CBSE Class 8 - Science - Chapter 18 - Pollution of Air and Water (Worksheet)(#eduvictors)(#class8Science)

Pollution of Air and Water (Worksheet)

CBSE Class 8 - Science - Chapter 18

All organisms including plants, animals (including human beings) and micro-organisms live in a habitat and interact with the ecosystem. Both biotic and abiotic components constitute environment. A harmful change in environment due to pollution cause discomfort and affect the lives of living beings.

Fill in the blanks

1. Substances that cause harmful changes in the air, soil or water are called ___________.


2. Incomplete burning of fossil fuels, like petrol and diesel, results in the production of colourless, odourless and toxic gas called ______________.


3. ________ is a mix, in the air, of smoke and chemicals with fog.


4. CFCs contribute to the depletion of the ________ layer that protects us from the harmful ultraviolet rays of the sun.

CBSE Class 11 Maths Chapter Sets - NCERT Exercise 1.4 (Q 9 - Q 12) (#eduvictors)(#class11Maths)

Class 11  Maths Chapter Sets - NCERT Exercise 1.4 (Q 9 - Q 12)

NCERT Solutions

Q9: If A = {3, 6, 9, 12, 15, 18, 21}, 
  B = { 4, 8, 12, 16, 20 },
C = { 2, 4, 6, 8, 10, 12, 14, 16 }, 
D = {5, 10, 15, 20 }; 
find
(i) A – B 
(ii) A – C 
(iii) A – D 
(iv) B – A
(v) C – A 
(vi) D – A 
(vii) B – C 
(viii) B – D
(ix) C – B 
(x) D – B 
(xi) C – D 
(xii) D – C


Answer: 
(i) A – B    = {3, 6, 9, 15, 18, 21}

(ii) A – C  = {3, 9, 15, 18, 21}

(iii) A – D = {3, 6, 9, 12, 18, 21}

(iv) B – A  = {4, 8, 16, 20}

(v) C – A  = {2,4,8,10,14,16}

(vi) D – A = {5,10,20}

(vii) B – C = {20}

(viii) B – D = {4,8,12,16}

(ix) C – B = {2,6,10,14}

(x) D – B  = {5,10,15}

(xi) C – D = {2,4,6,8,12,14,16}

(xii) D – C = {5,15,20}

CBSE Class 8 - Maths - ALGEBRAIC EXPRESSIONS, IDENTITIES AND FACTORISATION (MCQs) (#class8Maths)(#cbsenotes)(#eduvictors)

ALGEBRAIC EXPRESSIONS, IDENTITIES AND FACTORISATION 

(MCQs)

CBSE Class 8 - Maths

Q1: Which is the like term as 24a²bc?

(a) 13 × 8a × 2b × c × a 

(b) 8 × 3 × a × b × c

(c) 3 × 8 × a × b × c × c 

(d) 3 × 8 × a × b × b × c

CBSE Class 9 Maths - Coordinate Geometry - Concept Points (#class9Maths)(#eduvictors)

Coordinate Geometry - Concept PointsClass 9 Maths

1. The system used for describing the position of a point in a plane is called Cartesian system.

2. To locate the position of a point in a plane, we require two perpendicular lines.

3. The plane is called the Cartesian or coordinate plane and the lines are called the coordinate axes.

English Vocabulary - Commonly Confused Words (Part-4)(#eduvictors)(#englishvocabulary)

Commonly Confused Words 

(Part-4)

English Vocabulary 

English is full of phrases or words, which sound the same or comparable yet have distinctive meanings and are sometimes confusing too. Here is the third list of commonly confused words.

Bad, Badly
Bad means poor quality is used as an adjective after verbs like am, feel, is,
    Badly means unsatisfactory, inadequate and is used as an adverb.

CBSE Class 11 Maths - Laws of Set Operations (#class11Maths)(#eduvictors)

Laws of Set Operations Class 11 Maths - Sets

Sets under the operations of union, intersection and complement satisfy various laws. These laws collectively called Algebra of sets.

Here follows few important Laws of Set Operations

1. Idempotent Laws:

(a) A ∪ A = A 

(b) A ∩ A = A

CBSE Class 10 English - Cloze Test (Part 2) - Fill in the Blanks (New Pattern 2019-2020)(#class10English)(#eduvictors)

Class 10 English - Cloze Test (Part 2) 

Fill in the Blanks 

(New Pattern 2019-2020)

A Cloze Test or Cloze Reading Test is an exercise where the candidates are provided with a passage which has certain words missing from it. It follows logically that to ace such an assessment, you must have a strong command over English Language,  Grammar and Good Vocabulary. More importantly, it is important to understand the flow and context of the passage. Keep reading to know the tips that will help you to solve questions based on Cloze Test.



Directions : In Question Nos. 1 to 10, in the following passage some of the words have been left out. Read the passage carefully and choose the correct answer to each question out of the four alternatives and fill in the blanks.

CBSE Class 11 Maths Chapter Sets - NCERT Exercise 1.4 (Q 6 - Q 8) (#eduvictors)(#class11)

Class 11  Maths Chapter Sets - NCERT Exercise 1.4 (Q 6 - Q 8)

NCERT Solutions

Q6: If A = { 3, 5, 7, 9, 11 }, B = {7, 9, 11, 13}, C = {11, 13, 15} and D = {15, 17}; find
(i) A ∩ B 
(ii) B ∩ C 
(iii) A ∩ C ∩ D
(iv) A ∩ C 
(v) B ∩ D 
(vi) A ∩ (B ∪ C)
(vii) A ∩ D 
(viii) A ∩ (B ∪ D) 
(ix) ( A ∩ B ) ∩ ( B ∪ C )
(x) ( A ∪ D) ∩ ( B ∪ C)

Answer:
(i) A ∩ B  = {7,9,11}

(ii) B ∩ C = {11, 13}

(iii) A ∩ C ∩ D = {A ∩ C} ∩ D  = {11} ∩ {15, 17} = φ

(iv) A ∩ C = {11}

(v) B ∩ D = {7, 9, 11, 13}  ∩ {15, 17} = φ

(vi) A ∩ (B ∪ C)
= {3, 5, 7, 9, 11}  ∩ ({7, 9, 11, 13} ∪ {11, 13, 15})
= {3, 5, 7, 9, 11}  ∩ {7, 9, 11, 13, 15}
= {7, 9, 11}

(vii) A ∩ D = φ

(viii) A ∩ (B ∪ D)
= {3, 5, 7, 9, 11}  ∩ ({7, 9, 11, 13} ∪ {15, 17})
= {3, 5, 7, 9, 11}  ∩ {7, 9, 11, 13, 15, 17}
= {7, 9, 11}

CBSE Class 9 Geography - Drainage (MCQSs) (#eduvictors)(#class9Geography)

Drainage (MCQs)

Class 9 - Geography

NTSE/CTET/Competitions - General Knowledge - Environmental Institutes (#GeneralKnowledgeIndia)(#eduvictors)

Environmental Institutes

General Knowledge

NTSE/CTET/Competitions

Among the enormous number of foundations and institutes that manage ecological assurance and environmental  protection, a few of known institutes and organizations  (some are government-funded) are listed underneath:

1. Arid Zone Research Institute—Jodhpur

2. Central Pollution Control Board—Delhi

3. Central Museum Authority—New Delhi

4. Rehabilitation Institute of Social Forestry and Ecology— Allahabad/Pryagraj

5. G. B, Pant Himalayan Environment and Development Institute— Almora

6. Himalayan Forest Research Centres - Shimla