Explanation

Just as tall is the opposite of short, treachery is the opposite of loyalty.

Explanation

Ctrl + Shift + P is used to change the font size.

Explanation

Software is a set of computer programs and associated documentation and data.

This is in contrast to hardware, from which the system is built and which actually performs the work.

Explanation

Binary coded numbers are in the form of a series of 0s and 1s, also known as bits. 

A number represented in the base-2 numeral system.

It uses only the digits 0 and 1.

For example, (101)2 is a binary number.

Explanation

Every means each.

Every is a pronoun here.

We generally use singular verb with each and every.

Every worker was on duty means ہر کارکن ڈیوٹی پر تھا

Explanation

The list of coded instructions is called a Computer program.

Explanation

Natural graphite is used in many ways, from making pencils lead, to forming batteries.

The layered structure formed due to rings of carbon atoms present in Graphite makes it slippery and for that reason, it is used in Pencil leads.

Graphite was named by Abraham Gottlob Werner in 1789.

It is an allotrope of carbon.

Graphite is a good conductor of electricity.

Explanation

The Rio de Janeiro Earth Summit, took place in June 1992.

It is also known as the United Nations Conference on Environment and Development (UNCED).

It focused on addressing global environmental issues and sustainable development.

Explanation

Let A's current age be x and B's current age be y.

Since A is twice as old as B, x = 2y.

Three years ago, A's age was x - 3 and B's age was y - 3.

Since A was three times as old as B, x - 3 = 3(y - 3).

Solving the equations, we get x = 12.

So, the correct answer is 12 years.

Explanation

The pattern of the number series appears to be an increase of 5, 4, 9, 13, ... , which suggests an increase of 4, then 9, then 13, and so on.

Therefore, the next increase would be 15, which adds up to 57.

Here's the completed series:

4, 9, 13, 22, 35, 57