Question Discussion & Solution

The pattern followed here is as follows,

Hence code for words task is “gin lin”.

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.

CONCEPT:

• Semiconductor: The material which is not a good conductor or a good insulator is called a semiconductor.
  • For example: Silicon, Germanium, etc
• Intrinsic semiconductor: The pure form of semiconductor is called an intrinsic semiconductor.
• Extrinsic semiconductor: The impurity atoms added are called dopants and semiconductors doped with the impurity atoms are called extrinsic or doped semiconductors.

  • P-type semiconductor: The semiconductor having holes as majority charge carriers and electrons as a minority charge carrier is called as P-type semiconductor.

  • N-type semiconductor: The semiconductor having electrons as majority charge carriers and holes as a minority charge carrier is called as N-type semiconductor.

EXPLANATION:

• ​From the above discussion, we can say that electrons are the major charge carriers in n-type semiconductors.

• Elements of Group 5 have five valence electrons, i.e. 1 extra from the Group 4 elements.
• 4 out of 5 electrons get bonded with the neighboring Silicon atoms and 1 electron per atom remains extra with the Group 5 elements.

The computer has evolved from a large-sized simple calculating machine to a much smaller machine capable of multiple functionalities. Each generation of computer is designed based on the hardware technology used leading to better, cheaper and powerful computers that are faster and efficient than their predecessors.

Hence, it can be concluded from the table that vacuum tubes were used by the first generation computers.