Friday, August 1, 2014

CBSE Class 9 : Maths - CH 4.1 - Linear equations in two variables (NCERT Ex 4.1)

Linear Equations In Two Variables

Q1: The cost of a notebook is twice the cost of a pen. Write a linear equation in two variables to represent this statement.

(Take the cost of a notebook to be Rs x and that of a pen to be Rs y.)


Let the cost of a notebook and a pen be x and y respectively.

Cost of notebook = 2 ☓ Cost of pen

x = 2y

x − 2y = 0

Q2: Express the following linear equations in the form ax + by + c = 0 and indicate the values of a, b, c in each case:

(i) 2x + 3y = 9.35  

(ii) x - y/5 - 10 = 0
(iii) − 2x + 3 y = 6

(iv) x = 3y
(v) 2x = − 5y
(vi) 3x + 2 = 0

(vii) y − 2 = 0
(viii) 5 = 2x


Saturday, July 26, 2014

CBSE Class 10 - Science - Ch6 - Gist on Excretory System (Life Processes)

Gist on Excretory System
(Short Q & A)
A Pair Of Kidneys
(image credits: openclipart)

Q1: Define Excretion.

Answer: Excretion is a biological process by which an organism gets rid of metabolic toxic wastes from its body.

Q2: List the toxic wastes of metabolism.

Answer: These wastes are nitrogenous materials i.e. ammonia, urea and uric acid, carbon dioxide, inorganic salts, excess of water.

Q3: What is Osmoregulation? 

Answer: It is a process that maintains the amount of water and ionic balance in the body.

Q4: Where Urea is formed in mammals?

Answer: Urea is made in the liver via the ornithine cycle by combining the ammonia
made by deamination with carbon dioxide made from respiration

Q5: What are the major excretory products of plants?

Saturday, July 19, 2014

CBSE Class 11 - Computer Science - CH6 - Getting Started With C++ (Sumita Arora Textbook Solutions)

Getting Started With C++
(Sumita Arora) Textbook Solutions 7th Edn

CBSE Class 11 - Computer Science with C++ - Ch1 - Computer Overview (Sumita Arora) Textbook Solutions
Q1: What are tokens in C++? How many types of tokens allowed in C++? Exemplify your answer.

Answer: A token is the smallest unit of a c++ program that can be processed by a c++ compiler. These are also called lexical units or lexical elements. C++ has the following tokens:

  • Keywords: Reserved words which have special meaning or purpose. e.g. for, const, while, class, struct etc.
  • Identifiers: These are the names given to variables, constants, arrays, functions, classes or objects of a c++ program. Identifiers are case sensitive in c++. e.g. valid identifiers are: student, Date123, file234 etc.
  • Literals: Data Items that never change their value during program run. Also called constants. In C++ there are five types of literals i.e. bool literal, integer constants, character constants, floating constants and string literals. e.g. 1234, 'b', 3.14 etc.
  • Punctuators: These are tokens which have syntactic and semantic meaning to the compiler. e.g. {}, =, ++, -, %, *= etc.
  • Operators: These are the tokens that tell the c++ compiler to perform specific mathematical or logical manipulations. C++ is full of operators. e.g. Arithmetic operators(+,-,*,/,%), Shift operators(<<. >>), Bitwise operators(&, ^, |), logical operators(&&, ||) etc.

Wednesday, July 2, 2014




Q1: In this chapter you have read that health is a wider concept than illness. Look at this quote from the Constitution and explain the terms ‘living standard’ and ‘public health’ in your own words.

 An important part of the Constitution says it is the “duty of the State to raise the level of nutrition and the standard of living and to improve public health.”

Answer: Living Standard: is the environment, the atmosphere built across the surroundings of people
living in different regions.In well constructed urban areas standard of living is far better in
comparison to underdeveloped rural areas.Clean, pollution free surroundings lead to good living standards.
Whereas living in regions of dirty, poor sanitation, dusty lands leads to poor living standards.

Public Health: It is the wellness of all people, whether rich or poor, educated or uneducated, man or woman etc. to remain  healthy and free of any disease. Right to life is everyone's right without any discrimination. That is why it is named as "public" health and every individual can have the facilities given by the government in this respect.

Q2: What are the different ways through which the government can take steps to provide healthcare for all?Discuss.

Wednesday, June 18, 2014

CBSE Class 10 - English - Unseen Passage


Image Credits: openclipart

(From CBSE Examination Paper)

Q: Read the passage given below and answer the questions that follow: 

1. In the history of mankind,dance as an artistic form of expression is extremely old. Evidence of dance as a creative form is available in ancient library texts,paintings and sculpture from prehistoric times to the medieval period.

2. There are now seven classical dance styles - Bharatnatyam originated from Tamil Nadu, Kathakali from Kerala, Kuchipudi from Andhra Pradesh, Odissi from Orissa, Manipuri from Manipur, Kathak from Northern region and Satriya from Assam.

3. Most of these classical dances trace their roots to the grammar and techniques of movement codified in the Natya Shastra compiled by Bharat Muni,sometime between 2nd centuary BC and 2nd centuary AD.

4. Dance according to Bharat is classified into two main aspects: Nritta and Nritya. Nritta in the broadest sense is pure abstract dance which basically does not interpret or communicate any specific theme. It is the movement of limbs and body to the accompaniment of percussion instrument playing a specific rhythemic cycle of tala.

5.Nritya is the aspect of dance which is expressive and which communicates the meaning or theme of a song through gestures of hands(hastas), facial expressions and body movements.

6.Stylized interpretation when conveyed through body movements and facial and hand gestures is known as Angika Abhinaya,through words,as Vachika Abhinaya and through costumes and make up as Aharya Abhinaya.

Q1: How do we come to know that dance is a creative form of art?  

Friday, June 6, 2014

CBSE Class 10/11/12 - English Grammar - Comprehension Passage


(NDA 2014 General Ability Paper)
Directions: Read the following short passages. After each passage, you will find several questions based on what is stated or implied in the passages. Answer the questions that follow each passage.


In a free country, the man who reaches the position of leader is usually one of outstanding character and ability. Moreover, it is usually possible to foresee that he will reach such a position, since early in life one can see his qualities of character. But this is not always true in the case of a dictator; often he reaches his position of power through chance, very often through the unhappy state of his country. It is possible that Hitler would never have become the leader of Germany if that country had not been driven to despair.

Q1:  In a free country, one who becomes a leader
(a) must be of outstanding character and ability

(b) must show qualities of character from an early age 
(c) is generally of a remarkable character and ability 
(d) must see that his country is free from despair 

Saturday, May 24, 2014



Q1: Cereals largely fulfill which of the following energy requirement?

(a) Proteins
(b) Carbohydrates
(c) Fats
(d) Minerals

Q2(NCERT Exemplar): Which one is not a source of carbohydrate?

(a) Rice
(b) Millets
(c) Sorghum
(d) Gram

Q3: Which of the following is not included in 'organic farming'?

(a) compost and vermi-compost
(b) chemical fertilizers
(c) green manures
(d) crop rotation