ug–1 & 2, concorde complex, above obc bank. r.c....

UG–1 & 2, Concorde Complex, Above OBC Bank. R.C. Dutt Road., Alkapuri Baroda. Ph. 6625979, 6534152K H O J – 2 0 1 7 D a t e : 8 - 1 0 - 2 0 1 7

C LA S S - 8 - A NS W E R K EY

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Mental Ability Mathematics Physics/Chemistry BiologyQ. No. Ans. Q. No. Ans. Q. No. Ans. Q. No. Ans.1 D 1 D 1 C 1 C2 C 2 D 2 B 2 B3 B 3 C 3 B 3 B4 D 4 B 4 D 4 D5 C 5 D 5 B 5 A6 D 6 D 6 A 6 B7 D 7 A 7 A 7 D8 B 8 C 8 B 8 C9 A 9 C 9 C 9 B10 B 10 C 10 B 10 A11 C 11 B 11 D 11 C12 B 12 A 12 C 12 B13 C 13 C 13 A 13 A14 A 14 D 14 D 14 B15 C 15 A 15 C 15 C16 D 16 C 16 A 16 C17 A 17 A 17 D18 A 18 B 18 B19 D 19 A 19 D20 D 20 C 20 A21 C 21 D22 A 22 B23 C 23 A24 C 24 D25 D 25 C26 C 26 A27 B 27 B28 C 28 D29 C 29 D30 D 30 A31 A32 B33 C34 A

Page # 1UG–1 & 2, Concorde Complex, Above OBC Bank. R.C. Dutt Road., Alkapuri Baroda. Ph. 6625979, 6534152

MENTAL ABILITY1.Sol. (d) As given 1 is coded as M, 8 as D, 4 as B, 6 as J, 3 as I and 2 as L. So, 184632 is coded as

MDBJIL.2.Sol. (c) As given 8 is coded as D, 7 as W, 9 as N, 3 as I, 4 as B and 1 as M. So, 879341 is coded

as DWNIBM.3.Sol. (b) The numbers are coded as shown :

3 9 4 6 1 8 7P O A L R S Ei.e., 9 as O, 4 as A, 6 as L, 7 as E and 8 as S. So, 94678 is coded as OALES.

4.Sol. (d) Batsmanm is a subset of Cricket and, Stick is something unrelated to Cricket, therefore,

our answer is (d).5.Sol. (c) Book, Pen, Pencil are neither subset of one another nor have anything in common,

Therefore, our answer is (c).6.Sol. (d) The following diagrams clarifies my movements.

W SE

N

O

7.Sol. (d) As shown in figure the man initially faces in the direction OA. On moving 90º clockwise,

he faces in the direction OB. On further moving 180º anticlockwise, he faces in the directionOC. Finally on moving 90º anti-clockwise, he faces in the direction OD, which is South-East.

8.Sol. (b) From the information given in the question, it is clear that, the only daughter of the

woman's father is the woman herself, and hence the man in the photograph is her son.Therefore, the woman is the mother of the man in the photograph. The answer is (B).

9.Sol. (a) Option (A) represents that A is the grandfather of T

(i) B – T = B is the sister of T.(ii) S × B = S is the father of B, here S will be father of T [from information (i)](iii) A × S = A is the father of S, hence A will be grandfather of B.


10.Sol. (b) A leap year has 366 days

Now if we divide 366 by 7 it gives 2 as remainder.hence number of odd days in 366 days is 2.

11.Sol. (c)

12.Sol. (b)

13.Sol. (c)

14.Sol.(a)


15.Sol. (c)

16.Sol.(d)

17.Sol. (a) On interchanging and × we get the equation as

5 + 6 × 3 - 12 25 + 18 - 6 = 17

18.Sol. (a) On interchanging × and + we get the equation as

2 + 3 × 6 - 12 42 + 18 - 317

19.Sol. (d) Let Sunita’s present age be x years.

Then, Reena’s present age = 2x years.Three years ago, Sunita’s age = (x – 3) and Reena’s age = (2x – 3).So, (2x – 3) = 3(x – 3) or 2x – 3 = 3x – 9 or x = 6.

Reena’s present age = 2x = 12 years.20.Sol. (d) Any year divisible by 5 is leap year by 4 is called leap year.

MATHEMATICS1.Sol. (d)

ax + b = 0

bxa


2.

Sol. (d) x ky

6 = k18

1k3

1x 153

3.

Sol (c)2

2 2aa 62

23a 364

a/2 a/2

aa6cm

a2 = 48

a 48

a 4 3

side = 4 3

4.Sol. (b) Two digit numbers = 10x + y

5.Sol. (d) (n – 2) × 180.

(6 – 2) × 180 4 × 180º = 720º

6.Sol. (d) 1 + z7.Sol. (a)8.Sol. (c) cows Bags days

40(x1) 40(y1) 40(z1)1(x2) 1(y2) K(z2)

x1y2z1 = x2y1z2

40 × 40 × 1 = 40 × k × 1c = 40 k = 40


9.Sol. (c) Sunil’s height = 4x

Sanjay’s height = 5x

4x = 152 x = 38So, 5x = 5 × 38 = 190 cmSanjay’s height = 5 × 38 = 190 cm.

10.Sol. (c) Masked Price = Rs. s

discount (%) = a% Discount = x + a%

xa100

11.

Sol. (b)

E14cm

C

BA

D

h

6cm

Area of trapezium = 60 cm2

1 a b h 602

1 6 14 h 602

20 × h = 120 (h = 6 cm)By pythagorous theorem in BEC h2 + 82 = BC2

62 + 82 = BC2

100 = bc2 (BC = 10 cm)

12.

Sol. (a) Let the masked price be Ex.

x × 90% = selling priceand C.P. = 2360So, Acc to Ques.x × 90% = C.P. ×(100 + 25)%

90 125x 360100 100

x = E500


13.

Sol. (c)

14.

Sol. (d)5 100 125%4

15.

Sol. (a)

10 cm

CD

A B

xx

x8 cm

8 cm O

In AOB

2 2 210 x 8

x 36 6

other diagonal = 12 cm

Area of rhomless = 21 12 16 96 cm2

16.

Sol. (c)5 25 1600 20

100 100

17.

Sol. (a) Let no be 10x + b

so, acc. to questions

x = 3 + b

10 (3 + b) + b

= 30 + 10b + b = 11b + 30

18.

Sol. (b)40 20100 300

100 100

40 40 16100

19.

Sol. (a) 180º

20.

Sol. (c)1x yx

i.e. kyx


ky2x

y is halved

21.

Sol. (c) Area = 23 a4

22.Sol. (a) MP = Rs. 1200

Discount = 12%

S.P. = 1200 88 1056

100

23.Sol. (c) (n – 2) × 180 = (9 – 2) × 180

7 × 180 = 1260º24.

Sol.(c) 0.01 1000.1

0.01 100 10

1 100

10%25.

Sol. (d) Let x x

x

Area 23 x4

Now acc. to Ques.

2x 2x

2x

Area = 2 23 32x 4x4 4

23 x

Area becomes 4 times26.Sol. (c) 11x = 22y

x = 2


27.Sol. (b) 25% × 25%

25 25 1100 100 16

= 0.062528.

Sol. (c)h

x

1 x h2

x

x, 2x

21 x h x2

h 2x

29.Sol. (c) S.P. = 13500

Let original Price be x

x813500 x100

108x13500100

x = 12500

30.

Sol.(d)

A B

CD

55º 55º

CD || AB

A D 180º

55º D 180º

D 125º

PHYSICS1.Sol. (c) Object L is made of steel and it is attracted by both North and sourth poles at all ends.2.Sol. (b)

Cyclone is formed due to low pressure in sea


– In summer wind down from land towards the ocen.– Coastline is more Vulnerable to cyclones

3.Sol. (b) Horse gets a reaction force from ground while it pushes the ground groundbractward4.Sol. (d) Volume of water decreases up to 4ºC and after 4ºC it increases5.Sol. (b) slope is maximum from c to d.

acceleration = slope of steet time graph

y 60 20 40a slopet 1 0.75 0.25

2kma 160h

6.Sol. (a) Due to parallel connection voltage remain same but effective restance decreases.

– Brightness depends upon power 2VP

R of R decreased power increases.

– So brightness increases with inerease in power

7.Sol. (a) Gravity and friction are more common compared to electrostate and magnetidc force.8.Sol. (b) Sound cannot travel in vaccume. So in space no sound must be heard desring explosion.9.Sol. (c) The small patches are from circular images of sun.10.Sol. (b)

large area reducal pressure

force (or) weightPAra

1PA

11.Sol. (d) Mat increases function and keep rohan from slipping and falling in his bathrom

12.Sol. (c) Weight W = mg (N)

– It is a force acting due to gravity– It changes with location as gravity of larth at 9.8 but on moon it is less, similarity,

its different every where– Its unit are newtons (N)


13.Sol. (a) As sun rases over heat from moring it non length of shadow decreases and as sun goes down

from noon to evening length of shadow increases.14.Sol. (d) Current hows due to Btential difference.

– As potential difference between claws of birds is very small so it does not feet shock.15.

Sol. (c) Given A = 4 × 10–4 m2 density of water = 1000 kgms

h = 0.03 mg = 10 N/kg (or) m/s2

Weight = m ×gmall = density × volume

= 1000 × (A × h) = 1000 × (4 × 10–4 × 0.3)W = 1000 × (4 × 10–4 × 0.3) × 10W = 1.2 N

16.

Sol. (a)F 180P 60 PaA 3

17.

Sol. (d) refrachve intex speed of light in vacuumSpeed of light in medium

CHEMISTRY18.

Sol. (b) Resources which are unlimited and are not likely to be exhausted by human activities

- Inexhaustible Resources.

19.

Sol.(d) The amount of resources in nature is limited. They can be exhausted by human activities

- Exhaustible Resources

20.

Sol.(a) Definition of fossils

21.

Sol.(d) Fact


22.

Sol.(b) The process of separating the various constituents/fractions of petroleum is known as refining.

Petroleum gas extraction is not called refining per se but pertoleum is a product of refiningprocess.

23.

Sol. (a) Petroleum is called ‘Black Gold’

24.

Sol. (d) Factual

25.

Sol. (c) Definition

26.

Sol. (a) Petroleum was formed from organisms living in the Sea. As these organisms died, their bodiessettled at the bottom of the sea and got covered with layers of sand and clay. Over milions ofyears absence of air, high temp and pressure transformed the dead organisms into petroleum& natural gas.

27.

Sol. (b) Copper, iron and aluminium are metals (electron doners)

28.

Sol. (d) Metals are ductile and malleable, non-metals are not Zinc granule.

29.

Sol. (d) Coal is a non-metal

30.

Sol. (a) Fact ( Because its ignition temp is very low 350C )

31.

Sol. (a) Acids change blue litmus to red non-metal acides are acidic in nature sulphur dioxide is a non-metal oxide.

32.

Sol. (b) Colour has nothing to do with to be used as a electric wires.

33.

Sol. (c) Fact


34.

Sol. (a) Polymers are long chain of Carbon atoms plastic and rubber are polymers.

BIOLOGY1.

Sol. (c) Testosterone hormone is secreted by males.

2.

Sol. (b) Sperms are produced in testis.

3.

Sol. (b) Progesterone hormone is responsible for secondary sexual character in females.

4.

Sol. (d) Amoeba and Paramecium belongs to group protozoan

5.

Sol. (a) The gas released during fermentation of sugar by yeast cells is Carbon dioxide.

6.

Sol. (b) Flowers, Fruits & Seeds constitute the reproductive part of the plant body.

7.

Sol. (d) Photosynthesis is the process by which plants use the energy from sunlight, with the help ofchlorophyll to produce glucose. Thus all the given factors are required for the photosynthesis.

8.

Sol. (c) Digestion of food in human starts from Mouth.

9.

Sol. (b) Phloem transports Food prepared by leaves in the form of sucrose.

10

Sol. (a) Cow dung is organic biodegradable product, rest are all inorganic factory made products.

11.

Sol. (c) Urea is an example of fertilizer.

12.

Sol.(b) As a family of bobcats moved into an area with a large rabbit population, they will start consumingthe rabbits, thus the rabbit population may decrease.

13.

Sol. (a) Watering and manuring are necessary for the growth of crops.


14.

Sol. (b) Amoeba procures food through pseudopodia

15.

Sol. (c) Acids.

16.

Sol. (c) Transpiration is the loss of water vapour through stomata and lenticels.

ug–1 & 2, concorde complex, above obc bank. r.c....

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