R.N.F LITTLE HEART SCHOOL

CLASS: IX

ENGLISH Total Lockdown – explain its pros and cons

SCIENCE Activity i)Take one plastic bottle. ii)Make small holes using a needle at different height (at least 3 holes ). iii) Close the holes using cellotape. iv) Fill the bottle with water. v) Remove the cellotape and open the holes. vi) Write your observation. vii)Give neat and clean diagram of the happenings. viii) Mention your conclusion.

MATHS

Activity i)Day wise collect the data of corona incidents in our country( for one week ). ii)Form a table under following headings :- a)Number of new corona patients. b)Number of persons quarantined. c)Number of person who get cured. d)Number of deaths caused by corona. iii)Show the data for seven days separately (day wise) by-- a)Pie Chart b)Bar Graph

SOCIAL STUDIES What is revolution ? What are its causes?( Write 5 points) Also draw diagram.

Subject: Mathematics

Q1. The sides of a triangle are 8cm; 15cm and 17cm. find its perimeter and its area. Also

find the length of the altitude drawn on the side with length 17cm.

Q2. The perimeter of the triangle is 44cm. if its sides are in the ratio 9:7:6 find its area.

Q3. The base of a right angled triangle is 5cm and hypotenuse is 13cm. Find its area.

Q4. Find the area of quadrilateral ABCD whose sides are 9m, 40m, 28m and 15m. The angle

between the first two sides is a right angle.

Q5. Find the area of a trapezium whose parallel sides measure 60cm and 77cm and non-

parallel sides are 25cm and 26cm.

Q6. It is possible to draw a circle which passes through three collinear points (T/F)

Q7. The perpendicular bisector of two chords intersect at centre of circle (T/F)

Q8. If two arcs of a circle are congruent. Then corresponding chords are unequal (T/F)

Q9. The line joining the mid-point of a chord to centre of circle is perpendicular to chord.

(T/F)

Q10. If O is the center of circle of radius 5 cm OP perpendicular to AB and OQ

perpendicular to CD, AB||CD, AB = 6cm and CD = 8 cm. Determine PQ.

Q11. The length of the chord of a circle is 30 cm and its distance from the centre is 8 cm.

Find the radius of the circle.

A. 10 cm

B. 20 cm

C. 34 cm

D. 17 cm.

Q12. In a circle radius is 13cm, a chord is drawn at a distance of 12cm from the centre. Find

the length of the chord.

A. 5 cm

B. 10 cm

C. 15 cm

D. 30 cm

Circles

1.It is possible to draw a circle which passes through three collinear points (T/F)

2.The perpendicular bisector of two chords intersect at centre of circle (T/F)

3.If two arcs of a circle are congruent. Then corresponding chords are unequal (T/F)

4.The line joining the mid-point of a chord to centre of circle is perpendicular to chord. (T/F)

5.If O is the center of circle of radius 5 cm OP perpendicular to AB and OQ perpendicular to CD, AB||CD,AB = 6cm and CD = 8 cm. Determine PQ.

6.In the given figure what is the measurement of angle ABC

(A) 50° (B) 40° (C) 90° (D) 75°

7.Find the angle ADC

(A) 20 degree (B) 40 degree (C) 60 degree (D) 80 degree

8.The length of the chord of a circle is 30 cm and its distance from the centre is 8 cm. Find the radius ofthe circle.

(A) 10 cm (B) 20 cm (C) 34 cm (D) 17 cm.

9.In the given figure, chords AB and CD subtend equal angles each = 70° at the centre O of the circle. OL

AB and AL = 2.5 cm find CD.

(A) 2 cm (B) 2.5 cm (C) 7.5 cm (D) 5 cm

10.The adjoining figure, AB is the diameter of the circle with centre O. A chord CD is bisected by thediameter at P. If OA = OB = 15 cm and OP = 9 cm. Find the length of chord AD.

(A) (B) 12 cm (C) 13cm (D)

11.In a circle radius is 13cm, a chord is drawn at a distance of 12cm from the centre. Find the length ofthe chord.

(A) 5 cm (B) 10 cm (C) 15 cm (D) 30 cm

12.Two parallel chords of a circle whose radius is 13 cm are respectively 10 cm and 24 cm. If they live onthe opposite side of the centre find the distance between them.

(A) 10 cm (B) 7 cm (C) 17 cm (D) 13 cm

13.In the adjoining figure, N is the mid point of the chord LM of a circle where centre is O. If OLN =40°, find the measure of LON

(A) 50° (B) 120° (C) 90° (D) 75°

14.Two parallel chords of a circle whose radius is cm, are 12 cm and 18 cm. Find the distancebetween them. Both chords are on the same side of the centre.

(A) 7 cm (B) 5 cm (C) 3 cm (D) 15 cm

15.In figure, a square is inscribed in a circle of radius cm. Find the length of the square

(A) 12 cm (B) 8 cm (C) 16 cm (D) 10 cm

16.In the given figure, O is the centre of the circle, AB and CD are two chords such that OL isperpendicular to AB and OM is perpendicular to CD. ÐAOB = 50°, AL = DM = 2 cm. Find the measure of

COD.

(A) 50° (B) 70° (C) 90° (D) 130°

17. ABC is inscribed in a circle with centre O. IF ACB = 40°, find B.

(A) 65° (B) 90° (C) 40° (D) 50°

18. ABC is inscribed in a circle and AD BC meets BC at D and AD produced meets the circle at L. IfÐABD is 35° then find the measure of ÐBCL.

(A) 55° (B) 60° (C) 90° (D) 35°

19.In the adjoining figure, O is the centre of the circle, find the measure of angle X.

(A) 85° (B) 110° (C) 50° (D) 35°

20.In the figure, Q = 80° find S

(A) 100° (B) 80° (C) 90° (D) 110°

21.From the given figure, find the value of x

(A) 108° (B) 72° (C) 60° (D) 36°

22.In the given figure, O is the centre of the circle. If AOC = 90°, find ABC

(A) 45° (B) 90° (C) 135° (D) 75°

23.Given cyclic trapezium ABCD in which AD || BC and B = 60°, Determine A.

(A) 90° (B) 120° (C) 60° (D) 30°

24.In the adjoining figure, in circle with centre O. BDC = 40°, find ACB.

(A) 50° (B) 45° (C) 40° (D) 90°

25.ABC is inscribed in a circle. The bisector of A meets the circle in L and the bisector of C meets AL

at K. If BAC = 80° and ACB = 60°, find LCK

(A) 40° (B) 30° (C) 90° (D) 70°

26.In the adjoining figure, O is the centre of the circle, AOB = 90°, BOC = 120°

(A) 150° (B) 75° (C) 50° (D) 120°

27.In the figure, diameter AB = 30 cm, chord AC = 24 cm. Find how far is the chord AC from the centre ofthe circle ?

(A) 9 cm (B) (C) 6 cm (D) 12 cm

28.In the adjoining figure, CD is the diameter which meets the chord AB in E such that

AE = BE = 4 cm. If CE is 3 cm. Find the radius of the circle.

(A) cm (B) cm (C) 3 cm (D) 4 cm

29.In the given figure AOB and COD are the two diameters of a circle with centre O. If BDO = 50°, findACO

(A) 50° (B) 130° (C) 90° (D) 75°

30.O is the centre of a circle and the measure of arc ABC is 100 degree. Determine angle ADC and Angle

ABC

31.A line l intersecting two concurrent circles having same center is O, at the point A,B,C,D. Show thatAB=CD.

32.Prove that the line joining to the centre of circle to the mid-point of a chord, is perpendicular to thechord.

33.Prove that equal chords of a circle subtend equal angles at the centre.

34.Bisector AD of angle BAC of Triangle ABC passes through the center O of the circumcircle of triangleABC prove that AB = AC.

35.A,B,C,D are the four points on a circle. AC and BD intersect at a point E such that BEC = 130 degree

and ECD = 20 Degree. Find BAC

36.AB and CD are the two chord of the circle such that AB = 6 cm , CD = 12 cm and AB||CD, if the

distance between AB and CD is 3 cm, find the radius of the circle.

37.A circular park of radius 20 m is situated in a colony. Three boys Ankur Syed and David are sitting atequal distance on its boundary each having a toy telephone in his hands to talk to each other. Find thetotal length of the string.

38.Given an arc of circle how you will find its centre and complete the circle.

39.Two equal chord AB and CD of circle with center O, when produced meet at a point E, prove thatBE=DE and AE=CE

40.In a circle with centre O, Chords AB and CD intersect inside the circumference at E. Prove that

AOC+ BOD = 2 AEC

41.If OA and OB are respectively perpendicular to chords CD and EF of a circle whose centre is O. if OA =OB, prove that CD=EF.

ASSIGNMENT FOR THE SESSION 2013-2014

Class: IX Subject : English Assignment No. 3

1. Read the passage carefully:-

Our country gave birth to a mighty soul and he shone like a beacon not only for India but

also for the whole world. And yet he was done to death by one of our own brothers and

compatriots. How did this happen? You might think that it was an act of madness, but that

does not explain this tragedy. It could only occur because the seed for it was sown in the

poison of hatred and enmity that spread throughout the country and affected so many of our

people. Out of that seed grew this poisonous plant. It is the duty of all of us to fight this

poison of hatred and ill-will. If we have learnt anything from Gandhiji, we must bear no ill or

enmity towards any person. The individual is not our enemy; it is the poison within him that

we must fight and which we must put an end to.

Read the above passage carefully and answer the following questions :-

(i) Who is “the mighty soul“referred to in the passage?

(ii) Why was he done to death?

(iii) What do we learn from Gandhiji?

(iv) What should we fight against in the individual?

(v) What is the poison referred to in this passage?

2. Prepare a speech on the topic “Qualities required for success.”

3. You have been participating in an Environment Protection Week. Write an e-mail to your

cousin describing your experience in about 120 words. You may take help from the following

points

* treatment of garbage

* no garbage heaps

* different dustbins for garbage

* biodegradable and non-biodegradable

4. There is an error in each line. Mark the error and write the correction.

Error / Correction

Indira Gandhi was an only daughter of e.g. : an / the .

Pd. Jawaharal Nehru. She is outspoken a._______ /_________

bold or courageous like her father. b._______ /_________

India can alway be boastful of great c._______ /_________

men and women. She reminds you of d._______ /_________

Rani off Jhansi. Her political education e._______ /_________

started in the age of three when she f._______ /_________

attend the Congress Session on g._______ /_________

a lap of her mother. h._______ /_________

5. Look at the newspaper items below. Use the information to complete the paragraph.

i) DTC TO REPLACE FLEET WITH LUXURY BUSES.

The existing fleet of DTC buses ________ with modern low floor luxury buses before

the Commonwealth Games.

ii) FAKE DOCUMENTS RACKET BUSTED

A racket in printing and selling of fake documents ________________ Police. One

person has been arrested in this connection.

PHYSICS

CHAPTER : MOTION

1. Define acceleration and state its SI unit. For motion along a straight line,when do we consider the acceleration to be (i) positive (ii) negative? Give an example of a body in uniform acceleration. 2. Find the total displacement of the body from the following graph:

3. A car travels at 54 km/h for first 20 s, 36 km/h for next 30 s and finally 18km/h for next 10 s. Find its average speed. 4. Define acceleration and give its SI unit. When is acceleration of a bodynegative? Give two examples of situations in which acceleration of the body is negative. 5. Distinguish between uniform motion and non, uniform motion. Is uniformlyaccelerated motion uniform motion? Give one example each of uniform and non-uniform motion. 6. The speedometer readings of a car are shown below. Find the accelerationof the car and its displacement.

Time Speedometer

9:25 am 9:45 am

36 km/h 72 km/h

7. Define uniform circular motion and give example of it. Why is it calledaccelerated motion?

CHAPTER: MATTER IN OUR SURROUNDINGS

1. Why do we see water droplets collected on the outer surface of a glasscontainer, containing ice? 2. Explain why solids have fixed shape but liquids and gases do not have fixedshape.

3. Why is it advisable to use pressure cooker at higher altitudes?4. What are fluids?5. Why is water liquid at room temperature?6. Cotton is solid but it floats on water. Why?7. Why are solids generally denser than liquids and gases?8. Name the factors that affect evaporation.9. How is the high compressibility property of gas useful to us?10. With the help of an example, explain how diffusion of gases in water isessential? 11. On a hot sunny day, why do people sprinkle water on the roof or openground? 12. Why to people perspire a lot on a hot humid day?13. A balloon when kept in sun, bursts after some time. Why?14. Pressure and temperature determine the state of a substance. Explain thisin detail. 15. Explain giving examples the various factors on which rate of evaporationdepends.

BIOLOGY – WHY DO WE FALL ILL

1. What are pathogens?2. Name two disease spread by bacteria and by fungi each.3. Name two air-borne diseases.4. What are acute diseases?5. Give difference between chronic and acute disease.6. State two main causes of diseases.7. Why sick person is advised to take rest?8. Give function of antibiotic penicillin.9. What are disease specific means of prevention?10. What are basic conditions of good health?11. What are three limitations for the approach to deal with infectiousdisease? 12. Write a short note on malaria as a disease, its symptoms and control.