
• B. sort data items according to standard, predefined criteria in ascending order or decending order
• C. use conditions with operators such as AND, OR and NOT
• D. include addition, substraction, multiplication and division

Explanation: Arithmetic operations calculate numerical results using addition, subtraction, multiplication, and division.

• A. Data sharing errors
• B. Accessing data elements of the wrong type
• C. Attempting to use memory areas after freeing them
• D. All of the mentioned

Explanation: Data sharing errors, using a value with the wrong type, and accessing memory after it has been freed are all common pointer-related…