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The correct answer is option 2.

Key Points

• Bihar is bordered by three states and one country.
• The boundaries of Bihar are shared with Uttar Pradesh to the west, Nepal to the north, West Bengal to the east, and Jharkhand to the south.
• Jharkhand and Uttar Pradesh share their boundaries with the maximum number of districts of Bihar (8 districts).
• West Bengal shares its boundary with 3 districts of Bihar.
• Nepal shares its boundary with 7 districts of Bihar.
• Uttar Pradesh:- West Champaran, Gopalganj, Siwan, Saran, Buxar, Bhojpur, Rohtas, and Kaimur
• Jharkhand:- Katihar, Bhagalpur, Banka, Jamui, Nawada, Gaya, Aurangabad and Rohtas
• West Bengal:-  Kishanganj, Prunea and Katihar
• Nepal:-  West Champaran, East Champaran, Sitamarhi, Madhubani, Supaul, Araria and Kishanganj
• Both Uttar Pradesh and Jharkhand state have a common
• border with 8 districts of Bihar. We have verified this with maps of these three states where we find that the eastern tip of Katihar district touches Jharkhand and the Western tip of Rohtas district touches Uttar Pradesh.

The correct answer is option 3.

Key Points

• The last station in Bihar on the train route from Bhagalpur to Mirza Cheuki is Ammapali Railway Station.
• Station starting from Bhagalpur toward Mirza Cheuki :
• Bhagalpur (BGP) > Sabaur (SBO) > Lailakh Mamlkha (LMM) > Ghoga (GGA) > Ekchari (EKC) > Kahalgaon (CLG) > Bikramshila (BKSL) > Shivanarayanpur (SVRP) > Ling Kotturu (LKB) > Pirpainti (PPT) > Ammapalli Halt (AMPL) > Mirza Cheuki (MZC)

Ammapali Railway Station

• ​On the Sahibganj loop line, in the Malda railway division of the Eastern Railway zone, is the halt station known as Ammapali. It is located in the Indian state of Bihar's Bhagalpur district near Pakaria, Ammapali.

Mirza Cheuki railway station

• ​The Mirza Cheuki railway station is situated on the Sahibganj loop route in the Eastern Railway zone's Malda railway division. It is located in the Indian state of Jharkhand in Mirza Cheuki in the Sahebganj district.

The correct answer is 2 only.

Key Points

1. Rohtas has the highest deposit of pyrites.

• Bihar controls 95% of the nation's pyrite resources and is its primary owner.
• It is an iron compound that is mostly used to produce sulfuric acid.
• Sulphuric acid is used in industries like fertiliser, petroleum, steel, etc.
• Primarily found in Rohtas district's Vidhyan belt and Sone valley. Hence statement 1 is incorrect.

2. Limestone is found in Kaimur(Bhabhua), Munger(Monghyr) and Rohtas districts.

• In the districts of Kaimur (Bhabhua), Munger (Monghyr), and Rohtas, limestone can be found. Hence statement 2 is correct.
• Calcium carbonate is the main component of Limestone.
• The cement business uses high-quality limestone, but the iron and building construction industries utilise low-quality limestone.

3. Gold deposits are found in the Jamui district.

• A report by the Indian Bureau of Mines states that the Jamui district possesses around 222.88 million tonnes of gold reserves, including 37.6 tonnes of ore rich in minerals. Hence statement 3 is incorrect.
• Therefore option 2 is correct.

The correct answer is option 1.

Key Points

Phalgu, a sacred river

• Three kilometres below Bodh Gaya, the Lilajan (also known as Niranjan or Nilanjan) and the Mohana, two sizable highland streams with a combined width of more than 270 metres, come together to form the Phalgu.
• The Phalgu is also referred to as Niranjan.
• After passing through the town of Gaya, the unified stream continues to flow north, expanding to a width of more than 820 metres.
• The Phalgu River in Bihar spans over 135 kilometres.
• For Buddhists and Hindus, the river is sacred.
• On the banks of the Phalgu river is a very well-known temple named Vishnupad Mandir.
• The mouth of the Phalgu River is the Punpun river.
• The Hindu epic known as the Ramayana makes mention of the city of Gaya and the Phalgu River.
• Based on an occurrence, it has been claimed that Sita (Lord Rama's wife) once cursed the Phalgu River. The Phalgu is thought to have changed into a long stretch of sand dunes as a result of this curse.

The correct answer is Thakurganj.

Key Points

Tea gardens in Bihar

• In Bihar, tea gardens were established for the first time in Thakurganj.
• The state's tea business has flourished in the Thakurganj area of northeastern Bihar, which is less than 200 kilometers from Darjeeling and possesses soil and a climate that are more similar to Assam.
• Doke Tea Estate is the tea garden that popularised Bihar around the nation.
• Doke, which takes its name from the river that runs through it, was founded in 1998 by tea industry veteran Rajiv Lochan of Siliguri.
• It is a modest estate with 35 acres cultivated with tea. Initially, the plantation produced leaves that were supplied to adjacent tea factories.
• In the Kishanganj district of the Indian state of Bihar, Thakurganj is a town and notified area that is divided into 12 wards.

The correct answer is option 2.

Key Points

• According to the census 2011,
• The Decadal growth rate of the population in Madhepura is 30.65%.
• The Decadal growth rate of the population in Kishanganj is 30.44%.
• The Decadal growth rate of the population in Siwan is 22.25%.
• So the correct answer is Siwan < Kishanganj < Madhepura.
• The decadal census report shows that Bihar's population growth rate has decreased by 3.45%.
• In Bihar, the population growth rate was 25.07% between 2001 and 2011, compared to 28.63% between 2001 and 1991.
• In 2011, Gopalganj had the greatest sex ratio among the districts, with 1015 females to every 1000 males, while Bhagalpur and Munger recorded the lowest, with 879 females to every 1000 males.

Districtwise Decadal growth rate of the population in Bihar:

The correct answer is the Cereal-based industry.

Key PointsAgro-based industries in Bihar

• Agro-based industry includes- Food Products, Beverages and Tobacco products, Textiles, leather products, wood, furniture, and paper industry.
• The major agricultural products of Bihar are cereals, pulses, oilseeds, and cash crops.
• The productivity of cereals in Bihar is lower than the national average while it is higher in the case of pulses and maize and more or less at par with the national average in the case of oilseeds.

The correct answer is Kabul River.

Key Points

• The Kabul River empties into the Indus River near Attock, Pakistan.
• It is the main river in eastern Afghanistan and the Khyber Pakhtunkhwa province of Pakistan.

Kabul River

• The Kabul River, which measures 700 kilometers or 430 miles long, passes through the cities of Kabul and Jalalabad in Afghanistan.
• Its large drainage basin covers the eastern provinces of Nangarhār, Kunar, Laḡmān, Lōgar, Kabul, Kāpisā, Parvān, Panjšēr, and Bāmiān before it flows into Khyber Pakhtunkhwa in Pakistan some 25 kilometers (16 mi) north of the Durand Line border crossing at Torkham.
• A majority of the Kabul River’s water originates from the snow and glaciers of the Chitral District, out of which it flows into Afghanistan. In its upper reaches, it is known as the Sarchashma.
• The major tributaries of the Kabul River are the Logar, Panjshir, Alingar, Surkhab, Kunar, Bara, and Swat rivers

The correct answer is Project Tiger.

Key Points

Project Tiger

• Project Tiger was launched in India in 1973.
• Project Tiger is a tiger conservation program launched in April 1973 during PM Indira Gandhi’s tenure.
• In 1970 India had only 1800 tigers and Project Tiger was launched in Jim Corbett National Park.
• The project is administrated by the National Tiger Conservation Authority (NTCA).
• It aims at ensuring a viable population of Bengal tigers in their natural habitats, protecting them from extinction, etc.
• Under this project the govt. has set up a Tiger Protection Force to combat poachers and funded the relocation of villagers to minimize human-tiger conflicts.

The correct answer is ​Its average height is 13 km.

Key PointsTroposphere

• The average height of the troposphere is 13 km. The troposphere is the lowest layer of the Earth's atmosphere, containing around 80% of its mass and 99 % of its water vapour and aerosols.
• The Troposphere's density is one of its distinguishing characteristics.
• In addition to nitrogen and oxygen, the troposphere contains carbon dioxide, water vapour (almost all of the water vapour in the atmosphere is concentrated in the troposphere), and a variety of other particles.
• The troposphere is where the majority of our weather occurs: clouds, rain, and snow.
• The troposphere is home to nearly all of the air in the atmosphere, as well as nearly all of the water vapour (which forms clouds and rain).
• Its thickness, which tends to vary seasonally, is least at the poles and greatest at the equator.
• The water vapour and particulates of the atmosphere are concentrated in this one layer; they are rarely found in the atmosphere above the troposphere.

Tropospheres Thickness

• The thickness of the troposphere varies across different latitudes of the earth.
• It is thickest in the equator, up to 20 km deep in the tropics, and shallower near the poles, at 7 km.

Additional Information

• The stratosphere lies above the troposphere. It extends up to a height of 50 km.
• The mesosphere lies between the stratosphere and the thermosphere. It extends up to a height of 80 km.
• The thermosphere lies between 80-400 km. The exosphere is the uppermost layer of the atmosphere.