Our Country India - CBSE Class 6/9 - Geography - Assignment (#cbsenotes)(#eduvictors)

Our Country India 

Assignment Worksheet

Q1. Name southernmost point of Indian Mainland.

Q2. Where is Indira Point located?

Q3. Name the largest and smallest state of India.

Q4. What are the Seven Sisters?

Q5. Name the most populous state of India.

Is Matter Around Us Pure? - Worksheet - CBSE Class 9 Chemistry (#cbsenotes) (#eduvictors)

Is Matter Around Us Pure?

Worksheet

Fill in the blanks

1. Anything which has mass and occupies space is called ________.

2. Matter can be classified as ____ substances or mixtures

3. A/An _______ is a basic form of matter which cannot be broken down into simpler substances by any physical or chemical means.

4. _____ are one category of elements that have lustre, conduct heat and electricity and are sonorous.

5. ________ are elements having properties intermediate between those of metals and non-metals

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°