Explanation

Let's use the Pythagorean theorem:

Height of pole (perpendicular) = 12m

Length of string (hypotenuse) = 20m

Distance between foot of pole and end point of string (base) = √(hypotenuse² - perpendicular²)

= √(20² - 12²)

= √(400 - 144)

= √256

= 16m

Explanation

DEC VAX and IBM AS/400 are classic examples of minicomputers.

It is used widely in businesses and research during the 1970s–1990s.

They are mid-sized computers, more powerful than microcomputers but smaller than mainframes.

Explanation

Vaccination introduces weakened or inactive germs (antigens) into the body.

In response, the immune system produces antibodies to recognize and fight future infections.

Explanation

Noble gases like helium, neon, and argon are placed in Group VIII (Group 18 in modern IUPAC numbering).

They are inert.

They have a full outer electron shell.

It making them stable and unreactive.

Explanation

The Berlin Wall was built in 1961 by East Germany to stop mass defections to the West.

It became a symbol of the Cold War division between communist East and capitalist West.

Explanation

My father returned home at midnight.

"At" is used for specific times, like at midnight, at 5 PM.

Explanation

Adding the suffix "age" to "wreck" forms "wreckage," meaning the remains of something destroyed.

"Age" is a common suffix used to form nouns indicating a result or outcome.

Explanation

The Internet was developed to allow fast, global communication and sharing of information across networks.

It connects people, devices, and systems worldwide, transforming how we access and exchange data.

Explanation

Ctrl + N is universally used to create a new file/email in most programs (e.g., Outlook, Gmail, Word).

In Microsoft Outlook: Pressing Ctrl + N opens a new email window.

Explanation

Malleus, Incus, and Stapes are tiny bones in the middle ear.

They also known as the auditory ossicles.

They help transmit sound vibrations from the eardrum to the inner ear for hearing.