CBSE Class 9 - Science - CH 13 - Why Do We Fall iLL? (Important Differences)

Why Do We Fall iLL?

 (Important Differences)

Q1: Write three differences between Personal Health and Community Health.

Answer:

Personal Health	Community Health
1. It is a state of physical, mental and social well being.	1. It refers to maintenance, improvement of public health or environmental health.
2. It focuses on individual's health.	2. Its focus is on community health.
3. Objectives are achieved by individual by observing personal and domestic hygiene.	3. Objectives are fulfilled by providing safe water, medical facilities, proper sewage disposal etc.

Q2: What are the important differences between symptoms and signs?

Answer: Please see answer in the previous post Q12.



Q3: Write differences between 'Being Healthy' and 'Disease Free'.

Answer:

CBSE Class 9/10/11/12 - English Vocabulary - One Word Substitution

One Word Substitution

One word, representing a phrase or sentence or clause, helps in communicating precisely. Here is a list of 20 commonly used words. You may also check this quiz on One word Substitution to learn 100+ words.


1. Able to use the left hand and right hand equally well - Ambidextrous

2. A lightly constructed open booth generally used as a newsstand- Kiosk

3. A game in which in which no one wins - Draw

4. A sweet music - Melody

5. An official call to appear in a court of law - Summon

6. Words of similar meaning - Synonyms

7. Belonging to all parts of the world - Universal

CBSE Class 8 - Mathematics - Factorisation - NCERT Exercise (14.2)

Factorisation

NCERT Exercise 14.2

Q1: Factorise the following expressions.

(i) a² + 8a + 16

(ii) p² − 10p + 25

(iii) 25m² + 30m + 9

(iv) 49y² + 84yz + 36z²

(v) 4x² − 8x + 4

(vi) 121b² − 88bc + 16c²

(vii) (l + m)² − 4lm (Hint: Expand (l + m)² first)

(viii) a⁴ + 2a²b² + b⁴


Answer:

(i) a² + 8a + 16 = (a)² + 2 ☓ a ☓ 4 + (4)²

= (a + 4)² [(x + y)² = x² + 2xy + y²]


(ii) p² − 10p + 25 = (p)² − 2 ☓ p ☓ 5 + (5)²

= (p − 5)² [(a − b)² = a² − 2ab + b²]


(iii) 25m² + 30m + 9 = (5m)² + 2 ☓ 5m ☓ 3 + (3)²

= (5m + 3)² [(a + b)² = a² + 2ab + b²]

(iv) 49y² + 84yz + 36z² = (7y)² + 2 ☓ (7y) ☓ (6z) + (6z)²

= (7y + 6z)² [(a + b)² = a² + 2ab + b²]

(v) 4x² − 8x + 4 = (2x)² − 2 (2x) (2) + (2)²

= (2x − 2)² [(a − b)² = a² − 2ab + b²]

= [(2) (x − 1)]² = 4(x − 1)²

(vi) 121b² − 88bc + 16c² = (11b)² − 2 (11b) (4c) + (4c)²

= (11b − 4c)² [(a − b)² = a² − 2ab + b²]

(vii) (l + m)² − 4lm = l² + 2lm + m² − 4lm

= l² − 2lm + m²

= (l − m)² [(a − b)² = a² − 2ab + b²]

(viii) a⁴ + 2a²b² + b⁴ = (a²)² + 2 (a²) (b²) + (b²)²

= (a² + b²)² [(a + b)² = a² + 2ab + b²]

CBSE Class 9/10 - English Grammar - Editing Exercise - 4

Editing Exercise

The following sentences have not been edited. There is one error in each line. Write the incorrect word and correction. Remember to underline the word you have supplied.

-	Incorrect	Correct Word
1. Radha sat in a tree.	________	________
2. He likes cutting jokes.	________	________
3. I want a pen to write on.	________	________
4. Mohan needs not worry.	________	________
5. Are you a member in the committee?	_______	_______
6. What is the cost of this pen?	_______	_______
7. Verbal orders will not be obeyed.	_______	_______
8. I saw a bad dream last night.	_______	_______

CBSE Class8 - Mathematics - Ch 14 - Factorisation (NCERT Ex 14.1)

Factorisation

NCERT Exercise 14.1 Solutions

Q1: Find the common factors of the terms

(i)   12x, 36

(ii)  2y, 22xy

(iii)  14pq, 28p²q²

(iv) 2x, 3x², 4

(v) 6abc, 24ab², 12a²b

(vi) 16x³, −4x², 32x

(vii) 10pq, 20qr, 30rp

(viii) 3x²y³, 10x³y², 6x²y²z

Answer:

(i) 12x = 2 ☓ 2 ☓ 3 ☓ x

36 = 2 ☓ 2 ☓ 3 ☓ 3

The common factors are 2, 2, 3.

And, 2 ☓ 2 ☓ 3 = 12

(ii) 2y = 2 ☓ y

22xy = 2 ☓ 11 ☓ x ☓ y

The common factors are 2, y.

And, 2 ☓ y = 2y

(iii) 14pq = 2 ☓ 7 ☓ p ☓ q

28p²q² = 2 ☓ 2 ☓ 7 ☓ p ☓ p ☓ q ☓ q

The common factors are 2, 7, p, q.

And, 2 ☓ 7 ☓ p ☓ q = 14pq

(iv) 2x = 2 ☓ x

3x² = 3 ☓ x ☓ x

4 = 2 ☓ 2

The common factor is 1.

CBSE Class 9 - English (C) - CH 12 - Song of the Rain - A summary

Song of the Rain

Summary

Poet: Khalil Gibran

Khaill Gibrain, a Lebanese poet and writer. In his young age, he settled in America. The style of his poems s very formal and it offers a deep insight into various facts of human life. 'The Prohet' his one of the famous works.

                     
Summary:

CBSE Class 12 - NEET - Biology - The Living World (MCQs)

Biology - The Living World

7 MCQs from previous AIPMT/NEET question papers

Q1: The living organisms can be unexceptionally distinguished from the non-living things on the basis of their ability for

(a) responsiveness to touch
(b) interaction with the environment and progressive evolution
(c) reproduction
(d) growth and movement



Q2: There is no life on the moon due to the absence of 

(a) oxygen
(b) water
(c) light
(d) temperature



Q3: Praying Mantis is the example of 

(a) warning coluration
(b) social insects
(c) camouflage
(d) Mullerian mimicry