Question Discussion & Solution

CONCEPT:

Metals Have Luster:

• Metals, in their pure state, have a shining surface. This property is called metallic luster.
• All the metals have a luster and shiny property except Lead.
• If we polish metals most of them having a reflecting surface i.e. Gold, Silver, etc.

EXPLANATION:

• When light shines on a lustrous metal, the loosely bound electrons reflect incoming light, giving the metal a shiny appearance. Therefore option 3 is correct.

1) Lalit scored 72 marks in 100-mark test.

Shubham scored 8 marks more than Lalit but 6 marks less than Sunil.

Thus, Shubham’s marks = 72 + 8 = 80

Sunil’s marks = 80 + 6 = 86

Therefore, Lalit < Shubham < Sunil.

2) Ravi scored 6 marks less than Daniel, and 7 marks more than Sunil.

Ravi’s marks = Sunil’s marks + 7

Daniel’s marks = Ravi’s marks + 6

Thus, Sunil < Ravi < Daniel.

Now, we have the following order:

Lalit < Shubham < Sunil < Ravi < Daniel

Second lowest = second in ascending order.

The correct answer is Memory.

Key Points

• The memory mapping process is handled by the virtual memory manager, which is the same subsystem responsible for dealing with the page file.
• Memory-mapped files are loaded into memory one entire page at a time.
• The page size is selected by the operating system for maximum performance. 

Additional Information

• A memory
  • It is just like a human brain.
  • It is used to store data and instructions. 
  • Computer memory is the storage space in the computer, where data is to be processed and instructions required for processing are stored.
  • The memory is divided into a large number of small parts called cells.
• Process
  • It is the instance of a computer program that is being executed by one or many threads.
  • It contains the program code and its activity.
  • Depending on the operating system, a process may be made up of multiple threads of execution that execute instructions concurrently.
• A computer file
  • It is a computer resource for recording data in a computer storage device.
  • Just as words can be written to paper, so can data be written to a computer file.
  • Files can be edited and transferred through the Internet on that particular computer system.
• Computer security
  • cybersecurity or information technology security is the protection of computer systems and networks from information disclosure, theft of or damage to their hardware, software, or electronic data, as well as from the disruption or misdirection of the services they provide.

Valency is the combining power of an element. Elements in the same group of the periodic table have the same valency.

Key Points

• Valency is the no of electron that looses, shared or gain to achieve stability or we can say to complete it outer most shell. 
• If any element has valence electron (electrons present in outer most shell) less than 4
  • ​​Valency = no of valance electron (valence electron<4)
• If any element has valence electron ​more than 4
  • ​​Valency = 8 - no of valance electron (valence electron>4)

​For Lithium:

• Li(Z=3) Electronic configuration = 2, 1
  • Valency = no of valance electron  = 1

​Hence, we can conclude that 1 is the valency of Lithium.

The correct answer is Folk Dance.

Key Points

• Dancer Kalbelia Gulabo Sapera's tale is one of perseverance in the face of societal pressure.
• Gulabo was awarded the Padma Shri in 2016 for his efforts to popularise Rajasthan's Sapera dance tradition, which he has promoted in over 165 countries.
• She was a participant in the recently concluded Jaipur Literature Festival 2021, a woman whose storey is worth hearing.
• Gulabo's indomitable spirit protected her from a destiny that regularly befalls girl children in the nomadic group of kalbelias, an abjectly poor population on the outskirts of civilization.

Important Points

• Kalbelia is a snake-charming tribe from Rajasthan, India's the Thar Desert.
• Men and women both do dance, which is an important element of their culture.
• The Daliwal and Mewara are the two main groups of Kalbelias. In ancient times, the Kalbelias were known to wander about a lot.
• Catching snakes and trading snake venom is their traditional occupation.