Explanation

• "An entity is anything about which we store data" is True.
• An entity is any real-world object or concept the database stores information about.
• Examples: customer, product, employee, order.

Explanation

++ adds 1 to a variable.

• a++ (post): uses the value, then increments.
• ++a (pre): increments, then uses value.
• -- decrements the same way.
• Alone in a statement, both forms behave identically.

Explanation

• A += B is equivalent to A = A + B.
• It's the compound assignment operator for addition.
• It takes the current value of A, adds B to it, and stores the result back into A.

Other compound operators follow the same pattern:

• A -= B → A = A - B
• A *= B → A = A * B
• A /= B → A = A / B
• A %= B → A = A % B

Explanation

• fclose() returns 0 on success and EOF (-1) on failure.
• It flushes any buffered data to the file before closing the stream
  For the standard input/output streams (stdin, stdout, stderr), 

Explanation

The cube of a number is the result of multiplying the number by itself three times.

Example:

5^3=5×5×5

Step-by-step:

• $5 times 5 = 25$
• $25 times 5 = 125$

Therefore,  5^3=125.

Explanation

A void function in C is used for its side effects rather than returning a value.

Common uses include:

• Printing to the screen (e.g., a function that prints a menu)
• Modifying global variables
• Updating values through pointers (e.g., a swap function)

Explanation

The output will be 5 (2 + 3 = 5).

Explanation

• Encryption is the security technique that converts plaintext into ciphertext to protect data from unauthorized access.
• Only users with the correct decryption key can read the original data.
• Encryption helps maintain data confidentiality during storage and transmission.
• It is widely used in online banking, emails, messaging apps, and e-commerce.
• Common encryption types are symmetric and asymmetric encryption.

Last verified on 01-08-2026

Explanation

• Wide Area Network (WAN) covers a large geographic area, such as a country or multiple countries.
• WAN connects multiple LANs and MANs through public or private communication links.
• The Internet is the world's largest example of a WAN.
• WAN is commonly used by governments, businesses, banks, and multinational organizations.
• It enables long-distance communication and data sharing.

Last verified on 01-08-2026

Explanation

• The primary function of an Operating System kernel is to manage hardware and system resources.
• It acts as a bridge between hardware and software applications.
• Kernel controls CPU, memory, and input/output devices.
• It ensures smooth execution of all programs.
• It is the core part of the operating system.

Last verified on 09-06-2026