Question Discussion & Solution

The correct answer is 8.

• 8 UNESCO World Heritage Sites are located in Rajasthan.

Key Points

• UNESCO World Heritage Sites in Rajasthan
  • Amber Fort
  • The Walled City of Jaipur
  • Keoladeo National Park
  • Jaisalmer Fort
  • Gagron Fort
  • Ranthambore Fort
  • Kumbhalgarh Fort
  • Chittorgarh Fort
  • Jantar Mantar

Confusion Points

• There are total UNESCO World Heritage Sites in Rajasthan 9 but this is the previous year's question paper as Walled City of Jaipur added in 2019.

Additional Information 

• UNESCO World Heritage Sites in India 
  • ​There is a total of 40 world heritage sites out of which 32 are cultural, 7 are natural and 1 is mixed in India till now.
  • The last added World Heritage site in India was The Walled city of Jaipur.

Spam:

• the word spam is commonly used to describe unsolicited e-mails that are sent in bulk.
• It is the use of electronic messaging systems like emails and other digital delivery systems to send unwanted bulk messaged indiscriminately.
• Spamming means posting or emailing unsolicited advertising messages to a wide audience.
• It is used by companies to market their products, sometimes they are also used for dubious purposes to scam innocent people.

A virus

• It is a program that can infect other programs by modifying them to include a possibly evolved copy of itself.
• A computer Virus is nothing but a computer program that does unwanted things with your computer resources e.g. you are working on PC and you are repeatedly receiving the annoying message.
• A computer virus passes from computer to computer like a biological virus passes from person to person
• Common types of virus: File virus, Macro virus, Trojan Horse, Worm

Worm:

• A computer worm is a type of malware that spreads copies of itself from computer to computer.
• A worm can replicate itself without any human interaction, and it does not need to attach itself to a software program in order to cause damage.

Threat:

• A computer threat can be "intentional" such as hacking or "accidental" such as malfunctioning or physical damage.
• Security threat is defined as a risk which can potentially harm computer systems and organization.

Hence, it is clear that An unsolicited e-mail message sent to many recipients at once is called Spam.

Stack

• It is a Last In First Out (LIFO) data structure
• Piles is another name used for stack since data element are placed one above the other and last element on the pile is the first one to be removed (LIFO)

• Push-down list: A list in which the next item to be removed is the item most recently stored (LIFO); Stack is a LIFO data structure
• The stack is used in situations where data have to be stored and then retrieved in reverse order.
• Real-life implementation of the stack is shown:

The ball which is stored last (D) will be the first one to be taken out of the container

Important Points

• Stacks data structures are also called FILO (first in last out)
• push(), pop(), peek() are some of the functions of stack data structure

The correct answer is Distance.

Key Points

• An odometer is a device that is used for measuring the distance traveled by a vehicle.
• The odometer is usually situated in the vehicle's dashboard.
• The word "odometer" is derived from two Greek words meaning path and measure.
• Odometer is also used by people who construct roads and survey lands.

Additional Information

Given ten digit number is 6438123953

First half of the digits are : 64381

These are rearranged in descending order, so it becomes, 86431

Second half of the digits are : 23953

These are rearranged in ascending order, so it becomes, 23359

The new number is 8643123359

Comparing the new number with the given number

We see that, 4 digits position (highlighted) remains unchanged

Hence ‘4’ is the correct answer.