Question Discussion & Solution

The correct answer is Gold.

• Gold is not found in the Chota Nagpur Plateau.

Key Points

• Chhota Nagpur Plateau:
  • Chotanagpur plateau represents the north-eastern projection of the Indian Peninsula.
  • Chhota Nagpur plateau has an abundance of mineral resources such as mica, bauxite, copper, limestone, iron ore and coal.

Additional Information

• Gold in India is found in Karnataka and Uttar Pradesh. 

The chemical substance present in bones and teeth is Calcium Phosphate or Ca₃(PO₄)₂.

• Calcium phosphate is fundamental to the formation of bone and teeth.
• It is essential for achieving optimal peak bone mass in the first 2–3 decades of life and for the maintenance of bone in later life.
• Bones:-
  • Bones are mostly made of collagen, a type of protein.
  • Calcium phosphate, a mineral, is the other main component of the bones.
  • Collagen gives the bones a soft framework, while calcium phosphate is what makes them hard and strong.
  • Bones are made of living tissues, so old bone tissue is broken down and removed, and then new tissue is created to replace the old.
• Teeth:-
  • Enamel – the hard, outer layer of your teeth – is made of minerals like calcium phosphate.
  • Enamel is harder than the bones. It's the hardest substance in the whole body.
  • However, unlike the bones, the teeth enamel doesn't contain any living tissues and so can't heal on its own.

A storage unit is used to store information and instructions when they are not being used in memory.

Three kinds of storage devices are a flash drive, hard disks, and CD - ROM drives.

Data access time is the time taken by a computer, or a data storage device or medium, to respond to a user's request for data.

Typical access times for a CD-ROM drive, 200 milliseconds; hard drive, 15 milliseconds; Random Access Memory (RAM), 70 nanoseconds.

There is a trade-off among the three key characteristics of memory: namely, capacity, access time, and cost. A variety of technologies are used to implement memory systems, and across this spectrum of technologies, the following relationships hold:

• Faster access time, greater cost per bit
• Greater capacity, smaller cost per bit
• Greater capacity, slower access time

The correct answer is Select, where, group by, having.

Additional Information

Six Operations to Order: SELECT, FROM, WHERE, GROUP BY, HAVING, and ORDER BY. Because the database executes query components in a specific order,

SELECT select_list [ INTO new_table ]  [ FROM table_source ]

[ WHERE search_condition ]

[ GROUP BY group_by_expression ]

[ HAVING search_condition ]

[ ORDER BY order_expression [ ASC | DESC ] ]

Hence Option 4 is correct

The correct answer is ​0 to 14.

Important Points

• The pH scale is the scale used to express the acidity or alkalinity of a substance based on the concentration of hydrogen ions in its solution.
  • pH scale was discovered by Soren Sorensen.
  • The range of pH scale 0 to 14.
    • If pH < 7 then solution is acidic.
    • If pH > 7 then solution is basic.
    • If pH = 7 then solution is neutral.

Additional Information

• pH means the potential of Hydrogen.
• The strength of acids and bases depends on the number of H⁺ ions and OH^- ions produced, respectively.
• The human body works within the pH range of 7.0 to 7.8.
• When the pH of rainwater is less than 5.6, it is called acid rain.
• Tooth decay starts when the pH of the mouth is lower than 5.5.