Data | MCQs

Explanation

A database is a collection of logically related data sets or files that are organized for efficient storage, retrieval, and management.

It allows easy manipulation and querying of data through systems like SQL.

Explanation

Optical disks like CDs and DVDs store data in a spiral track that starts from the innermost part and moves outward.

This spiral path allows continuous reading of data as the disk spins.

Explanation

A floppy disk is a magnetic storage device, not an optical disk.

CD, DVD, and Blu-ray Disc are all optical storage media, read using laser technology.

Explanation

Magnetic memory (like hard drives and magnetic tapes) is read-write, not read-only — data can be both read and modified.

It is also non-volatile, reliable, and relatively cheap for storing large amounts of data.

Explanation

In z = z + y;, since z is an int and y is long, y is converted to int (if possible) to match the type of z due to usual type conversion rules.

The result is calculated as an int, and this may cause data loss if y exceeds int range.

Explanation

A record is complete information about a database.

The database is Consist of many different files linked with each other for the retrieval of information.

Explanation

Sector refers to a subdivision of a track on a circular storage medium.

Data is stored in a circular or pie-shaped section, often on a disk or hard drive.

Explanation

Explanation

MP4 (MPEG-4 Part 14) is a widely used container format for transmitting streaming videos online.

It supports various codecs, including H.264, which is known for its efficient compression and compatibility with most devices. 

Why other options are incorrect:

AVI (Audio Video Interleave):

While AVI is a common video format, it's not as optimized for streaming as MP4.

It can be larger and less efficient for online delivery. 

WMA (Windows Media Audio):

WMA is primarily an audio format, not designed for video streaming. 

WAV:

WAV is a pure audio format used for high-quality recordings.

It's not suitable for streaming video. 

Explanation

Encryption is the process of converting plaintext data into a coded, unreadable form to protect it from unauthorized access.

The primary purpose of encryption is to ensure the confidentiality and security of sensitive information.