CBSE NCERT Solutions of Class 9 Geography Chapter 6, Population | CBSE Guide NCERT Answers

Class 9, NCERT Geography - Contemporary India I

Chapter 6, POPULATION

NCERT Solutions, NCERT Answers of geography textbook exercise questions

Question 1: Choose the right answer from the four alternatives:
(i) Migrations change the number, distribution and composition of the population in -
(a) The area of departure
(b) The area of arrival
(c) Both the areas of departure and arrival
(d) None of the above
(ii) A large proportion of children in a population is a result of -
(a) high birth rates
(b) high life expectancies
(c) high death rates
(d) more married couples
(iii) The magnitude of population growth refers to -
(a) The total population of an area
(b) The number of persons added each year
(c) The rate at which the population increases
(d) The number of females power thousand males
(iv) According to the census 2001, a "literate" person is one who -
(a) can read and write his/her name
(b) can read and write any language
(c) is 7 years old and can read and write any language with understanding
(d) knows the 3 'R's (reading, writing, arithmetic)
Answer : (i) - c. (ii) - a. (iii) - b. (iv) - c.
Question 2: Answer the following questions briefly.
(i) Why is the rate of population growth in India declining since 1981?
(ii) Discuss the major components of population growth.
(iii) Define age structure, death rate and birth rate.
(iv) How is migration a detrimental factor of population change?
Answer (i): There are quite a few reasons because of which the rate of population growth in India has been declining since 1981. Some of the reasons are as follows:
(a) Family planning programmes, initiated by the government have been spreading awareness among the people about the benefits of delayed marriages for girls and also small family norm.
(b) Educational programmes have improved the literacy rate. This has helped more and more people to understand the benefits of a small family. Also population control measures taken by the Govt and several NGOs have been quite effective.
As a result of the above, birth rates declined rapidly since 1981 which caused a decline in the rate of population growth.
Answer (ii): The three major components of population growth are the following -
(a) Birth Rate
The greater the birth of children, the higher will be population growth. On the other hand, the lesser the birth of children, the lower will be population growth.
(b) Death Rate
The higher death rate will reduce the population growth but the lower death rate will add to the population growth.
(c) Migration
Migration is the movement of the people from one country to the other country. If this process of migration is within the country, it does not bring any change in the size of population. But migration to other countries does affect the size of population.
Answer (iii):
Age Structure
The age structure of a population refers to the number of people in the different age groups in a particular country. The population of a country is composed of children of 0-14 years, adults of 15-59 years, senior citizens aged 60 years and above. The children and senior citizens are not producers or earners as such they depend on the adults for their maintenance and hence they add to the dependency ratio.
Birth Rate and Death Rate
Birth Rate is the number of live births per thousand persons in a year whereas Death Rate means the deaths per thousand persons in a year. The difference between birth and death rate gives us the growth rate of population of any country in a year.
The widening gap between the birth and death rates is one of the main reasons for higher growth rate in India.
Answer (iv): Migration is a detrimental factor of population change, because -
(a) During migration people move from one region to another region. The change in population because of this movement can be internal as well as international.
(b) International migration changes the size of the population whereas internal migration does not change the size of the population but influences the distribution of the population within the nation.
(c) Migration also changes the composition of urban and rural population in terms of the age and sex ratios. In India the rural-urban migration has resulted in a steady increase in the percentage of population in cities and towns.
Thus, migration is a detrimental factor of population change as it affects the demographics of both the areas of departure and arrival.

Question 3: Distinguish between population growth and population change.    
Answer: Population is a dynamic phenomenon. Population Growth and Population Change can be distinguished as follows:
Population Growth
Growth of population refers to the increase in the number of inhabitants of a country or region during a specific period of time. Population growth can be expressed in two ways: (1) in terms of absolute numbers, (2) in terms of percentage.
The absolute number is the magnitude of increase which is obtained by simply subtracting the earlier population from the later population. In terms of percentage we express the rate of increase of population per annum which is also known as ‘annual growth rate’.
Natural increase and immigration are the major causes for population growth.
Population Change
Change in population refers to the change in distribution, composition or size of a population during a specific period of time. Some major causes of population change are - natural increase and migration (immigration, emigration). 


Cbse Ncert Solution of Class IX Geography Chapter 6, Population
Question 4: What is the relation between occupational structure and development?
Answer: The distribution of population according to the different types of occupation is referred to as ‘Occupational Structure’. Occupational Structure has a great impact on development. Occupations are generally divided into four categories - primary, secondary, tertiary and quaternary. Primary occupations include - agriculture, animal husbandry, fishing and forestry. Secondary occupations include - primarily manufacturing industries. Tertiary occupations include services like - doctors, teachers, etc. while quaternary occupations include the more intellectual occupations.
The proportion of people engaged in different activities reflects the economic development of a country. Developed nations have a high proportion of people in secondary and tertiary activities. Developing nations such as India, Sri Lanka etc. tend to have higher proportion of their workforce engaged in primary activities.      
Question 5: What are the advantages of having a healthy population?
Answer: There are several advantages of having a healthy population -
(i) Health is an important factor of population composition which boosts the development. A healthy person is much more efficient and productive and therefore, a healthy population is an asset for the nation.
(ii) Absenteeism is low and capability is high where workers are healthy.
(iii) Economic development of a country depends on the quality, ability and efficiency of its people. So, healthy population is the most important criterion for the prosperity and development of any country.          
To be continued ...

Sequences and Series - Class 11 Mathematics NCERT Solutions CBSE Guide for Chapter 9 Exercise 9.1 | Class XI Math NCERT Answers

CBSE Guide for Class 11 NCERT Mathematics NCERT Answers for Class XI CBSE Maths   

Chapter 9, Sequences and Series  
CBSE Guide, NCERT Solutions for Class 11 CBSE Mathematics Chapter 9 Exercise 9.1
Cbse Ncert Solution of Class 11 Ncert Math Chapter 9, Sequences and Series
Question 1: Write the first five terms of the sequences whose nth term is an= n(n + 2).  
Question 2: Write the first five terms of the sequences whose nth term is
https://www.cbsencertsolution.com image
Sequences and Series Exercise 9.1 | CBSE Mathematics - NCERT Answers | CBSE Guide NCERT Solutions
Question 3: Write the first five terms of the sequences whose nth term is an = 2n  
Question 4: Write the first five terms of the sequences whose nth term is
https://www.cbsencertsolution.com
Question 5:




CBSE Guide NCERT Solutions of Class XI Ncert Math Chapter 9, Sequences and Series
Question 6: Write the first five terms of the sequences whose nth term is  
https://www.cbsencertsolution.com/2018/10/sequences-and-series-class-11-mathematics-ncert-solutions-cbse-guide-for-Chapter-9-xi-math-ncert-answers.html
Question 7: Find the 17th term in the following sequence whose nth term is
https://www.cbsencertsolution.com
Question 8: Find the 7th term in the following sequence whose nth term is
https://www.cbsencertsolution.com/2018/10/sequences-and-series-class-11-mathematics-ncert-solutions-cbse-guide-for-Chapter-9-xi-math-ncert-answers.html
Question 9:
https://www.cbsencertsolution.com/2018/10/sequences-and-series-class-11-mathematics-ncert-solutions-cbse-guide-for-Chapter-9-xi-math-ncert-answers.html
 


Question 10: Find the 20th term in the following sequence whose nth term is
CBSE Guide NCERT Solution math image
View / Download Answers [pdf]


Cbse Ncert Answers of Class 11 CBSE Math Chapter 9, Sequences and Series
Question 11: Write the first five terms of the following sequence and obtain the corresponding series:
a1 = 3, an = 3an–1 + 2 for all n > 1
Question 12: Write the first five terms of the following sequence and obtain the corresponding series:
https:://www.cbsencertsolution.com
Question 13: Write the first five terms of the following sequence and obtain the corresponding series:
a1 = a2 = 2, an = an–1 – 1, n > 2

Question 14: 
https://www.cbsencertsolution.com/2018/10/sequences-and-series-class-11-mathematics-ncert-solutions-cbse-guide-for-Chapter-9-xi-math-ncert-answers.html

Relations and Functions - NCERT Solutions for CBSE Class 11 Mathematics Chapter 2 Exercise 2.2 | CBSE Math Guide


CBSE Guide for Class 11 NCERT Mathematics | NCERT Answers for Class XI CBSE Matrhs   

Chapter 2 - relations and functions

CBSE Guide, NCERT Solutions for Class 11 Mathematics Chapter 2 Exercise 2.2
(Cbse Ncert Solution of Class 11 Ncert Math Chapter 2, Relations and Functions)
Question 1: Let A = {1, 2, 3… 14}. Define a relation R from A to A by
R = {(x, y): 3x y = 0, where x, y A}. Write down its domain, codomain and range.  
Solution:
The relation R from A to A is given as -
R = {(x, y): 3x y = 0, where x, y ∈ A}
Or, R = {(x, y): 3x = y, where x, y ∈ A}
∴ R = {(1, 3), (2, 6), (3, 9), (4, 12)}
The domain of R is the set of all first elements of the ordered pairs in the relation.
∴ Domain of R = {1, 2, 3, 4}
The whole set A is the codomain of the relation R.
∴ Codomain of R = A = {1, 2, 3… 14}
So, the range of R is the set of all second elements of the ordered pairs in the relation.
Range of R = {3, 6, 9, 12}
Question 2: Define a relation R on the set N of natural numbers by R = {(x, y): y = x + 5, x is a natural number less than 4; x, y N}. Depict this relationship using roster form. Write down the domain and the range.  
Solution:
R = {(x, y): y = x + 5, x is a natural number less than 4, x, y N}
The natural numbers less than 4 are 1, 2, and 3.
R = {(1, 6), (2, 7), (3, 8)}
The domain of R is the set of all first elements of the ordered pairs in the relation.
Domain of R = {1, 2, 3}
The range of R is the set of all second elements of the ordered pairs in the relation. Range of R = {6, 7, 8}
Relations and Functions Exercise 2.2 | Class 11 Mathematics - Cbse Ncert Solution | CBSE Guide NCERT Answers
Question 3: A = {1, 2, 3, 5} and B = {4, 6, 9}. Define a relation R from A to B by R = {(x, y): the difference between x and y is odd; x A, y B}. Write R in roster form.     
Solution:
A = {1, 2, 3, 5} and B = {4, 6, 9}
R = {(x, y): the difference between x and y is odd; x A, y B}
R = {(1, 4), (1, 6), (2, 9), (3, 4), (3, 6), (5, 4), (5, 6)}
Question 4: The given figure shows a relationship between the sets P and Q. write this relation (i) in set-builder form (ii) in roster form. What is its domain and range?
  
Relations and Functions - NCERT Solutions for CBSE Class 11 Mathematics Chapter 2 Exercise 2.2 | CBSE Math Guide

Solution:
According to the given figure, P = {5, 6, 7}, Q = {3, 4, 5}
(i) R = {(x, y): y = x – 2; x P} or R = {(x, y): y = x – 2 for x = 5, 6, 7}
(ii) R = {(5, 3), (6, 4), (7, 5)}
Domain of R = {5, 6, 7}
Range of R = {3, 4, 5}
CBSE Guide NCERT Solutions of Class XI Ncert Math Chapter 2, Relations and Functions
Question 5: Let A = {1, 2, 3, 4, 6}.
Let R be the relation on A defined by {(a, b): a, b A, b is exactly divisible by a}.
(i) Write R in roster form
(ii) Find the domain of R
(iii) Find the range of R.
Solution:
A = {1, 2, 3, 4, 6}, R = {(a, b): a, b A, b is exactly divisible by a}
(i) R = {(1, 1), (1, 2), (1, 3), (1, 4), (1, 6), (2, 2), (2, 4), (2, 6), (3, 3), (3, 6), (4, 4), (6, 6)}
(ii) Domain of R = {1, 2, 3, 4, 6}
(iii) Range of R = {1, 2, 3, 4, 6}
Question 6: Determine the domain and range of the relation R defined by
R = {(x, x + 5): x {0, 1, 2, 3, 4, 5}}.
Solution:
R = {(x, x + 5): x {0, 1, 2, 3, 4, 5}}
R = {(0, 5), (1, 6), (2, 7), (3, 8), (4, 9), (5, 10)}
Domain of R = {0, 1, 2, 3, 4, 5}
Range of R = {5, 6, 7, 8, 9, 10}
Question 7: Write the relation R = {(x, x3): x is a prime number less than 10} in roster form.
Solution:
R = {(x, x3): x is a prime number less than 10}
By the given condition the prime numbers less than 10 are 2, 3, 5, and 7.
R = {(2, 8), (3, 27), (5, 125), (7, 343)}
Question 8: Let A = {x, y, z} and B = {1, 2}. Find the number of relations from A to B.
Solution:
It is given that A = {x, y, z} and B = {1, 2}.
A × B = {(x, 1), (x, 2), (y, 1), (y, 2), (z, 1), (z, 2)}
Since n(A × B) = 6, the number of subsets of A × B is 26.
Therefore, the number of relations from A to B is 26.  
Question 9: Let R be the relation on Z defined by R = {(a, b): a, b Z, a – b is an integer}. Find the domain and range of R.
Solution:
R = {(a, b): a, b Z, a – b is an integer}
It is known that the difference between any two integers is always an integer.
Domain of R = Z
Hence, Range of R = Z


Conic Sections - CBSE Class 11 Mathematics Chapter 11 NCERT Solutions | NCERT Answers of Class XI Maths Exercise 11.1

Solutions of Class 11 CBSE Mathematics | XIth Mathematics NCERT Answers  

Chapter 11 - conic sections
CBSE Guide, NCERT Solutions for Class 11 Mathematics Exercise 11.1
(Cbse Ncert Solution of Class XI Ncert Math Chapter 11, Conic Sections)
 To download answers [in pdf] scroll down and click on the LINK given at the end  
Question 1: Find the equation of the circle with centre (0, 2) and radius 2.  
Question 2: Find the equation of the circle with centre (–2, 3) and radius 4.
Question 3: Find the equation of the circle with centre (1/2, 1/4) and radius 1/12.
Question 4: Find the equation of the circle with centre (1, 1) and radius √2.
Question 5: Find the equation of the circle with centre (–a, –b) and radius ...

Conic Sections Exercise 11.1 | Class 11 Mathematics - Cbse Ncert Solution | CBSE Guide NCERT Answers
Question 6: Find the centre and radius of the circle (x + 5)2 + (y – 3)2 = 36
Question 7: Find the centre and radius of the circle x2 + y2 – 4x – 8y – 45 = 0
Question 8: Find the centre and radius of the circle x2 + y2 – 8x + 10y – 12 = 0     
Question 9: Find the centre and radius of the circle 2x2 + 2y2x = 0  
Question 10: Find the equation of the circle passing through the points (4, 1) and (6, 5) and whose centre is on the line 4x + y = 16.

Cbse Ncert Solution of Class XI Ncert Math Chapter 11, Conic Sections 
Question 11: Find the equation of the circle passing through the points (2, 3) and (–1, 1) and whose centre is on the line x – 3y – 11 = 0.  
Question 12: Find the equation of the circle with radius 5 whose centre lies on x-axis and passes through the point (2, 3).  

Conic Sections Exercise 11.1 | Class 11 Mathematics - Cbse Ncert Solution | CBSE Guide NCERT Answers
Question 13: Find the equation of the circle passing through (0, 0) and making intercepts a and b on the coordinate axes. 
Question 14: Find the equation of a circle with centre (2, 2) and passes through the point (4, 5).
Question 15: Does the point (–2.5, 3.5) lie inside, outside or on the circle x2 + y2 = 25?  

Google+