NCERT Solutions for Class 7 Social Science History Chapter 8 Devotional Paths to the Divine

Devotional Paths to the Divine Class 7 Questions and Answers History Chapter 8

Class 7 History Chapter 8 NCERT Textbook Questions and Answers

Question 1.
Match the foilowing-

The Buddha Namghar
Shankaradeva Worship of Vishnu
Nizamuddin Auliya Quertioned social differences
Nayanars Sufi saint
Alvars Worship of Shiva

Answer:

The Buddha Quertioned social differences
Shankaradeva Namghar
Nizamuddin Auliya Sufi saint
Nayanars Worship of Shiva
Alvars Worship of Vishnu

Question 2.
Fill in the blanks-
1. Shankara was an advocate of ……………..
2. Ramanuja was influenced by the …………….
3. ………….., …………… and ………………. were advocates of Virashaivism.
4. ……………. was an important centre of Bhakti tradition in Maharashtra.
Answer:
1. Advaita
2. Alvars
3. Basavana, Allama Prabhu, Akkamadevi
4. Pantharpur.

Question 3.
Describe the beliefs and practices of the Nathpanthis, Siddhas and Yogis.
Answer:
A number of religions groups that emerged during this period criticised the ritual and other aspects of conventional religion and the social order, using simple, logical arguments. Among these were the nathpanthis, Siddhacharas And Yogis.

Beliefs and practices of the Nathpanthis, Siddhas and Yogis-

  • They advocated renunciation of the world.
  • According to them, the path to salvation lay in meditation on the formers. Ultimate Reality and the realisation of oneness with it.
  • To achieve the above they advocated intense training of the mind and body like yogasanas, breathing exercises and meditation.
  • For their beliefs and practices, these groups became particularly popular among ‘low’ castes.

Question 4.
What were the major ideas expressed by Kabir ? How did he express there?
Answer:

  1. Kabir’s teachings were based on a complete, indeed vehement; rejection of the major religions traditions.
  2. Kabir’s teaching openly ridiculed all form of external worship of both Brahmanical Hinduism and Islam the pre-eminence of the priestly classes and the caste system.
  3. The language of his poetry was a form of spoken Hindi widely understood by ordinary people.
  4. Kabir believed in a formless supreme God and preached that the only path to salvation was through bhakti or devotion.

Question 5.
What were the major beliefs and practices of the sufis?
Answer:
Major beliefs and practices of the sufis-

  1. Sufis were Muslim Mystics. They rejected outward religionsity and emphasised love and devotion to God and compassion towards all fellow human beings.
  2. The Sufis often rejected the elaborate rituals and codes of behaviour demanded by Muslim religions scholars.
  3. They sought union with God much as a lover seeks his beloved with a disregard for the world.
  4. Like the saint poets, the sufis too, composed poems expressing their feelings, and a rich literature in prose, inducting anecdotes and fables, developed around them.
  5. The sufis also believed that the heart can be trained to look at the world in a different way. They developed elaborate methods of training using Zikr (Chanting of a name or sacred formula), contemplation, same (singing), raqs (dancing), discussion of parables, breath control, etc. under the guidance of a master or pir.

Question 6.
Why do you think many teachers, rejected prevalent religions beliefs and practices?
Answer:
Many teachers rejected prevalent religions beliefs and practices because they were irrational, unlogical and very difficult to understand. For example, Kabir and Guru Nanak rejected all orthodox religions and their beliefs and practices. Many teachers did not favour casteism; the feeling of up or down or low or high castes. They favoured humanism.

Some teachers like Tulsidas and Surdas accepted beliefs and practises but wanted to make these accessible to all though the languages of the common people.

Question 7.
What were the major teachings of Baba Guru Nanak?
Answer:
Major teachings of Baba Guru Nanak-

  1. Guru Nanak emphasized the importance of the worship of one God. He insisted that caste, creed or gender was irrelevant for attaining liberation. His idea of liberation was not that of a state of inert bliss but rather the pursuit of active life with a strong sense of social commitment.
  2. He himself used the terms nam, dan and isnan for the essence of his teachings which actually meant right worship, welfare of others and purity of conduct.
  3. His teachings are now remembered as nam-japna, kirt-karma and vand-chhakha, which also underline the importance of right belief and worship, honest living, and helping others.

Question 8.
For either the Virashaivas or the sants of Maharashtra, discuss their attitude towards caste.
Answer:
The Virashaivars or the saint of Maharashtra had a very progressive humanistic attitude, they opposed casteism or inequality based on any ground. From the thirteen to seventeen centuries Maharashtra saw a great number of saint poets.

The most important among them were Janeshwar, Namdev, Eknath and Tukaram as well women like Sakhu bai and the family of Chokhamela. They belonged to the “untouchable” Mohar Caste.

There was a Gujarati Saint Narsi Mehtra. He was a famous Vaishnava. He said, “They (men and women) are vaishnavas who understand the pain of others.

All saints (male as well female) stressed Bhakti particularly on the vithala (a form of Vishnu). They participated in the temple of Pantherpur. They favoured the nation of a personal god residing in the hearts of all people.

These saints, poets, rejected castism and all types of ritualism. They did not favour disparity and differences based on birth.

Question 9.
Why do you think ordinary people preserved the memory of Mirabai?
Answer:

  1. Mirabai was a Rajput princes married into the royal family of Mewar in the sixteenth century. Mirabai became a disciple of Ravidas, a saint from a caste untouchablef. She was devoted to Krishna and composed inumerable bhajans expressing her intense devotion.
  2. Her songs also openly challenged the norms of the “upper” caste and became popular with the masses in Rajasthan and Gujarat.

Question 10.
Find out whether in your neighborhood these are any dargahs, gurudwaras or temples associated with saints of the bhakti tradition in your neighborhood. Visit any one of these and describe what you see and hear?
Answer:
Yes, these are many dargahs, gurudwaras or temples associated with saints of bhakti tradition in our neighbourhood.

I have visited all these religious places from time to time along with my mother or father or elder brother.

I have seen that people go there with devotion and they ofter prayer and hear preaching of religious people with great devotion.

Question 11.
For any of the Saint-poets where compositions have been included in this chapter, find out more about their works, noting down other poems. Find out whether these are sung, how they are sung, and what the poets wrote about?
Answer:
We have read about many bhakti saint and sufi saint in this chapter. I have heard about Kabir, Baba Guru Nanak, Mirabai, Goswami Tulsidas and Surdas. Their religious works poems, bhajans are read out and sung at religious place and by bhakt singers and poets. I have heard devotional song on radio and Television. I have also read certain books related . with the above saint poets.

Question 12.
There are several saint-poets whose names have been mentioned but their works have not been included in the chapter. Finds out more about sung and what their compositions were about.
Answer:

  1. All Marathi saint such as Janeshwar, Namdev, Eknath and Tukaram had written and sung in Marathi.
  2. Narsi Mehta had written and sung in Gujarati.
  3. Tulsidas had written in Awdhi (Hindi).
  4. Surdas had written in Brij Bhasha (Hindi).
  5. Mirabai had written in Rajasthani (Hindi).
  6. Kabir had written in composit language taking words from Hindi, Urdu, Punjabi and other languages of India. His language is called Khichri Bhasha.
  7. Guru Nanak Dev had written and sung in Hindi and Punjabi.
  8. They were not in a favour of converting Hindus to Islam.

NCERT Solutions for Class 7 Social Science

NCERT Solutions for Class 9 Social Science Geography Chapter 5 Natural Vegetation and Wildlife

NCERT Solutions for Class 9 Social Science Geography Chapter 5 Natural Vegetation and Wildlife

Textbook Exercises

Question 1.
Choose the right answer from the four alternatives given below:

(i) To which one of the following types of vegetation does rubber belong to
(a) Tundra
(b) Tidal
(c) Himalayan
(d) Tropical Evergeen
Answer:
(d) Tropical Evergeen

(ii) Cinchona trees are found in the areas of rainfall more than
(a) 100 cm
(b) 50 cm
(c) 70 cm
(d) less than 50 cm
Answer:
(a) 100 cm

(iii) In which of the following state is the Simlipal bio-reserve located?
(a) Punjab
(b) Delhi
(c) Orissa
(d) West-Bengal
Answer:
(d) West-Bengal

(iv) Which one of the following bio-reserve of India is not included in the world network of bioreserve.
(a) Monas
(b) Dihang-Dibang
(c) Gulf of Mannar
(d) Nanda Devi
Answer:
(d) Nanda Devi

Question 1.
(i) Define an eco-system.
Answer:
Escoystem is meant by the physical environment of a place formed by all kinds of plants, birds and animals of that area.

(ii) What factors are responsible for the distribution of plants and animals in India ?
Answer:
The distribution of plants and. animals are mainly determined by the climate’ of that area. The other determiner factors of this distribution are soil, relief and drainage etc.

(iii) What is biosphere ? Give two examples.
Answer:
A bio-reserve is a place which consists of fairly vast wild land and is devoted to the protection and preservation of flora and fauna of the country in the very natural form.
Examples : Gulf of Mannar, Nilgiri.

(iv) Name two animals having habitat in different types of vegetation.
Answer:
(i) Tropical Rain Vegetation: Elephant, monkey
(ii) Deciduous Vegetation : Lion, tiger
(iii) Thorn-Scrubs : Fox, Lion,
(iv) Temperate Vegetation: Kashmir Stag, Leopard
(v) Alpine-Tundra : Yak, Leopard
(vi) Tidal vegetation: Tiger, turtles

Question 3.
Distinguish between
(i) Flora and Fauna
(ii) Tropical evergreen and deciduous forests.
Answer:

Flora Fauna
1. It refers to the plants. 1. It stands for animal and wild life.
2. It came first into existence 2. It came into existence after the flora.
3. It can covert energy derived from the sun into food. 3. It cannot convert sun energy into food.

(ii) Evergreen and deciduous forests.
Answer:

Evergreen forests Deciduous forests
1. These are the forests found in the areas with more than 200 cm of rainfall. 1. These are found in the areas with 70-200 cm of rainfall.
2. There the trees reach great height upto 60 metre or more. 2. Trees do not reach at such a height.
3. These are found in Western Ghats and the island groups’ of India. 3. These are found in the north-eastern states along with the foot hills of Himalayas, Jharkhand and Orissa.

Question 4.
Name different types of vegetation found in India and describe the vegetation of high altitudes.
Answer:
The major vegetation types of India are the following:

  1. The Tropical Rain forests.
  2. The Deciduous forests.
  3. The Tropical thorn forests arid Scrubs.
  4. The Temperate forests with Grassland.
  5. Tine Alpine and Tundra Vegetation.

The vegetation of high altitudes are :
ebony, mahogany and rozewood.

Question 5.
Quite a few species of plants and. animals are endangered. Why?
Answer:
There are about 1300 plant Species and a few animal species are endangered. This is. due to executive exploitation of the plants and animals by man. The other main causes include animal hunting by man for commercial purposes. Pollution due to chemical and industrial waste, acid deposits, introduction of alien species and reckless cutting of the forests to bring land under cultivation and inhabitation, are also responsible for.the imbalance.

Question 6.
Why India has a rich hertiage of flora and fauna?
Answer:
India is one of the 12 mega biodiversity countries of the world. With about 47,000 plant species and 89,000 species of animals, India is tenth in the world and fourth in Asia in plant diversity. There are about 15,00.0 flowering plants in our country which constitute six per cent of the world’s total. India is also rich in non-flowering plants such as finis, algae and fungi and has a huge variety of fish in its fresh marine waters.

India has a rich heritage of flora and fauna. It is due to factors relating to the following:

1. Temperature:
The character and extent of vegetation are mainly determined by temperature along with hurmidity in the air; precipitation and soil. On the slopes of the Himalayas and -the hills of the Peninsula above the height of 915 metres, the fall in the temperature affects the types of vegetation and its growth, and changes it from tropical to subtropical temperate and alpine

Temperature characteristics of the Vegetation Zones
NCERT Solutions for Class 9 Social Science Geography Chapter 5 Natural Vegetation and Wildlife 1

2. Sunlight:
The variation in sun’s radiant energy at different places is due to difference in latitude, altitude/season and duration of the day. Due to the factor of sunlight, trees grow faster in summer.

3. Precipitation:
Almost the entire rainfall is brought in by the advancing south west monsoon (June to Sept.) and retreating north east monsoon. Areas of heavy rainfall have more dense vegetation as compared to other areas.

4. Soil:
Changes in soil conditions have given rise to peculiar types of vegetation in many areas such as mangrove forests, swamps and sandy coastal forests.

5. Relief:
It is another important factor affecting vegetation—plains, plateaus and mountains have different types of vegetation.

These Solutions are part of NCERT Solutions for Class 9 Social Science. Here we have given NCERT Solutions for Class 9 Social Science Geography Chapter 5 Natural Vegetation and Wildlife.

NCERT Solutions for Class 8 Social Science Geography Chapter 2 Land, Soil, Water, Natural Vegetation and Wildlife Resources

Land, Soil, Water, Natural Vegetation and Wildlife Resources Class 8 Questions and Answers Geography Chapter 2

Geography Class 8 Chapter 2 NCERT Textbook Questions and Answers

Question 1.
Observe the land, type of soil and water availability in the region you live. Discuss in your class, how it has influenced the lifestyle of people there.
Answer:
Hints :
Land, type of soil and water availability influence the life style of the people living there because generally human activities are influenced by environment. For remaining take the help of your class teacher.

Question 2.
Table 2.1 : Land use in selected countries
NCERT Solutions for Class 8 Social Science Geography Chapter 2 Land, Soil, Water, Natural Vegetation and Wildlife Resources 1
Study the above table and answer the following :
(i) Name the countries having the highest percentage of land under cropland, forest, pasture and other uses.
(ii) How would you relate the land use patterns of these countries with the probable economic activities?
Answer:
(i) The countries with the highest use of land under cropland, forest, pasture and other crops are as follows :
Cropland : India (57%)
Forest : Japan (67%)
Pasture : Australia (56%)
Other uses : Canada (52%)

(ii) The land use pattern of these areas affects the economic activities of these countries in the sense that people and their demands are ever growing, however, the availability of land is limited. In the same way the quality of land is also different from one place to another. The common man is encroaching land for housing and industrialisation purposes. In rural areas land is expanded to increase agricultural needs. This also affects the social culture.

Question 3.
Activity : In India soils could be alluvial, black, red, laterite desertic and mountain soil. Collect a handful of different types of soil and observe. How are they different?
Answer:

  • Alluvial soil : It is very fertile and good for crops. It is generally found along the belt of rivers.
  • Black soil : It is black in colour. It is fertile and good for cotton crops.
  • Red soil : It is red in colour and rich in iron. It is porous in nature.
  • Laterite soil : It is less fertile with low content of nitrogen, phosphate and calcium.
  • Desertic soil : Mostly sandy and alkaline in nature.
  • Mountain soil : Mostly thin and infertile.

Question 4.
Answer the following questions.
(i) Which are two main climatic factors responsible for soil formation?
(ii) Write any two reasons for land degradation today.
(iii) Why is land considered an important resource?
(iv) Name any two steps that government has taken to conserve plants and animals.
(v) Suggest three ways to conserve water.
Answer:
(i) The two main climatic factors responsible for soil formation are temperature and rainfall. Rainfall contributes in breaking the rocks by applying pressure. Temperature fluctuations between hot and cold also form cracks in the rocks.

(ii) Reasons for land degradation are :

  • Destruction of forest cover.
  • Ever growing demand of the growing population.

(iii) Land is considered an important resource because it provides surface for agriculture, living, forestry, industries, construction, etc. Most of the activities take place on land.

(iv) Steps taken by the government to conserve plants and animals are :

  • Establishment of natural parks and wildlife sanctuaries in different parts of the country.
  • Conservation of important species of plants and animals.

(v) Three ways to conserve water are :

  • By rain water harvesting : By this method rain water can be collected and used at the time of scarcity.
  • Drip irrigation to be practised in dry regions.
  • Proper irrigation system so that water is not lost at the time of irrigation.

Question 5.
Tick the correct answer.
(i) Which one of the following is NOT a factor of soil formation?
(a) time
(b) soil texture
(c) organic matter
Answer:
(b) soil texture

(ii) Which one of the following methods is most appropriate to check soil erosion on steep slopes?
(a) shelter belts
(b) mulching
(c) terrace cultivation
Answer:
(c) terrace cultivation

(iii) Which one of the following is NOT in favour of the conservation of nature?
(a) switch off the bulb when not in use
(b) close the tap immediately after using
(c) dispose playbacks after shopping
Answer:
(c) dispose playbacks after shopping

Question 6.
Match the following :

(i) Land use (a) prevent soil erosion
(ii) Humus (b) land suitable for agriculture
(iii) Rock dams (c) productive use of land
(iv) Arable land (d) organic matter deposited on top soil
(e) contour ploughing

Answer:

(i) Land use (c) productive use of land
(ii) Humus (d) organic matter deposited on top soil
(iii) Rock dams (a) prevent soil erosion
(iv) Arable land (b) land suitable for agriculture

Question 7.
State whether the given statement is true or false.
If true, write the reasons.
(i) Ganga-Brahmaputra plain of India is an overpopulated region.
(ii) Water availability per person in India is declining.
(iii) Rows of trees planted in the coastal areas to check the wind movement is called intercropping.
(iv) Human interference and changes of climate can maintain the ecosystem.
Answer:
(i) True
(ii) True
(iii) False
(iv) True.

Question 8.
Activity
Discuss some more reasons which are responsible for changes of land use pattern. Has your place undergone any change in the land use pattern in recent years?
Find out from your parents and elderly people. You can conduct an interview by asking the following questions.
NCERT Solutions for Class 8 Social Science Geography Chapter 2 Land, Soil, Water, Natural Vegetation and Wildlife Resources 2
NCERT Solutions for Class 8 Social Science Geography Chapter 2 Land, Soil, Water, Natural Vegetation and Wildlife Resources 3
Answer:
NCERT Solutions for Class 8 Social Science Geography Chapter 2 Land, Soil, Water, Natural Vegetation and Wildlife Resources 4
NCERT Solutions for Class 8 Social Science Geography Chapter 2 Land, Soil, Water, Natural Vegetation and Wildlife Resources 5

NCERT Solutions for Class 8 Social Science

NCERT Solutions for Class 7 Social Science Geography Chapter 7 Human Environment: Settlement, Transport and Communication

Human Environment: Settlement, Transport and Communication Class 7 Questions and Answers Geography Chapter 7

Class 7 Geography Chapter 7 NCERT Textbook Questions and Answers

Question 1.
Answer the following questions :
(i) What are the four means of transport?
Answer:
Four major means of transport are as follows :
(a) Roadways
(b) Railways
(c) Waterways
(d) Airways

(ii) What do you understand by the term ‘settlement’?
Answer:
A cluster of houses form a settlement. Hence a settlement is a place where people build their houses.

(iii) Which are the activities practised by the rural people?
Answer:
Rural people are engaged in the activities like agriculture, fishing, forestry, craftswork and trading etc.

(iv) Mention any two merits of railways.
Answer:
Merits of railways

  1. It carries heavy and bulky goods.
  2. It carries people to long distance very quickly and cheaply.

(v) What do you understand by communication?
Answer:
Communication is the means for carrying messages from one part of the country to another.

(vi) What is mass media?
Answer:
Mass media is a way to learn about world and the events occurring in the world.

Question 2.
Tick the correct answer-
(i) Which is Not a means of communication?
(a) telephone
(b) books
(c) table
Answer:
(c) table.

(ii) Which type of road is constructed under ground?
(a) flyover
(b) expressways
(c) subways
Answer:
(c) subways.

(iii) Which mode of transport is most suitable to reach an island?
(a) ship
(b) train
(c) car
Answer:
(a) ship.

(iv) Which vehicle does not pollute the environment?
(a) cycle
(b) bus
(c) aeroplane
Answer:
(a) cycle.

Question 3.
Match the following :

(i) Internet (a) areas where people are engaged in manufacturing, trade and services
(ii) Canal route (b) closely built area of houses
(iii) Urban areas (c) inland waterway
(iv) Compact settlement (d) a means of communication

Answer:

(i) Internet (d) a means of communication
(ii) Canal route (c) inland waterway
(iii) Urban areas (a) areas where people are engaged in manufacturing, trade and services
(iv) Compact settlement (b) closely built area of houses

Question 4.
Give reasons-
(i) Today’s world is shrinking.
Answer:
We are living in a world without national and communication boundaries. World has become shrunken mainly because information is available at any place from any comer of the world on a click of the mouse. This is highly sophisticated world without distances. With this kind of under connectivity people to people, people to services and institutions-across the world, at a great speed we are becoming large global society.

Question 5.
For fun-
(i) Conduct a survey in your locality and And out how people commute to their respective workplaces using-
(a) more than two modes of transport
(b) more than three modes of transport
(c) stay within walking distance
Answer:

Hints:

  • First of all, prepare a schedule consisting of the families living in your locality like the following.
    NCERT Solutions for Class 7 Social Science Geography Chapter 7 Human Environment Settlement Transport and Communication 1
  • Now ask each family and tick out the column against them regarding which modes of transport they use.
  • After filling the schedule, now do calculations by counting numbers of each category of the mode of transport.
  • A sample report
    Out of 30 families, 15 families use two or more modes of transport. Out of which 5 families use more than three modes of transport.
  • families live within walking distance, it means they do not use any mode of transport.

(ii) Mention which mode of communication you will prefer most in the following situations-
1. Your grandfather has suddenly fallen ill. How will you inform the doctor?
2. Your mother wants to sell the old house. How will she spread this news?
3. You are going to attend the marriage of your cousin for which you will be absent from the school for the next two days. How will you inform the teacher?
4. Your friend has moved out with his/her family to New York. How will you keep in touch on a daily basis?
Answer:

  1. Telephone
  2. Newspaper
  3. Letter/Application
  4. Telephone/Intemet

NCERT Solutions for Class 7 Social Science

NCERT Solutions for Class 10 Social Science Geography Chapter 7 Life Lines of National Economy

NCERT Solutions for Class 10 Social Science Geography Chapter 7 Life Lines of National Economy

Textbook Exercises

1. Multiple choice questions.

1. Which two of the following extreme locations are connected by the east-west corridor?
(a) Mumbai and Nagpur
(b) Mumbai and Kolkata
(c) Silcher and Porbandar
(d) Nagpur and Siligudi
Answer:
(c) Silcher and Porbandar

2. Which mode of transportation reduces trans-shipment losses and delays?
(a) Railways
(b) Pipeline
(c) Roadways
(d) Waterways
Answer:
(b) Pipeline

3. Which one of the following is not connected with the H.V.J. Pipeline?
(a) Madhya Pradesh
(b) Gujarat
(c) Maharashtra
(d) Uttar Pradesh
Answer:
(c) Maharashtra

4. Which one of the following ports is the deepest land-locked and well-protected port along the east coast?
(a) Chennai
(b) Tuticorin
(c) Paradip
(d) Vishakhapatnam
Answer:
(d) Vishakhapatnam

5. Which one of the following is the most important modes of transportation in India?
(a) Pipeline
(b) Roadways
(c) Railways
(d) Airways
Answer:
(d) Airways

6. Which one of the following terms is used to describe trade between two or more countries?
(a) Internal trade
(b) Extenal trade
(c) International trade
(d) Local trade
Answer:
(c) International trade

2. Answer the following questions in about 30 words.

Question 1.
State any three merits of roadways.
Answer:
1. As compared to railways, construction cost of roadways is lower;
2. Roadways provide door-to-door service;
3. These are used as feeder to other modes of transportation such as link between railways, stateline, air and sea ports.

Question 2.
Where and why is the rail transport the most convenient means of transportation?
Answer:
Railways help conduct activities like business, sightseeing. It is a great integrating force. The network of railways is best suited to plain areas where agriculture and industry grow rapidly due to facilities available by industry it.

Question 3.
What is the significance of the border roads?
Answer:
Border roads are important strategically. These have helped develop northern and north-eastern areas. In fact, they have increased accessibility in areas of difficult terrain, besides the economic development of the these areas.

Question 4.
What is meant by trade? What is the difference between international and local trade?
Answer:
Trade is the medium through which goods are bought and sold. Local trade conducted in any area: city, state, and country. International trade is a trade between one country and other countries.

3. Answer the following questions in about 120 words.

Question 1.
Why are means of transportation and communication called the lifelines of nations and its economy?
Answer:
In today’s modern world the means of transport and communication have no doubt turned as the lifelines of a country and also of its economy.
The various forms of transport that are used to carry passengers and goods from one place to another are called the means of transport. On the other hand communication means sending messages from one place to another. These are known as the ‘Lifelines’ of a country because of the following reasons-

  1. They bring the far-flung areas of a country quite closer to each other.
  2. They carry the greatest number of passengers in longest journeys in lesser time but with greater comforts.
  3.  They carry thousands of tonnes of different commodities from one part of the country to the other and thus avoid much hardships to the people.
  4. Also in the war times, their importance can hardly be emphasized. They bring the whole country at the back of the armed forces and facilitate the movement of arms, ammunition and other supplies.
  5. These means of communication and transport also help the Government to maintain law and order.
  6. These various means have also forged the bonds of national unity in our country by promoting social and cultural contacts between the various people of the country.

Question 2.
Write a note on the changing nature of the international trade in the last fifteen years.
Answer:
In today’s modern world the means of transport and communication have no doubt turned as the lifelines of a country and also of its economy.
The various forms of transport that are used to carry passengers and goods from one place to another are called the means of transport. On the other hand communication means sending messages from one place to another. These are known as the ‘Lifelines’ of a country because of the following reasons-

  1. They bring the far-flung areas of a country quite closer to each other.
  2. They carry the greatest number of passengers in longest journeys in lesser time but with greater comforts.
  3. They carry thousands of tonnes of different commodities from one part of the country to the other and thus avoid much hardships to the people.
  4. Also in the war times, their importance can hardly be emphasized. They bring the whole country at the back of the armed forces and facilitate the movement of arms, ammunition and other supplies.
  5. These means of communication and transport also help the Government to maintain law and order.
  6. These various means have also forged the bonds of national unity in our country by promoting social and cultural contacts between the various people of the country.

Quiz Drive

  1. Northern terminal of the North-south corridor.
  2. The name of National Highway No. 2.
  3. The headquarter of the southern railway zone.
  4. The rail gauge with a track width of 1.676m
  5. The southern terminal of the National Highway No. 7.
  6. A Riverine Port.
  7. Busiest Railway junction in Northern India.

Answer:
1. Srinagar, Broad Ganga, Kanyakumari Kolkata, HBJ.
Students take the help of teacher.

Activity

Start your search vertically, horizontally or diagonally and reach to various destinations across the country.
NCERT Solutions for Class 10 Social Science Geography Chapter 7 Life Lines of National Economy
Some destinations have been searched. The students may search others with the help of the teachers

Sher Shah Suri Marg, Chennai, Broad Gauge, Mugalsarai, Kolkata, Srinagar, Kanyakumari, Thane, HBJ, Mumbai.

These Solutions are part of NCERT Solutions for Class 10 Social Science. Here we have given NCERT Solutions for Class 10 Social Science Geography Chapter 7 Life Lines of National Economy.

NCERT Solutions for Class 12 Physics Chapter 8 Electromagnetic Waves

NCERT Solutions for Class 12 Physics Chapter 8

Wondering on how to Download NCERT Solutions for Class 12 Physics Chapter 8 Electromagnetic Waves PDF? Then, this is the correct place to get the answer to your queries. At our site, expert teachers of physics designed the solutions for all important questions in each chapter of electromagnetic waves.

These solutions have been prepared and explained in a wat that any of the students of class 12 can easily understand. The step by step NCERT solutions of class 12 physics chapter 8 will help you score high marks in the board and competitive examinations. Access the NCERT exercise solutions for class 12 physics ch 8 electromagnetic waves PDF offline from this page & prepare well.

Class 12 Physics NCERT Solutions Chapter 8 Electromagnetic Waves PDF

In Chapter 8, Students of class 12 will deal with the concept called Electromagnetic Waves. The three most important topics of this chapter are electromagnetic waves, displacement current, and the electromagnetic spectrum. The topics and sub-topics in Chapter 8 Electromagnetic Waves are covered in NCERT Solutions PDF.

Moreover, these NCERT Questions and Solutions will also explain the formulas, illustration, and chart of the chapter electromagnetic waves. So, continue your learnings from the NCERT 12th Physics Ch 8 Electromagnetic Waves Solutions PDF and get good subject knowledge.

Class 12
Subject Physics
Book Physics
Chapter Number 8
Chapter Name Electromagnetic Waves

NCERT Exercise Questions & Answers of 12th Class Physics Ch 8 Electromagnetic Waves

Preparing with these NCERT Questions will help you develop strong basics in the chapter Electromagnetic waves. To obtain all advantages of NCERT Solutions, try solving important questions of electromagnetic waves concept on your own and verify your answers by using class 12 physics NCERT Solutions chapter 8.

Question 1.
Figure shows a capacitor made of two circular plates each of radius 12 cm and separated by 5.0 cm. The capacitor is being charged by an external source (not shown in figure). The charging current is constant and equal to 0.15 A.
(a) Calculate the capacitance and the rate of change of potential difference between the plates.
(b) Obtain the displacement current across the plates.
(c) Is Kirchhoffs first rule valid at each plate of the capacitor ? Explain.
NCERT Solutions for Class 12 physics Chapter 8.21
Answer:
NCERT Solutions for Class 12 physics Chapter 8.22

(c) Yes. Because conduction current entering one plate is equal to the displacement current leaving that plate.

Question 2.
A parallel plate capacitor (shown in figure) made of circular plates each of radius R = 6.0 cm has a capacitance C = 100 pF. The capacitor is connected to a 230 V a.c. supply with a (angular) frequency of 300 rad s_1.
(a) What is the r .m.s. value of the conduction current?
(b) Is the conduction current equal to the displacement current ?
(c) Determine the amplitude of B at a point 3.0 cm from the axis between the plates.
NCERT Solutions for Class 12 physics Chapter 8.23
Answer:
tiwari academy class 12 physics Chapter 8.24NCERT Solutions for Class 12 physics Chapter 8.4NCERT Solutions for Class 12 physics Chapter 8.5

Question 3.
What physical quantity is the same for X-rays of g g wavelength 10-10 m, red light of wavelength 6800 A and radiowaves of wavelength 500 m ?
Answer:
All e.m. waves travel with same speed c = 3 x 108 m s-1 in vacuum.
Therefore, X-rays, red light and radiowaves have same speed.

Question 4.
A plane electromagnetic wave travels in vacuum along Z-direction. What can you say about the directions of its electric and magnetic field vectors ? If the frequency of the wave is 30 MHz, what is its wavelength ?
Answer:
The electric field vector E and magnetic field vectorB are in xy plane. They are normal to each other.
NCERT Solutions for Class 12 physics Chapter 8.6
Question 5.
A radio can tune into any station in the 7.5 MHz to 12 MHz band. What is the corresponding wavelength band ?
Answer:
tiwari academy class 12 physics Chapter 8.6

=> The corresponding wavelength band is 40 m to 25 m.

Question 6.
A charged particle oscillates about its mean equilibrium position with a frequency of 109 Hz. What is the frequency of the electromagnetic waves produced by the oscillator ?
Answer:
Frequency of the produced E.M. wave is same as the frequency of oscillating charged particles i. e. 109 Hz.

Question 7.
The amplitude of the magnetic field part of a harmonic electromagnetic wave in vacuum is B0 =510 nT. What is the electromagnetic waves produced by the oscillator?
Answer:
NCERT Solutions for Class 12 physics Chapter 8.8

Question 8.
Suppose that the electric field amplitude of an electromagnetic wave is E0 = 120 N/C and that its frequency is v = 50.0 MHz.
(a) Determine, B0, ω, k and λ.
(b) Find expressions for E and B.
Answer:
NCERT Solutions for Class 12 physics Chapter 8.9
tiwari academy class 12 physics Chapter 8.25

Question 9.
The terminology of different parts of the electromagnetic spectrum is given in the text. Use the formula E = hv (for energy of a quantum of radiation : photon) and obtain the photon energy in units of eV for different parts of the electromagnetic spectrum. In what way are the different scales of photon energies that you obtain related to the sources of electromagnetic radiation ?
Answer:
Using the relation for photon energy,
NCERT Solutions for Class 12 physics Chapter 8.26
NCERT Solutions for Class 12 physics Chapter 8.27
Conclusion.
 The above result indicates that the different wavelengths in the electromagnetic spectrum can be obtained by multiplying roughly the powers often.
The visible wavelengths are spaced by a few eV.
The nuclear energy levels (from y rays) are spaced about 1 MeV.

Question 10.
In plane electromagnetic wave, the electric field oscillates sinusoidally at a frequency of 2.0 x 1010 Hz and amplitude 48 Vm_1.
(a) What is the wavelength of the wave ?
(b) What is the amplitude of the oscillating magnetic field ?
(c) Show that the average energy density of the E field equals the average energy density of the B field. [c= 3 x 108 ms-1].
Answer:
NCERT Solutions for Class 12 physics Chapter 8.28NCERT Solutions for Class 12 physics Chapter 8.14

Question 11.
Suppose that the electric field part of an electromagnetic wave in vacuum is
E = {(3.1 N/C) cos[(1.8 rad/m)y + (5.4 x 106 rad/s)f]}i^.
(a) What is the direction of propagation ?
(b) What is the wavelength X ?
(c) What is the frequency v ?
(d) What is the amplitude of the magnetic field part of the wave ?
(e) Write an expression for the magnetic field part of the wave.
Answer:
tiwari academy class 12 physics Chapter 8.15

Question 12.
About 5% of the power of a 100 W light bulb is converted to visible radiation. What is the average intensity of visible radiation ?
(a) at a distance of 1 m from the bulb ?
(b) at a distance of 10 m ?
Assume that the radiation is emitted isotropically and neglect reflection.
Answer:
NCERT Solutions for Class 12 physics Chapter 8.16

Question 13.
Use the formula λ
mT = 029 cm K to obtain the characteristic temperature ranges for different parts of the electromagnetic spectrum. What do the numbers that you obtain tell you ?
Answer:
tiwari academy class 12 physics Chapter 8.17

These numbers tell us the range of temperature required to obtain the different parts of the spectrum. For example, to obtain a wavelength of 1 μm, a temperature of 2900 K is required.

Question 14.
Given below are some famous numbers associated with electromagnetic radiations in different contexts in physics. State the part of the electromagnetic spectrum to which each belongs.
(a) 21 cm (wavelength emitted by atomic hydrogen in interstellar space).
(b) 1057 MHz (frequency of radiation arising from two close energy levels in hydrogen; known as Lamb shift.)
(c) 2.7 K (temperature associated with the isotropic radiation filling all space-thought to be a relic of the ‘big-bang’ origin of the universe.)
(d) 5890 Å-5896 Å (double lines of sodium)
(e) 14.4 keV [energy of a particular transition in 57Fe nucleus associated with a famous high resolution spectroscopic method (Mossbauer spectroscopy).]
Answer:
(a) Given wavelength is of the order of 10-2 m i.e. short radio wave.
(b) Frequency is of the order of 109 Hz e. short radio wave.
(c)
NCERT Solutions for Class 12 physics Chapter 8.19

(d) Given wavelength is of order of 10-7 m i.e visible radiations(yellow light)

Question 15.
Answer the following questions
(a) Long distance radio broadcasts use shortwave bands. Why ?  (C.B.S.E. 2005)
(b) It is necessary to use satellites for long distance TV transmission.
Why? (C.B.S.E. 2005)
(c) Optical and radiotelescopes are build on the ground but X-ray astronomy is possible only from satellites orbiting the earth. Why ? (C.B.S.E. 2009)
(d) The small ozone layer on top of the stratosphere is crucial for human survival. Why ?(C.B.S.E. 2005, 2009)
(e) If the earth did not have an atmosphere, would its average surface temperature be higher or lower than what it is now ?
(f) Some scientists have predicted that a global nuclear war on the earth would be followed by a severe ‘nuclear winter’ with a devastating effect on life on earth. What might be the basis of this prediction ? (C.B.S.E. 1995)
Answer:
(a) Long distance radio broadcasts make use of sky waves. Ionosphere of earth’s atmosphere reflects the radiations of this range.
(b) For very long distance TV transmission, a very high frequency is required. Waves of this frequency just pass through the ionosphere and are not reflected back. Therefore, a satellite is required to reflect the signals to the earth.
(c) Atmosphere of earth can absorb X-rays but visible waves and radiowaves pass through it.
(d) Ozone layer absorbs ultraviolet (UV) radiations emitted by the sun and prevents them to reach the earth. Ultraviolet radiations are harmful for the life on earth.
(e) In this case, there will be no green house effect. So the earth will be at low temperature in the absence of atmosphere.
(f) In the case of worldwide nuclear war, the sky may get overcast with clouds of nuclear radiation. These clouds will stop the passage of sunlight to earth. Thus, earth will be as cool as in winter.

Every concept of chapter 8 covered in the NCERT Physics Solutions includes in-text questions and exercise questions. Read all theory questions and practice all numerical questions from chapter 8 electromagnetic waves NCERT Exercises of Class 12 Physics Pdf and learn the topic thoroughly. You can find these NCERT Physics Solutions of class 12 Ch 8 in both Hindi and English mediums.

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