LAKSHMI SCHOOL, MADURAI PRACTICE SHEET- ENGLISH – Class VIII

I. Read the given passage and answer the questions below: Tintin, the comic Hero A comic is a magazine that tells stories through pictures. A comic strip is a series of drawings that tell a story, especially in a newspaper or weekly. Children as well as adults enjoy reading comics like the Amar Chitra Katha, Tintin stories, Superman and others.

THE ADVENTURES OF TINTIN continue to interest and fascinate his fans many decades after this irrepressible comic hero first appeared in print on January 10, 1929. The creation of the Belgian author Herge, whose real name was Georges Prosper Remi, Tintin is one of the most recognised and best-loved fictional characters and perhaps Belgium’s most famous icon. Although essentially a comic-strip character, Herge knew the importance of accurate research and took care to place Tintin in a real and believable world. Clippings from magazines, visits to museums, consultation with experts, all contributed to the successful shaping of his lovable character. An adolescent with no known family, this enduring character is a journalist, an adventurer and a detective all rolled into one. The round-faced, dotty-eyed reporter has only one distinctive feature: the celebrated quaff. The Brussels newspaper, Le Vingtieme Siecle introduced Tintin in a comic supplement and he hasn’t looked back since. The intrepid, ageless reporter has had an uncanny knack of surfacing at just the right moment in international crises. Along with a supporting cast led by his faithful dog Snowy, Captain Haddock, and the eccentric Professor Calculus, Tintin battles good-for-nothings of all stripes, spies, drug-runners, mad scientists and Latin American guerrillas. The boy-reporter’s first adventure was Tintin in the Land of the Soviets, and he exposed the Soviet propaganda and put the communists in their place. From this debut, he went on to be present at the Japanese invasion of China in the 1930s, to get embroiled in an oil crisis in the Middle East. Before trekking to the capital of crime, Chicago, he was in Belgian Congo in Africa. He even went on a voyage to the moon, 15 years before Neil Armstrong landed on the moon aboard Apollo. It is a familiar sight in these comic strips to see Tintin grabbing his coat to chase another adventure with his trusted Snowy in tow. From villainous drug smugglers at sea to expeditions to the North Pole, and searching for sunken treasures in the Caribbean, Tintin and his gang have escaped the jaws of death many times. Courageous, ingenious, modest and practical, Tintin never hesitates to confront the forces of evil and protect the weak. The breathless career of this young journalist, with his cowlick hair, has taken him all over the world in 23 of his comic adventures. With his exploits, the dashing reporter conquered the hearts of readers of comics and generated a legion of Tintin fans across the world. The Tintin books have been translated into more than sixty languages. The last adventure was left unfinished on Herge’s death in 1983. This favourite hero hasn’t chased any new adventure after the demise of his creator, but Tintin lives on in an endless stream of Tintin T-shirts, watches and mugs. The fact of the matter is that although Tintin’s last completed adventure appeared in 1976, he is more alive today than ever before. A silver 10-euro coin depicting Tintin and Snowy was minted specially for the 75th anniversary in 2004, in honour of this endearing comic character. The American director Steven

Spielberg made the animated film The Adventures of Tintin in 2011, which became a hit across the world. I. Choose the correct synonym for the given word; (5) 1.testimony a) trial b) belief c) invent d) evidence 2.. Strike out what is not true. (1) a) Tintin is essentially a comic-strip character. b) Tintin is one of the most recognized and best-loved fictional characters. c) Tintin is England’s most famous icon. d) Tintin is a journalist. 3. How did Herge add a touch of realism to his comic character? (2) 4. Why do you think people like Tintin? (2) 5. a) Use the appropriate prefixes: - (3) 1. legal – ( de / il / in) 2. patient – (un / im / anti) 3. understand – (ir / non /mis) 6. In not more than 50 words summarize the character sketch of Tintin. (8) II. Choose any one of the essays in not more than 300 words: - (10) 1. Describe an incident in which you have learnt a lesson on the value of punctuality. OR 2. Imagine that you have changed your school recently Narrate your experience on your first day in the new school. How did you feel at the end of the day? III. Choose any one of the letters: - (10) 1. A friend of yours has been out of station for a month and there was an important event / function held in the school while he / she was away. Write him / her a letter describing the event / function, and your role in it, and why your friend was missed. OR 2. You have accidentally left your suitcase behind when you got off the train. You only realised it after the train left the platform. Write a letter to the station master reporting your loss and request that the suitcase be located and kept till you claim it. IV.GRAMMAR A. Choose the right article and fill in the blank: - (1) a) A: What’s wrong? B: I have ________ bad headache. (a / an /the) b) A: Why was today’s class cancelled? B: It was cancelled because ________ teacher is sick. (a / an / the) B. Pick out the correct preposition and fill in the blanks: - (1) a) You shouldn’t pick _______ him just because he’s different. (on / to /with)

b) _______ the year, I’ve spoken to her five times. (in /during /throughout) C. Change the following sentences according to the given instruction: - (3) a) Shakespeare is the most famous of all writers in English. (Use: more famous) b) Air is lighter than water. (Use: light) c) Very few boys in the class are as strong as Shyam. (Use: strongest) D. Do as directed: - (6) a) We had not even walked one kilometre when they stopped us. (Begin: Hardly...when) b) The memory is so vivid that I cannot forget it. (Use: too...to) c) As soon as she sang a song, the audience applauded. (Use: No sooner...than) d) He came late to school. He forgot to submit his project. (Use: Not only...but also) e) No sooner does the bell ring than the children run out. (Begin: As soon as…) f) Ravi was too tried to travel. (Use: so...that) E. Choose the right option: - (3) 1. The child is eating cakes. Cakes ___________ by the child. a) are eaten b) are being eaten c) have been eaten d) is eaten 2. The master punished the servant. The servant ________ by the master. a) is punished b) was punished c) has punished d) had punished 3. May God bless you with happiness. ___________ with happiness. a) May you blessed b) May you be blessed c) May blessed you be d) May you are blessed F. Identify the speech of the given sentences and convert each to the other : - 1. He said, “The film began at seven o’clock.” 2. “Does she know Robert?” he wanted to know. 3. The stuntman advised the audience not to try that at home. 4. She exclaimed that the weather was too hot. G. Choose the correct verb that agrees to the subject: - 1. Nobody (know /knows) the trouble I’ve seen. 2. The committee (debates / debate) these questions carefully. 3. The players, as well as the captain, (want / wants) to win. 4. All of the photos, even the scratched one, (are / is) in the case. ____________________________________________________________________________________

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1 2 3 4 5 6

mar

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bta

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Tests

Marks obtained by Mohit and Rahul

Mohit marks

Rahul marks

LAKSHMI SCHOOL MATHEMATICS PRACTICE SHEET -1 CLASS - VIII

Question 1 a) Anchal bought a second hand car for ₹ 2,25,000 and spent ₹ 25,000 for its repairs. If she sold it for ₹ 3,25,000.What is her profit percent? b) (i) Find x and y in the given figure. 16 𝑐𝑚 . 2𝑥 18 𝑐𝑚 2𝑦 − 6

(ii) In a quadrilateral PQRS,50=P ,

50=Q , 60=R .Find .S

Is this quadrilateral concave or convex? c) The volume of a cylinder is 6358 m3 and its height is 7m. Find its radius and curved surface area. Question 2 a) Solve and find the value of a :

1127

11

6

11

6

11

6−

=

a

b) Using identities, factorize the following polynomial:

(i) abba 4)( 2 −+ (ii) 24102 ++ xx

c) Construct a quadrilateral ABCD where AB=5 cm, BC=4.6 cm, CD= 3.9 cm, AD= 2.8 cm and AC= 6.2 cm Question 3

a) Calculate the amount on a sum of ₹ 30000 at the rate of 8% per annum for 2 years, interest is compounded annually.

b) The graph given above represents the marks obtained by Mohit and Rahul in six different math tests conducted during a month.

(i) What was the mark obtained by Mohit in Test 4? (ii) In which test did they score equal marks? (iii) Who has shown consistent performance? Give reasons for your answers.

c) Solve and find the value of 𝑥: 2

1

5

3

2

5=

−−

− xx

Question 4

a) Simplify )2(3)4(2 2 ++− xyxyx and hence find its value for 5&0 == yx .

b) . 14m Find the area of the unshaded portion. 16 m c) The types of vehicles visiting a petrol bunk during one day are given below. Represent the given data in a pie chart.

Types of vehicles

Car Truck Bus Train

No. of vehicles

26 12 8 14

Question 5 a) (i) Two sticks each of length 7cm are crossing each other such that they bisect each other at right angles. What shape is formed by joining their end points? Give reason. (ii) How many non- overlapping triangles can we make in a pentagon by joining its vertices?

b) If A = zyx 15115 −+ , B = zyx 191312 −+ , C = zyx 2167 −+ . Find A+B - C.

c) The sum of the present ages of a father and son is 66 years. After 3 years, the father’s age will be thrice the son’s age. Find their present ages. Question 6 a) The area of the base of a right circular cone is 525 sq.m and its height is 8cm. Find its volume.

b) Verify 22 )85(160)85( −=−+ xxx

c) Draw a linear graph for the following:

Question 7 a) Write the greatest common factor in each of the following terms:

(i) aa 64,8 2−

(ii) )4(),16( 2 −− yy

(iii) )7(),426( −− xx

b) Lemons were bought at ₹ 48 per dozen and sold at the rate of ₹ 50 per 10.Find gain or loss percent.

c) A cuboidal tin opened at the top has dimensions 20 cm 16 cm 14 cm. What is the total area of metal sheet required to make 10 such boxes? Question 8

a) Find the third side of a triangle whose perimeter is )777( 2 −+ xx and the two sides are )565( +x

and )136( 2 −+ xx

b) Fill in the blanks.

(i) The multiplicative inverse of 10010− is ____

(ii) The standard form of 10000000

1 is ____

c) Compute the compound interest on ₹12,000 for 1½ years at 10% per annum compounded half yearly.

Question 9 a) The perimeter of a rectangular garden is 38 m and its area is 60 m2. What are the dimensions of the garden ?

A. 6m 10m B. 2m 30m C. 3m 20 m D.4m 15m

Side of equilateral triangle (in cm)

2 3 4 5 6

Perimeter (in cm)

6 9 12 15 18

60=P

b) If we add

−

2

3to a number and multiply it by

2

5, we obtain

8

3. What is the number?

c) Evaluate 6.5

25.125.175.475.4 − using suitable identities

Question 10

a) Divide )4925(27 22 −yy by )75(9 2 +yy

b) Solve and find the value of m: 12

5

23

55

555=

−

−m

c) The marked price of an article is ₹ 500. The shopkeeper gives a discount of 5% and still makes a profit of 25%. Find the cost price of the article.

Question 11 a) A photo frame is in the shape of a quadrilateral. If one diagonal is longer than the other, then what shape you get? Give reason. b) Construct a parallelogram PQRS where PQ = 4 cm, QR = 5 cm and c) The weight (in kg) of 30 students are given below. Make a histogram for the given data using class intervals 30 - 35, 35 - 40 and so on .

Question 12 a) Which of these numbers is the largest? A) 4.2 × 105 B) 2.568 × 106 C) 3.7 × 109 D) 3.89 × 107

b) Draw a circle of radius 3 cm and draw its diameter and label it as AC. Construct its perpendicular bisector and let it intersect the circle at B and D. What type of quadrilateral is ABCD? Justify your answer. c) The pocket money of Ishan and Raghav are in the ratio of 5 : 7. If the pocket money of both of them is increased by ₹ 225, the new ratio will be 3: 4. Find the pocket money they get.

41 30 53 51 54 43 56 54 56 43

51 32 54 52 58 38 42 45 33 49

48 37 53 35 41 49 49 50 51 55

LAKSHMI SCHOOL MATHEMATICS PRACTICE SHEET -2 CLASS - VIII

QUESTION - 1

(a) A brigadier wants to arrange 5776 soldiers in rows in such a way that number of soldiers in each row is same as the number of rows . Find the number of soldiers in each row. (b) Bananas are bought at the rate of 4 for ₹.3. At what rate must they be sold to gain 20%? (c) Find the product of (10x2 – 2x + 1) and (5x + 3).

QUESTION - 2

(a) In a boarding house, there are provisions for 90 boarders for 40 days. If 10 boarders leave the boarding house, how many more days will the provisions last ? (b) Shyama bought a watch on the occasion of Diwali for ₹.728 at a discount of 9%. Find the marked price of the watch. (c) Evaluate 4982 using identity.

QUESTION - 3

(a) Nikhil borrowed ₹. 64,000 from a bank for 1 ½ years at the rate of 10 % per annum. Compute the compound interest payable by Nikhil after 1 ½ years, If the interest is compounded half yearly. (b) In a one day cricket match, M.S.Dhoni scored 40% of the runs scored by his team. If he scored 128 runs, what was the score of the team?. (c) (i) Evaluate : 9-1 + 30 + 6-1 (ii) Write the standard form of 0.00000832

QUESTION - 4

(a) A shopkeeper sells two sarees for ₹.1200 each. He earns a profit of 20% on one and suffers a loss of 20% on the other. Find his total profit % or loss % on the whole deal. (b) A rectangular copper block of dimensions 45 cm x 20 cm x 15 cm is melted and made into cubes of each having the edge 5 cm. Find the number of cubes. (c) Factorise ax + bx – ay – by QUESTION - 5

(a) The population of a city increased from 80,000 to 85,400 in 1 year. What is the increase percent of the population of the city? (b) If 711 ÷ 75 = 7-3 x 72p – 1 , find the value of p.

QUESTION - 6

(a) Find the product of ( )xyz9 and 2

3

1

xyz and verify the result for x=2, y=1, z=3.

(b) A trapezium whose parallel sides are 6cm and 11cm has an area of 34cm2. Find the altitude of the trapezium. (c) 5 machines together can make 250 garments in 18 hours. If 3 more such machines are installed,

in how many hours can 250 garments made?

QUESTION - 7

(a) A number is selected randomly from the numbers 1,2,3,4,………..15. Find the probability of getting (i) an even number. (ii) an odd number. (iii) a prime number. (iv) a two digit number. (b) Two diagonals of a rhombus are 18cm and 24cm. Find the area and side of the rhombus. (c) Divide 2a2 + 11a + 12 by (a + 4)

QUESTION - 8

(a) A water reservoir is 22m long, 16m broad and 10m high. Find the (i) cost of cementing its floor at a rate of ₹.30 per m2. (ii) painting the four walls at the rate of ₹.19 per m2.

(b) Find the cube root of3375

343

(c) The perimeter of a parallelogram is 50cm. one side is 1 ½ times the other. Find the sides of the parallelogram QUESTION – 9 (a) The denominator of a fraction is 12 more than the numerator. If 16 is added to both the numerator and denominator, the new fraction so obtained is 10/ 13 . Find the original fraction. (b) Find the sum of interior angles of an octagon. Also find the measure of each interior angle. (c) Find the product of 52 and 48 using identities. QUESTION – 10 (a) The table below gives the weight of a man at different ages.

Age(years) 4 6 8 10 12 14 16 18 20

Weight (kg) 20 25 35 40 45 55 60 65 70

Draw a line chart to represent the above data. Estimate from the graph, the weight of the man when he was 9 years old. (b) Solve: 18 – 3(x – 2) = x + 8 QUESTION – 11 (a) Draw a pie chart to represent the following data of a school.

Mode of transport Number of students

Train 120

Bus 160

Tram 40

Car 60

Bicycle 20

QUESTION – 12 (a) Construct a Rhombus whose diagonals are of 6cm and 7cm. (b) A man is five times as old as his son. In two years time, he will be four times as old as his son. Find their present ages. (c) Find the other 2 members of the Pythagorean triplet, one of whose members is 20. QUESTION – 13 (a) Construct a quadrilateral ABCD such that AB = 4.2cm, AD = 5cm, CD = 6cm, A = 600 and B = 1200 (b) In the given figure, ABCD is a trapezium ofD = 880 . Find the values of x and y.

REVISION

SUBJECT PHYSICS CLASS VIII

I. Choose the appropriate answer. 1. The light rays are get ----------------------------- by plane mirrors and ------------------- by a glass slab.

a) reflected , reflected b) refracted ,reflected c) reflected , refracted

2. When we polish a spherical mirror on the -------------- side, do we get a convex mirror

a)inner b) outer c) both

3) When rays of light are refracted by a glass prism, they are-------------------------

a) bent twice away from the its base b) bent twice towards the base

c) once bent away from the base and once towards the base

4. Select the substance which does not undergo sublimation (a) Common salt (b) Naphthalene (c) Ammonium chloride (d) Camphor

5 The external factor which do not affect vapourisation is _______________

a). Temperature b). Humidity c). Wind Speed d). none of these

6. The reverse process of evaporation is -------------------------

a) fusion b) condensation c) solidification d) deposition

7) Sinking and floating depends on -------------

a) amount of water displaced b) density of an object c) density of water d) all of these

8) Dense air move towards the surface of the earth due to------------------

a) convection current b) wind in the atmosphere c)ocean current d) both a and b

9) The scientist who invented the simple barometer is-------------

a) Pascal b) Newton c) Torricilli d) Galileo

10) The device that does not use atmospheric pressure for its working is -------------

a) syringe b) medicinal dropper c) crane d) water pump

11) Burning of meteors in the atmosphere is due to ---------------------- force

a) electrostatic b) magnetic c) gravitational d) frictional.

12. The pressure exerted at any point on an enclosed liquid is transmitted equally in all directions is

stated by -----------------------

a) Alexander b) Pascal c) Boyle d) Charles

13. A body weighing 400g wt is dipped in water. Its weight in water as indicated by the spring balance

is 350 g wt. The buoyant force acting on the body is

a) 400g wt b) 350 g wt c) 50 g wt d) 250 g

14. The image formed by a concave lens is ________.

a) always real and enlarged b) always real and diminished

c) always virtual and enlarged d)always virtual and diminished

15. Which form of electric discharge appears in nature?

a) rain b) ocean currents c) lightning d) volcanoes

16. A negatively charged body has -------------------

a) excess of electrons b) deficiency of electrons

c) no change in the number of electrons d) none of

17. The volume of irregular solids can be determined using__________

a) Standard formulae b) water displacement method c) Lactometer d)

density bottle

18 Density of an iceberg is __________ water.

a) more than b) less than c) double than d) equal to

19.Camels exert less pressure on the sand because they ______.

a) are light in weight b) cannot exert much force c)have broad feet d) can

exert much force

20. Moment of force is calculated by

a) M=F+d b) M=F/d c) M=Fxd d) M = d/F

21. Which of the following is used as a rear view mirror in automobiles?

a)concave mirror b) convex mirror c)plane mirror d)none

of the above

22 Which colour suffers maximum bending in the spectrum of white light during dispersion?

a) Yellow b) Green c)Red d)Violet

23 joule= _______ calories.

a)1000 b)1/4.2 c)4.2 d)1/1.24

24. An alloy which expands very little on heating is__________

a) invar b)steel c) nichrome d)brass

25. What helps in saving tall buildings from the harmful effects of lightning?

a) Charging b)Earthing c) Electrification d) none of

the above

26. Which of the following protects the gold leaves from air currents in a gold leaf electroscope?

a) Brass rod b)Wooden base c)Glass jar d) Insulator

plug

Fill in the blanks with a suitable word or words to complete it properly:- 1. Charging by _______ is possible only for conductors and not for insulators.

2. A solid made up of iron will expand ______ than the solid made up of brass for the same rise in

temperature.

3. When the object is at infinity, its image is formed at the ______ of the concave mirror.

4. The force exerted by a force of 1 N acting over an area of 1 m2 is ________.

5.The buoyant force experienced by a body when floating in salt water is __________ that when floating

in pure water.

6.The geometrical centre of a spherical mirror is called ----------------------- 7 If the focal length of a concave mirror is 16cm , then its radius of curvature is ---------------- cm. 8.When a ray of light travel from a rarer medium to denser medium it bends ---------------------- 9. Physical properties that differentiates one substance from another is called _____

10. The density of a substance with respect to the density of water at 4°C is called_____

11. If the density of iron is 7.2 g/m3.Then its value in kg/m3 is ______

12.. A body partially or fully immersed in a liquid, experiences an upward force that is equal to the

weight of the liquid displaced by it and this principle is known as ______

Answer the following:- . 1 Name the medium A and B and trace the path of the light ray when it travels from medium B to A. A 2.Give reasons The sun is seen before the actual sun rise. 3.State the laws of refraction. 4 Differentiate between refraction by a prism and by a rectangular glass slab. 5. Convex mirror is used as a rear view mirror in an automobile. Why?

6. State the principle of floatation.

7. Explain, how heavy objects are able to float in water.

8. Give reason. The lower end of hydrometer is filled with lead shots. Why. ?

9. In new system of measurement, length is measured as ‘X’ and mass is measured as ‘Y’. Find the unit

of density in that system.

10. How is convection current formed?

11. The boy ‘X’ weighs 600N sits 1.5 m away from the pivot of see-saw. An another boy ‘Y’ weighs 500N sits 2m away on the other side of the board. Find which side of see-saw will moves down.?

12. The pressure between the tyre and the road is 200000 Pa. If the weight of the bus is 2000 N. Find the area of contact between the tyre and road.

13. Distinguish between force and pressure.

14. Write any two characteristics of liquid pressure

15. Give reason. Deep sea divers have to wear special suits.

16. State the two factors which change the turning effect.

17 The mode of transfer of heat in liquid ..

18. An instrument used to measure atmospheric pressure.

19. The image that cannot be taken on a screen.

20. The method of charging an object without touching it with another charged object.

21. The instrument that is used to find the type of charge present in a body .

22 Draw a labelled diagram of gold leaf electroscope.

23. Observe the images and answer the questions given below.

a) What kind of thermal expansion takes place in the above diagram? b) Write the relationship between α, β, γ c) Give two applications of thermal expansion you come across in daily life. 24. The diagram given below shows two parallel rays 1 and 2 incident on (a) concave mirror and (b)convex mirror. Draw the reflected rays and mark the focus.

25 Trace the path of the ray of light as it gets refracted through the prism after drawing the normal. Mark

the angle of incidence, the angle of emergence and the angle of deviation.

2 6 Draw a ray diagram of a concave mirror when an object is placed at C and write the position , size and the nature of the image 27 Explain the term Principal focus of a concave lens with the help of ray diagram.

28. Mr John is very fond of observing and studying about nature. He decided to study the following.

i) A small leaf of a tall tree.

ii) Organisms present in the human blood.

iii) A very old book on nature with very small –sized writing

Which optical instrument should John use for each of the above?

29 Draw a ray diagram to show refraction of light through a rectangular glass prism. And state the laws of

refraction used in it.

30. What happens when a ray of light is incident normally on one of the faces of a rectangular

glass slab? Support your answer with the help of diagram.

LAKSHMI SCHOOL, MADURAI

PRACTICE SHEET

VIII- CHEMISTRY

I. Choose the correct answer:

1.The forms of carbon which can be used to produce water gas is

a. Coke b. Bone charcoal

c. Lampblack d. Gas carbon

2. The mass no. of chlorine is 35, and its atomic no. is 17, the electronic configuration is

a. 2,8 b. 2,8,7 c. 2,7,8 d. 2,6,9

3. Manu prepared an aqueous solution of CuSO4 and AgNO3 in beakers X and Y. She then

dropped some Iron pieces in beaker X and Copper pieces in beaker Y. After 10 hours she

observed that the solution in X and Y respectively appear.

a. Colorless and light blue b. Colorless and pale green

c. Greenish and Colorless d. Green and Blue

4. Nitrate is a ___________ ion.

a. Mono atomic anion b. Mono atomic cation

c. Poly atomic cation d. poly atomic anion

5. Copper oxide and Sulphuric acid reacts to form

a Sulphur –di-oxide, and oxygen b. Copper Sulphate and Oxygen

c. Copper , hydrogen, oxygen d. Copper Sulphate and water

6. Which among the following represents Buckminster fullerene

a. C32 b. C50 C. C60 D.C70

7. Hydrogen chloride gas is formed when hydrogen gas combines with chlorine in the presence

of ____________

a. Direct Sunlight b. Diffused Sunlight c. In the dark d. Oxygen

8. Which of the statements about the reaction below are incorrect?

2CuO + H2 → 2Cu + H2O

i. Copper is getting reduced. ii. Water is getting oxidized

iii. Hydrogen is getting oxidized iv. Copper oxide is getting reduced

a. I and ii b. I and iii c. I, ii and iii d. All of these

9. Gas which is collected at anode when water is electrolyzed

a. H2 b. O2 c. He d. Cl2

10. The form of carbon which is in Kajal

a. Gas carbon b. lampblack c. Charcoal d. Coke

II. Name the following :

1. The element that has two sub atomic particles.

2. A base that is soluble in water.

3. The compound formed by the reaction between haemoglobin and carbon monoxide.

4. The reaction which involves addition of hydrogen and removal of oxygen.

5. Electrons present in the outermost shell of an atom.

III. Complete the table

Element

Atomicnumber (Z)

Mass number (A)

No. of protons (p)

No. of electrons(e)

No of neutrons (n)

Carbon 6 --- 6 --- 6

Boron --- 11 5 5 ---

Aluminum 13 --- --- 13 14

Argon 18 40 18 --- ---

---------- 11 23 --- 12 11

IV. Answer the following

1. Valency of calcium is 2, write the formula for calcium chloride, calcium phosphate, calcium

oxide, calcium hydroxide.

2. What is catenation?

3. a) What type of gas will be evolved when a carbon compound undergoes incomplete

combustion. ?

b) How does it reduce zinc oxide to zinc?

4. Identify the acidic, basic, neutral and amphoteric oxides from the following

K2O, CO2, CO, PbO,

5. Arrange the following elements in the decreasing order of reactivity

Al, Fe, Zn, Au, K, Mg, Cu, Ag

6. How will you obtain?

a. Ammonia from nitrogen b. Zinc chloride from zinc

7. Draw the electronic configuration of a. Nitrogen b. Potassium

8. Why should not we use dilute H2SO4 in the preparation of carbon dioxide from calcium

carbonate?

9. Why is graphite used in making crucibles?

10. Diamonds have extraordinary brilliance. Give reason.

11. What is the composition of bone charcoal?

12. Which allotrope of carbon is used as a catalyst in certain chemical reactions?

13. What makes graphite to conduct electricity?

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

5. Arrange the following elements in the decreasing order of reactivity

Al, Fe, Zn, Au, K, Mg, Cu, Ag

6. How will you obtain?

a. Ammonia from nitrogen b. Zinc chloride from zinc

7. Draw the electronic configuration of a. Nitrogen b. Potassium

8. Why should not we use dilute H2SO4 in the preparation of carbon dioxide from calcium

carbonate?

9. Why is graphite used in making crucibles?

10.Diamonds have extraordinary brilliance. Give reason.

11. What is the composition of bone charcoal?

12. Which allotrope of carbon is used as a catalyst in certain chemical reactions?

13. How is graphite diferrent from diamond in conducting electricity

14. Write the difference between adsorption and absorption.

15.Rahim was doing an experiment with hydrogen, he passed the gas over a non metal

which is yellow in colour. After some time he noticed a rotten egg smell.

a)Identify the non metal. b)What is the reason for the smell?

c) Write the chemical reaction.

V. Balance the following equations

1. Zn + NaOH → Na2ZnO2 + H2

2. Pb(NO3)2 →PbO + NO2 + O2

3. KClO3 →KCl + O2

4. P + O2→ P2O5

5. Al + HCl → AlCl3 + H2

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14. How to prepare bone charcoal?

15.Rahim was doing an experiment with hydrogen, he passed the gas over a non metal

which is yellow in colour. After some time he noticed a rotten egg smell.

a)Identify the non metal. b)What is the reason for the smell?

c) Write the reaction.

V. Balance the following equations

1. Zn + NaOH → Na2ZnO2 + H2

2. Pb(NO3)2 →PbO + NO2 + O2

3. KClO3 →KCl + O2

4. P + O2→ P2O5

5. Al + HCl → AlCl3 + H2

LAKSHMI SCHOOL,MADURAI – 20 . STD : VIII BIOLOGY

REVISION –PRACTICE SHEET

I. Name the following 1. The flower that bears both the male and female part 2. The stage of life when the body becomes capable of sexual reproduction after attaining sexual maturity. 3. A bundle of neurons. 4. Mass of undifferentiated cells. 5. Male or female reproductive sex cells 6. The period between fertilisation and birth. 7. The chemicals secreted by the endocrine glands. 8. The mental tension or worry caused by problems. 9. The valve present between left auricle and left ventricle. 10. All animals domesticated by human beings for their usefulness. II. How would you describe the following : 1. Immunity 2. Organic farming 3. Congenital disease. 4. Hybridization. 5. Implantation III. Choose the correct answer: 1. Which of the following is not an underground stem? (a) corm (b) bud (c) rhizome (d) bulb 2. Central canal is surrounded by an H-shaped area called __________ (a) Meninges (b) Vertebral column (c) Grey matter (d) Skull 3. Adolescent boys may have a hoarse voice because of enlargement of the ______. (a) Larynx (b) Pharynx (c) Thyroid gland (d)Pituitary gland 4. Deficiency of which hormone during early infancy causes cretinism ? (a) Thyroxine (b) Estrogen (c) Adrenaline (d) Insulin 5. Which type of neuron carries impulses from the brain or the spinal cord to the effectors? (a) cranial neuron (b) spinal neuron (c) motor neuron (d) sensory neuron 6. Blood circulation takes the following course in man’s heart (a) Left auricle → Left ventricle → Lungs → Right auricle → Right ventricle. (b) Right auricle → Right ventricle. (c) Left auricle → Left ventricle. (d) None of these. 7. An example of milch animal is (a) bullock (b) mule (c) pig (d) buffalo 8. Which of the following is not an example of a breed of buffalo? (a) Frieswal (b) Mehsana (c) Surti

(d) Murrah 9. ________ vaccine is used to build immunity against tuberculosis (a) BCG (b) DPT (c) MMR (d) TT 10. Which of these disease spreads through contact with infected rats? (a) Dengue (b) Sleeping sickness (c) Filariasis (d) Plague. IV. Write the differences between : 1. Cash crops and Food Crops 2. Congenital and Acquired disease. 3. Menopause and Mensturation. 4. Budding and Fragmentation. 5. Red blood cells and White blood cells. 6. Receptors and Effectors. V .Give reasons: 1. Blood transfusion is done very carefully by matching the blood group of the donor and recipient . 2. Seeds should be sown at a proper depth and proper distance 3. Adrenal gland is called gland of emergency. 4. Grains must be completely dried before storing. 5. Pituitary gland is called as master gland. VI .What would happen if : 1. We do not cover our nose during sneezing? 2. One accidently steps on a pointed nail? VII. Answer the following: 1. Adolescence is a crucial stage . Justify. 2. What kind of first aid can be given to second degree burns? 3. Pancreas is an endocrine as well as an exocrine gland. comment 4. Observe the diagram and answer the following

(i) Label the parts A – F

(ii) Part E has thick walls. Give reason.

(iii) Write the function of part ‘F’

(iv) How is mixing of oxygenated and deoxygenated blood prevented in heart ?

(v) What is cardiac cycle?

5. Given below is the diagram of female reproductive system:

a. Label the parts A—D. .

.b.Where does each of the following take place?

(I).Release of an egg.

(II).Fertilization

(III).Implantation

6. Why is it necessary to have iodized salt in the body?

7. A child has following symptoms

Alternate phases of chill and high fever in a day or 3 – 4 days, vomiting and severe head

ache, fever with profuse sweating and the red blood cell count drops.

(i) Identify the disease

(ii) Write the name of the pathogen and the vector that causes the above said disease.

(iii) Write any 2 preventive measures for the disease.

8. How does excessive consumption of alcohol affect human beings?

9. Why is SA node called as the pacemaker of the heart?

10. What are the benefits of Green Revolution in our country?

11. What are biofertilisers?.

12. Draw a neat diagram of adrenal gland and label the following parts:

VIII. Write the causative organisms for the following diseases:

1. Amoebic dysentery

2. Malaria

3. Cholera

4. Tuberculosis

5. Typhoid.

6. Plague.

7. Sleeping sickness.

8. Filariasis

9. Rabies

10.Influenza.

IX. Write the full form:

1. OPV

2. DPT

3 .MMR

4 .BCG

5 .AIDS

6. COVID-19

7. TT

லக்ஷ்மி பள்ளி, மதுரை – 625 020 பயிற்சிக்குரிய வினாக்கள் இைண்டாம் மமாழி – தமிழ்,

வகுப்பு: எட்டு

1. இக்காலத்தில் மக்களிடையய மனிதயேயம் குடைந்துவருவதால் ஏற்படும் இன்னல்கடள விளக்கி, மனிதயேயத்டத வளர்க்க சில வழிமுடைகடள எடுத்துக்கூைி ஒரு கட்டுடை எழுதுக. 2. ‘ோட்டுவளம் யவண்டின் காட்டுவளம் யவண்டும்‘ என்ை கருத்திடன ஆதரித்து ஒரு கட்டுடை வடைக. 3. ‘இயற்டகப் யபரிைர் யமலாண்டமயில் மாணாக்கரின் பங்களிப்பு‘ என்ை தடலப்பில் ஒரு கட்டுடை எழுதுக. 4. பள்ளியின் கடல, இலக்கிய ேிகழ்வுகளின் மாணவர் ஒருங்கிடணப்பாளைான ேீ, அடுத்தமாதம் உன் பள்ளியில் ேடைபபைவுள்ள மாவட்ை அளவிலான “இலக்கியத் பதன்ைல் - 2017” விழா பற்ைி எடுத்துக்கூைி, அதடன ஒளிப்பைம் எடுத்துத் பதாடலக்காட்சியில் ஒளிபைப்பக்யகாரி, பதாடலக்காட்சி ேிடலய இயக்குேருக்கு யவண்டுயகாள் விண்ணப்பம் எழுதுக. 5. அண்டமயில் ேீ படித்த சிைந்த கடத ஒன்டை விவரித்து, அது உன்டன ஈர்த்தவிதம் பற்ைி விளக்கி, அதடனப் படிக்குமாறு பரிந்துடைபசய்து உன் யதாழன் அல்லது யதாழிக்குக் கடிதம் எழுதுக.

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Lakshmi School, Madurai

Practice Worksheet

Class – VIII (Hindi)