UPKAR PRAKASHAN, AGRA-2

ByDr. Lal, Khanna & Jain

2018

© Publishers

Publishers

UPKAR PRAKASHAN2/11A, Swadeshi Bima Nagar, AGRA–282 002Phone : 4053333, 2530966, 2531101Fax : (0562) 4053330E-mail : care@upkar.in, Website : www.upkar.in

Branch Offices :4845, Ansari Road, Daryaganj,New Delhi—110 002Phone : 011–23251844/66

Paras Bhawan(First Floor),Khazanchi Road,Patna—800 004Phone : 0612–2673340

16-11-23/37, Moosarambagh, TeeganGuda, Opp. RTA Office Main Road,Beside–Andhra BankHyderabad—500 036 (T. S.)Phone : 040–66753330

H-3, Block-B, MunicipalPremises No. 15/2, Galiff Street,P. S. Shyampukur,Kolkata—700 003 (W.B.)Mob. : 07439359515

B-33, Blunt Square, Kanpur TaxiStand Lane, Mawaiya,Lucknow—226 004 (U.P.)Phone : 0522–4109080

8-310/1, A. K. House,Heeranagar, Haldwani,Distt.—Nainital—263 139 (Uttarakhand)Mob. : 7060421008

1461, Juni Shukrawari,Sakkardara Road,Opp. Hanuman Mandir,Nagpur—440 009Phone : 0712–6564222

63-64, Kailash Marg,Ground Floor,Shreeji Avenue, Malharganj,Indore—452 002 (M.P.)Phone : 9203908088

● The publishers have taken all possible precautions in publishing this book, yet if any mistakehas crept in, the publishers shall not be responsible for the same.

● This book or any part thereof may not be reproduced in any form by Photographic,Mechanical, or any other method, for any use, without written permission from the Publishers.

● Only the courts at Agra shall have the jurisdiction for any legal dispute.

ISBN : 978-81-7482-019-8

Code No. 450

Printed at : UPKAR PRAKASHAN (Printing Unit) Bye-pass, AGRA

Contents

● Previous Years’ Solved Papers

General StudySection I (History)

● Eighteenth Century India 4● Rise and Expansion of British Power 4● Administration, Economy & Society

(1757–1856) 6● Anti-imperialist struggles and the Revolt

of 1857 7● Administration Policy in Post 1857 Period 8● Economy & Economic Policy in Post

1857 Period 9● Social Reforms in 19th-20th Centuries 11● Education, Literature and Culture in

19th-20th Century 12● Rise of Nationalism and the Birth of

Indian National Congress 13● Militant and Revolutionary Nationalism 14● Mahatma Gandhi and Non-Cooperation

Movement 15● From Non-Cooperation to World War-II 16● From World War-II to Independence 18● Objective Questions 20● Very Short Questions 28● Short Questions 37

Section II (Geography)Part-I

● Lithosphere and Land Forms 3● Land Forms through Gradation 8

Part-II● Asia–Land, Climate and Vegetation 17● Asia–Natural Resources and its People 24

● Our Closest Countries 30● Countries of Plantation Agriculture :

Malaysia and Indonesia 40● Land of Maximum Concentration of

Human Beings 45● Land of the Rising Sun 49

Part-III● India 52

Section III (Civics)Part-I (Our National Goals and

Democracy)

1. Achieving our National Goals 32. Democracy and the Citizen 4

Part-II (Our Society)3. Education and Democracy 74. The Caste System 85. Untouchability 96. Other Social Problems 117. Welfare of Scheduled Castes and

Scheduled Tribes 13

Part-III (Economics)8. Economic Reconstruction 159. Agricultural Development 16

10. Industrial Development orImportance of Industrial Development 18

11. Population Growth and Development 19

Part-IV (National Integration)12. National Integration 21

Part-V (Defence of the Country)13. India's Defence 2314. Foreign Policy of India 2415. The United Nations Organisation 2616. India and Her Neighbours 27

Part-VI (World Problems)17. World Problems 30

( 4 )

General Science1. Carbon 3–6

2. Carbon Compounds 7–10

3. Light 11–15

4. Pressure 16–17

5. Magnetism 18–19

6. Electric Current 22–22

7. Rocks, Minerals and Metals 23–27

8. Metals and Their Properties 28–31

9. Man-made Materials 32–36

10. Microbial World 37–42

11. Agriculture–Practice and implements 43–4612. Economic importance of Plants

and Animals 47–50

13. Organic Evolution 51–54

14. Conservation of Natural Resources 55–56

15. Alternative Sources of Energy 57–58

16. How Leaves are Designated 59–60

17. Reproduction 61–63

Mathematics1. Square and Square Root 3–11

2. Cube and Cube Root 12–16

3. Index and Surd 17–20

4. Algebraic Expression 21–25

5. Division of Algebraic Expression 26–29

6. Equations of one unknown 30–35

7. Compound Interest 36–42

8. General Banking Facilities 43–439. Shares and Debentures 44–48

10. Parallel Lines 49–5311. Construction of Quadrilaterals 54–5612. Chords of Circle 57–59

13. Angles in a Circle 60–65

14. Tangent Lines of a Circle 66-69

15. Area of Rectilinear Figures 70–74

16. Circumference and Area of a Circle 75–7917. Volumes and Surface Areas of

Solid Figures 80–85

18. Statistics 86–88

English Language● Passage (1–35) 2–11

● Letter Writing 11–13

● English Grammar 13–24— Articles 13— Determiners 14— The Clause 14— The Tense 16— Homonyms 16— Active and Passive Voice 18— Subject Verb Concord 18— Vocabulary Bag 20— Cries of Birds and Beasts 21— Animals and their Young Ones 21— One Word Substitution 22— Transformation of Sentences 22

● Exercise (1–33) 24–40● Answers 40–52

Sainik SchoolEntrance Exam., 2016

(Class IX)Solved Paper

Paper–IMathematics and Science

Time : 2 : 30 hours] [Max. Marks : 275(Mathematics : 200 & Science : 75)

Part ‘A’ – Mathematics(200 Marks)

Section–I(Each question carries two marks)

Q. 1. Find the product of (a2) ×××× (2a22) ×××× (4a26).Ans. = a2 × 2 × a22 × 4a26

= 2 × 4 × a2 + 22 + 26

= 8a50

Q. 2. Using Euler’s formula find the number offaces of polyhedron having 6 vertices & 12 edges.

Ans. Euler’s formula⇒ F + V – E = 2

F + 6 – 12 = 2F = 2 + 12 – 6F = 8

So that will be octahedron.

Q. 3. Calculate the value of 100 ×××× 8 ++++ 10 ×××× 1 + 7.

Ans. = 100 × 8 + 10 × 1 + 7= 800 + 10 + 7 = 817

Q. 4. What is the point of intersection of x-axisand y-axis called ?

Ans. Point of intersection (x1 y1)

= ⎝⎜⎛

⎠⎟⎞b1c2 – b2c1

a1b2 – a2b1 ‚

c1a2 – c2a1a1b2 – a2b1

where a1x + b1y + c1 = 0

and a2x + b2y + c2 = 0

are two lines intersecting at any point (x1 y1).

Q. 5. Find the value of x if x – 8

5 =

x – 129

.

Ans. x – 8

5=

x – 129

= 9(x – 8) = 5(x – 12)

⇒ 9x – 72 = 5x – 60⇒ 9x – 5x = – 60 + 72⇒ 4x = 12

⇒ x =124

⇒ 3

The value of x = 3.

Q. 6. Eleven bags of wheat flour, each marked5 kg, actually contained the following weights of flour(in kg) 4·97, 5·05, 5·08, 5·03, 5·00, 5·06, 5·08, 4·98,5·04, 5·07, 5·00. What is the probability that any ofthese bags chosen at random contains more than 5 kgof flour ?

Ans. Total number of bags = 11, n = 11Probability of finding = 7 bags are more than 5 kg.

m = 7

p(ε) =mn

=more than 5 kg bagstotal number of bags

=711

Q. 7. If x = [ ]( )56280 ÷ ( )25

3 ×××× ( )1625 then find

the value of x.

Ans. x = [ ]( )56280

÷ ( )253

× 1625

= [ ]1 ÷ 8125 × 1625=

1258

× 1625

= 5 × 2 = 10Q. 8. Find cube root of 175616 by factorization

method.Ans.

2 175616

2 87808

2 43904

2 21952

2 10976

2 5488

2 2744

2 1372

2 686

7 343

7 49

7 7

1

Sainik School-IX (2016) | 3

= 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 7 × 7 × 7= 23 × 23 × 23 × 73

= 563

Q. 9. How many sides does a regular polygonhave, if the measure of an exterior angle is 12°°°° ?

Ans. No. of sides =36012

= 30

Q. 10. Evaluate :

[ ]( )13– 1

– ( )14– 1 – 1

Ans. = [ ]31 – 41– 1

= [– 1]– 1 = – 1

Q. 11. DA

F E

B C

x

52°

64°

AD || BC || EF and AE || DC.∠∠∠∠AFE = 52°°°°∠∠∠∠EAF = 64°°°°

∠∠∠∠X = ………Ans. ∠FEA = 180° – 64° – 52°

= 64°·.· ∠FEA = ∠BCD

= ∠EBC = 64°;∠ADC = ∠ABC

= 180° – 64° = 116°Then the value of ∠X = 116°Q. 12. If a spinning wheel has 3 green sectors, 1

Blue and 2 Red sectors. What is the probability ofgetting a green sector ?

Ans. Required probability

=36

= 12

Q. 13. In trapezium

E

A DGF

CB

25°

90° 90°

50° 60°30°

AE and DE bisect ∠∠∠∠ DAB and ∠∠∠∠CDA.

Find ∠∠∠∠ABC and ∠∠∠∠ DCB.

Ans. For ΔABF ∠BAF = 50°∠ABF = 180° – 50° – 90°

= 40°

For ΔCGD ∠GDC = 60°∠DCG = 180° – 90° – 60°

= 30°Then ∠ABC = 90° + ∠ABF

= 90° + 40° = 130°∠DCB = 90° + ∠DCG

= 90° + 30° = 120°Q. 14. Two equal sides of an isosceles ΔΔΔΔ are each

3 m less than 3 times of third side. Find length ofsides, if perimeter is 34 m.

Ans.

a b

c

a + b + c = 34 …(i)

if a = b a + 3 = 3c

a = 3c – 3

by (i) a + a + c = 34

2a + c = 34 …(ii)

6c – 6 + c = 34

7c = 40

c =407

2a + 407

= 34

2a = 34 – 407

=238 – 40

7

=1987

∴ a =997

Q. 15. The area of a circle is given as ππππx2 + 10 ππππx+ 25 ππππ. Find the radius as an algebraic expression.

Ans. Area = π[x2 + 10x + 25] [area = πr2]= π[x + 5]2

Then radius = x + 5

Q. 16. Three numbers are in ratio 1 : 2 : 3 andsum of their cubes is 4500. Find numbers.

Ans. Let numbers are x, 2x, 3x.x 3 + (2x )3 + (3x)3 = 4500

x 3 + 8x3 + 27x3 = 4500

36x 3 = 4500

x 3 =450036

= 125 ;

x = 5

Then numbers are = 5, 10, 15.

4 | Sainik School-IX (2016)

Q. 17. Find

A

x

125°

125°

X = ……Ans. Sum of external angles = 360°x + 125° + 125° = 360°

x + 250° = 360°x = 360° – 250°x = 110°

Q. 18. A coin is tossed 2 times. What are the totalnumber of possible outcomes ?

Ans. A coin has two sides = Head, Tail.If the coin toss 2 times get 4 outcomes.

P(E) = {HH, HT, TH, TT}Q. 19. What is the range of data 30, 61, 55, 25, 2,

12, 17, 81 ?Ans. = 81 – 2

= 79

Q. 20. Find the value of x– 2 if

X = (100)1 – 4 ÷ (100)0

Ans. X = [100]– 3 ÷ 1= (100)– 3

X– 2 = [(100)– 3]– 2

= 1006

Section–II(Each question carries three marks)

Q. 21. A DVD player and TV were bought forRRRR 8,000 each. The shopkeeper made a loss of 4% onthe DVD player and a profit of 8% on the TV. Findthe gain or loss per cent on the whole transaction.

Ans. Loss =8000 × 4

100 = 320

Gain =8000 × 8

100 = 640

= 640 – 320 = 320

He will gain = 320.

Gain % =320

16000 × 100

= 2%

Q. 22. Arif took a loan of RRRR 80,000 from a bank.If the rate of interest is 10% per annum, find the

difference in amounts he would be paying after 112

years, if the interest is :(a) compounded annually

(b) compounded half yearly

Ans. (a) Sum of amount after 112 year

= 80000 × 110100

× 105100

= 8 × 110 × 105= 92400

(b) Sum of amount after 12 year

= 80000 × 105100

× 105100

× 105100

=8 × 105 × 105 × 105

100

=9261000

100

= 92610

Difference = 92610 – 92400

= RRRR 210

Q. 23. Find the value of—

(i) ( )12– 2

+ ( )13– 2

+ ( )14– 2

(ii) (30 + 4– 1) ×××× 22

Ans. (i) ( )12– 2

+ ( )13– 2

+ ( )14– 2

= 22 + 32 + 42

= 4 + 9 + 16

= 29

(ii) (30 + 4– 1) × 22

= ( )1 + 14 × 4=

54 × 4 = 5

Q. 24. What least number must be subtractedfrom 7250 to get a perfect square ? Also, find thesquare root of this perfect square.

Ans. (85)2 = 7225

if 7250 – 7225 = 25

or 7250 – 25 = 7225

8—72

—25 85

+ 8 64

165 825

5 825

00

So, 852 = 7225 perfect square

Sainik School-IX (2016) | 5

Q. 25. If ( )y 2 + 1y 2 = 83. Find y 3 – 1y 3Ans. y2 +

1y2

= 83

( )y – 1y2

= 83

( )y – 1y2

+ 2 = 81

y – 1y

= 9

y3 – 1y3

= ( )y – 1y3

+ 3y × 1y ( )y – 1y

= (9)3 + (3 × 9)= 729 + 27

= 756

Q. 26. A motor boat covers a certain distancedownstream in a river in 5 hours. It covers the samedistance upstream in 6 hours. The speed of water is 2km/hr. Find the speed of the boat in still water.

Ans. Upstream speed = D6

Downstream speed = D5

D6

+ 2 =D5

– 2

D5

– D6

= 4

⇒6D – 5D

30= 4

⇒D30

= 4

D = 120

Speed of boat =D6

+ 2

=1206

+ 2

= 20 + 2

= 22 km/hr

Q. 27. A dealer buys an article for RRRR 380. At whatprice must he mark it so that after allowing adiscount of 5%, he still makes a profit of 25% ?

Ans. The selling price of the article

=380 × 125

100 = RRRR 475

This amount of 95% of the marked price.

Hence, the marked price

=475 × 100

95 = RRRR 500

Q. 28. The population of village is 20000. If thebirth rate is 5% p.a. and death rate is 3% p.a. Findthe population after 2 years.

Ans. = 20000 × ( )1 + 5 – 31002

= 20000 × 102100

× 102100

= 20808

Q. 29. The distance between two stations is 550km. Two trains start at the same time from the twostations on parallel tracks to cross one another. Thespeed of one train is 10 km/hr more than the other. Ifafter 3 hours, the trains are 40 km apart, find theirrespective speeds.

Ans. Let speed Ist train = x + 10IInd train = x

Sum of distance travelled by both train in 3 hours

= 550 – 40 = 510

So, Train’s speed = (x + 10) + x

=5103

= 170

2x + 10 = 170

2x = 160

x = 80

Speed of Ist train = x + 10 = 90 km/hr

IInd = x + 80 km/hr

Q. 30. Simplify :

(5)3 ×××× (10)– 5 ×××× 3– 5

5– 7 ×××× 6– 5

Ans. (5)3 × (10)– 5 × 3– 5

5– 7 × 6– 5

=53 × 57 × 65

105 × 35

=53 × 57 × 35 × 25

25 × 55 × 35

= 53 × 52 = 55

= 3125

Q. 31. Show that :

( )43x – 34y2 + 2xy =

169

x 2 + 916

y 2

Ans. ( )43x – 34y2

+ 2xy

=169

x2 + 916

y 2

L.H.S. =169

x2 + 916

y2 – 2 × 43 ×

34xy + 2xy

=169

x2 + 916

y 2 – 2xy + 2xy

=169

x 2 + 916

y 2

Then L.H.S. = R.H.S.

6 | Sainik School-IX (2016)

Q. 32. The ratio between interior and exteriorangle of a regular polygon is 8 : 1. Find the numberof sides of the polygon.

Ans. Let Exterior angle = xInterior angle = 8x

Then x + 8x = 180°9x = 180°x = 20°

No. of sides =36020

= 18

Q. 33. Find the area of trapezium.

3 cm

9 cm

7 cm

Ans. Area of trapezium

=12 × h × (a + b)

=12 × 3 × (7 + 9)

=12 × 3 × 16

= 3 × 8

= 24 cm2

Q. 34. Find the height of cuboid whose base areais 360 cm2 and volume is 1800 cm3.

Ans.

Volume of cuboid = Area of base × height

1800 cm2 = 360 cm2 × height

∴1800360

= height

Height = 5 cm

Q. 35. Represent – 3/7, – 1/7 and 2/7 on a numberline.

Ans.

−3 −2

37

−1 0 1 2 3

−

17

27

−

Q. 36. Find the length of longest pole that can bekept in a room of 12 m ×××× 4 m ×××× 3 m.

Ans. Length of longest pole

= √⎯⎯⎯⎯⎯⎯⎯⎯⎯122 + 42 + 32

= √⎯⎯⎯⎯⎯⎯⎯⎯⎯144 + 16 + 9

= √⎯⎯⎯169 = 13 m

Q. 37. The diameter of base of a cylinder is 140cm and volume is 1·54 m3. Find its height.

Ans. r =1402

cm

r = 70 cmVolume of cylinder in cm

= 1·54 × 100 × 100 × 100= 154 × 100 × 100 cm

Volume of cylinder = πr2h

154 × 100 × 100 =227

× 70 × 70 × h

h = 100 cmh = 1 m

Q. 38. Express 212 as sum of two consecutiveintegers.

Ans. The value of 212 = 441The two consecutive integers are 220 and 221.Q. 39. If 21y5 is a multiple of 9, where y is a digit,

what is the value of y ?Ans. The value of y = 1 because if the sum of all the

digits is divided by 9 the number can be divided by 9.

Q. 40. Divide :7(x3y2z2 + x2y3z2 + x2y2z3) by 4(x2y2z2)Ans. 7(x3y2z2 + x2y3z2 + x2y2z3) by 4(x2y2z2)

=7(x2y2z2) (x + y + z)

4(x2y2z2)

=74 [x + y + z]

Section–III(Each question carries Ten marks)

Q. 41. The hour hand of a circular clock is 10 cmlong. How much distance will it cover in 2 days or 48hours ?

Ans. The hour hand of a circular clock will coverthe distance 4 times of its circumference

= ( )2 × 227 × 10 × 4=

17607

Q. 42. A collage is made up of 400 rhombusshaped pieces and 200 trapezium shaped pieces. Thediagonals of the rhombus are 6 cm and 4 cm long.The lengths of the parallel sides of the trapezium are4 cm and 8 cm and the height is 10 cm. Find the areaof the college and also the cost of painting it at therate of RRRR 250 per m2.

Ans. Area of Rhombus =12 × 6 × 4 = 12 m2

Area of Trapezium =12 × [4 + 8] × 10

= 12 × 5 = 60 cm2

Sainik School-IX (2016) | 7

Area of College = 12 × 400 + 60 × 200

= 4800 + 12000

= 16800 cm2

=16800

100 × 100 m2

= 1·68 m2

Cost of painting = 1·68 × 250

= RRRR 420

Q. 43. The rainwater falling on a roof 40 m ×××× 25 mis collected in a cylindrical tank with diameter 7 mand height 10 m. If the tank is completely filled, findthe height of the rainwater on the roof.

Ans. Volume of Tank = πr2h

=227

× [ ]72 2

× 10

= 11 × 7 × 5

= 385 m

Height of Rainwater =3851000

= 0·385 m

Q. 44. MNOPQ is a regular pentagon. Thebisector of angle M meets side OP at K. Findmeasure of ∠∠∠∠MKO.

Ans. Each angle of Regular Pentagon

= (5 – 2) × 180°

5

= 3 × 180°

5

=540°

5

=5405

= 108°

M

N

O

K

PQ

54°

54°

108°

108°

108°108°

∠MKO = 360° – [54° + 108° + 108°]

= 360° – 270°

= 90°Q. 45. How many wooden blocks of size 22 cm ××××

10 cm ×××× 7 cm are required to make a woodenpartition of 11 m ×××× 3·5 m ×××× 40 cm, if the glue andfilling material used occupies one tenth of the woodenpartition.

Ans. Volume of wooden blocks= 22 × 10 × 7= 1540 cm3

Volume of wooden partition

= 1100 × 350 × 40

= 15400000 cm3

After a partition angle size of block

= 15400000 × 110

= 1540000

= 15400000 – 1540000

= 13860000 cm3

No. of wooden partition

=13860000

1540

= 9000

Q. 46. The sides of a swimming pool are 7 m, 6 mand 15 m. If 8400 litres of water is pumped out, whatis the decrease in water level ?

Ans. Volume of Swimming Pool

= 7 × 6 × 15

= 630 m3

Pumped out water =84001000

= 8·4 m3

Decrease in water level

=8·4

7 × 6 = 0·2 m

Q. 47. Ajit bought 150 kg sugar at RRRR 50 per kg.He sold 70% of sugar at RRRR 70 per kg and balance atRRRR 40 per kg. Find overall profit/loss on the wholedeal ?

Ans. Total price of sugar

= 150 kg × 50

= RRRR 7500

If 70% sugar sold = RRRR 70 per kg

= 150 × 70100

× 70

= RRRR 7350

and remaining sugar 45 kg sold on RRRR 40

= 1800

So, total price of sold sugar

= 7350 + 1800 = RRRR 9150

and Profit & loss =9150 – 7500

7500 × 100

=16507500

× 100

= 22% profit

8 | Sainik School-IX (2016)

Q. 48. The following table gives the marks scoredby 100 students in an Entrance Examination.

Marks No. of Students

0–10 410–20 1020–30 1630–40 2240–50 2050–60 1860–70 870–80 2

Represent this data in the form of a histogram.Ans.

Marks

No.

of

Stud

ents

010 20 30 40 50 60 70 80 90

22

8

446

810

10121416

1618

1820

2022

2224

Q. 49. Find the number of coins, 1·5 cm indiameter and 0·2 cm thick, to be melted to form aright circular cylinder of height 10 cm and diameter4·5 cm.

Ans. Volume of cylinder

= π × 4·52

× 4·52

× 10

=227

× 94 ×

94 × 10

=11 × 81 × 5

7 × 4

Volume of coin = π × 1·52

× 1·52

× 0·210

=227

× 34 ×

34 ×

210

=11 × 9

7 × 4 × 10

No. of coins =

11 × 81 × 57 × 4

11 × 97 × 4 × 10

=11 × 81 × 5

7 × 4 ×

7 × 4 × 1011 × 9

= 450

Q. 50. In the adjoining figure, the bisectors of∠∠∠∠A & ∠∠∠∠ B meet at a point P. If ∠∠∠∠C = 96°°°° and ∠∠∠∠ D =30°°°° find ∠∠∠∠APB.

Ans.

xx y

y

96°30°P

CD

A B

30 + 96 + 2x + 2y = 3602[x + y] = 360 – 126

x + y =2342

= 117°

Then ∠APB = 180° – [x + y]= 180° – 117°= 63°

Part ‘B’ – Science(75 Marks)

(Q. 1 to 15) carry 1 mark each.Q. 1. The synthetic fibre that appears to resemble

wool is—(A) PET (B) acrylon(C) rayon (D) nylonAns. (B)Q. 2. A prominent constellation looking like a

distorted form of the letter W or M, is the—(A) Cassiopeia (B) Big dipper(C) Orion (D) Ursa

Ans. (A)Q. 3. An example of a plastic which cannot be

remoulded again by simple heating is—(A) polyethene (B) PVC(C) polystyrene (D) bakeliteAns. (D)

Q. 4. Cellulose is made up of a large number of……… units.

(A) amide (B) amino(C) glucose (D) sucroseAns. (C)

Q. 5. Relationship between a biotic communityand an abiotic environment is called—

(A) Biodiversity (B) Ecosystem(C) Symbiosis (D) SurvivalAns. (C)

Q. 6. Lactobacillus bacteria help to make—(A) bread (B) pastries(C) cake (D) curdAns. (D)

Q. 7. World Water day is observed on—(A) 24 March (B) 23 March(C) 21 March (D) 22 MarchAns. (D)

Sainik School-IX (2016) | 9

Q. 8. The place meant for conservation ofbiodiversity in their natural habitat are—

1. Zoological gardens2. Botanical gardens3. Wildlife sanctuary4. National park(A) 1 and 2 (B) 2 and 3(C) 3 and 4 (D) 1 and 4

Ans. (C)

Q. 9. Which of the following is considered a cleanfuel ?

(A) Cowdung cake (B) Petrol

(C) Kerosene (D) Hydrogen

Ans. (D)

Q. 10. Which one of the following metals does notreact with dilute HCL ?

(A) Magnesium (B) Aluminium

(C) Iron (D) Copper

Ans. (D)

Q. 11. Solution of which of the following oxidesin water will change the colour of Blue litmus toRed ?

(A) Sulphur dioxide (B) Magnesium oxide

(C) Iron oxide (D) Copper oxide

Ans. (A)

Q. 12. The material used for making kitchencontainer is—

(A) PVC (B) Acrylic

(C) Teflon (D) PET

Ans. (C)

Q. 13. Which of the following will not conductelectricity ?

(A) Lemon juice (B) Vinegar

(C) Tap water (D) Vegetable oil

Ans. (D)

Hint—Vegetable oil is not solvent. This means thereare not many ions in vegetable, so there is no easy pathfor electricity to flow.

Q. 14. Which of the following is not a part ofsolar system ?

(A) Asteroid (B) Satellite

(C) Constellation (D) Comet

Ans. (C)

Q. 15. The phenomenon of ‘Marble Cancer’ isdue to—

(A) Soot particles (B) CFCs

(C) Log (D) Acid rain

Ans. (D)

Q. 16 to 25 carry 2 marks each.

Q. 16. Why a crackling sound is heard whiletaking off a sweater during winters ?

Ans. A cracking sound is heard while taking offsweater made of synthetic fibre during wintersespecially when the weather is dry because, since thereis some humidity also present in the atmosphere andsynthetic fibre gets charged and due to attraction forcesacting between charged particle they oppose theirdetachment and create a cracking sound.

Q. 17. Differentiate between “Spontaneous andExplosive combustion”.

Ans. A combustion which occurs on its ownwithout the application of heat is called spontaneouscombustion. For example forest fire, burning of whitephosphorus.

The process of combustion where large amount ofgases are evolved with the production of a tremendousamount of heat, light and sound is called explosivecombustion for example Burning of cracker.

Q. 18. Calorific value of wood is 18000kJ/kg Howmuch wood is required to produce heat energy of144,000kJ ?

Ans. To produce heat energy of 144,000 kg

= 14400018000

= 8 kg wood

Q. 19. A force of 150N is applied to an object ofarea 5m2. Calculate the pressure.

Ans. Pressure =ForceArea

=1505 m2

= 30 N/m2

= 30 Pa

Q. 20. How reproduction of Hydra differs fromthat of Amoeba ?

Ans. In the hydra budding process occurs while inamoeba binary fission occurs in which parent cell isdivided into two individuals but in hydra an off spring isseparated from the parent.

Q. 21. Explain why sliding friction is less thanstatic friction ?

Ans. Sliding Friction is always less than staticfriction because two sliding objects find less time to getinterlocked against each other’s irregularities of surfacesas a result of which they experience less friction.

Q. 22. How do vaccines work ?

Ans. Vaccines work by stimulating our immunesystem to produce antibodies (substance produced by thebody to fight disease) without actually infecting us withthe disease. They Trigger the immune system to produceits own antibodies, as though the body has been infectedwith a disease. This is called active immunity.

10 | Sainik School-IX (2016)

Q. 23. Hens and frogs are both oviparousexhibiting different types of fertilization. Explain.

Ans. Both the animals produce eggs but the maindifference lies, where their fertilisation occurs, thefertilisation of eggs is in the water i.e., outside theirbody whereas the fertilisation of hen’s egg occurs insidethe body that is hens egg has a hard shell whereas theegg of a frog is like a soft jelly.

Q. 24. What is meant by Water table ?Ans. Upper surface of ground water below which

soil is saturated with water that fit its all voids andinterstices and where the pressure or water in the soilequals the atmospheric pressure.

Q. 25. Distinguish between ‘Speedometer’ and‘Odometer’.

Ans. Speedometer measures the speed at which youare travelling (how fast), odometer measures thedistance that you have travelled (how far).

Question 26 to 35 carry 3 marks each.Q. 26. What is freezing mixture ? How common

salt helps to clear pavements covered with snow ?

Ans. A mixture of two or more substances (e.g. icewater and salt or dry ice and alcohol) which can be usedto produce temperatures below the freezing point ofwater.

Clearing winter roads to the bare pavement usuallyrequires de-icing chemicals. In Wisconsin the mostcommon chemical is salt (sodium chloride) whichusually comes from mined rock salt that has beencrushed, screened, and treated with an anti-caking agentDe-icing salt is relatively light-just over one ton percubic yard and comes as a mixture of three eighths inchgranules to fine crystals.

Q. 27. Mention the effect of iodine in water onthe growth of tadpoles.

Ans. The feeding of dried thyroid gland to tadpolescauses an early differtiation in proportion to the quantityfed or the percentage of iodine content of the gland useswith the larger doses and the higher iodine percentage,metabolism is stimulated to such an extent that theanimal emaciate rapidly and die early, before there istime for much differentiation. With smaller amounts andlower iodine percentages the size of the animals isroughly inversely proportional to the amount orpercentage.

Q. 28. Write short note on Adam’s apple.Ans. St Puberty, the voice box or the earynx begins

to grow. Boys develop larger voice boxes. The growingvoice box in boys can be seen as a protruding part of thethroat colled sdoni’s apple.

Q. 29. Eyes of nocturnal birds have large corneaand large pupil. How does it help them ?

Ans. Eyes of nocturnal animals like owl has largecornea and a large pupil, these features increase theirfield of vision and an increase retinal surface and helpthem to collect more ambient light during night.

Q. 30. Explain how will you make a tester fortesting electric current using a magnetic compass andempty matchbox, a battery of two cells andconnecting wire ?

Ans.

Q. 31. Make sketch of human nerve cell. Whatfunctions nerve cell performs ?

Ans. A neuron or nerve cell is elongated in shape.Nerve cells are branched to receive and transfermessages. Nerve cells help control and co-ordinate theworking of different parts of the body. The brain is madeup of approximately 100 billion neurons.

Neurons have specialized projections calleddendrites and axons Dendrites bring information to thecell body and axons take information away from the cellbody. Some nerve cells are short in length (less than amillimeter) and some are long up to 1·5 meters.

Dendrite

Nucleus

Axon

Nerve Cell

Q. 32.

A B

A block is kept in two different ways on a tableas shown in figure. Explain in which position thepressure exerted by the block on the table will bemaximum.

Ans. In A and B block the volume of both the blockis same but the base area of A block is less than B block.Hence the pressure exerted by the block A will bemaximum.

continue

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