chemistry holiday homework (2016 - 17) - laxman...

CHEMISTRY HOLIDAY HOMEWORK (2016 - 17) CLASS VIII

Project Environmental Concerns GENERAL INSTRUCTIONS:

The assignment should be done in your chemistry notebook.

It should be submitted on 16/1/2017.

It will be marked on the basis of Presentation, Content, Originality, Viva and Timely Submission. (Each parameter carries 1 mark)

Choose any 1 of the following topics to do your project.

1) Global Warming

2) Greenhouse Effect

3) Ozone Layer Depletion

4) Air Pollution Write about the causes, consequences and remedial measures of your chosen topic. Note: The use of internet should be limited to pictures which can be downloaded from the internet. Use reference books, science journals, encylopaedias, newspapers, magazines, etc. to do your research. Provide a bibliography page to list the reference material used.

Laxman Public School

Winter Holidays Homework

(2016-2017)

Class VIII

Subject: Computer

Revise Chapter 9 and 10.

Activity: Create Web Pages with HTML tags.

1. Create a Web site with two linked Web pages on the topic Greenhouse

Effect and Global Warming. The first Web Page should give information

on the green house effect and the second should give information on global

warming. Also include relevant Pictures.

2. Create an HTML document show a table giving the names of seven

wonders of world and their Images.

Instructions

1. Platform: Notepad & Web Browser

2. Submit Printouts containing HTML code and their output in File and

softcopy of WebPages.

3. The first page of the file should have the following details:

Name of the Student

Class and section

Session

08

Second term (2016-17)

Assignments (SA2) 1 - , ? . -2 ? ? 1 , . . . 1 ? . 2 . 1 - / ? . 2 .

Mathematics Assignments Class VIII TERM I 2016 17

1

CHAPTER 9: ALGEBRAIC EXPRESSIONS & IDENTITIES

CHAPTER 14: FACTORISATION

Q1 What should be added to 4c(a+b+c) to obtain 3a(a+b+c)2b(ab+c)? (Ans: 3a2+ab+7ac+2b26bc4c2)

Q2 Subtract b(b2+b7)+5 from 3b28 and find the value of expression obtained for b=3. (Ans: b3+2b2+7b8; 16)

Q3 Verify the following

a) 3322 ))(( qpqpqpqp b) 22 )85(160)85( xxx

c) 26

7

7

3

6

7

7

322

p

p

p

p

Q4 Find the value of a if: a) 8a=352 272 (Ans: 62) b) pqa=(3p+q)2(3pq)2 (Ans: 12)

Q5 If p+q=12 and pq=22 then find p2+q2. (Ans: 100)

Q6 If xy=13 and xy=28 then find x2+y2. (Ans: 225)

Q7 If a2+b2=74 and ab=35 then find a+b. (Ans: 12)

Q8 Expand the following with suitable identities: a) (xy+yz)2 b) (x2yxy2)2 c) (2x+9)(2x7) d) (x2+y2)(x2y2)

Q9 Evaluate the following using suitable identities: (a) (52)2 (b) (98)2 (c) (9.9)2 (d) (10.1)(10.2) (e) (69.3)2(30.7)2 (f) 99.8 x 100.2

Q10 Factorise the following: (a) ax3bx2+cx (b) 4xy210x2y+16x2y2+2xy (c) x3y2+x2y3xy4+xy (d) x2+14x+49 (e) 4x2+12x+9 (f) 9x212x+4

(g) 424

2

xx

(h) y2+4y21 (i) a216p80 (j) 259

22 yx

Q11 Carry out the following divisions:

(a) 17ab2c3 (abc2) (b) (3pqr6p2q2r2) 3pr (c) (x222x+117) (x13)

(d) (x416) (x3+2x2+4x+8) (e) (3x41875) (3x275)


1

CHAPTER 13: DIRECT AND INVERSE PROPORTIONS

Q1 In a scout camp there is food provisions for 300 cadets for 42 days. If 50 more persons join the camp, for how many days will the provisions last? (Ans: 36 days)

Q2 If 45 persons can complete a work in 20 days, find in how many hours 75 persons can complete the amount of work. (Ans: 288 hours)

Q3 Devangi travels 50m distance in 75 steps, how much distance in km she travels in 375 steps? (Ans: 0.250km)

Q4 A contractor undertook a contract to complete a part of stadium in 9 months with a team of 560 persons. Later on, it was required to complete the job in 5 months. How many extra persons should he employ to complete the work? (Ans: 448)

Q5 A car covers a distance in 40 minutes with an average speed of 60km/hr. What should be the average speed to cover the same distance in 25 minutes? (Ans: 96km/hr)

Q6 If 25 meters of cloth costs `337.50, then a) What will be the cost of 40 meters of the same type of cloth? b) What will be the length of the cloth bought for `810/-?

(Ans: `540/-; 60m)

Q7 The cost of 27 kg of iron is `1080, what will be the cost of 120kg of iron of the same quality? (Ans: 4,800)

Q8 Ravi starts for his school at 8.20am on his bicycle. If he travels at a speed of 10km/hr then he reaches his school late by 8 minutes but on travelling at 16km/hr he reaches the school 10 minutes early. At what time does the school start? (Ans: 9.00am)

Q9 A water tank casts a shadow of 21m long. A tree of height 9.5m casts a shadow 8m long at the same time. Find the height of the tank. (Ans: 24.9m)

Q10 A bowler throws a cricket ball at a speed of 120km/hr. How long does this ball take to travel a distance of 20metres to reach the batsman? (Ans: 0.6sec)


1

CHAPTER 15: INTRODUCTION TO GRAPHS

Q1 Write the coordinates of all the points in the given graph.

Q2 Locate the points A(1,2), B(4.2) and C(1,4) on a graph sheet taking suitable axes. Write the

coordinates of the fourth point D to complete the rectangle ABCD.

Q3 Locate the point A(1,2), B(3,4) and C(5,2) on a graph sheet taking suitable axes. Write the coordinates of the fourth point D to complete a rhombus ABCD. Measure the diagonals of this rhombus and find if they are equal or not.

Q4 The graph below compares the sales of ice-creams of two vendors for a week.

Observe the graph and answer the following questions:

a) Which vendor has sold more ice creams on Friday? b) For which day was the sales same for both the vendors? c) On which day did the sale of vendor A increases the most as compared to the previous

day? d) On which day was the difference in sales the maximum? e) On which two days was the sales same for vendor B ?

Q5 The following table gives the growth chart of a child:

Height (in cm) 75 90 110 120 130

Age (in years) 2 4 6 8 10

Draw a line graph for the table and answer the following questions a) What is the height at the age of 5 years? b) How much taller was the child at the age of 10 than at the age of 6? c) Between which two consecutive periods did the child grow more faster?


1

CHAPTER 11: MENSURATION

Q1 The perimeter of a trapezium is 52cm, each of its non-parallel sides is equal to 10cm and its height is 8cm. Find its area. (Ans: 128cm2)

Q2 A metal sheet 27cm long, 8cm broad and 1cm thick is melted into a cube. Find the edges of the cube. (Ans: 6cm)

Q3 A bicycle wheel makes 500 revolutions in moving 1km. Find the diameter of the wheel. (Ans: 0.636km)

Q4 A river 2m deep and 45m wide is flowing at the rate of 3km per hour. Find the amount of water in cubic meter that runs into the sea per minute. (Ans: 45,000m3)

Q5 The capacity of a closed cylindrical vessel of height 1m is 15.4L. How many square meters of metal sheet would be needed to make it? (Ans: 0.07m, 0.44m2)

Q6 A rectangular examination hall having seats for 500 candidates has to be built so as to allow 4 cubic meters of air and 0.5 square meters of floor area per candidate. If the length of the hall be 25m, find the height and breadth of the hall. (Ans: h=8m, b=10m)

Q7 The ratio between the CSA and TSA of a right circular cylinder is 1:2. Find the ratio between the height and radius of the cylinder. (Ans: 1:1)

Q8 What will happen to a cubes volume if its edge is (a) tripled (b) reduced to one fourth?

(Ans: 27 times, 64

1times)

Q9 If 3 cubes of edge 10cm are joined edge to edge find the TSA of the resultant solid. (Ans: 1400cm2)

Q10 Find the area of the field. All dimensions are in metres.


1

CHAPTER 4: PRACTICAL GEOMETRY

Q1 Construct a rhombus whose diagonals are 8cm and 15cm. Find the measure of its sides.

Q2 Construct a rectangle ABCD in which AB=5cm and BC=3cm. In what ratio does the bisector of

C divide AB?

Q3 Construct a rhombus with side 4.5cm and diagonal 6cm.

Q4 Construct a quadrilateral ABCD, in which AB=AD=5cm, BC=CD=7cm and BD=6cm. What type of quadrilateral is this?

Q5 Construct a parallelogram ABCD in which AB=4cm, BC=5cm and B=60o.

Q6 Construct a trapezium ABCD in which AB||DC, A=105o, AD=3cm, AB= 4cm and CD=8cm.

Q7 Construct a rhombus whose side is 5cm and one angle is of 60o.

Q8 Construct a square of side 4cm.

Q9 Is it possible to construct a quadrilateral ABCD in which AB=3cm, BC=4cm, CD=5.4cm, DA=5.9cm and diagonal AC=8cm? If not, why?

Q10 Is it possible to construct a quadrilateral ROAM in which RO=4cm, OA=5cm, O=120o,

R=105o and A=135o? If not, why?


1

CHAPTER 10: VISUALISING SOLID SHAPES

Q1 State and verify the Eulers formula for cube, cuboid and tetrahedron.

Q2 A polyhedron has 7 faces and 10 vertices. How many edges the polyhedron has?

Q3 Find the number of vertices in a polyhedron which has 30 edges and 12 faces?

Q4 Which of the following cannot be true for a polyhedron? (a) V=4, F=4, E=6 (b) V=6, F=8, E=12 (c) V=20, F=12, E=30 (d) V=4, F=6, E=6

Q5 Write another name for the following solids: (a) Square prism (b) Rectangular prism

Winter Vacation Assignment Dec. 2016

Class-VIII

Physical Education Project

Topic-Rio Olympic

Holiday Homework

Physics

Class -8

Chemical Effects of Electric current

Do the question answer in your physics notebook

1. In order to obtain a coating of silver metal on a flower vase made of copper the

electrolyte has to be:

(a) Silver nitrate solution.

(b) Copper nitrate solution.

2. Which of the following objects should not be chrome plated?

(a) Bicycle bell

(b) Frying pan

3. Name two liquids which conduct electricity and two liquids which do not conduct

electricity.

4. How would you classify lemon juice: a good conductor or a poor conductor of

electricity.

5. Give list of 4 objects around you which are electroplated.

6. The passage of an electric current through a conducting solution causes

_______effect.

7. The process of depositing a layer of any desired metal on another metal by means of

electricity is called___________________.

8. If you pass current through copper sulphate solution, copper gets deposited on the

plate connected to the ________________ terminal of the battery.

9. A student staying in a coastal region tests the drinking water and also the sea water

with a circuit in which a part of the connecting wire is wound around a match box

containing compass. He finds that the compass needle deflects more in the case of sea

water. Can you explain the reason ?

10. A student had heard that rainwater is as good as distilled water, so he collected some

rainwater in a clean glass beaker and tested it. To his surprise he found that the

compass needle showed deflection. What could be the reason?

Some Natural Phonomena

1. Lightning is nothing but an ____________________ spark.

2. Each fragment of earths crust is called a ____________.

3. The charging of an object by rubbing it with another is called charging by

__________________.

4. Combing your hair makes a ________________charge on the comb.

5. For what purpose is Richter scale used?

6. Name the scientist who showed that lightning is electric in nature.

7. A glass rod is rubbed with a silk cloth. What type of charge is acquired by (a) silk

cloth (b) glass rod.

8. What are the two kinds of electric charges?

9. An earth quake measures 3 on Richter Scale:

(a) would it be recorded by a seismograph?

(b) Is it likely to cause much damage?

10. What will you observe when the metal top of an electroscope is touched with

(a) A positively charged object?

(b) A negatively charged object?

Social Science

Class 8th

(TERM-2)

History 4 chap-8

Civilizing The Natives educating the Nation;-

1. Who came to be called orientalists ?Name two renowned orientalists.

2. Why did James Mill want western education in India ?

3. write a brief note on William Jones.

4. Explain briefly why the Anglists and Orientalists disagreed ?Who finally won?

5. In what ways did the British hope to benefit by giving the Indian western education?

6. When was Shantiniketan established ? what were children taught in this abode of

peace?

7. Write in your own words about vernacular schools ?

8. What were the change made in the curriculum of vernacular education after 1854?

what were its effects?

9. Why was Mahatma Gandhi critical of English Education?

10. How was the concept of National Education of Mahatma Gandhi different from that of

Rebindranath Tagore?

History

Chap-II THE MAKING OF THE NATIONAL MOVEMENT : 1870S-1947:-

1 Why were the people dissatisfied with the British rule in 1870and 1880s ?

2 Give two reasons of the rise of radicals in the congress.

3 Explain how were the ideas and policies of the Radicals within the congress different

from that of the moderates.

4 When and by Whom was the Muslim League established? What was its objective?

5 Outline the main Demands of Moderates.

6 Write briefly about Swadeshi and Boycott.

7 How did Gandhiji break the Salt Law?

8 When was Purna Swaraj declared by Indian National Congress?

9 When and Why did Simon Commission come to India ?

10 State the purpose of Khilafat Movement.

TERM-II CIVICS

CHAPTER:5- JUDICIARY

1. Explain India has a Single Integrated Judiciary.

2. Why is the Supreme Court called the guardian of the constitution?

3. How is Independence of Judiciary ensured?

4. How has Public Interest Litigation ensured speedy Justice? Mention 2 purposes for which

P1L may be filed.

5. How did the Supreme Court come to recognize the right to food as part of right to life?

6. Distinguish between civil and criminal cases.

7. Briefly describe how a case moves from a subordinate court to the highest court.

8. Name the present chief justice of India.

9. What do you understand by judicial review?

10. Explain Independence of the Judiciary.

CHAPTER:5- UNDERSTANDING OUR CRIMINAL JUSTICE SYSTEM

1. Distinguish between FIR and Charge sheet.

2. Who is a Public Prosecutor? What is his role?

3. How has the constitutions tried to ensure that a person unable to bear the cost can exercise

the right to be defended by a lawyer?

4. When is a trial considered fair?

5. Article 22 of the Indian constitution guarantees certain rights to every arrested person.

Name them.

6. Name the procedures which the police has to observe at the time of arrest, detention and

interrogation of a person.

7. In a trial, what is the role of a judge?

8. Explain the terms- Eviction and Conviction with reference to judiciary.

9. Give the role of Police in investigating a crime.

10. Why is it important for a judge to act impartially in the court of law?

CHAPTER:9- PUBLIC FACILITIES

1. What is a Public Facility?

2. Why should the government take the responsibility of supplying Safe Drinking water?

3. According to urban water commission how much water is needed by a person in a day?

4. How do the middle classes and rich people cope up with shortage in water supply?

5. Why are the private companies reluctant to provide public facilities?

6. When does the money for maintaining sulabh public toilets usually come from?

7. Write about the work done by sulabh in India.

8. The government should not completely privatise the system of providing any public facility.

Justify their statement.

9. How do the people of Porto Alegre take part in managing their citys water supply and

sanitation?

10. Do you think it is important to conserve resources like water and electricity? give some

ways for their conservation.

CHAPTER:10- LAW AND SOCIAL JUSTICE

1. Mention one way in which union carbide had tried to reduce costs in its Bhopal plant.

2. Why is the value of a worker low in India?

3. Give two reasons why many survivors of the Bhopal has tragedy feel that they have not got

justice.

4. What shows that the government did not apply industrial laws strictly in case of the union

carbide plant in Bhopal?

5. What is the minimum wage Act? Who sets the minimum wage?

6. Compare the condition of worker in organized and unorganized sector.

7. Explain the right against Exploitation.

8. Name any three MNC working in India. What do they manufacture?

9. Name any three Indian companies which are working in foreign countries.

10. What are the new laws for the protection of environment? How can environment

degradation be controlled?

GEOGRAPHY (2nd

term)

CHAPTER-4

AGRICULTURE

1. Give geographical terms for the following :-

i. Domesticating animals and moving with them in search of search of fodder and

water ______________.

ii. Cultivation of crops and reasing of livestock done on the same load ____________.

iii. Growing crops without use of chemicals____________.

iv. Genetic modification of seeds to make them were resistance to

diseases_____________.

2. Explain the following:-

i. Nomadic heading.

ii. Shifting agriculture

iii. Mined forming

iv. Plantliok agriculture.

3. Distinguish between:-

i. Secondary and testiary culltoties.

ii. Commercial grain farming and plantation agriculture.

iii. Periculleese and pisciculare

iv. Define agricultural development? How cant be achieved.

v. How is an Indian former different than a farmer of US?

CHAPTER-5

INDUSTRIES

1. Give 2 examples of the following in the space provided:-

i. Raw materials ______________ and _______________.

ii. End produces ________________and ______________.

iii. Jactiary aetioties _______________ and ____________.

iv. Ageo based industries _________ and __________.

v. Cottage industries _____________ and _______________.

vi. Cooperatives _____________ and _______________.

2. Distinguish between the following:-

i. Ageo based and mineral based industing.

ii. Public sector and joint sector industry.

3. Explain the leather manufacturing and industry with examples.

4. What is an industry system? Explain the different aspects of on industrial system are

examples.

5. What are the upits, processes and oil puts of leon and steel industry?

6. What do you understand by the term inprention lichaology?

7. Classify the industries on basis of low materials used, their size and shipwrite examples.

8. Explain the factors which influence the location of industries?

9. Why are leon and steel important for the growth of heodex calization?

10. Why is ahmedabad referred to as the Manchesles of India?

CHAPTER-6

HUMAN RESOURCES

1. Give geographical terms for the following:-

i. The numbers of two breaks per 1000 people____________.

ii. The number of deaths per 1000 people ______________.

iii. Movement of people within and in and out of a country _________.

iv. People who house to broke country.

v. The difference between birth rate and death rate ______________.

2. Answer the following question:-

i. Describe the distribution of population in the world.

ii. List the geographical factors that are responsible for the distribution of population.

iii. Explain population explosion.

iv. Why are lives valleys densely populated?

3. Why developing countries have high rate of population growth?

4. Write a short note on change of population?

5. What is the difference in the population pyramind between a developed and an

underdeveloped country?

6. Explain the factors which affect the distribution of population?

7. Define density of population , birth rate , death rate, actual population growth, age

composition sex ratio.

8. Why do you think people mostly migrate from rural to urban areas.

9. Why do you think human beings are considered a resource?

10. What are the objectives of Human Resource Development ministry? Who is the called HRD

Minister?

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chemistry holiday homework (2016 - 17) - laxman...

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