Tribals, Dikus and the Vision of a Golden Age - NCERT Answers - CBSE Class 8 Social Studies (#cbsenotes)(#eduvictors)

Tribals, Dikus and the Vision of a Golden Age  

NCERT Answers 

Question 1: Fill in the blanks:
(a) The British described the tribal people as _____________.
(b) The method of sowing seeds in jhum cultivation is known as ____________.
(c) The tribal chiefs got _________titles in central India under the British land settlements.
(d) Tribals went to work in the ____________ of Assam, and the ___________ in Bihar.

Answer:
(a) The British described the tribal people as uncivilized.
(b) The method of sowing seeds in jhum cultivation is known as broadcasting or scattering.
(c) The tribal chiefs got land titles in central India under the British land settlements.
(d) Tribals went to work in the tea plantations of Assam and the coal mines in Bihar.

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

Pair of Linear Equations In Two Variables 

Solved Examples 

☛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)

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.

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) 

① Nelson Mandela swears in as the first black president of South Africa on 10th May 1994.

② The swearing-in ceremony took place in the lovely sandstone amphitheatre in Pretoria

③ 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.

④ He wished that freedom in Africa should reign.

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

Introduction to Trigonometry

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°

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

Pastoralists in the Modern World

(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.

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

Matter in our surroundings 

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.