Explanation

Oxygen is the chemical element with the symbol O and atomic number 8.

Oxygen Discoverers: Joseph Priestley, Antoine Lavoisier, Carl Wilhelm Scheele

Oxygen Symbol: O

Oxygen Atomic number: 8

Oxygen Electrons per shell: 2, 6

Explanation

Evaporation is the process where liquid turns into gas at temperatures below its boiling point.

It occurs at the surface of the liquid.

It is influenced by factors like temperature and surface area.

Explanation

Semi was 21 years old in 1945

The number of years from 1945 to 1965 is 20 years.

21 + 20 = 41

Explanation

We know that in a dictionary, words are arranged in alphabetical order.

First, we will arrange the letters of the word MOTHER in alphabetical order

Thus, we get E, H, O, M, R, and T.

Now, we know that the words starting with E will appear first in the dictionary.

Let us fix letter E as the first letter of the word.

Explanation

• MS Word is a widely used word processor developed by Microsoft.
• It was first released on October 25, 1983.
• MS Word is an example of application software.
• It allows users to type and save documents.
• It is helpful too for making documents.

Explanation

A farad (F) is the standard unit of capacitance (C) in the International System of Units (SI).

***

The SI unit of energy/work is the joule (J)

Explanation

Gamma rays have the shortest wavelength and highest energy in the electromagnetic spectrum.

They are produced in nuclear reactions.

They are used in medical treatments and scientific research.

Explanation

Air is a homogeneous mixture of the gaseous substances

nitrogen,

oxygen, 

smaller amounts of other substances.

Explanation

Ctrl+D key is used to open the Font dialog box with the focus on the Font combo box.

Ctrl+F12 opens a document in the Word. 

Ctrl+D key is used to open the Font dialog box.

Ctrl + H is used to open the Replace dialog Box. 

Explanation

Ayesha Farooq is the first lady fighter pilot of Pakistan.

She achieved this milestone in 2013.

She becoming a symbol of women's empowerment in the Pakistan Air Force.