tnpsc combined engineering services 20-05-2018 mental...

TNPSC Combined Engineering Services 20-05-2018

Mental Ability & Aptitude

1.

2.

3.

Ans: C

Two-dimensional Diagrams:

In one-dimensional diagrams, only length is taken into account. But in two- dimensional diagrams the area represent the data and so the length and breadth have both to be taken into account. Such diagrams are also called area diagrams or surface diagrams. The important types of area diagrams are:

1. Rectangles 2. Squares 3. Pie-diagrams ,Ughpkhd tpsf;fg; glq;fs;

xU ghpkhzg; glq;fspy; ePsk; kl;Lk; fzf;fpy; vLj;Jf; nfhs;sg;gl;lJ. Mdhy; ,U ghpkhd tpsf;fg;glq;fspy; tptuq;fspd; gug;G Fwpg;gplg; gLtjhy; ePsk;> mfyk; ,uz;LNk vLj;Jf;nfhs;sg;gLfpwJ. ,k;khjphpahd glq;fs; gug;gsT tpsf;fg;glq;fs; vdTk; miof;fg;gLfpd;wd. ,itahtd. 1. nrt;tfq;fs; 2. rJuq;fs; 3. tl;l tpsf;fg; glq;fs;

4.

Solution:

30.756 100 56.7%

4

5.

Explanation: Ans: A. 5

3 2 1 7 3'sOpposite Number 7

2 2 1 5 2'sOpposite Number 5

5 2 1 11 5'sOpposite Number11

7 2 1 15 7'sOpposite Number15

6.

Explanation:

Largest 4-digit number = 9999

Required number = (9999 - 55) = 9944.

7.

8.

Explanation:

1 2 1 1100 100 5 years=5years 4 Months

18.75 3

xN

R

9.

Or 30000(107/100)=32100 (32100*7)/100=147 is for 1 year 2100+2100+147=4347

10.

Explanation:

3 3 93 3 4.5

2 2 2h a cm

11.

Explanation:

Let their ages be 2x and 3x years (2x + 12) / (3x + 12) = 11 /15 ⇒ 15(2x + 12) = 11(3x + 12) ⇒ 3x = 48 ∴ x = 16 ∴ age of sumit = 3x = 48 years

12.

5 8

P+S.I=A 10,080100

140P 510,080 P=10,080 Rs.7200

100 7

PP

13.

Explanation: Ans: D. 2 hours

1 1 1 2 3 1 6 1

x,y,z 1hour work=6 4 12 12 12 2

x, y , z work together to complete it in 2 days.

14.

Ans: B

15.

Explanation:

2 2

2

c d c d c d

c cd c c d

HCF c d

16.

Explanation: Ans: C. 35

HCF=1

Product of two numbers = LCM x HCF LCM = 35

17.

Explanation:

1 1 1: : : : 30

2 3 5

1 1 130: 30: 30 15:10:6

2 3 5

x y z LCM

18.

Explanation: Ans: D The series is cabbac / cabbac / cabbac. Thus, the pattern cabbac is repeated.

19.

Explanation: D

20.

Explanation: D

35 125 5 3x x

21.

Explanation: Ans: A 3 11 25 11 33

2 5 44 5 15

Step I: 25 11 5

44 5 4

Step II: 3 11 4 15 6 1

12 5 5 33 5 5

22.

Explanation: Ans: A

Volume 316 14 7 1568l b h m

Surface Area

2

2 2 16 14 14 7 7 16

2 224 98 112 2 434 868

lb bh hl

cm

23.

Ans: B.

24.

Explanation:

3 9 2

4 3 16 18 4

16 18 4 50

4 16 4

P P

P P

P

P P

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