Questions

The coding or scrambling of data so that humans cannot read them is known as encryption.

Allotropes are the different physical forms of an element. Here in the given options, diamond and graphite are the pair of allotropes of carbon.

Some more examples are Molecular oxygen and ozone are pair of allotropes, Black and red phosphorous are also pairs of allotropes.

21 May 2013 is observed as Anti terrorism Day on the Death Anniversary of Rajiv Gandhi

Let the required number be 'X'

Condition 1 :  

$$\begin{gathered} XX = 2X \\ => 2X2 = X \\ => X = 12 \end{gathered}$$

Condition 2 :

$$\begin{gathered} X × X = X2 \\ => X = 12 \end{gathered}$$

Therefore, 12 is the number which becomes double when it is divided by itself and becomes half when it is multiplied by itself.

Africa is the second largest continent both by popolation and area wise. Asia being first by both popolation and area wise.

Second generation computers were developed during 1956 - 1963.