Wednesday, 8 August 2018

CBSE Class 10 - Pair of Linear Equations In Two Variables - Solved Examples (#cbsenotes)(#eduvictors)

Pair of Linear Equations In Two Variables 
Solved Examples 

CBSE Class 10 - Pair of Linear Equations In Two Variables - Solved Examples (#cbsenotes)(#eduvictors)

☛Following questions have been asked in previous years of CBSE board examination.

Q1: Solve the following system of linear equations by elimination method (equating the coefficients).
6 (ax + by) = 3a + 2b
6 (bx – ay) = 3b – 2a

Answer:

Given equations :
6 (ax + by) = 3a + 2b ...(1)
6 (bx – ay) = 3b – 2a ...(2)

multiply eqn. (1) by a and equation (2) by b, and add, we get

6a²x + 6aby = 3a² + 2ab
6b²x – 6aby = 3b² – 2ab
────────────────────────
6 (a² + b²)x = 3(a + b)
────────────────────────

⇒ x = ½

Put x = ½ in equation (1), we have

6a × ½ + 6by = 3a + 2b

6by = 2b
y = ⅓

∴ x = ½ and y = ⅓        (Answer)

Saturday, 4 August 2018

CBSE Class 9 - Maths - Introduction To Euclid's Geometry - Axioms, Theorem and Other terms (#cbsenotes)(#eduvictors)

Introduction To Euclid's Geometry - Axioms, Theorem and Other terms


(Note: Following list is compiled from a very old book 'Elements of Geometry by Ledegenre' and other NCERT textbooks)

Important terms to remember:

1. An axiom is a self-evident proposition (an assumption which is a self-evident truth).

2. A theorem is a truth, which becomes evident by means of a train of reasoning called a demonstration or proof. Theorems are proved, using axioms, previously proved statements and deductive reasoning.

3. A problem is a question proposed, which requires a solution.

4. A lemma is a subsidiary truth, employed for the demonstration/proof of a theorem, or the solution of a problem.

Friday, 3 August 2018

CBSE Class 10 - English Lit. - First Flight - Chapter 4 - Long Walk to Freedom (Key Points) (#cbsenotes)(#eduvictors)

Chapter 2 - Long Walk to Freedom 

(Key Points) 

CBSE Class 10 - English Lit. - First Flight - Chapter 4 - Long Walk to Freedom (Key Points) (#cbsenotes)(#eduvictors)


Nelson Mandela swears in as the first black president of South Africa on 10th May 1994.

The swearing-in ceremony took place in the lovely sandstone amphitheatre in Pretoria

He addressed the rainbow gathering with a zest telling that never, never, and never again should it be that that beautiful land would experience the oppression of one by another.

He wished that freedom in Africa should reign.

Monday, 30 July 2018

CBSE Class 10 - Maths - Introduction to Trigonometry - Short Q and A (#cbsenotes)(#eduvictors)

Introduction to Trigonometry

CBSE Class 10 - Maths - Introduction to Trigonometry - Short Q and A (#cbsenotes)(#eduvictors)

Short Q and A 

Q1: If sin 3A = cos (A – 26°), where 3A is an acute angle, find the value of A.

Answer: sin 3A = cos (A – 26°)

∵ sin 3A = cos (90° – 3A)
∴ cos (90° – 3A) = cos (A – 26°)

Since
90° – 3A and A – 26° are both acute angles, therefore,
90° – 3A = A – 26°
A = 29°

Q2: Express cot 85° + cos 75° in terms of trigonometric ratios of angles between 0° and 45°.

Answer: cot 85° + cos 75° = cot (90° – 5°) + cos (90° – 15°)

= tan 5° + sin 15°


Saturday, 28 July 2018

CBSE Class 9 - India and the Contemporary World – Chapter 5 - Pastoralists in the Modern World ( NCERT Answers) (#cbsenotes)(#eduvictors)

Pastoralists in the Modern World

CBSE Class 9 - India and the Contemporary World – Chapter 5 - Pastoralists in the Modern World ( NCERT Answers) (#cbsenotes)(#eduvictors)

(NCERT Solutions)

Q1: Explain why nomadic tribes need to move from one place to another. What are the advantages to the environment of this continuous movement?

Answer:  There were many need of nomadic tribes to move from one place to another:

① The nomadic tribes had no regular fields of their own from where they could get fodder for their cattle.

② They lived with their herd in the low hills of the Himalayas from September to April because; the huge mountains or high altitudes were covered with snow during this period. In these areas, the dry scrub forests provided pastures for their herds during this period.

③ With the onset of summer, as the snow melted and the hillsides began to be covered with lush green with a variety of new grasses, the pastoralists started their northward march for their summer grazing grounds.

④ Again with the onset of winter when the mountains began to be covered with snow and there was a dearth of nutritious forage, these pastoralists on the move again, this time on their downward journey.

The movement of the nomadic pastoralists from the downward to the upward areas and vice-versa allowed sufficient time for natural restoration of vegetation grounds. Their continuous shifting provided sufficient forage to the different animals both at the high mountains and the lower hills. They also helped in maintaining the quality of the pastures.


Friday, 27 July 2018

CBSE Class 9 - Chemistry - Matter in our surroundings - Revision Assignment (#cbsenotes)(#eduvictors)

Matter in our surroundings 

CBSE Class 9 - Chemistry - Matter in our surroundings - Revision Assignment (#cbsenotes)(#eduvictors)

Revision Assignment


Q1. What is the physical nature of matter?

Q2. What are the characteristics of particles of matter?

Q3. Why do the particles mix faster in gases than in solids or liquids?

Q4. Why can you smell an incense stick in the whole room even if it is lit in one place?

Q5. Comment on the properties of matter in tabulated form keeping in mind the rigidity,  compressibility, kinetic energy,  fluidity and density.


Wednesday, 25 July 2018

NCERT Class 8 - Science - Chapter: Force and Pressure (Worksheet) (#cbsenotes)(#eduvictors)

Force and Pressure 

Class 8 - Science
(Worksheet)

NCERT Class 8 - Science - Chapter: Force and Pressure (Worksheet) (#cbsenotes)(#eduvictors)


Fill in the blanks

1. Muscular force is an example of _______ force.

2. Oil is applied to machines to reduce _______ force.

3. S.I unit of pressure is ____________.

4. S.I. unit of force is _____________.

5. If the area of contact is increased, then pressure ______ _.

6. Pressure in solid depends upon ________________ and ____________.

Sunday, 22 July 2018

CBSE Class 7 - Social Science - Political Science - CH3: How the State Government Works (NCERT Q and A) (#cbsenotes)(#eduvictors)

How the State Government Works

VII Social Science
Political Science Chapter 03
NCERT Solutions

CBSE Class 7 - Social Science - Political Science - CH3: How the State Government Works (NCERT Q and A) (#cbsenotes)(#eduvictors)

Question 1. Use the terms ‘constituency’ and ‘represent’ to explain who an MLA and how is the person elected?

Answer:
Every state in India has a Legislative Assembly and each state is divided into different areas or constituencies. From each constituency, the people elect one representative who then becomes a Member of the Legislative Assembly (MLA). Each MLA belongs to a particular political party. MLAs are elected by the people and form the government, hence, they represent the people.

Tuesday, 17 July 2018

CBSE Class 12 - Economics - Value Based Questions and Answers on Macro Economics (#cbsenotes)(#eduvictors)

Value Based Questions and Answers on Macro Economics

CBSE Class 12 - Economics - Value Based Questions and Answers on Macro Economics (#cbsenotes)(#eduvictors)

Very Short Questions and Answers (VSQA)


Q1:  Ms. Nidhi is interested in knowing the change in quantity produced by a farmer with a fall in the price of the product. Which branch of economics would she study to ascertain the change?

Answer: Micro Economics

Q2: Give an example to show that an item which is kept constant in micro economics is considered a variable in macro economics.

Answer:  National Income is kept constant in micro economics, but in macro economics, it is considered as an important variable.


Q3: What is the rationale for not taking into account the value of   intermediate goods in the measure of Gross Domestic Product?

Answer:  To avoid the problem of double counting.


Monday, 16 July 2018

Class 6/7/8/9/10 Entrance Tests/NTSE/CTET/NDA - General Science Quiz (2018) (#eduvictors)

General Science Quiz 

Class 6/7/8/9/10 Entrance Tests/NTSE/CTET/NDA - General Science Quiz (2018) (#eduvictors)

Q1: Which of the following is not example bio-mass energy source?

(a) Wood
(b) Gobar gas
(c) Atomic energy
(d) Coal


Q2: The scientific study of earthquakes is known as 

(a) Seismology
(b) Cosmology
(c) Ecology
(d) Pathology


Q3: Which of the following is a plant hormone?

(a) Insulin
(b) Thyroxin
(c) Estrogen
(d) Cytokinin