Question Discussion & Solution

The correct answer is Authentication.

Key Points

• MAC stands for message authentication code.
• A message authentication code is an authentication tag (also called a checksum) derived by application of an authentication scheme, together with a secret key, to a message.
• MACs can be categorized as - 
  • Unconditionally secure
  • Hash function-based
  • Stream cipher based
  • Block cipher based

The correct answer is A solid in gas.

Concept:

• A system made up of a substance distributed or scattered as minute particles of solid droplets of a liquid or extremely tiny bubbles of gas into the body of another substance is called a dispersion system.
• A dispersion system is a two-phase system.
• The distributed substance is called the dispersed phase and the continuous medium around it is called the dispersion medium.
• Depending upon the particle size of the dispersed phase, the dispersion system may be classified as 1. True solutions 2. Colloidal solutions 3. Suspensions.

Explanation:

Classification of colloids based on the type of phases:

• The colloidal system is heterogeneous in nature and consists of two phases called the dispersion medium and the dispersed phase.
• The component that is present in a small amount and behaves like a solute is called the dispersed phase and the component present in excess is called dispersion medium.
• Depending on the nature of dispersed phase and dispersion medium, colloids can be classified as:

• From the above table, it is clear that smoke contains solid particles suspended in the gaseous phase.
• Hence, smoke is a dispersion of solid in gas.

Important Points

• Gas in the gas phase is true solution. 

The correct answer is Trash

Key Points

• The Trash folder is where any emails have been deleted.
• This folder also indicates the mail which has been automatically deleted, are sent.
• The Trash folder will empty every time we log out of Message Center, and all of the messages will be permanently deleted.
• If we delete an e-mail from your inbox, it will initially be put into the Trash folder.
• The e-mail will only be permanently deleted if we delete it in the Trash folder or empty the trash, or if the e-mail's storage time has expired.
• Permanently deleted e-mail cannot be recovered.
• The default storage time for an email in the Trash folder is 1 day.
• We can customize the storage time for an email in the Trash folder.
• It is present at the left below the compose window in the email window.
• 

Additional Information 

Important Components of Compose Mail

SMTP: simple mail transfer protocol is used for sending e-mail services between the servers.

HTTP: Hypertext transfer protocol for distributed, collaborative, hypermedia information systems.

FTP: It is an application layer protocol for file transfer

'Loyalty', 'Allegiance', and 'Commitment' are synonyms.

Whereas, 'Infidelity' is an antonym of 'Loyalty'.

Hence, the correct answer is 'Infidelity'.