A duty or task that needs to be fulfilled is a responsibility that needs to happen.

For example : a doctor has his own task or responsibility, a police, a lawyer, etc... all have their own responsibilities.  

Ionisation energy is the energy required to remove one mole of electrons from one mole of gaseous atoms. Atoms are more stable when they have full valence shells.

The ionization energy decreases from top to bottom in groups, and increases from left to right across a period.

HGence, in this trend Francium (Fr) has the lowest ionization energy.

Yes, Every integer is a rational number.  A rational number is a number which can be expressed as a ratio of two integers numerator and denominator where (the denominator not being 0 ).

Hence, Every integer can be expressed in ratio of two integers. 

A storage device refers to a computing hardware used to store information permanently or temporarily. The device can be external or internal to a computer, server, and other computing systems.

There are two types of storage devices used with computers: a primary storage device, such as RAM, and a secondary storage device, like a hard drive. Secondary storage can be removable, internal, or external.

Here printer is not the storage device, it is an outut.

After all possiblle rearrangements, the only word with a meaning is ARCTIC fro the given given letters.

The first electric train of India was opened in 1925. The first electric train ran between Bombay (Victoria Terminus) and Kurla, a distance of 16 km.

Silico Sapiens generally refers to robots.

In a database table, the category of information is called Field.