7 fundamental physical quantities are :
time, length, mass, electric current, thermodynamic temperature, amount of substance, and luminous intensity

Examples of longitudinal waves include: sound waves. ultrasound waves. seismic P-waves.

When white light is passed through a glass prism it splits into its spectrum of colours (in order violet, indigo, blue, green, yellow, orange and red) and this process of white light splitting into its constituent colours is termed as dispersion.

Celsius and Fahrenheit scale coincide at -40 degrees.

The power of a lens is defined as the reciprocal of the focal length. Lens power is measured in dioptres (D).

– Magnetic resonance imaging (MRI) is a non-invasive imaging technology that offers three dimensional accurate and detailed anatomical images that help doctors to diagnose and cure health issues.

– Unlike computed tomography CT scan and X-rays scan, Magnetic resonance imaging (MRI) does not use the dangerous ionizing radiation of X-rays. But it does use a powerful magnetic field.

When a particle moves from one medium to other its amplitude increases on decreases. The velocity depends on the nature of medium, so velocity changes. Since velocity changes, wavelength also changes. But the frequency, which is the number of cycles per second remains same.

A light-year is a unit of distance. It is the distance a light photon travels in the vacuum in one Julian year. The value of the one-light year is constant.

Atoms, the fundamental building blocks of all molecules, consist of three types of particles: protons, neutrons, and electrons. Of these three subatomic particle types, two (protons and electrons) carry a net electric charge, while neutrons are neutral and have no net charge.

The SI unit of electrical resistivity is the ohm-meter (Ω⋅m).

Sapphire is a variety of corundum or aluminum oxide and Al2O3 gives its chemical formula — that is, two parts of Aluminum to three parts of Oxygen.

Ignition quality of petrol is expressed by octane number and that of diesel by cetane number.

Melting point of:
Boron – 2076 °C
Iron – 1538 °C
Silicon – 1414 °C
Aluminum – 660.3 °C

The main types of antibiotics include: Penicillin – for example, phenoxymethylpenicillin, flucloxacillin and amoxicillin.

The main component in CNG is methane (CH4) stored at high temperature.

Acid rain results when sulfur dioxide (SO2) and nitrogen oxides (NOX) are emitted into the atmosphere and transported by wind and air currents. The SO2 and NOX react with water, oxygen and other chemicals to form sulfuric and nitric acids. These then mix with water and other materials before falling to the ground.

Exhausts from cars cause the formation of nitrogen oxides in the air. From these gases, airborne sulfuric acid (H2SO4) and nitric acid (HNO3) can be formed and be dissolved in the water vapor in the air.

Heavy water (D2O), also called deuterium oxide, water composed of deuterium, the hydrogen isotope with a mass double that of ordinary hydrogen, and oxygen.

In its purest form, water has a pH of 7, which is at the exact center of the pH scale.

The Nobel Prize in Chemistry 2019 was awarded jointly to John B. Goodenough, M. Stanley Whittingham and Akira Yoshino “for the development of lithium-ion batteries.

Natural rubber is a polymer of isoprene. Natural rubber is also known as latex, Caucho, Indian rubber, caoutchouc, and Amazonian rubber.

District of Bihar with lowest female Literacy Rate in 2011 : Saharsa – 41.7%

District of Bihar with lowest female Literacy Rate in 2001 : Kishanganj

Based on the 15th FC’s recommendations for the period 2021-26,
▪ Share of Bihar in the divisible pool of central taxes. (Share out of 41%): 4.12%
▪ Share of Bihar in the divisible pool of Central Taxes (Out of 100): 10.058%

According to the new series of data on Gross State Domestic Product (GSDP), the growth rate of Bihar’s economy in 2018-19 was 10.53 percent (at constant prices) and 15.01 percent (at current prices), which is higher than the growth rate for the Indian economy.

[SOURCE : ECONOMIC SURVEY OF BIHAR 2019-20]

The contribution of agricultural and allied sectors to the Bihar’s GSVA was 21 percent in 2017-18 and the share of crop sector in the GSVA was 12.1 percent.

[SOURCE: Economic Survey of Bihar 2019-20]

The power capacity availability in the state was 3889 MW in 2018, and increased to 4767 MW in 2019.

[SOURCE: Economic Survey of Bihar 2019-20]

The Government of India has conferred the Krishi Karman Award to the state on 2nd January 2020, for its achievements in production and productivity of Maize and Wheat.

बिहार को 2016-17 में मक्का और 2017-18 में गेहूं में श्रेष्ठ उत्पादन के लिए यह पुरस्कार दिया गया है।

Kunwar Singh entered Jagdishpur on 22 April, 1858.

Champaran movement was a farmer’s uprising that took place in Champaran district of Bihar in the Indian subcontinent, during the British colonial period. The farmers were protesting against having to grow indigo (Cash Crop) with barely any payment for it.

In 1904 “The Golden League” was established at Deoghar with the objective of boycotting British and advancing the Swadeshi Movement in Bihar. In Bhagalpur the agitation started in 1906 where Surendra Nath Banerjee with other supporters visited and delivered lectures on Swadeshism , majority of supporters were students of colleges who formed processions and filled the streets in red and yellow clothes and wearing Vande Mataram badges.

However, it was during the Quit India Movement of August 1942 that more sterling qualities of Jayaprakash Narayan came to the fore. He along with Ram Manohar Lohia and Aruna Asaf Ali, took charge of the ongoing stir when all the senior leaders had been arrested. However, he also could not remain outside the jail for long time and was soon arrested under Defence of India Rules, a preventive detention law that did not require trial. He was put in Hazari Bagh Central Jail. JP along with his accomplices started making plan to escape from the Jail. Their chance came soon on a Diwali day in November 1942 when a large number of guards were on leave because of the festival. It was a daring escape which made JP into a folk hero.

JP actively worked underground for Indian Freedom Movement in this period. For fighting the tyranny of British rule, he organised an “Azaad Dasta” (freedom brigade) in Nepal. After some months, he was arrested from Punjab while travelling in a train in September 1943. He was tortured by British authorities for getting necessary information about freedom movement. In January 1945, he was transferred from Lahore Fort to Agra Jail. When Gandhi insisted that he would begin negotiation with British rulers only after unconditional release of Lohia and Jayaprakash, They were released in April 1946.

The Bihar Herald was started in 1872 by Babu Guru Prasad Sen.

India and Nepal in 2019 opened South Asia’s first cross-border oil product pipeline, helping Kathmandu to cut fuel prices by Rs 2 per litre on account of reduced transportation cost.

Prime Minister Narendra Modi and his Nepalese counterpart K P Sharma Oli jointly inaugurated through video-conference the 69km pipeline from state-run Indian Oil’s terminal in Motihari in north Bihar to Nepal Oil Corporation’s Amlekhgunj depot in Narayani zone of southern Nepal.

On January 21, 2020, Indian Prime Minister Narendra Modi and Nepalese PM Oli inaugurated an integrated check post (ICP) at Jogbani-Biratnagar. This is the second check post that is being built at the border with Indian Assistance.

The first integrated check post of the countries was built at Raxaul-Birgunj in 2018.

In November 2020, the Ministry of Environment, Forest and Climate Change (MoEFCC) declared it the first Ramsar site in Bihar. Kanwar jheel, as it is locally called, is located 22 km north-west of Begusarai Town in Manjhaul.

The Rajgir Hills, also known as “Rajgriha” hills, lie near the city of Rajgir in central regions of the Indian state of Bihar. It is surrounded by five hills named Ratnagiri, Vipulachal, Vaibhavagiri, Songiri and Udaygiri. It is an important Buddhist, Hindu and Jain pilgrimage site.

The 16th session of the Bihar Students Conference was held at Hazaribag in 1921.

3 districts of Bihar had less than 10 lakhs population in 2011: Arwal, Sheohar, Sheikhpura