Class 9 - Mathematics - Ch10 - Circles (Worksheet) (#CBSENotes)

Circles 

CBSE Class 9 - Mathematics - Chapter 10

Worksheet 

Fill In the blanks

1. A _____ is a set of points in a plane, each one of which is at a constant distance from a fixed point in the plane.


2. A line segment joining two points on a circle is called the ______ of the circle.


3. A line which meets a circle in two points is called a ________ of the circle.


4. A chord passing through the center of the circle is called a ________ of the circle.

Class 10/9/8/7 - English Modal Verbs-Situations Table (#CBSENotes)

English Modal Verbs

Situations Table

Situation	Modal Verb	Example
requests (formal)	may	May I sit down?
requests (informal)	can	Can I sit down?
requests (polite)	would	Would you ind if I sit down?
permission (formal)	may	yoy may sit down
permission (informal)	can	You can sit down

Class 6/7/8/9/10 - संस्कृत - शब्द रूप (#cbsesanskrit) (#sanskrit)

शब्द रूप

संस्कृत

युष्मद् (तू)

Class 7 - Hindi - नीलकंठ - प्रश्न - उत्तर (भाग -२ ) - (#CBSENotes)

नीलकंठ 

नीलकंठ तुम नीले रहियो, दूध-भात का भोजन करियो, हमरी बात राम से कहियो'  

प्रश्न - उत्तर (भाग -२  )

प्र.१  जाली के बड़े घर में पहुँचने पर मोर के बच्चों का किस प्रकार स्वागत हुआ?

उत्तर- जाली के  बड़े घर में मोर के बच्चों के पहुँचते ही वहाँ हलचल मच गई। अन्य जीवों को वैसा ही कौतूहल हुआ जैसा नववधू के आगमन पर परिवार के बाकी सदस्यों में होता है।  लक्का कबूतर नाचना छोड़ कर दौड़ पड़े और उनके चारों और घूम-घूमकर गुटरगूँ करने लगे।  बड़े खरगोश गंभीर भाव से कतार में बैठकर उनका परीक्षण करने लगे।  छोटे खरगोश उनके आसपास उछलकूद मचाने  लगे।  तोते उनका निरीक्षण एक आँख बंद करके करने लगे।


प्र.२: लेखिका को नीलकंठ की कौन सी चेष्टाएँ बहुत भाती थी?

उत्तर- लेखिका को नीलकंठ का गर्दन ऊँची कर देखना, विशेष भंगिमा के साथ उसे नीची कर दाना चुगना और पानी पीना तथा गर्दन टेढ़ी कर शब्द सुनना आदि चेष्टाएँ बहुत भाती थी।  इनके अतिरिक्त पंखों को फैलाकर उसका नृत्य करना भी लेखिका को मोहित कर लेता था।

CBSE Class 9 - Mathematics - Probability - Problems and Solutions

Probability

Problems and Solutions (NCERT Exemplar Answers)

Problem 1: Two dice are thrown simultaneously 500 times. Each time the sum of numbers appearing on their top is noted and recorded as given in the following table:

Sum	2	3	4	5	6	7	8	9	10	11	12
Frequency	14	30	42	55	72	75	70	53	46	28	15

If the dice are thrown once more, what is the probability of getting a sum
(i) 3
(ii) more than 10
(iii) less than 5 or equal to 5
(iv) between 8 and 12

Solution: Click here to see the solution.


Problem 2: Here is an extract from a mortality table:

Age(in years)	60	61	62	63	64	65
Number of persons surviving out of sample of one million	16090	11490	8012	5448	3607	2320

(i) Based on this information, what is the probability of a person 'aged 60' of dying within a year?

(ii)What is the probability that a person 'aged 61'will live for 4 years?

Class 9 - Hindi - गीत-अगीत - कविता का सारांश (#CBSEClass9Notes)

गीत-अगीत

रामधारी सिंह ‘दिनकर’ (१९०८-१९७४)

कविता

गीत, अगीत, कौन सुंदर है?

गाकर गीत विरह की तटिनी

वेगवती बहती जाती है,

दिल हलका कर लेने को

उपलों से कुछ कहती जाती है।

तट पर एक गुलाब सोचता,

"देते स्‍वर यदि मुझे विधाता,

अपने पतझर के सपनों का

मैं भी जग को गीत सुनाता।"

गा-गाकर बह रही निर्झरी,

पाटल मूक खड़ा तट पर है।

गीत, अगीत, कौन सुंदर है?

बैठा शुक उस घनी डाल पर

जो खोंते पर छाया देती।

पंख फुला नीचे खोंते में

शुकी बैठ अंडे है सेती।

गाता शुक जब किरण वसंती

छूती अंग पर्ण से छनकर।

किंतु, शुकी के गीत उमड़कर

रह जाते स्‍नेह में सनकर।

Class 11 - Mathematics - Chapter 1– SETS (NCERT Exercise 1.1) (#CBSENotes)

SETS

Class 11 - Mathematics  

NCERT Exercise 1.1

Question 1: Which of the following are sets? Justify your answer.

(i) The collection of all months of a year beginning with the letter J.
(ii) The collection of ten most talented writers of India.
(iii) A team of eleven best-cricket batsmen of the world.
(iv) The collection of all boys in your class.
(v) The collection of all natural numbers less than 100.
(vi) A collection of novels written by the writer Munshi Prem Chand.
(vii) The collection of all even integers.
(viii) The collection of questions in this Chapter.
(ix) A collection of most dangerous animals of the world.


Answer:

(i) Yes
The collection of all months of a year beginning with the letter J is a well-defined collection of objects since one can definitely identify a month that belongs to this collection. Hence, this collection is a set.

(ii) No
The collection of ten most talented writers of India is not a well-defined collection because the criteria for determining a writer’s talent may vary from person to person. Hence, this collection is not a set.

(iii) No
A team of eleven best cricket batsmen of the world is not a well-defined collection because the criteria for determining a batsman’s talent may vary from person to person. Hence, this collection is not a set.

(iv) Yes
The collection of all boys in your class is a well-defined collection because you can definitely identify a boy who belongs to this collection. Hence, this collection is a set.

(v) Yes
The collection of all natural numbers less than 100 is a well-defined collection because one can definitely identify a number that belongs to this collection. Hence, this collection is a set.

(vi) Yes
A collection of novels written by the writer Munshi Prem Chand is a well-defined collection because one can definitely identify a book that belongs to this collection. Hence, this collection is a set.

(vii) Yes
The collection of all even integers is a well-defined collection because one can definitely identify an even integer that belongs to this collection. Hence, this collection is a set.

(viii) Yes
The collection of questions in this chapter is a well-defined collection because one can definitely identify a question that belongs to this chapter. Hence, this collection is a set.

(ix) No
The collection of most dangerous animals of the world is not a well-defined collection because the criteria for determining the generousness of an animal can vary from person to person. Hence, this collection is not a set.