Tag: science & technology

Quizzes (551) Questions (11015)

Questions Related to science & technology

Multiple choice general knowledge science & technology

The ----- is the white, opaque portion of the eye. It provides protection and serves as an attachment for the extraocular muscles which move the eye.

  1. Sclera

  2. Pupil

  3. Retina

  4. Cornea
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The sclera is the tough, white outer layer of the eye that forms the visible white part. It protects the inner structures and provides attachment points for the extraocular muscles that control eye movement.

Multiple choice general knowledge science & technology

The ----- is the innermost layer of the eye. It is composed of nerve tissue which senses the light entering the eye.

  1. Pupil

  2. Sclera

  3. Retina

  4. Cornea
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The retina is the light-sensitive innermost layer lining the back of the eye. It contains photoreceptor cells (rods and cones) that convert light into electrical signals sent to the brain via the optic nerve, enabling vision.

Multiple choice general knowledge science & technology

The ----- is a transparent dome which serves as the outer window of the eye. The cornea is the most powerful structure focusing light entering the eye.

  1. Pupil

  2. Cornea

  3. Sclera

  4. Retina
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The cornea is the clear, dome-shaped front surface of the eye. It serves as the eye's outermost lens and provides about two-thirds of the eye's focusing power, making it the primary structure for refracting incoming light.

Multiple choice general knowledge science & technology

Which is a major problem with SQL

  1. SQL cannot support object-orientation

  2. The same query can be written in many ways, each with vastly different execution plans

  3. SQL syntax is too difficult for non-computer professionals to use

  4. SQL creates excessive locks within the database
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A major problem with SQL is that the same query can be written in multiple syntactically correct ways, each producing vastly different execution plans and performance characteristics. This makes optimization challenging and query performance unpredictable. SQL does support some object-oriented features, the syntax is designed for professionals, and locking behavior is configurable.

Multiple choice general knowledge science & technology

Which of the following is an important feature of relational databases and SQL?

  1. Independence of table relationships

  2. High speed of SQL

  3. Powerful GUI front-end

  4. Easy to install and use
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A key feature of relational databases and SQL is the independence of table relationships through foreign keys and joins, allowing data to be distributed across multiple tables while maintaining logical connections. SQL execution speed varies, there is no standard GUI, and installation complexity depends on the specific DBMS.

Multiple choice general knowledge science & technology

What does the abbreviation DBMS stand for

  1. Database Management System.

  2. Data Borrowing and Movement Software.

  3. Database Manipulation Software.

  4. Digital Base Mapping System.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

DBMS stands for Database Management System, which is software that manages databases, allowing users to create, retrieve, update, and delete data in an organized and efficient manner. This is the standard industry term.

Multiple choice general knowledge science & technology

What is a 'tuple'?

  1. A row or record in a database table.

  2. An attribute attached to a record.

  3. Another name for the key linking different tables in a database.

  4. Another name for a table in an RDBMS.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In relational database terminology, a tuple refers to a single row or record in a table. It contains values for each attribute (column) defined in the table schema. This is the formal mathematical term from relational theory.