SANT NIRANKARI PUBLIC SCHOOL ( NIRANKARI COLONY ) JULY ...

SANT NIRANKARI PUBLIC SCHOOL ( NIRANKARI COLONY ) JULY ( WEEK 4 )

CLASS IX

ENGLISH

ASSIGNMENT I

I. Complete the following dialogue between a secretary and her boss.

a. Boss: Mary, why haven’t you sent that report on new products to the marketing department

yet?

Mary: I’m sorry, Sir. I was just going to send it.

Boss: …………………………………………………

Mary: Yes, I was, but ………………………………………………………….

Boss: …………………………………………………

Mary: Yes, the production department sent some more files in the morning. I have been busy

all this while adding new information to the report.

Boss: Oh, I see. ………………………………………..?

Mary: Yes, I have drafted the report.

Boss: Okay, then, ……………………………..

b. Annie is at her friend Karan’s party. Rohan comes to introduce himself.

Rohan: Hi, I’m Rohan. I’m a friend of Karan. Annie: Oh, ___________________ Karan has

told me a lot about you.

Rohan: You work with him, don’t you? ________________?

Annie: I’m a nurse. _________________?

Rohan: I work at a bank.

Annie: __________________?

Rohan: I’m from Chennai.

ASSIGNMENT 2

I. The following passages have not been edited. There is one error in each line. Write the

incorrect word and the correction against the correct question number. Remember to

underline the word you have supplied.

HINDI

MATHS ASSIGNMENT – I

PROBABILITY

1. A box contains 50 bolts and 150 nuts. On checking the box, it was found that half of the

bolts and half of the nuts are rusted. If one item is chosen at random, find the probability

that it is rusted.

2. A dice is rolled number of times and its outcomes are recorded as below :

Find the probability of

a. getting an odd number.

b. getting an even number.

c. getting prime number.

3. The probability of guessing the correct answer to a certain question is x/ 2.If probability

of not guessing the correct answer is 2 /3 then find x.

4. In a survey of 364 children aged 19-36 months, it was found that 91 liked to eat potato

chips. If a child is selected at random, compute the probability that he/she does not like

to eat potato chips.

5. In a medical examination of students of a class, the following blood groups are recorded

:

A student is selected at random from the class. Find the probability that

a. he/she has blood group B.

b. he/she has blood group AB.

c. he/she doesn’t have blood group O.

6. Two coins are tossed 1000 times and the outcomes are recorded as below :

Based on this information, find the probability of :

a. getting at most one head.

b. getting atleast one head.

c. getting no tail.

ASSIGNMENT – II PROBABILITY

7. A bag contains x white, y red and z blue balls. A ball is drawn at the random, then what

is the probability of drawing a blue ball.

8. In a throw of a die, find the probability of not getting 4 or 5.

9. In a sample study of 642 people, it was found that 514 people have a high school

certificate. If a person is selected at random, find the probability that the person has a

high school certificate.

10. Three coins are tossed simultaneously 200 times with the following frequencies of

different outcomes ;

If the three coins are simultaneously tossed again, compute the probability of

a. getting 2 heads .

b. getting 3 tails.

c. getting 2 tails.

11. 750 families with 3 children were selected randomly and the following data recorded

If a family member is chosen at random, compute the probability that it has :

(i) no boy child

(ii) no girl child

12. If the probability of winning a race of an athlete is 1 / 6 less than the twice the probability

of losing the race. Find the probability of winning the race.

PHYSICS

ASSIGNMENT - I

TOPIC : FORCE AND LAWS OF MOTION 1. A 200kg motorcycle is moving over a horizontal road with uniform velocity. If this motorcycle

has to be stopped with a negative acceleration of 1.5m/s2 , hen what is the force of friction

between the tyre of the motorcycle and the road?

2. An iron sphere of 1kg is moving a velocity of 20m/s on a cemented floor. It comes to

rest after traveling a distance of 50 m. Find the force of friction between the sphere and

the floor.

3. A ball of mass 100g moving with a velocity of 0m/s is stopped by a boy in 0.2s. Calculate

the force applied by the boy to stop the ball.

4. A car weighing 2400 kg and moving with a velocity of 20 m/s is stopped in 10s on

applying breaks. Calculate the retardation and retarding force?

5. A car of mass 1000kg and a bus of mass 8000kg are moving with the same velocity of

36 km/h. Find the forces to stop both the car and the bus in 5s.

6. A mechanic strikes a nail with a hammer of mass 500g moving with a velocity of 20m/s

The hammer comes to rest in 0.02s.after striking the nail. Calculate the force exerted by

the nail on the hammer.

7. A bullet of mass 10g traveling with a velocity of 100 m/s penetrates in a wooden plank

and is brought to rest in 0.01s Find (a) the distance through which the bullet penetrates in

the wooden plank and (b) the force exerted on the bullet.

8. A bullet of mass 100g is fired from a gun of mass 20 kg with a velocity of 100m/s. Calculate

the velocity of recoil of the gun.

9. Two bodies each of mass 1kg are moving in a straight line but opposite in direction with

the same velocity of 2m/s. They collide with each other and stick to each other after collision.

What is the common velocity of these bodies after collision?

(CHEMISTRY)

ASSIGNMENT – II Q.1. Oxygen is – (a) Monovalent (b) Bivalent (c) Trivalent (d) Tetravalent Q.2. What is the molecular formula for Calcium Hydroxide? Q.3. What is the mass of: (a) 0.2 mole of oxygen atoms? (b) 0.5 mole of water molecules? Q.4. Calculate the number of molecules of sulphur (S8) present in16 g of solid sulphur. Q.5. Write the chemical formulae of the following. (a) Magnesium chloride (b) Calcium oxide (c) Copper nitrate (d) Aluminium chloride (e) Calcium carbonate. Q.6. Calculate the molar mass of the following substances. (a) Ethyne, C2H2 (b) Sulphur molecule, S8 (c) Phosphorus molecule, P4 (d) Hydrochloric acid, HCl (e) Nitric acid, HNO3 Q.7. Convert into mole. (a) 12 g of oxygen gas (b) 20 g of water (c) 22 g of carbon dioxide Q.8. Write down the names of compounds represented by following formulae: (a)Al2(SO4)3 (b) CaCl2 (c) K2SO4 (d) KNO3 (e) CaCO3

BIOLOGY

ASSIGNMENT - III [WHY DO WE FALL ILL]

Q1. What is meant by symptoms of a disease?? Q2. What is a source of infection?? Q3. How does WHO define health?? Q4. Classify diseases on the basis of their time of occurrence and define Q5. What are vectors? Explain by giving examples

Q7. What do you mean by immune system? Q8. Expand AIDS and HIV Q9.How can AIDS be transmitted? Q10. Why should not vegetables and pulses be washed repeatedly for a long time? Q11. What is an antibiotic? Give two examples. Q12. Who discovered ‘vaccine’ for the first time? Name two diseases which can be prevented by using vaccines. Q13. What is a balanced diet? Q14. Why is mother’s milk best for babies? Q15. What are the two basic principles of prevention of infectious diseases?

SOCIAL SCIENCE ASSIGNMENT – I

Question 1. The sum total of weather conditions and variation over a large area for a long period of time is referred to as _______ . Question 2. The climate of India is described as the _______ . Question 3. On a winter night, the temperature at Drass in Jammu and Kashmir may be as low as _______ . Question 4. What are thunder storms called in West Bengal? Question 5. The Tropic of Cancer passes through the _______ . Question 6. The pressure and wind system of any area depend on the _______ . Question 7. Name the two branches of the monsoon.

ASSIGNMENT - II Question 8. The climate of India is strongly influenced by _______ . Question 9. Where is equable type of climate found? Question 10. The monsoon is known for its _______ . Question 11. What do you mean by mango showers? Question 12. The state of normal rainfall increasing suddenly and continuing constantly for several days is known as _______ . Question 13. An apparent force caused by the earth’s rotation is called Question 14. Why do coastal areas experience less contrast in temperature conditions? Question 15.

Wind generally blow from the area of _______ . Answer:

ASSIGNMENT - I Topic: Communication Skills

Choose the correct option

ASSIGNMENT - II SUBJECT: Information Technology

Topic: Communication Skills On the basis of your understanding of communication complete the following sentences with appropriate words. Choose from the words given in brackets.

1. Communication is the act of ………………………… in which two or more persons are involved. (talking to each other through signals when you are alone/ sharing ideas, thoughts and opinions)

2. All human beings communicate with …………….every day in different kinds of situations. ( each other/ friends)

3. Communicating …………….with people at the work place is very important. (nicely/ properly/ clearly)

4. If communication is not done correctly ………….. may not happen properly. ( work/ thoughts)

5. While communication with others at the work place we share opinions, …………,………….and ………. with them. ( choose any 3-ideas/ information/ messages / signals/ feelings)

6. Two people who communicate with each other are called - ………………………….and…………….(giver/ sender/ receiver/ communicator)

7. An effective communicator is one whose ideas, ……………… and ……………are clear and understandable. (chose any 2- messages/ opinions/images/facts….)

Look at Figure given below.

What are the people doing? For e.g. What are people doing in box 1 ? What is happening in box 2,3 and 4? Is there a common term or one word to describe the activity which all the people are engaged in ?