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class 12 books

2020-07-18T08:01:00.001+05:30

1 history

history - amazon

2 pol sc

pol science - amazon

3 phycology

psychology - amazon

Class 10: Physics Chapter 12: Electricity Handwritten NCERT Answers (Handwritten Answers PDF Included)

2020-06-08T15:04:00.002+05:30

Class 10: Physics Chapter 12: Electricity Handwritten NCERT Answers (Handwritten Answers PDF Included)

Click Here to Download Class 10: Physics Chapter 12: Electricity Handwritten NCERT Answers PDF

Class 10: Economics Chapter 1 Development Handwritten Notes (Handwritten Notes PDF Included)

2020-06-05T16:26:00.004+05:30

Click Here to download Class 10: Economics Chapter 1 Development Handwritten Notes

Class 10 Economics Chapter 1 Development: Notes (PDF Notes and Handwritten Notes Included)

2020-06-02T14:51:00.001+05:30

Class 10 Economics Chapter 1 Development: Notes (PDF Notes and Handwritten Notes Included)

Click Here to Download Class 10 Economics Chapter 1 Development: PDF Notes

Click Here to Download Class 10 Economics Chapter 1 Development: Handwritten Notes

Chapter 1: Development: Notes

Overview:

1) Characteristics of Development:

a)Different People Different Goals:

Different People can have Different goals

For Example:

Development Goal for Landless Rural labourer would be better wages, more days of work, better education for their children, and no social Discrimination

Whereas

Development goal for a girl from a rich Family would be more freedom or as much freedom as her brother, and to pursue her education abroad.

b) What may be development for one may not be Development for the other , it can even be destructive.

For Example

To get more electricity Industrialists may want to build more dams,

But this may submerge the land under water and people living there have to be displaced (such as Tribal People)

Therefore building dams may be development for the industrialists but it is not development for the people living there, rather it is destructive for them

c) Income and other Goals:

For development, people look at a mix of goals

For Example

Beside more income, people also seek things like equal treatment, freedom, security, no discrimination and respect of others.

2) National Development:

We know that what may be development for one may not be development for other We know that what may be development for one may not be development for other

It is very important that to keep in mind that different people could have different as well as conflicting notions of a country’s development.

3) Comparisons:

a)Countries:

For comparing countries, their income is considered to be one of the most important attributes.

This is based on the understanding that more income means more of all things that human beings need

Income of the Country: is the income of all residents of the country

But

For comparison, total income is not a useful measure, because, different countries have different population, therefor e the total income of the country would not tell us what an average person is likely to earn.

Hence, we compare countries with the average income

Average income: is the total income of the country divided by its population

It is also known as the per capita income

Reports:

World Development Repot – World Bank

Countries with per capita income of US$ 12,056 per annum and above are called rich countries.

· Countries with per capita income of US$955 or less are called low-income/poor countries.

· India comes in low-middle Income Countries with per capita income of US$1820 per annum.

· The rich countries, excluding countries of middle-east and certain other small countries are generally called Developed Countries.

· Problem with comparing countries using Average Income:

They hide disparities

While average income is a useful for comparison, it does not tell us how the income is distributed among the people of the country.

Human Development Report – UNDP(United Nations Development Program)

Compares countries on the basis on education levels of the people, their health status and per capita income

The Human Development Index (HDI) Rank of India in the world (2018) was 130 out of 189 countries.

India’s Gross National Income was US$6353 and life expectancy was 68.8 years.

2) States:

Data Analysis:

IMR: Infant Mortality Rate: indicates the number of children that die before the age of one year as a proportion of 1000 live births in that particular year.

Net attendance Ratio: total number of children of age group 14 and 15 years attending school as a percentage of total number of children in the same age group.

Conclusion:

(1) Table’s first column shows that the per capita income of Haryana is greater than that of Kerala but the Infant Mortality rate in Haryana is more than three times than that of Kerala.

(2) The last column shows the net-attendance ratio. Around half of the children aged 14 – 15 in Bihar are not attending the school beyond 8.

Public Facilities:

Money in your pocket cannot buy all the good and services that you may need to live well.

For Example: Money cannot buy pollution-free environment or it cannot protect you from infectious diseases.

The best and the cheapest way to provide the good and services, is to provide them collectively

For Example: Instead of having a security guard for each house, the community can have 1 – 3 Security guards for the whole community. That would be best and the cheapest way to provide security

· In many areas, children, particularly girls, are not able to go to high school because the government/ community have not provided adequate facilities.

· Kerala does not have a lot of Infant Mortality Rate because it has adequate provision of basic health and education facilities.

· Some state also have well-functioned PDS (Public Distribution System). Health and Nutrition status of the people of these states is certainly likely to be better.

BMI: Body Mass Index: is an index by which we can find out if the body is nourished or not.

Formula = Weight (kg)/height (m)²

Normal range of age 14 Boys BMI is 15.5 – 25.9

Normal range of Age 14 Girls BMI is 15.4 – 27.3

4) Sustainable Development:

1) Groundwater in India:

· Overused in many parts of the country

· Groundwater had declined about 4 meters in 300 districts in past 20 years

· One- third of the country is overusing their Groundwater

· It is overused particularly in the agriculturally prosperous areas of Punjab and Western UP, Central and some parts of South India, and rapidly growing Urban areas

2) Exhaustion of Natural Resources:

· Research says that the crude oil reserve would last only next 50 years.

· India depends on importing oil from abroad because they do not have enough stocks.

Renewable Resources:

Resources that can be replenished by the nature. For Example: Groundwater, Sunlight, etc.

Non-Renewable Resources:

Resources which will get exhausted after years of use, For Example – Crude Oil, Petroleum, etc.

Class 10 Maths Chapter 1: Real Numbers Chapter Practice Problems(with Questions PDF and Step by Step Handwritten Solutions)CPP

2020-05-30T14:12:00.000+05:30

Class 10 Maths Chapter 1: Real Numbers Chapter Practice Problems(with Questions PDF and Step by Step Handwritten Solutions)CPP

Click Here to download Class 10 Maths Chapter 1: Real Numbers Chapter Practice Problems with answers

Click Here to download Class 10 Maths Chapter 1: Real Numbers Chapter Practice Problems step-by-step handwritten answers

Questions:

1) If the HCF of 408 and 1032 is expressible in the form 1032m-408*5.Find m.

2) Find the largest number which exactly divides 280 and 1245 and leaves remainders of 4 and 3

3) Prove that if x and y are odd positive integers, then x²+y² is even but not divisible by 4.

4) Prove that there is no natural number for which 4ⁿ ends with the digit zero.

5) Prove that 21/2 + 31/2 is irrational.

6) If a,b,c and d are four positive real numbers such that abcd=1,what is the minimum value of(1+a)(1+b)(1+c)(1+d).

7) Find the last digit of the sum 1+2+...+49.

8) Find the rightmost non-zero digit of the number(30)²⁷²⁰

9) How many numbers up to 100 are co-prime to 19?

10) Find the remainder when 43³³-23³³ is divided by 5.

11) How many composite numbers from 71 to 76 have the same number of divisors?

Answers:

1) 2 10)0

2) 138 11) 2

6) 16

7) 5

8) 1

9)95

You can find step – step handwritten solution of this CPP in the blog itself. J

Class 9: FIITJEE Big Bang Edge Test Question Paper Class 9 2019 Download Paper with answers(PDF)

2020-05-29T19:06:00.001+05:30

Class 9: FIITJEE Big Bang Edge Test Question Paper Class 9 2019 Download Paper with answers(PDF)

FIITJEE Big Bang Edge Test Question Paper 2019: FIITJEE has conducted the FIITJEE Talent Recognition Exam and Big Bang Edge Test on 20th October 2019. The FIITJEE FTRE and Big Bang Edge Test has been conducted at various exam centers all over India. Those candidates who have appeared in FIITJEE FTRE and Big Bang Edge Test 2019 can check the answer key and solution of test from this page. The official answer key of FIITJEE FTRE and Big Bang Edge Test will be released after 1 week of exam however team bsebportal.com has released the answer key of FIITJEE FTRE and Big Bang Edge Test 2019 on 20th October 2019. Candidates can check and download FIITJEE FTRE and Big Bang Edge Test Question Paper and solution from the link given below.

Click Here to Download Class 10: FIITJEE Big Bang Edge Test Question Paper Class 10 2019 Download Paper with answers(PDF)

About FIITJEE Big Bang Edge Test

In case you are aspiring for IIT, IISc, NIT & other Top Engineering Colleges in India or aiming for success in NTSE, X / XII Boards, KVPY, Sr. Olympiads & Jr. Science Olympiad, Big Bang Edge Test can put you on path to achieving what you set out to achieve through FIITJEE’s Iconic Coaching Programs that prepare you for all Scholastic & Competitive exams relevant to your Class based on your potential, present capabilities, motivation & commitment to work hard.

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Class 10: FIITJEE Big Bang Edge Test Question Paper Class 10 2019 Download Paper with answers(PDF)

2020-05-29T18:36:00.001+05:30

Class 10: FIITJEE Big Bang Edge Test Question Paper Class 10 2019 Download Paper with answers(PDF)

Click Here to Download Class 10: FIITJEE Big Bang Edge Test Question Paper Class 10 2019 Download Paper with answers(PDF)

About FIITJEE Big Bang Edge Test

If you faced any problem do contact me

I'll be happy to help :)

Class 10 Maths Chapter 1: Real Numbers Extra Questions(with Questions PDF and Step by Step Handwritten Solutions)

2020-05-28T14:15:00.002+05:30

Chapter 1) Real Numbers

Click Here to download extra questions PDF

Click Here to download Step by Step Handwritten Answers

Extra Questions with solutions

Q1) Obtain HCF of 12056 and 420.

Q2) Show that any positive integer is of the form of 8q +1, 8q+3 or 8q+7, where q is some integer.

Q3) Show that cube of any positive integer is of the form of 9m, 9m+1 or 9m+8.

Q4) Use Euclid’s division algorithm to find HCF of 460 and 20468.

Q5) Show that n² -1 is divisible by 8, if n is an odd positive integer.

Q6) Consider the numbers of the form 3ⁿ (where n is a natural number). Check whether there is any value of n for which 3ⁿ ends with 2.

Q7) Find the HCF and LCM of 35 and 115 by prime factorisation method.

Q8) Find HCF of 315 and 462 and hence find their LCM.

Q9) Find HCF and LCM of the following pairs of numbers:

a) 98 and 70:

b) 112 and 64:

Q10) There are 3 alarms A, B, and C. A rings after every 3hrs, B rings after every 4hrs and C rings after every 6hrs. Find the time interval after which the 3 alarms ring together after ringing once together.

Q11) Find the largest number that will divide 398, 436 and 542 leaving remainder 7, 11 and 15 respectively.

Q12) Which of the following rational numbers can be represented as terminating decimals?

a) 3/5

b) 2/13

c) 7/20

Q13) Find HCF of 3675 and 43 using Euclid’s division algorithm.

Q14) Using Euclid’s division lemma, prove that difference of squares of 2 odd natural numbers is a multiple of 8.

Q15) Check whether 7ⁿ can end with the digit ‘0’ for any natural number n.

Q16) Given that HCF (189,144) = 9, find their LCM.

Q17) If a is an irrational number, them prove that -a is also a irrational number.

Q18) Prove that 2 + 21/2 is not a rational number.

Q19) Without performing the long division process state whether the following rational numbers will have terminating decimal expansion or a non-terminating decimal expansion .

a) 17/8 b) 64/455 c) 29/343 d)15/1600 e)13/3125 f)23/2³5³

Q20) Prove that 51/2 + 31/2 is an irrational number.

Answers:

Q1) 4

Q4) 4

Q7) HCF = 5, LCM = 805

Q8) HCF = 21, LCM = 6930

Q9) a) HCF = 14, LCM = 490 b)HCF = 16, LCM = 448

Q10) 12hrs

Q11) 17

Q12) a) Terminating b)Non-Terminating c)Terminating

Q13) HCF = 21

Q15) no

Q16) 3024

Q19) a)Terminating b)Non-Terminating c)Non-Terminating d)Terminating e)Terminating

f)Terminating

To find handwritten step by step solution you can download handwritten_solution.pdf from the blog itself J

Class 10 NCERT Physics Chapter 11: Electricity : Handwritten Notes

2020-05-26T13:34:00.008+05:30

Chapter 12: ELECTRICITY

Handwritten Notes

Click Here to download Chapter 12: Electricity Handwritten Notes PDF

Class 10 NCERT Physics Chapter 11: Electricity : Notes (NCERT Notes PDF Included)

2020-05-25T14:34:00.004+05:30

Chapter 12: ELECTRICITY

NOTES

Click Here to download Chapter 12: Electricity Notes PDF

Overview

Basic Knowledge

1.1) Electric Current:

Rate of flow of charge through current carrying conductor is known as Electric Current

Electric Current is expressed by the amount of charge flowing through a particular area per unit time

Direction of Electric Current:

It is taken opposite to the direction of the flow of electrons (negatively charged particles).

It is not taken as the direction of the motion of the electrons because electric current was discovered before the discovery of the electrons, so scientists assumed that electric current constitute positively charged particles (whose direction is opposite than that of the electrons). This direction was taken and was worldwide accepted, but after the discovery of electrons, scientists did not modify the direction of and that idea was carried on

Formula:

Rate of flow of electrons is known as electric current.

I=Q/T

Where I is electric current, Q is Electric Charge and T is Time.

SI Units:

SI Unit of electric current is Ampere (A).

1 Ampere of charge is constituted of flow of 1 coulomb of charge per second.

Named after French scientist, Andre-Marie Ampere

1 Ampere = 1000 milliampere (mA)

1 milliampere = 1000 microampere(µA)

SI Unit of Electric Charge is Coulomb (C)

1 Coulomb of charge contains nearly 6 * 10¹⁸ electrons

Measuring Device:

Electric Current is measured by a device known as Ammeter.

Connection: It is connected in series in an electric circuit

Series Connection is an end to end connection.

Class 10 NCERT Physics Chapter 14: Sources of Energy : Answers (NCERT Answers PDF and Handwritten Answers Included)

2020-05-24T13:45:00.000+05:30

Chapter 14: sources of energy

Click Here to download Chapter 14: Sources of Energy Answers PDF

Exercise and in-text question answers

In-text question set 1 (page number 243)

Question 1) what is a good source of energy?
Answer) a good source of energy would be one:
     1) which would do a large amount of work per unit time
     2) be easily accessible
     3) be easy to store and transport
     4) which is economical

Question 2) what is a good fuel?
Answer) a good fuel would be one:
     1) which would produce large amount of heat on burning
     2) which does not produce a lot of smoke
     3) and which is easily available

Question 3) If you could use any source of energy for heating your food, which one would you use and why?
Answer) I would prefer LPG over other sources of energy for heating as it:
     1) produce large amount of heat on burning
     2) produces no smoke
     3) it is easily available and is economical

In-text question set 3 (page number 253)

Question 1) what kind of mirror - concave, convex or plain - would be best suited for use in a solar cooker? Why?
Answer) A concave mirror would be best suited for used in solar cooker. This is because concave mirror converges light rays (here, sunlight) to a smaller area, the convergence of Sunlight would increase the temperature faster and hence would cook the food faster, as compared to plane or convex mirror.

Question 2) what are the limitations of the energy that can be obtained from the oceans?
Answer) the limitations of the energy that can be obtained from the oceans are -
1) the locations (for tidal energy) and strong waves (for wave energy) are limited to a specific area.
2) the efficient commercial exploitation is difficult (that is - it is costly to extract these sources of energy)

Question 3) what is geothermal energy?
Answer) geothermal Energy is a form of heat energy which is formed from molten rocks. With due time and geological changes, molten rocks were formed in the deeper and hot regions of Earth's Crust and post up words and trapped in certain regions called ' hot spots'.
This heat energy is used to generate steam which is used to rotate electric generator

Question 4) what are the advantages of nuclear energy?
Answer) the advantages of nuclear energy are -
1) nuclear energy releases a tremendous amount of energy. For example - fission of one atom of Uranium releases 10 million times the energy produced by the combustion of 1 atom of carbon
2) if a nuclear reactor is design for electric power generation, such nuclear 'fuel' can be part of a self-sustaining fission Chain Reaction that releases energy at a controlled level. This released energy can be used for producing steam which can be converted into

In-text question 4 (page number 253 b)

Question 1)Can any source of energy be pollution free? Why or why not?
Answer) no, any source of energy can't be pollution free. Any source of energy disturbs the environment in some way or the other. When we talk of 'clean' fuel like CNG, it would be more exact to say that the particular fuel is cleaner than the other
In some cases the actual operation of the device may seem to be pollution free (like solar panels or wind mills) but the Assembly of the device would have cost some environmental damage
For example - solar panels is made up of silicon, silicon has to be mined, refined and then it is extracted. The process of Mining or refining is not at all pollution free.

Question 2) hydrogen has been used as a rocket fuel. Would you consider it a cleaner fuel than CNG? Why or why not?
Answer is yet to be found and written SRY For Delay

In-text question 5 (page number 254)
Question 1) Give two energy sources that you would consider to be renewable. Give Reasons for your choices.
Answer) two energy sources which are renewable are wind energy (which are extracted from wind mills) and solar energy (which are extracted from solar panels). This is because the sources such as wind and sun can be replenishable.

Questions 2) Give the names of two energy sources that you would consider to be exhaustible. Give reasons for your choices.
Answer) two energy sources which are exhaustible are coal and petroleum. This is because they are not replenishable, takes millions of years to form and those conditions under which coal and petroleum are formed can't be made in Laboratories.