Question Discussion & Solution

Concept:

• Any battery (actually it may have one or more than one cell connected in series) or cell that we use as a source of electrical energy is a galvanic cell where the chemical energy of the redox reaction is converted into electrical energy. 
• In the primary batteries, the reaction occurs only once, and after use over some time battery becomes dead and cannot be reused again.
• The most familiar example of this type is the dry cell (known as Leclanche cell after its discoverer) which is used commonly in our transistors and clocks. 
• The cell consists of a zinc container that also acts as anode and the cathode is a carbon (graphite) rod surrounded by powdered manganese dioxide and carbon.
• The space between the electrodes is filled by a moist paste of ammonium chloride (NH4Cl) and zinc chloride (ZnCl2). 

Explanation:

• The cell consists of a zinc container that acts as the anode.
• The cathode is a carbon (graphite) rod surrounded by a cathodic material powder of manganese dioxide and carbon.

So, The positive pole of the dry cell is made up of C (carbon).

The correct answer is Uttar Pradesh.

• According to the 2011 census, Uttar Pradesh has the highest population growth rate.

Key Points

• A census is a procedure of systematically acquiring and recording information about the members of a given population. 
• This term is used mostly in connection with national population and housing census.
• The decennial Census of India has been conducted 15 times, as of 2011.
• First synchronised census in India took place in 1881.
• Since 1901, it has been taking place every decade.

Additional Information

• The 15th Indian Census was conducted in two phases, house listing and population enumeration.
• As per the home ministry notification dated March 28, 2019, declaring the government's intent to conduct Census 2021, the house listing phase was to take place from April 1 to September 30, 2020.
• Population enumeration was to be done from February 9 to 28, 2021.

The correct answer is Vitamin A.

Key Points 

• Night blindness is the inability to see well at night or in poor lighting conditions. 
• Night blindness is also called nyctalopia.
• Night blindness is often caused by Vitamin A deficiency.
• Night blindness is also caused by nearsightedness or cataracts.
• Foods that provide Vitamin A are carrots, sweet potatoes, eggs, milk, milk products, etc. 

Additional Information 

The correct answer is Shifting.

• Jhoom agriculture is also known as Shifting.

Key Points

• Shifting Agriculture:
  • It is practised by the tribals in the forest areas of Assam, Meghalaya, Nagaland, Manipur, Tripura, Mizoram, Arunachal Pradesh, Odisha, Madhya Pradesh, Jharkhand and Andhra Pradesh.
  • In this type of agriculture, a piece of forest land is cleared mainly by tribal people by felling and burning of trees and crops are grown.
• Jhoom is the name of Shifting Agriculture in the north-east region of India.
• Podu, Dabi, Koman or Bringa in Orissa
• Kumari in the Western Ghats.
• Watra in southeast Rajasthan,
• Penda, Bewar or Dahia and Deppa or Kumari in the Bastar district of Madhya Pradesh.

Additional Information

• Names of shifting agriculture around the world:

Rajendra Prasad is the first president of India. Similarly, the first president of USA is George Washington.

Hence, George Washington is the correct answer.