ST XAVIER’S SCHOOLS - CHANDIGARH, PANCHKULA, MOHALI, ZIRAKPUR

CLASS VI SUBJECT : ENGLISH WORKSHEET-14

TOPIC - FORMAL LETTER

A letter is a written or printed communication directed to a person or an organization . Letters serve various

purposes ranging from being a medium of exchange of thoughts , greetings and information to being a

medium of official communication .

Letters are broadly divided into :-

1. Personal or Informal Letters 2. Official or Formal Letters

FORMAL LETTERS :Formal letters are those which we write to people with whom we have formal

relationship. For example- To officials of firms, Editors of newspapers, Principals of schools or colleges

and people not known to us personally.

FORMAT OF A FORMAL LETTER

House No 141,

Sector 21, ( Sender’s address )

Chandigarh.

--------------------------

--------------------------( Space )

1st August,2020. ( Date )

--------------------------

--------------------------( Space )

The Principal,

St.Xavier’s High School,

Sector 20 , Panchkula, ( Receiver’s address )

Haryana.

--------------------------

--------------------------( Space )

Dear Sir/Madam, ( Salutation )

--------------------------

--------------------------( Space )

Subject- A request for-----------------

--------------------------

--------------------------( Space )

_____________________________________________________________________________________

_____________________________________________________________________________________

________________________________________________________________

(Space )

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

__________________________________________________

( Space )

_____________________________________________________________________________________

______________________________________________________________________

--------------------------

--------------------------( Space )

Thanking you,

--------------------------

--------------------------( Space )

Yours faithfully,

Rohan Sharma. (Your full name)

Write a letter to the Principal of your school seeking permission for the change of section.

House No 141,

Sector 21, (your home address)

Chandigarh.

1st August, 2020.

The Principal,

St.Xavier’s High School, (your school address)

Sector 20 , Panchkula,

Haryana.

Dear Sir/Madam,

Subject- A request for the change of section

With due respect I wish to state that I am a student of class VI C of your school. I shall feel very obliged if

you kindly allow me to change my section from C to A. This change will help me in many ways.

I have many friends in section A. They are residents of the same place where I live. If I am shifted to section

A, we could do our home work together. That way, I will be in a position to do much better in my studies.

Kindly grant me the permission to change the section.

Thanking you,

Yours faithfully,

Aryan Verma . (Your full name)

LETTER FOR PRACTICE:

1. Write an application to the Principal of your school requesting him/her to organize a coaching camp for the school cricket team .

2. Write a letter to the editor of a newspaper requesting him/her to start a special edition for school children.

ANSWER KEY OF WORKSHEET 13 :

EXERCISE 1 Read the following sentences and use question mark, exclamation mark, full stop, inverted commas,

capital letters wherever required.

1. Why is the machine not working? 2. Who built the Qutub Minar? 3. O! What a lovely view! 4. He had gone to the Safdarjung Airport. 5. This house belongs to Dr Rupa Banerjee.

EXERCISE 2 Read the following sentences and put inverted commas ,full stop, question mark, exclamation mark,

capital letters or commas wherever required.

1. “She will appear for her entrance examination tomorrow”, said Sumedha. 2. Rita said , “O! What a beautiful view!”

3. Simran has booked a DDA flat. 4. She prayed for the quick recovery of her ailing mother. 5. We should buy electrical goods with ISI mark. 6. Rosy went to Mathura on Thursday as she had an appointment with Dr Sudhir Pandey. 7. Hina said , “Why is the Shatabdi Express late?” 8. The team leader said , “Hurray! We won the running trophy.” 9. My cousin will soon appear for her B.A. examinations.

10. Her cousin is arriving from U.S.A. and she has gone to the Indira Gandhi International Airport to receive him.

EXERCISE 3

Read the following sentences and add colon, semi-colon, apostrophe wherever required

1. My mother is a pious, simple lady; and I love her very much. 2. The things kept in the laboratory are: beakers, test tubes, chemicals. 3. The juicy , fresh fruits were delicious; and we all gobbled it up. 4. A week’s time is enough to finish the pending work. 5. I visited Mr Mehra’s shop.

EXERCISE 4 Rewrite the following sentences using appropriate punctuation marks wherever required.

1. Jawaharlal Nehru was the first Prime Minister of independent India. 2. Safdarjung Tomb, Red Fort, Humayuns Tomb; are all historical monuments. 3. I prayed to God; and asked him for his blessings before my final examination began. 4. “What are you carrying in the packet?”, said Rita to Sheema. 5. I reached the Chennai Airport late yesterday. 6. Aman left for Paris on Tuesday, as he had planned a three weeks trip in advance. 7. I recently read ‘The God of Small Things’ by Arundhati Roy. 8. The Lucknow Station has been spruced up to welcome tourists who are attending the cultural festival. 9. Ms Sangeeta Gupta, the renowned vocalist; sang a bhajan for the elderly people. 10. They laughed, they sang; but soon they were exhausted.

CLASS VI SUBJECT : HINDI WORKSHEET-14

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CLASS VI SUBJECT : PUNJABI WORKSHEET-14

Class - 6 Punjabi Worksheet – 12 (For Mohali & Zirakpur Branches only)

(For refrence see worksheet – 13)

Answer key of Punjabi Worksheet – 11 (For Mohali & Zirakpur Branches Only)

CLASS VI SUBJECT : SANSKRIT WORKSHEET-14

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CLASS VI SUBJECT : MATHEMATICS WORKSHEET-14

TOPIC- PLAYING WITH NUMBERS

LEAST COMMON MULTIPLE (LCM):- LCM is the smallest number from the common multiples of given

numbers. It is also called lowest common multiple.

We can find LCM of two or more natural numbers by the following two methods.

1) Prime factorisation method 2) Division method 1) Prime factorisation method: In this method, we write the prime factorisation of each of the given

numbers. LCM is the product of all the different rime factors of the given numbers using each

common prime factor the greatest number of times it appears in the prime factorisation of any of the

given numbers. (Illustrated in Q1)

2) Division method: In this method, we divide the given numbers by a number which divides exactly at least two of the given numbers and carry forward the numbers which are not divisible. We keep on

repeating this process till no two numbers have a common factor. The product of the divisors and the

remaining numbers is the LCM of the given numbers. (Illustrated in Q2)

(Both the methods are illustrated with examples in exercise given ahead)

Relation between HCF and LCM of two natural numbers.

The product of HCF and LCM of two natural numbers = the product of the numbers.

LCM of two natural numbers = their product

their HCF

HCF of two natural numbers= their product

their LCM

Product of HCF and LCM of two natural number

one number= other number

If two natural numbers are co-prime numbers, then their LCM= product of the numbers. LCM of two natural numbers is always exactly divisible by their HCF.

Q1. Find the LCM of the given numbers by prime factorisation method.

1) 36, 40, 126(ILLUSTRATION)

2 36 2 40 2 126

2 18 2 20 3 63

3 9 2 10 3 21

3 3 5 5 7 7

1 1 1

36= 2x2x3x3

40=2x2x2x5

126=2x3x3x7

Note that 2 occurs as a prime factor maximum 3 times, 3 two times, 5 one time and 7 one time.

Therefore, LCM of 36, 40 and 126 = 2x2x2x3x3x5x7 = 2520

2) 28, 98 3) 108, 135, 162 4) 24, 28, 196

Q2 Find the LCM of the given numbers by division method:

1) 16, 22, 40(ILLUSTRATION)

LCM of given numbers = 2x2x2x2x11x5 = 880

2) 480, 672 3) 6, 8, 45 4) 24, 40, 84 5) 20, 36, 63, 77

Q3(a) Find the least number which when divided by 12, 16 and 36 leaves a remainder 7 in each

case.(ILLUSTRATION)

Solution. First we find the least number which is exactly divisible by 12, 16 and 36. For this, we find

LCM of 12, 16 and 36.

Therefore, LCM of 12, 16 and 36 = 2x2x3x4x3 = 144

So, 144 is least number which is exactly divisible by 12, 16 and 36 i.e. 144 is the least number which

when divided by the given numbers will leave the remainder 0 in each case. But we need the least

number which leaves the remainder 7 in each case. Therefore, the required number = 144+7 = 151

(b) Find the least number which when divided by 6, 15 and 18 leaves a remainder 5 in each case.

(c) Find the least number which when divided by 24, 36, 45 and 54 leaves a remainder 3 in each case.

Q4 (a) Find the least number which when increased by 10 is exactly divisible by 14, 35, 40 and

56.(ILLUSTRATION)

Solution. First we find the least number which is exactly divisible by the numbers 14, 35, 40 and 56.

For this, we find LCM of 14, 35, 40 and 56.

Therefore, LCM of given numbers = 2x2x2x5x7 = 280

According to given condition, the required number will be 10 less than 280.

Therefore, the required number = 280-10=270.

(b) Find the least number which when increased by 15 is exactly divisible by 15, 35 and 48.

Q5 (a) Find the greatest 4- digit number which is exactly divisible by each of 12, 18 and

30.(ILLUSTRATION)

Solution. First, we find the LCM of 12, 18 and 30

LCM of given number = 2x3x2x3x5 = 180

Greatest 4 digit number = 9999

We divide 9999 by 180 and find the remainder .

According to given condition, we need a greatest 4-digit number which is exactly divisible by 180

Therefore, the required number = 9999 – 99 = 9900

(b) Find the greatest 3- digit number which is exactly divisible by each of 8, 20and 24.

Q6 (a) Find the smallest number of 5-digit number which is exactly divisible by 15, 24 and

40.(ILLUSTRATION)

Solution. First, we find LCM of 15, 24 and 40

LCM of given numbers = 2x2x2x3x5=120

Smallest number of 5-digits=10000.

We divide 10000 by 120 and find the remainder.

According to given condition, we need a least number of 5-digits which is exactly divisible by 120.

Therefore, the required number = 10000+(120-40)=10080

(b) Find the smallest number of 4-digit number which is exactly divisible by 32, 36and 48.

(c) Find the smallest number of 5-digit number which is exactly divisible by 32, 36and 45.

Q7 (a) Find the HCF of 198 and 78. Hence, find their LCM.(ILLUSTRATION)

Solution. We use division method to find the HCF of 198 and 78.

Therefore, HCF of 198 and 78=6

Therefore, LCM of 198 and 78 =Product of numbers

their HCF=

198x78

6=198x13=2574

(b) Find the HCF of 180 and 336. Hence, find their LCM.

Q8 (a) The HCF and LCM of two numbers are 6 and 840 respectively. If one of the number is 42, find the

other number.(ILLUSTRATION)

Solution. HCF of two number = 6

LCM of these numbers =840

One of the number = 42

We know that the product of LCM and HCF of two numbers= product of the numbers

→840x6=42 x other number

→other number = 840x6

42=20x6=120

Hence, the other number is 120.

(b) The HCF and LCM of two numbers are 9 and 270 respectively. If one of the number is 45, find the

other number.

Q9(a) If the product of two numbers is 8505and their HCF is 15, find their LCM.(ILLUSTRATION)

Product of two numbers = 8505

HCF = 15

LCM = ?

Using formula, product = HCF x LCM

8505 = 15 x LCM

LCM= 8505

15 = 567

Therefore, LCM = 567

(b) If the product of two numbers is 4032 and their HCF is 12, find their LCM.

Answer key of worksheet 13

Q1 (2) 4 (3)18 (4) 35

Q2 (2) 33 (3) 4 (4) 12

Q3 (1) 1 (2) 1 (3) 2

Q4 (b) 36

Q5 (b) 3 kg (c) 31 litres

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CLASS VI SUBJECT : GEOGRAPHY WORKSHEET-14

Chapter- 5 Minerals

Minerals:- The natural materials in which the metals or their compounds are found in earth are

called minerals. All the minerals cannot be used to extract metals because:

Some minerals may contain only a small percentage of the metal.

A mineral may contain some undesirable impurities.

Those minerals from which the metals can be extracted conveniently and profitably are called ores.

An ore contains a good percentage of metal and there are no undesirable impurities in it.

Types of minerals

Minerals are broadly divided into two main groups:

1. Metallic Minerals:--Metallic minerals are those from which we obtain metals. Iron, gold,

copper, silver, aluminum, tin are some of the important examples of metallic minerals.

Metallic minerals may be ferrous or non-ferrous. Ferrous minerals like iron ore, manganese

and chromites contain iron. A non-ferrous mineral does not contain iron but may contain some

other metal such as gold, silver, copper or lead.

2. Non-metallic Minerals:- Non-metallic minerals are those which do not contain metals.

Coal, mica, sulphur, potash, petroleum are some of the important non-metallic minerals.

Metallic Minerals

1.Iron Ore :- Iron ore is the basis of modern civilization. It forms the foundation of industrial

growth. It is used in almost all types of machines, machine tools, construction of buildings,

factories and various means of transport. Iron ore is considered as the backbone of modern

civilization because development of all other industries depends on iron ore. There are two

main iron ore minerals: haematite and magnetite. In comparison to other metals, it is the most

widely used metal in the world.

2. Bauxite:- Bauxite is an ore of aluminum. Aluminum is a light metal and is a good conductor

of heat and electricity. It is used for making utensils, spare parts of automobiles, aeroplanes

and in the ship building industry. It is also used in electrical equipment industry and for

transmitting electricity. It can be made stronger by mixing it with other metals to form alloys.

Duralumin is an important alloy of aluminium.

3. Manganese:- Manganese is an important mineral which is used for making iron and steel.

It is also a basic raw material for manufacturing its alloy. It increases the strength of steel. It

is also used for making paints, glass, chemicals, etc.

4. Copper:- Copper is a reddish orange metal that has been widely used for more than five

thousand years. Copper is the first metal discovered and used by man. The physical properties

of copper make it valuable to industry. One of the useful properties of copper is its

conductivity. Copper is best known for its ability to conduct electricity. Copper is also a good

conductor of heat. This property makes copper useful in making cooking utensils, radiators

and refrigerators. Copper is also used to make alloys such as brass and bronze.

EXERCISES

A) Answer the following questions briefly:-

1. Define minerals.

2. What are metallic minerals?

3. What are non-metallic minerals?

4. Why copper is used for making radiators?

5. Name a mineral which is used for making iron and steel.

6. Distinguish between metallic and non- metallic minerals.

B) Fill in the blanks with suitable words:-

1. _________and __________ are metallic minerals.

2. _________and __________are non-metallic minerals.

3. _________ is a light metal and a good conductor of heat and electricity.

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Answer key for Worksheet 13 (History) Class 6

EX A.

1. A large number of playthings, like miniature carts, dice, marbles, maze, squirrels

and a toy bullock whose head moves at the pull of a string, have been excavated and

statuettes such as that of a bearded shawl-clad man show that the Harappan

craftsmen were highly skilled.

2. A piece of woven cloth unearthed at Mohenjo-daro, clay spindles and the statuette

of a shawl-clad man are evidences that the Harappans were skilled in the art of

weaving.

3. There are many reasons to believe that the Indus people carried on overseas trade

-

i) The remains of a dockyard have been found at Lothal in Gujarat.

ii) A seal depicting a seagoing ship has also been found.

iii) Mesopotamian records mention Meluha, a name used for the Indus Valley

Civilisation. Moreover, Mesopotamian seals have been found in Indus cities, and

Indus seals in Mesopotamia.

4. The Harappans believed in life after death. They buried their dead, often in huge

burial urns, along with food, ornaments and the articles used by them in their daily

life.

5. The Indus civilisation probably declined due to natural disasters.

Ex B.

1. Agriculture - The Indus farmers grew wheat, barley, gram, peas, maize and millets.

They were the first to grow cotton in India. They used ploughs and sickles, and

different methods of irrigation. They domesticated many animals including oxen,

buffaloes, goats, sheep, pigs, donkeys and camels.

Trade - Trading thrived, and was conducted according to a set of rules. The

merchants used uniform weights and measures.

2. Most of the Harappan seals are square or rectangular tablets, usually made of

steatite (soft soapstone).Most of them have short inscriptions and the impression of a

bull, buffalo, tiger, goat, rhinoceros or an elephant. Some seals show a male god.

Some have a hump at the back, which has a hole in it.

More than 2,000 seals have been excavated from different sites. This shows that seal-

making was an important craft.

3. The Indus people worshipped nature in the form of animals, birds and trees. For

example, the humped bull, the dove and the pipal tree were held sacred. A mother

goddess was also worshipped.

Ex. C

1. Cotton

2. Copper and bronze

3. Mesopotamia

4. Nine

Ex. D

1. Bronze

2. Lothal

3. 1,000 years

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CLASS VI SUBJECT : CHEMISTRY WORKSHEET-14

Topic: The nature of matter (cont. of worksheet 11)

Metalloids: These are the elements whose properties are intermediate between metals and non-metals.

Noble gases: These gases are found in trace amount in earth’s atmosphere and hence these are also known

as rare gases. These gases are extremely stable, do not react with other gases and hence are known as inert

gases.

Compounds: Compounds are pure substances which are formed by the combination of two or more

elements and can be separated only by chemical means. Eg. Formation of iron sulphide from iron and

sulphur.

Iron is an element (metal) attracted by magnet.

Sulphur is a yellow non-metal which dissolves in carbon disulphide.

A compound has properties different from its constituents elements.

Iron sulphide formed is not attracted by magnet nor it dissolves in carbon disulphide.

Difference Between compounds and mixtures.

Characteristics of compound It is made up of two or more elements chemically combined in fixed ratio of mass.

The properties of compound are entirely different from their constituent elements

It is a homogeneous substance.

It has definite melting and boiling point.

It exhibits definite physical and chemical properties.

Read the given content and answer the following questions

1. Define a) Compound. b) Metalloids c ) Noble gases

2. Write symbols of the following

a) Helium. B) Argon C) Tin. D) silicon e) Neon

3. Write differences between compound and mixture?

4. What are the characteristics of compound?

5. Fill in the blanks.

a) Element which is attracted by magnet___________.

b) Element which is soluble in Carbon disulphide_________.

c) Compound formed when iron reacts with sulphur is__________.

d) The properties of compounds are ________ from its constituent elements.

e) Gases which do not react are known as_______.

6. Find the odd one out and give reason

a) Helium, neon, argon, oxygen, Krypton

b) Hydrogen, hydrogen sulphide, oxygen, iron

7. Iron and sulphur both are elements but hydrogen sulphide is a compound. Explain?

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Answer key of worksheet 13 (Physics)

I. FILL IN THE BLANKS

a) Newton (b) change (c) push (or force) (d) frictional force

(e) Pull, push (f) force

II. COMPLETE THE FOLLOWING STATEMENTS:

a) Stationary body (b) Moving body (c) Force (d) In opposite direction

III. The pull or push on an object is called force. The SI unit of force is Newton (N)

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CLASS VI SUBJECT : COMPUTER APPLICATIONS WORKSHEET-13

ABBREVIATIONS -

SR.NO. ABBREVIATIONS FULL FORM

1. FAT File Allocation Table

2. NIC Network Interface Card

3. HP Hewlett – Packard

4. ODBC Open Database Connectivity

5. CMS Content Management System

6. COMPUTER Common Oriented machine particularly United and Used

under Technical and Education Research

7. BSNL Bharat Sanchar Nigam Limited

8. URL Uniform Resource Located

9. BHIM Bharat Interface for Money

10. NPCI National Payments Corporation of India

11. BIOS Basic Input Output System

12. PDF Portable Document Format

13. USB Universal Serial Bus

14. SQL Structured Query Language

15. C-DAC Centre for development of Advanced Computing

IT PERSONALITIES

SR.NO. IT PERSONALITIES

1. Pyra Labs Company that created the Blogger service in 1999

2. Jack Dorsey Founder of twitter

3. Deep Kalra Founder of makemytrip, online travel booking in India

4. Kunal Bahl Co- founder and CEO, Snapdeal.com, an e- commerce

marketplace

5. Binny Bansal and Sachin

Bansal

Co-founders of Flipkart

6. Suvir Sujan Co-founder and Managing Director at Nexus Ventures

7. Vijay Shekhar Sharma Founder, One97 Communications and Paytm – a mobile

wallet and e-commerce marketplace

8. Marissa Ann Mayer CEO and President of Yahoo

9. Ajit Balakrishnan Founder of Rediff.com

10. Ajay Bhatt Co-founder or Co-inventor of USB

11. Gary Stark Weather Invertor of Laser printer

12. Alan Shugart Inventor of Folppy Disk

13. James T Russel Inventor of Compact Disk

14. Pua Khein Seng Inventor of Pendrive

15. Bill Gates Co-founder of Microsoft

SR.NO. SHORTCUT KEYS

1. Ctrl + C , Ctrl + V Copies the text and paste from one place to another

2. Ctrl + X , Ctrl + V Cuts the text and places to a new place

3. Find a Text Ctrl + F

4. Replace a Text Ctrl + H

5. To Preview a mail Merge Alt + Shift + K

6. To merge a document Alt + Shift + N

7. To print the merged

Document

Alt + Shift + M

THIS WEEK - ABBREVIATIONS, IT PERSONALITIES AND SHORTCUT KEYS

(WORD PROCESSOR)[Make sure you copy it in your computer notebook and learn it.]

8. Move to the next

adjoining cell

Tab Key

9. To edit a mail-merge data

document or opens a data

source for mail merge

Alt + Shift + E

10. To select a Paragraph Triple- Click on the Paragraph

11. To insert a merge field Alt + Shift + F

12. Cancel the command and

close the dialog box

ESC Key

ANSWER KEYS OF PREVIOUS WORKSHEET

FILL IN THE BLANKS :-

(1) SORTING the desktop items means arranging them in a proper order.

(2) .DOC or .DOCX is the extension of Microsoft Word.

(3) Click on the option SHOW WINDOWS SIDE BY SIDE to work on multiple applications.

(4) .WAV is an extension of sound files.

(5) File extension contains THREE or FALSE letters appended at the end of the file name,

separated by a period(.).

HINT BOX

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THREE or FALSE; SHOW WINDOWS SIDE BY SIDE; SORTING; .WAV;

.DOC or .DOCX