Bihar Board Class 10 · Social Science · Matric exam 2027
Bihar Board Class 10 Social Science Question Paper 2025
The board’s 2025 question paper, set B — all 112 questions as printed; 79 objective answers from the board’s own key; full model answers for 3 written questions, how the answer begins for 29 more. Each question names its chapter, where that chapter’s most-asked questions are.
Full marks 80 · Time 2 h 45 min
Section A · Objective questions (80)
National income in India is calculated by which of the following ?
- (A) Central statistical office ✓
- (B) Planning Commission
- (C) NITI Aayog
- (D) National Development Council
Answer (the board’s key): (A)
Who changed the name of Bolshevik Party to Communist Party ?
- (A) Lenin ✓
- (B) Trotsky
- (C) Stalin
- (D) Bismarck
Answer (the board’s key): (A)
When was the partition of Bengal cancelled ?
- (A) 1904
- (B) 1905
- (C) 1907
- (D) 1911 ✓
Answer (the board’s key): (D)
Which of the following was founded by Lala Hardayal ?
- (A) Home Rule League
- (B) Ghadar Party ✓
- (C) Communist Party of India
- (D) Brahmo Samaj
Answer (the board’s key): (B)
What is the another name for Government of India Act, 1919 ?
- (A) Montague-Chelmsford Reforms ✓
- (B) Ilbert Bill
- (C) Indian Statutory Commission
- (D) Nehru Report
Answer (the board’s key): (A)
Who founded the All India Muslim League ?
- (A) Mohammad Ali Jinnah
- (B) Zakir Hussain
- (C) Nawab Salimullah Khan ✓
- (D) Muhammad Ismail
Answer (the board’s key): (C)
The government of Bao Dai in South Vietnam was a supporter of which of the following ?
- (A) China
- (B) Spain
- (C) France ✓
- (D) Portugal
Answer (the board’s key): (C)
Who abolished Serfdom in Russia ?
- (A) Lenin
- (B) Czar Alexander II ✓
- (C) Stalin
- (D) Trotsky
Answer (the board’s key): (B)
Where was the first hydropower plant established in India ?
- (A) Gangtok
- (B) Darjeeling ✓
- (C) Dibrugarh
- (D) Calcutta
Answer (the board’s key): (B)
Kutch region of Gujarat falls in which seismic zone ?
- (A) Zone-II
- (B) Zone-III
- (C) Zone-IV
- (D) Zone-V ✓
Answer (the board’s key): (D)
Which river is called the 'Sorrow of Bengal' ?
- (A) Ganga
- (B) Damodar ✓
- (C) Kosi
- (D) Brahmaputra
Answer (the board’s key): (B)
Which is the largest artificial lake in India ?
- (A) Govind Sagar
- (B) Pant Sagar ✓
- (C) Sardar Sarovar
- (D) Krishna Sagar
Answer (the board’s key): (B)
Aswan dam is built on which river ?
- (A) Nile River ✓
- (B) Brahmaputra River
- (C) Amazon River
- (D) Ganga River
Answer (the board’s key): (A)
What was India's position in the world in terms of population in 2011 ?
- (A) First
- (B) Second ✓
- (C) Third
- (D) Fourth
Answer (the board’s key): (B)
By which strait is India separated from Sri Lanka ?
- (A) Palk Strait ✓
- (B) Malacca Strait
- (C) Bering strait
- (D) Hormuz strait
Answer (the board’s key): (A)
What is the old alluvial soil of Ganga plain called ?
- (A) Khadar
- (B) Bhangar ✓
- (C) Regur
- (D) None of these
Answer (the board’s key): (B)
Who among the following was the German Chancellor ?
- (A) Mazzini
- (B) Hegel
- (C) Bismarck ✓
- (D) Victor Emmanuel
Answer (the board’s key): (C)
When did the Naples Revolution happen ?
- (A) 1789
- (B) 1821 ✓
- (C) 1839
- (D) 1917
Answer (the board’s key): (B)
Who is considered the father of scientific socialism ?
- (A) Hegel
- (B) Karl Marx ✓
- (C) Saint Simon
- (D) Martin Luther
Answer (the board’s key): (B)
Who among the following was given the title of Kaiser-i-Hind ?
- (A) Rabindra Nath Tagore
- (B) Mahatma Gandhi ✓
- (C) Shankaran Nair
- (D) Surendra Nath Banerjee
Answer (the board’s key): (B)
Which of the following movements started with 'Dandi March' ?
- (A) Civil Disobedience Movement ✓
- (B) Non-Cooperation Movement
- (C) Quit India Movement
- (D) Khilafat Movement
Answer (the board’s key): (A)
Amrit Bazar Patrika was the newspaper of which language ?
- (A) Hindi
- (B) Bengali ✓
- (C) Marathi
- (D) Gujarati
Answer (the board’s key): (B)
When was 'All India Trade Union Congress' established ?
- (A) 1848
- (B) 1881
- (C) 1885
- (D) 1920 ✓
Answer (the board’s key): (D)
When did the Soviet Union disintegrate ?
- (A) 1985
- (B) 1991 ✓
- (C) 1968
- (D) 1990
Answer (the board’s key): (B)
Which is the longest National waterway ?
- (A) National Waterway-1 ✓
- (B) National Waterway-2
- (C) National Waterway-3
- (D) National Waterway-4
Answer (the board’s key): (A)
Where is Sariska Wildlife Sanctuary located ?
- (A) Odisha
- (B) Maharashtra
- (C) Rajasthan ✓
- (D) Karnataka
Answer (the board’s key): (C)
Where is Kaiga Nuclear Power Plant located ?
- (A) Tamil Nadu
- (B) Karnataka ✓
- (C) Kerala
- (D) Uttar Pradesh
Answer (the board’s key): (B)
How many public sector oil refineries are functioning in India ?
- (A) 18 ✓
- (B) 20
- (C) 23
- (D) 25
Answer (the board’s key): (A)
By which name is Brahmaputra river known in Tibet ?
- (A) Jamuna river
- (B) Tsangpo river ✓
- (C) Yangtze river
- (D) Manas river
Answer (the board’s key): (B)
Which is the oldest oil refining unit in India ?
- (A) Barauni
- (B) Jamnagar
- (C) Dibrugarh
- (D) Bombay High
Which of the following is a plantation crop ?
- (A) Tea
- (B) Rubber
- (C) Sugarcane
- (D) All of these ✓
Answer (the board’s key): (D)
Natural gas is found with which mineral ?
- (A) Uranium
- (B) Limestone
- (C) Coal
- (D) Petroleum ✓
Answer (the board’s key): (D)
What is the main source of livelihood in Bihar ?
- (A) Agriculture ✓
- (B) Industry
- (C) Trade
- (D) All of these
Answer (the board’s key): (A)
Which of the following is not an economic activity ?
- (A) Agriculture
- (B) Communication
- (C) Poverty ✓
- (D) Transportation
Answer (the board’s key): (C)
What is the primary function of money ?
- (A) Store of value
- (B) Transfer of value
- (C) Medium of exchange ✓
- (D) Both (A) and (C)
Answer (the board’s key): (C)
Which of the following provides long term loans ?
- (A) Primary Agricultural Credit Society
- (B) Land Development Bank ✓
- (C) Commercial Bank
- (D) None of these
Answer (the board’s key): (B)
Which of the following is a part of non-economic infrastructure ?
- (A) Finance
- (B) Education ✓
- (C) Energy
- (D) Communication
Answer (the board’s key): (B)
As a result of globalization, which of the following has uninterrupted flow among different countries ?
- (A) Capital
- (B) Technology
- (C) Labour
- (D) All of these ✓
Answer (the board’s key): (D)
What is the removal of unnecessary controls and restrictions on economic activities by the government called ?
- (A) Privatization
- (B) Disinvestment
- (C) Liberalization ✓
- (D) Globalization
Answer (the board’s key): (C)
Where can a consumer complain if the value of the goods or service or the compensation amount exceeds Rs. 1 crore ?
- (A) District Forum
- (B) State Commission
- (C) National Commission ✓
- (D) All of these
Answer (the board’s key): (C)
Which is the best type of coal ?
- (A) Peat
- (B) Lignite
- (C) Anthracite ✓
- (D) Bituminous
Answer (the board’s key): (C)
Where is Kusheshwar Sthan Sanctuary located ?
- (A) Morena
- (B) Darbhanga ✓
- (C) Bhagalpur
- (D) Nandan Kanan
Answer (the board’s key): (B)
Where is contour ploughing done ?
- (A) Plain area
- (B) Coastal area
- (C) Mountainous area ✓
- (D) All of these
Answer (the board’s key): (C)
Which Earth Summit was held in Johannesburg ?
- (A) First
- (B) Second
- (C) Third ✓
- (D) Fourth
Answer (the board’s key): (C)
What type of crop is peanut ?
- (A) Rabi
- (B) Kharif ✓
- (C) Zaid
- (D) None of these
Answer (the board’s key): (B)
What is the rank of Bihar in the production of vegetables ?
- (A) First
- (B) Second
- (C) Third ✓
- (D) Fourth
Answer (the board’s key): (C)
Where is Bagmati project located ?
- (A) Sitamarhi ✓
- (B) Darbhanga
- (C) Saran
- (D) Rohtas
Answer (the board’s key): (A)
According to census 2011, which district of Bihar has the highest density of population ?
- (A) Sheohar ✓
- (B) Patna
- (C) Kaimur
- (D) Nalanda
Answer (the board’s key): (A)
Who appoints the Governor ?
- (A) Prime Minister
- (B) President ✓
- (C) Chief Minister
- (D) Chief Justice
Answer (the board’s key): (B)
Who formed Lok Janshakti Party ?
- (A) Ram Vilas Paswan ✓
- (B) Mulayam Singh
- (C) Kanshi Ram
- (D) Sharad Yadav
Answer (the board’s key): (A)
In case of dissolution of Panchayati Raj institutions, at what time interval is it mandatory to hold elections ?
- (A) 2 months
- (B) 6 months ✓
- (C) 1 year
- (D) 1 month
Answer (the board’s key): (B)
Meghalaya was formed from which state ?
- (A) Tripura
- (B) Assam ✓
- (C) Nagaland
- (D) Arunachal Pradesh
Answer (the board’s key): (B)
Who is the head of the village court ?
- (A) Sarpanch ✓
- (B) District Magistrate
- (C) Nyaya Mitra
- (D) Mukhiya
Answer (the board’s key): (A)
Which of the following countries has a Unitary Government system ?
- (A) Great Britain
- (B) France
- (C) China
- (D) All of these ✓
Answer (the board’s key): (D)
Which of the following is not a pressure group ?
- (A) Akhil Bharatiya Vidyarthi Parishad (ABVP)
- (B) All India Trade Union Congress
- (C) Indian National Congress ✓
- (D) Rashtriya Swayamsevak Sangh
Answer (the board’s key): (C)
Biju Janata Dal belongs to which state ?
- (A) Bihar
- (B) Jharkhand
- (C) Odisha ✓
- (D) Chattisgarh
Answer (the board’s key): (C)
Which sector has the maximum contribution to Gross Domestic Product ?
- (A) Primary sector
- (B) Secondary sector
- (C) Tertiary sector ✓
- (D) None of these
Answer (the board’s key): (C)
Which of the following has a three-tier structure?
- (A) Co-operative credit society
- (B) Consumer Protection Act
- (C) Panchayati Raj
- (D) All of these ✓
Answer (the board’s key): (D)
Which of the following does not include the value of depreciation?
- (A) GDP
- (B) GNP
- (C) NNP ✓
- (D) All of these
Answer (the board’s key): (C)
Which of the following is included in Indian economic reforms?
- (A) Liberalization
- (B) Privatization
- (C) Globalization
- (D) All of these ✓
Answer (the board’s key): (D)
What is the remuneration of capital?
- (A) Rent
- (B) Wages
- (C) Interest ✓
- (D) Mixed income
Answer (the board’s key): (C)
Which of the following assets has the least liquidity?
- (A) Currency
- (B) Bond
- (C) Real estate ✓
- (D) Bank deposit
Answer (the board’s key): (C)
When did Jawahar Rojar Yojana start?
- (A) 1988
- (B) 1989 ✓
- (C) 1990
- (D) 1991
Answer (the board’s key): (B)
Which of the following was formed with the aim of ensuring participation of states in economic planning ?
- (A) Planning Commission
- (B) National Development Council ✓
- (C) NABARD
- (D) Money Market
Answer (the board’s key): (B)
Who planned the main streets of Paris ?
- (A) Baron Haussmann ✓
- (B) Ebenezer Howard
- (C) Le Corbusier
- (D) Samuel Crompton
Answer (the board’s key): (A)
Where did Gandhiji establish Sabarmati Ashram ?
- (A) Gandhinagar
- (B) Ahmedabad ✓
- (C) Surat
- (D) Vadodara
Answer (the board’s key): (B)
Who was defeated in the battle of Sedan ?
- (A) France ✓
- (B) Germany
- (C) Austria
- (D) Prussia
Answer (the board’s key): (A)
Who among the following introduced compulsory military service in his country ?
- (A) Mazzini
- (B) Metternich
- (C) Bismarck ✓
- (D) Lenin
Answer (the board’s key): (C)
Which ruling dynasty in France was restored by the Congress of Vienna ?
- (A) Habsburg
- (B) Romanov
- (C) Slavic
- (D) Bourbon ✓
Answer (the board’s key): (D)
Whose contribution is economic planning ?
- (A) French Revolution
- (B) Russian Revolution ✓
- (C) American Revolution
- (D) All of these
Answer (the board’s key): (B)
Where was the first modern cotton mill established in India ?
- (A) Surat
- (B) Bombay
- (C) Calcutta ✓
- (D) Ahmedabad
Answer (the board’s key): (C)
Ho Chi Minh was the ruler of which country ?
- (A) North Vietnam ✓
- (B) South Vietnam
- (C) Laos
- (D) Cambodia
Answer (the board’s key): (A)
Where was Shetkari organization established ?
- (A) Rajasthan
- (B) Uttar Pradesh
- (C) Bihar
- (D) Maharashtra ✓
Answer (the board’s key): (D)
73rd Constitutional Amendment is related to which of the following ?
- (A) Panchayati Raj ✓
- (B) Municipality
- (C) Supreme Court
- (D) Election of President
Answer (the board’s key): (A)
Under whose Chairmanship was the State Reorganization Commission formed in 1953 ?
- (A) Fazal Ali ✓
- (B) Sardar Vallabhbhai Patel
- (C) Morarji Desai
- (D) Lal Bahadur Shastri
Answer (the board’s key): (A)
In which of the following cities has municipal corporation been already established ?
- (A) Bhagalpur ✓
- (B) Gopalganj
- (C) Sitamarhi
- (D) Rohtas
Answer (the board’s key): (A)
Which of the following does not have a federal system of government ?
- (A) India
- (B) China ✓
- (C) Spain
- (D) United States of America
Answer (the board’s key): (B)
Which of the following subjects has been placed in the State List?
- (A) Agriculture
- (B) Police
- (C) Irrigation
- (D) All of these ✓
Answer (the board’s key): (D)
How many languages are included in the Eighth Schedule of the Constitution of India?
- (A) 15
- (B) 22 ✓
- (C) 25
- (D) 21
Answer (the board’s key): (B)
Who allots election symbols to political parties?
- (A) Government of India
- (B) Constitution of India
- (C) Election Commission ✓
- (D) President
Answer (the board’s key): (C)
Section B · Written questions (32)
What do you understand by Historical Materialism?
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Model answer · Historical Materialism, Karl Marx
- 1.Karl Marx presented the materialist interpretation of history, which is known as historical materialism. He said that history is the story of continuous struggle between two classes for the control over the means of production, and according to him, economic powers are the root of every event and change in history.1 mark
- 2.According to this theory, social organisation changed with every change in production system, so the modes of production and economic relations are the main basis for the structure and change of society. Marx explained six stages of history: Age of Primitive Communism, Slave age, Feudal age, Capitalist age, Socialist age and Communist age.1 mark
- Begin with 'Karl Marx presented the materialist interpretation of history' to name the theory and its author.
- Write that 'economic powers are the root of every event and change in history' to show the economic basis.
- Mention 'social organisation changed with every change in production system' to link modes of production with social change.
Marks split from a structure derived from past papers (checked twice); not Bihar Board’s official scheme
What was the initial objective of France to colonize Indo-China?
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Model answer · France's objective, colonization of Indo-China
- 1.The primary objective of France in making Indo-China its colony was to face the mercantile competition of Dutch and British companies and to expand its commercial interests in Vietnam and surrounding regions. Main mercantile competitor of France in China was England, and the Indo-China region was a suitable place from where France could control the difficult situations of both India and China.1 mark
- 2.The second objective was that raw materials for industrialisation were supplied from colonies and market was available for manufactured goods. Thus France wanted to secure raw materials and find new markets for its industrial products from Indo-China.1 mark
- Mention 'mercantile competition' with Dutch and British companies to earn the commercial interests point.
- Write the exact phrase 'raw materials' and 'market' for manufactured goods to earn the second point.
Marks split from a structure derived from past papers (checked twice); not Bihar Board’s official scheme
What impact did British economic policies have on Indian agriculture?
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Model answer · British economic policies, Indian agriculture
- 1.British economic policies led to the commercialization of Indian agriculture, forcing farmers to produce cash crops like Indigo, cotton and sugarcane which the government collected at its own rate for use as raw materials in their own industries. The farmers producing cotton and indigo suffered from this policy.1 mark
- 2.Due to heavy land revenue under the permanent settlement, the Zamindars had to pay a fixed land-revenue as tax to the government but collected more taxes than they had to pay. This exploitation under the Zamindari system pushed Indian farmers into a debt trap, and the condition of agriculture became miserable.1 mark
- Write 'commercialization' and 'cash crops' with examples Indigo, cotton, sugarcane in the first point.
- Write 'land revenue' and 'permanent settlement' while explaining the Zamindari exploitation in the second point.
- Do not repeat the cash crop explanation while describing the debt trap.
Marks split from a structure derived from past papers (checked twice); not Bihar Board’s official scheme
Under what circumstances was the Indian National Congress established?
How the model answer begins
1. In 1885 A.O. Hume founded the Indian National Congress (at Bombay) to organise Indians politically and place their grievances before the British government.
The full answer from Medha Ma’am →Who adopted the 'golden middle class' policy and why?
How the model answer begins
1. The policy of 'Golden Mean' was adopted by the French ruler Louis Philippe. He was a liberal but highly ambitious king who came to power after the revolution of July 1830, getting throne through the liberals,…
The full answer from Medha Ma’am →What was the purpose of the Vienna Congress?
How the model answer begins
1. The main objective of the Vienna Congress was to undo the changes brought about in Europe by Napoleon. The objective of the Conference was to re-establish the system that was totally disturbed by Napoleonic wars and…
The full answer from Medha Ma’am →How nationalism is the result of political awakening in the modern world ? Discuss.
How the model answer begins
1. Nationalism is the outcome of the political awakening of modern world. This is a feeling that becomes the bearer of unity among the people of a definite geographical, cultural or social environment.
The full answer from Medha Ma’am →Explain the role of Gandhiji in the Indian National movement.
How the model answer begins
1. Gandhiji started his experiments with Satyagraha and non-violence in India through the Champaran Satyagraha in 1917. He led the farmers' movement in Champaran and Kheda and the workers' movement in Ahmedabad and got…
The full answer from Medha Ma’am →What is the main function of State Finance Commission ?
How the model answer begins
1. The main function of the State Finance Commission is to review the distribution of taxes, duties, and tolls between the state and local bodies. It is formed at the end of every five years to review the financial…
The full answer from Medha Ma’am →How is the Right to Information beneficial for accountable democracy ?
How the model answer begins
1. Right to Information brings transparency in administration. This law gives citizens the right to obtain information about the activities and decisions of the government, so that people can know how the administration is…
The full answer from Medha Ma’am →What do you understand by dual governance system ?
How the model answer begins
1. Dual government is a system in which the same country has two levels of government — a central (union) government for the whole country and state governments for its regions or provinces.
The full answer from Medha Ma’am →What is meant by horizontal distribution of power ?
How the model answer begins
1. Horizontal distribution of power means that power is shared among different organs of government such as the legislature, executive, and judiciary.
The full answer from Medha Ma’am →Explain the main organs of Municipal Corporation.
How the model answer begins
1. The most important organ of the Municipal Corporation is the Municipal Council, whose members are elected by the public. A municipal corporation is divided into several wards and the people of each ward elect their…
The full answer from Medha Ma’am →What are the challenges of democracy in current Indian politics ? Discuss.
How the model answer begins
1. Economic and social inequality, poverty and illiteracy keep people from taking part in democracy equally.
The full answer from Medha Ma’am →What is meant by Human Development Index ?
How the model answer begins
1. Human Development Index as proposed in first Human Development Report was prepared by United Nation Development Program (UNDP) under the direction of Mahbub-Ul-Haq. Human Development Report as published by UNDP compares…
The full answer from Medha Ma’am →What is economic activity ?
How the model answer begins
1. An economic activity is one through which people earn income to fulfil the demands and needs of their family members. All such activities which generate income are known as economic activities, and they involve the…
The full answer from Medha Ma’am →What was the purpose of the formation of World Trade Organization ?
How the model answer begins
1. The World Trade Organisation (WTO) was formed with the aim to liberalise international trade. It was set up in 1995 to make international trade easier and smoother so that goods and services could move between countries…
The full answer from Medha Ma’am →What do you understand by double counting ?
How the model answer begins
1. Double counting means counting the value of a product more than once while estimating National Income. Because of this double counting, income appears to be more than actual income.
The full answer from Medha Ma’am →Discuss the role of infrastructure in the economic development of the country.
How the model answer begins
1. Infrastructure denotes all those facilities and services which are helpful in economic development of country. A country with developed infrastructure is more developed. Thus infrastructure provides the foundation on…
The full answer from Medha Ma’am →Describe the judicial system set up by the government for consumer protection.
How the model answer begins
1. A three tier semi-judicial system has been established by the government under the Consumer Protection Act 1986 for the redressal of complains of consumers. This system consists of District Forum, State Commission and…
The full answer from Medha Ma’am →What is the need for water conservation and management ?
How the model answer begins
1. The demand for water is continuously increasing due to rising population and industrialization. Due to increase in population in cities and urban life style, there has been rapid increase in the demand for the water,…
The full answer from Medha Ma’am →Define plantation agriculture with an example.
How the model answer begins
1. Plantation agriculture is a method of planting one or more variety of plants for commercial production in large economic units. It is a type of commercial farming in which, similar to industries, there is provision of…
The full answer from Medha Ma’am →Mention any two measures for soil conservation.
How the model answer begins
1. In hilly region soil erosion can be checked by contour ploughing and terrace farming on hilly slopes which can prevent soil erosion. This method involves cultivating crops on the slopes in the form of steps so that the…
The full answer from Medha Ma’am →What is meant by resource planning ?
How the model answer begins
1. Resource planning is a widely accepted strategy for the judicious utilisation of resources. It is essential for the development of any country because along with diversity in the availability of resources there is…
The full answer from Medha Ma’am →What do you mean by organic minerals ?
How the model answer begins
1. Organic minerals are those minerals which contain remains of organic matter such as plant and animal fossils. They are formed by the transformation of buried animal and plant life under the surface of the earth.
The full answer from Medha Ma’am →What is meant by density of population ?
How the model answer begins
1. Density of population refers to the number of people living per unit area.
The full answer from Medha Ma’am →Explain the major National waterways of India.
How the model answer begins
1. National Waterway Number 1 is developed on the river Ganga and its total length is 1620 kilometers between Allahabad and Haldia.
The full answer from Medha Ma’am →Write a note on the environmental importance of forests.
How the model answer begins
1. Forests maintain the balance of oxygen and carbon dioxide in the atmosphere. Forest is not only a resource but an important factor in the making of the ecosystem and it enables all living beings to live in a state of…
The full answer from Medha Ma’am →Suggest measures to reduce the incidence of flood.
How the model answer begins
1. The incidence of flood can be reduced by construction of embankments in flood-prone areas and construction of Dams to control the water level of rivers. The construction of Dams and embankments checks the destruction…
The full answer from Medha Ma’am →What are the factors responsible for drought ?
How the model answer begins
1. The main cause of drought is lack of rainfall. When in rainy season there are no clouds in the sky and bright sunny condition prevails, then farmers are not able to work in their fields and even drinking water becomes…
The full answer from Medha Ma’am →What are the alternative communication mediums used during natural disaster ?
How the model answer begins
1. Radio and Amateur or HAM Radio are the primary means of alternative communication during natural disasters. Radio waves are electromagnetic and sent through Antenna, with wireless instruments like walkie-talkie proving…
The full answer from Medha Ma’am →Which areas are more affected by earthquake and tsunami ?
How the model answer begins
1. The effect of earthquake is seen more in those areas where the rocks of the surface are destroyed. These are regions of fold mountains, regions of faulted areas on the surface, oceanic deeps, mid oceanic ridges and…
The full answer from Medha Ma’am →
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