Explanation

Palmtop computers are small handheld devices and usually do not have disk drives.

Laptops, notebooks, and desktops generally include disk drives for storage.

Explanation

• Display all columns = SELECT * FROM table_name;
• SELECT retrieves data from a table.
• * represents all columns.
• FROM specifies the table name.
• STUDENT is the table name.

Explanation

The address field contains letters, numbers, and symbols (e.g., "House #42, Street 8").

So, it must be stored as an alpha-numeric data type to handle such mixed content.

Explanation

#define PI 3.14

This is the correct syntax for defining a constant using the C preprocessor directive.

It replaces every instance of PI with 3.14 before compilation begins.

Explanation

BCNF is a stronger version of the 3rd Normal Form; it handles certain anomalies that 3NF does not.

It ensures that every determinant is a candidate key, improving data integrity.

Explanation

In Consolidated Data Distribution, all data is stored at one central site.

This simplifies management but may reduce access speed for remote users.

Explanation

An index helps the database quickly locate rows in a table without scanning the entire data.

It improves query performance by providing direct pointers to the data rows.

Explanation

UNIX is a multitasking operating system that supports multiple users and command-line interface (command drivers).

It is widely used in servers and academic environments due to its robustness and flexibility.

Explanation

Supercomputers are the most powerful computers, capable of performing trillions of calculations per second.

They are used in research laboratories for complex tasks like climate modeling, simulations, and scientific research.

Explanation

Scratch is a visual programming language where users create programs by dragging and connecting code blocks.

It is mainly used for educational purposes to teach programming concepts in a simple, interactive way.